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WO2017199640A1 - Display device for vehicle and display system for vehicle - Google Patents

Display device for vehicle and display system for vehicle Download PDF

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Publication number
WO2017199640A1
WO2017199640A1 PCT/JP2017/014718 JP2017014718W WO2017199640A1 WO 2017199640 A1 WO2017199640 A1 WO 2017199640A1 JP 2017014718 W JP2017014718 W JP 2017014718W WO 2017199640 A1 WO2017199640 A1 WO 2017199640A1
Authority
WO
WIPO (PCT)
Prior art keywords
mirror
display
concave mirror
vehicle
optical axis
Prior art date
Application number
PCT/JP2017/014718
Other languages
French (fr)
Japanese (ja)
Inventor
祐樹 和田
Original Assignee
株式会社Ｊｖｃケンウッド
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2017037132A external-priority patent/JP2017210229A/en
Application filed by 株式会社Ｊｖｃケンウッド filed Critical 株式会社Ｊｖｃケンウッド
Publication of WO2017199640A1 publication Critical patent/WO2017199640A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R1/00—Optical viewing arrangements; Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
    • B60R1/20—Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
    • B60R1/22—Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles for viewing an area outside the vehicle, e.g. the exterior of the vehicle
    • B60R1/23—Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles for viewing an area outside the vehicle, e.g. the exterior of the vehicle with a predetermined field of view
    • B60R1/26—Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles for viewing an area outside the vehicle, e.g. the exterior of the vehicle with a predetermined field of view to the rear of the vehicle
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays

Definitions

  • the present invention relates to a vehicle display device and a vehicle display system.
  • a technology related to so-called electronic mirrors that display images from a camera that captures the rear of the vehicle and make it visible to the vehicle occupant instead of the conventional optical room mirror that reflects the field of view behind the vehicle and makes the vehicle visible to the vehicle occupant Is known (see, for example, Patent Document 1).
  • This technology includes a monitor that displays an image, and a mirror (concave mirror) that reflects the monitor image and displays the reflected image to the passenger.
  • the concave mirror is installed at a position where a conventional optical room mirror is attached.
  • the occupant When the occupant uses an electronic mirror, the occupant directly views the image displayed on the display at a short distance of about 50 cm.
  • the occupant moves the viewpoint between the front of the vehicle and the rear of the vehicle via the electronic mirror, the movement distance of the occupant's focal point increases, and the burden on the occupant's eyes may increase.
  • it may be difficult to focus on a short distance.
  • crew may feel uncomfortable and may feel a burden. Therefore, it is desired to facilitate the rearward visual recognition.
  • the present invention has been made in view of the above, and an object of the present invention is to facilitate rearward visual recognition.
  • the present invention provides a display for displaying an image, a reflection unit for reflecting the image displayed on the display, and the reflection reflected by the reflection unit.
  • a concave mirror that reflects an image, wherein the reflecting portion transmits the image reflected by the concave mirror, and the concave mirror has a center of curvature on an optical axis between the display and a viewpoint of a vehicle occupant. It is arranged.
  • a vehicle display system includes the above-described vehicle display device, a rear camera that captures the rear of the vehicle, and a control device that acquires an image captured by the rear camera and causes the display to display the image. Prepare.
  • FIG. 1 is a schematic diagram illustrating a configuration example of a vehicle display device according to the first embodiment.
  • FIG. 2 is a schematic diagram illustrating a configuration example of the vehicle display device according to the first embodiment.
  • FIG. 3 is a perspective view illustrating a configuration example of the vehicle display device according to the first embodiment.
  • FIG. 4A is a schematic diagram illustrating a configuration example of the vehicle display device according to the first embodiment.
  • FIG. 4B is a schematic diagram illustrating a configuration example of the vehicle display device according to the first embodiment.
  • FIG. 5 is a schematic diagram illustrating a configuration example of the vehicle display device according to the second embodiment.
  • FIG. 6 is a schematic diagram illustrating a configuration example of the vehicular display device according to the third embodiment.
  • FIG. 1 is a schematic diagram illustrating a configuration example of a vehicle display device according to the first embodiment.
  • FIG. 2 is a schematic diagram illustrating a configuration example of the vehicle display device according to the first embodiment.
  • FIG. 3 is a
  • FIG. 7 is a schematic diagram illustrating a configuration example of the vehicle display device according to the fourth embodiment.
  • FIG. 8 is a schematic diagram illustrating a configuration example of the vehicle display device according to the fifth embodiment.
  • FIG. 9 is a schematic diagram illustrating a configuration example of the vehicle display device according to the sixth embodiment.
  • FIG. 10 is a schematic diagram illustrating a configuration example of the vehicle display device according to the seventh embodiment.
  • FIG. 11 is a schematic diagram illustrating a configuration example of the vehicle display device according to the eighth embodiment.
  • FIG. 12 is a schematic diagram illustrating a configuration example of a vehicle display device according to another embodiment.
  • the front-rear direction is the traveling direction when the vehicle is traveling straight, and the front side in the traveling direction is “front” in the front-rear direction and the rear side is “rear” in the front-rear direction.
  • the front-rear direction is the X-axis direction.
  • the left-right direction is a direction that is horizontally orthogonal to the front-rear direction. In the front-rear direction “front” side, the left hand side is “left” and the right hand side is “right”.
  • the left-right direction is the Y-axis direction.
  • the vertical direction is a direction orthogonal to the front-rear direction and the left-right direction.
  • the vertical direction is the Z-axis direction.
  • front-rear direction, the left-right direction, and the up-down direction are orthogonal in three dimensions.
  • front and rear, left and right, and top and bottom are front and rear, left and right, and top and bottom when the vehicle display system 1 is mounted on a vehicle.
  • FIG. 1 is a schematic diagram illustrating a configuration example of a vehicle display device according to the first embodiment.
  • FIG. 2 is a schematic diagram illustrating a configuration example of the vehicle display device according to the first embodiment.
  • FIG. 3 is a perspective view illustrating a configuration example of the vehicle display device according to the first embodiment.
  • FIG. 4A is a schematic diagram illustrating a configuration example of the vehicle display device according to the first embodiment.
  • FIG. 4B is a schematic diagram illustrating a configuration example of the vehicle display device according to the first embodiment.
  • the vehicle display system 1 is a so-called electronic room mirror.
  • the vehicle display system 1 includes a rear camera 2, a control device 3, and a vehicle display device 4.
  • the rear camera 2 is arranged behind the vehicle and photographs the rear of the vehicle.
  • the rear camera 2 captures a range including a confirmation range by the vehicle display device 4.
  • the rear camera 2 normally takes a picture including a range not displayed on the vehicle display device 4.
  • the rear camera 2 has a horizontal field angle of, for example, 30 to 60 °, and a vertical field angle of, for example, 5 to 20 °.
  • the rear camera 2 outputs the captured video data to the video acquisition unit 31 of the control device 3.
  • the control device 3 is an arithmetic processing device configured with, for example, a CPU (Central Processing Unit).
  • the control device 3 executes instructions included in a program stored in a storage unit (not shown).
  • the control device 3 includes a video acquisition unit 31 and a display control unit 32.
  • the image acquisition unit 31 acquires an image of the rear of the vehicle.
  • the captured video data acquired by the video acquisition unit 31 is, for example, video data in which images of 60 frames per second are continuous.
  • the video acquisition unit 31 acquires captured video data output from the rear camera 2.
  • the video acquisition unit 31 cuts out a range to be displayed on the vehicle display device 4 from the captured video data. Which range of the captured video data is to be cut is stored in the storage unit in advance.
  • the range to be cut out includes a range that the occupant visually recognizes with a conventional optical rearview mirror.
  • the cut-out range includes a range that can be seen when the occupant moves his head and views the concave mirror 43 of the vehicle display device 4 at different angles with both eyes.
  • the video acquisition unit 31 outputs the extracted video data to the display control unit 32 as a video signal.
  • the display control unit 32 causes the vehicle display device 4 to display the video signal output from the video acquisition unit 31.
  • the vehicle display device 4 makes the occupant visually recognize the rear of the vehicle.
  • the vehicle display device 4 includes a display (display device) 41, a half mirror (reflecting portion) 42, a concave mirror 43, and a housing 40 that accommodates these.
  • the vehicular display device 4 has a virtual image distance of 2 m, for example.
  • the display (display device) 41 displays a video behind the vehicle based on the video signal output from the display control unit 32.
  • the display 41 includes, for example, a liquid crystal display (LCD: Liquid Crystal Display) or an organic EL (Organic Electro-Luminescence) display.
  • the display 41 is disposed at a position that is easily visible from the passenger.
  • the display 41 has a flat display surface 41a.
  • the display surface 41a is formed in a rectangular shape that is long in the left-right direction. In the present embodiment, the display surface 41a has a left-right width of the effective area of, for example, 180 mm and a vertical width of, for example, 45 mm.
  • the display surface 41a faces upward.
  • the optical axis A1 of the display 41 extends in the direction perpendicular to the display surface 41a from the center of the display surface 41a.
  • the optical axis A1 of the display 41 is disposed so as to pass through the half mirror 42.
  • the display surface 41 a of the display 41 is disposed so as to face the surface 42 a of the half mirror 42.
  • the light emitted from the display 41 on which the image is displayed enters the half mirror 42.
  • the optical axis A1 of the display 41 is arranged in parallel along the vertical direction.
  • the half mirror (reflecting part) 42 has a transmittance of incident light of 50%. In other words, the half mirror 42 transmits 50% of incident light and reflects the remaining 50%.
  • the half mirror 42 reflects the image displayed on the display 41 toward the concave mirror 43. In other words, the half mirror 42 reflects the light emitted from the display 41 toward the concave mirror 43.
  • the half mirror 42 transmits the light reflected by the concave mirror 43.
  • the half mirror 42 is disposed on the optical axis A 1 of the display 41 and on the optical axis A 2 of the concave mirror 43. In other words, the optical axis A1 of the display 41 and the optical axis A2 of the concave mirror 43 are orthogonal to each other on the half mirror 42.
  • the half mirror 42 is formed in a planar shape.
  • the half mirror 42 has a horizontal width of, for example, 250 mm and a vertical width of, for example, 85 mm.
  • the half mirror 42 is disposed above the display 41.
  • the surface 42 a of the half mirror 42 is disposed to face the display surface 41 a of the display 41.
  • the surface 42 a of the half mirror 42 is disposed to face the surface 43 a of the concave mirror 43.
  • the half mirror 42 is disposed at an angle ⁇ 1 with respect to the optical axis A1 of the display 41.
  • the half mirror 42 is disposed at an angle ⁇ 1 from the top to the bottom as it goes from the front to the rear. In the present embodiment, the angle ⁇ 1 is 45 °. In FIG.
  • the half mirror 42 is disposed with an inclination of 45 ° with respect to the vertical direction.
  • the half mirror 42 is disposed at a distance of 350 mm, for example, from the viewpoint of the passenger.
  • the distance from the passenger's viewpoint to the surface 43a of the concave mirror 43 is 485 mm.
  • the concave mirror 43 reflects the light reflected by the half mirror 42.
  • the concave mirror 43 has a radius of curvature of, for example, 420 mm.
  • the concave mirror 43 is curved forward in a concave shape.
  • the concave mirror 43 is disposed in front of the half mirror 42.
  • the surface 43a of the concave mirror 43 is arranged to face the surface 42a of the half mirror 42.
  • the optical axis A2 of the concave mirror 43 is orthogonal to the optical axis A1 of the display 41 on the half mirror.
  • the center of curvature of the concave mirror 43 is disposed on the optical axis between the display 41 and the viewpoint of the vehicle occupant.
  • the center of curvature of the concave mirror 43 is disposed on the optical axis A2 between the display 41 and the occupant's viewpoint.
  • the optical axis A2 of the concave mirror 43 is arranged in parallel along the horizontal direction.
  • the length of the optical axis A2 between the surface 43a of the concave mirror 43 and the surface 42a of the half mirror 42 is the same as that of the optical axis A1 between the display surface 41a of the display 41 and the surface 42a of the half mirror 42. Longer than length.
  • the housing 40 is formed in a box shape having an opening 40a.
  • the housing 40 is erected perpendicularly to the side wall 40b, the side wall 40c standing upright with respect to the side wall 40b, the side wall 40d standing upright with respect to the side wall 40c, and the side wall 40b.
  • Side wall 40e and side wall 40f arranged orthogonal to side wall 40d.
  • the opening 40a is formed between the side wall 40f and the side wall 40e.
  • a display 41, a half mirror 42, and a concave mirror 43 are integrally assembled in an internal space.
  • a display 41 is disposed at the rear of the side wall 40b.
  • a concave mirror 43 is disposed above the side wall 40d.
  • the opening 40 a is covered with a half mirror 42.
  • the casing 40 has a width W11 in the front-rear direction of 185.2 mm and a width W12 in the vertical direction of 108 mm.
  • the housing 40 configured in this way is attached to the
  • the case 40 can be adjusted in the vertical direction by an angle adjusting unit (not shown).
  • the angle adjustment of the housing 40 by the angle adjusting unit will be described with reference to FIGS. 4A and 4B.
  • the half mirror 42 is disposed at a position where the occupant looks up.
  • the housing 40 is positioned at the first predetermined position or the second predetermined position by adjusting the angle by the angle adjusting unit. More specifically, the housing 40 has a first predetermined position where the half mirror 42 is inclined with respect to the vertical direction as shown in FIG. As shown in FIG. 4B, the second predetermined position at which the half mirror 42 is arranged substantially in parallel along the vertical direction can be switched.
  • the housing 40 is positioned at the first predetermined position shown in FIG.
  • the half mirror 42 reflects the light incident from the display surface 41 a of the display 41 toward the concave mirror 43. At this time, the vehicle display system 1 functions as an electronic mirror.
  • the half mirror 42 reflects the field of view behind the vehicle as an optical mirror. At this time, the vehicle display system 1 functions as a conventional optical room mirror.
  • the housing 40 is positioned at the first predetermined position.
  • the rear camera 2 outputs the captured video data behind the vehicle to the video acquisition unit 31 of the control device 3.
  • the video acquisition unit 31 acquires video data from the rear camera 2 and outputs the video data to the display control unit 32.
  • the display control unit 32 outputs the video data as a video signal to the display 41 of the vehicle display device 4.
  • the display 41 displays a video behind the vehicle on the display surface 41a based on the video signal.
  • the display 41 on which the video is displayed emits light.
  • the emitted light is incident on the half mirror 42.
  • the incident light is reflected by the half mirror 42 toward the concave mirror 43.
  • the reflected light is incident on the concave mirror 43.
  • the incident light is reflected by the concave mirror 43 toward the half mirror 42.
  • the reflected light is incident on the half mirror 42.
  • the light reflected by the concave mirror 43 is substantially parallel light.
  • the incident light passes through the half mirror 42 and reaches the occupant.
  • the housing 40 is positioned at the second predetermined position.
  • the display 41 is turned off.
  • the half mirror 42 reflects the field of view behind the vehicle, similar to a conventional optical room mirror.
  • the light emitted from the display 41 on which the image is displayed is made substantially parallel by the optical path constituted by the display 41, the half mirror 42, and the concave mirror 43, and the occupant's viewpoint To reach.
  • the virtual image is displayed farther from the actual distance of the optical path formed by the display 41, the half mirror 42, and the concave mirror 43.
  • the amount of movement of the line of sight is suppressed even when the occupant moves the viewpoint between the front of the vehicle and the rear of the vehicle via the electronic mirror. According to this embodiment, since it is easy to focus, the time required for focusing can be reduced.
  • the virtual image is displayed farther than the actual distance of the optical path, even the occupant who is difficult to focus on the short distance can easily visually recognize the rear. As described above, according to the present embodiment, it is possible to facilitate rearward visual recognition.
  • the viewpoint is adjusted to an object distance of several meters to several hundred meters. Therefore, even if the occupant moves the viewpoint between the front of the vehicle and the rear of the vehicle via a conventional optical rearview mirror, the amount of line-of-sight movement is small and the rear can be confirmed instantaneously. According to the present embodiment, the burden on the passenger's eyes can be suppressed as in the case where a conventional optical rearview mirror is used.
  • the center of curvature of the concave mirror 43 is arranged on the optical axis A2 between the display 41 and the occupant's viewpoint, so that the incident light on the concave mirror 43 is relative to the center of curvature of the concave mirror 43. Incident vertically.
  • the concave mirror 43 has a simple configuration such as a spherical surface or a paraboloid, the distortion of the image increases or the distortion changes depending on the viewing angle, resulting in dizziness. Can be suppressed.
  • this embodiment can make the concave mirror 43 a simple structure.
  • the size of the display 41 can be reduced.
  • the range that is visible when the occupant moves his head and visually recognizes the concave mirror 43 of the vehicle display device 4 at different angles is cut out and displayed on the display 41. And since the display 41 is visually recognized with both eyes via the half mirror 42, the angle of view equivalent to the angle of view of the conventional optical rearview mirror in binocular vision is visually recognized without increasing the size of the concave mirror 43. be able to.
  • the rear side can be visually recognized in the same manner as a conventional optical rearview mirror.
  • the electronic room mirror and the conventional optical room mirror can be switched and used by switching the housing 40 between the first predetermined position and the second predetermined position by the angle adjustment unit. .
  • FIG. 5 is a schematic diagram illustrating a configuration example of the vehicle display device according to the second embodiment.
  • the vehicle display system 1A has the same basic configuration as the vehicle display system 1 of the first embodiment.
  • the same components as those of the vehicle display system 1 are denoted by the same reference numerals or corresponding reference numerals, and detailed description thereof is omitted.
  • the vehicle display device 4A of the vehicle display system 1A includes the polarizing plate (reflecting portion) 42A instead of the half mirror 42 and the point provided with the wavelength plate 44A. This is different from the vehicle display device 4 of the display system 1.
  • the polarizing plate 42A is a wire grid type polarizing plate.
  • the polarizing plate 42A transmits p-polarized light and reflects s-polarized light with respect to p-polarized light and s-polarized light that are two orthogonally polarized components.
  • the polarizing plate 42A reflects the light emitted from the display 41 toward the concave mirror 43.
  • the polarizing plate 42A transmits the light reflected by the concave mirror 43.
  • the polarizing plate 42A is formed in a planar shape.
  • the polarizing plate 42A is arranged in the same manner as the half mirror 42.
  • the wave plate 44A changes the state of incident polarized light by making a phase difference between p-polarized light and s-polarized light.
  • the wave plate 44A is a quarter wave plate.
  • the wave plate 44A gives a phase difference of ⁇ / 4 (90 °) to the p-polarized light and the s-polarized light.
  • the wave plate 44 ⁇ / b> A is affixed to the surface 43 a of the concave mirror 43.
  • the s-polarized light emitted from the display 41 enters the polarizing plate 42A.
  • the incident s-polarized light is reflected toward the concave mirror 43 by the polarizing plate 42A.
  • the s-polarized light reflected by the polarizing plate 42A enters the wave plate 44A.
  • the incident s-polarized light becomes circularly polarized light by the wave plate 44A.
  • the circularly polarized light is reflected by the concave mirror 43, enters the wave plate 44A again, and returns to linearly polarized light.
  • the light is reflected by the half mirror 42 toward the concave mirror 43, and further reflected by the concave mirror 43 toward the half mirror 42 and passes through the half mirror 42.
  • the half mirror 42 having a transmittance of 50% twice during reflection and transmission in the optical path to reach the occupant. For this reason, the light quantity is reduced to 1/4.
  • FIG. 6 is a schematic diagram illustrating a configuration example of the vehicular display device according to the third embodiment.
  • the vehicle display system 1B of the present embodiment is different from the vehicle display device 4 of the vehicle display system 1 of the first embodiment in the arrangement of optical elements constituting the vehicle display device 4B.
  • the vehicle display device 4B includes a display 41B, a half mirror 42B, a concave mirror 43B, and a housing 40B that accommodates these.
  • the display surface 41Ba faces rearward and upward.
  • the optical axis A1B of the display 41B is arranged with an angle ⁇ 2 inclined with respect to the vertical direction.
  • the angle ⁇ 2 is 20 °.
  • the half mirror 42B is disposed on the rear upper side with respect to the display 41B.
  • the surface 42Ba of the half mirror 42B is disposed to face the display surface 41Ba of the display 41B.
  • the half mirror 42B is disposed at an angle ⁇ 3 with respect to the optical axis A1B of the display 41B.
  • the half mirror 42 ⁇ / b> B is arranged with an angle ⁇ ⁇ b> 3 inclined downward from above as it goes from the front to the rear. In the present embodiment, the angle ⁇ 3 is 55 °.
  • the half mirror 42B is disposed on the optical axis A1B of the display 41B and on the optical axis A2B of the concave mirror 43B. In other words, the optical axis A1B of the display 41B and the optical axis A2B of the concave mirror 43B intersect on the half mirror 42B.
  • the arrangement of the half mirror 42B in FIG. 6 will be described.
  • the half mirror 42B is disposed with an inclination of 55 ° with respect to the horizontal direction.
  • the front end portion 42Bb of the half mirror 42B is disposed behind the front end portion 41Bb of the display 41B.
  • the rear end portion 42Bc of the half mirror 42B is disposed behind the rear end portion 41Bc of the display 41B.
  • the concave mirror 43B is disposed in front of the half mirror 42B.
  • the surface 43Ba of the concave mirror 43B is disposed to face the surface 42Ba of the half mirror 42B.
  • the optical axis A2B of the concave mirror 43B intersects the optical axis A1B of the display 41B on the half mirror 42B.
  • the angle ⁇ 4 between the optical axis A2B of the concave mirror 43B and the optical axis A1B of the display 41B is 70 °.
  • the optical axis A2B of the concave mirror 43B is disposed in parallel along the horizontal direction.
  • the length of the optical axis A2B between the surface 43Ba of the concave mirror 43B and the surface 42Ba of the half mirror 42B is equal to the optical axis A1B between the display surface 41Ba of the display 41B and the surface 42Ba of the half mirror 42B. Shorter than length.
  • the housing 40B is formed in a box shape having an opening 40Ba.
  • the housing 40B includes a side wall 40Bb, a side wall 40Bc that is inclined and inclined with respect to the side wall 40Bb, a side wall 40Bd that is erected perpendicular to the side wall 40Bc, and a side wall that is erected perpendicular to the side wall 40Bb.
  • 40Be The opening 40Ba is formed between the side wall 40Bd and the side wall 40Be.
  • a display 41B is disposed on the side wall 40Bb.
  • a concave mirror 43B is disposed on the side wall 40Bc.
  • the opening 40Ba is covered with a half mirror 42B.
  • the casing 40B has a front-rear width W21 of 117.9 mm and a vertical width W22 of 168.46 mm.
  • the width W21 in the front-rear direction of the housing 40B is the same as that of the first embodiment. It can be made smaller than the width W11 of the housing 40 in the front-rear direction.
  • FIG. 7 is a schematic diagram illustrating a configuration example of the vehicle display device according to the fourth embodiment.
  • the vehicle display system 1C of the present embodiment is different from the vehicle display device 4 of the vehicle display system 1 of the first embodiment in that the vehicle display device 4C includes a total reflection mirror 44C.
  • the vehicle display device 4C includes a display 41C, a half mirror 42C, a concave mirror 43C, a total reflection mirror 44C, and a housing 40C that accommodates these.
  • the display surface 41Ca of the display 41C faces upward.
  • the optical axis A1C of the display 41C is disposed so as to pass through the half mirror 42C. In FIG. 7, the optical axis A1C of the display 41C is arranged in parallel along the vertical direction.
  • the half mirror 42C is disposed above the display 41C and behind the total reflection mirror 44C.
  • the surface 42Ca of the half mirror 42C is disposed to face the display surface 41Ca of the display 41C.
  • the surface 42Ca of the half mirror 42C is disposed to face the surface 44Ca of the total reflection mirror 44C.
  • the half mirror 42C is disposed at an angle ⁇ 5 with respect to the optical axis A1C of the display 41C.
  • the half mirror 42 ⁇ / b> C is disposed with an angle ⁇ ⁇ b> 5 inclined downward from above as it goes from the front to the rear. In the present embodiment, the angle ⁇ 5 is 45 °.
  • the optical axis A3C of the half mirror 42C is coaxial with the optical axis of the total reflection mirror 44C.
  • the half mirror 42C is disposed on the optical axis A1C of the display 41C.
  • the optical axis A1C of the display 41C and the optical axis A3C of the half mirror 42C are orthogonal to each other on the half mirror 42C.
  • the half mirror 42C is disposed with an inclination of 45 ° with respect to the horizontal direction.
  • the concave mirror 43C is disposed in front of the display 41C and below the total reflection mirror 44C.
  • the surface 43Ca of the concave mirror 43C is disposed to face the surface 44Ca of the total reflection mirror 44C.
  • the optical axis A2C of the concave mirror 43C is arranged in parallel with the optical axis A1C of the display 41C.
  • the optical axis A2C of the concave mirror 43C is orthogonal to the optical axis A3C of the total reflection mirror 44C on the total reflection mirror 44C. In FIG. 7, the optical axis A2C of the concave mirror 43C is arranged in parallel along the vertical direction.
  • the total reflection mirror 44C has a transmittance of incident light of 0%. In other words, the total reflection mirror 44C totally reflects incident light.
  • the total reflection mirror 44C reflects the light reflected by the half mirror 42C toward the concave mirror 43C.
  • the total reflection mirror 44C reflects the light reflected by the concave mirror 43C toward the half mirror 42C.
  • the total reflection mirror 44C is formed in a planar shape.
  • the total reflection mirror 44C is disposed in front of the half mirror 42C and above the concave mirror 43C.
  • the surface 44Ca of the total reflection mirror 44C is disposed to face the surface 42Ca of the half mirror 42C.
  • the surface 44Ca of the total reflection mirror 44C is disposed to face the surface 43Ca of the concave mirror 43C.
  • the total reflection mirror 44C is disposed at an angle ⁇ 6 with respect to the optical axis A2C of the concave mirror 43C.
  • the total reflection mirror 44 ⁇ / b> C is disposed so as to incline at an angle ⁇ ⁇ b> 6 from the bottom to the top as it goes from the front to the rear.
  • the angle ⁇ 6 is 45 °.
  • the total reflection mirror 44C is disposed with an inclination of 45 ° with respect to the horizontal direction.
  • the housing 40C is formed in a box shape having an opening 40Ca.
  • the housing 40C includes a side wall 40Cb, a side wall 40Cc erected perpendicular to the side wall 40Cb, a side wall 40Cd, and a side wall 40Ce erected perpendicular to the side wall 40Cc.
  • the opening 40Ca is formed between the side wall 40Cd and the side wall 40Ce.
  • a display 41C and a concave mirror 43C are disposed on the side wall 40Cb.
  • a total reflection mirror 44C is disposed between the side wall 40Cc and the side wall 40Ce.
  • the opening 40Ca is covered with a half mirror 42C.
  • the casing 40C has a width W31 in the front-rear direction of 152.45 mm and a width W32 in the up-down direction of 109 mm.
  • light emitted from the display 41C enters the half mirror 42C.
  • the incident light is reflected by the half mirror 42C toward the total reflection mirror 44C.
  • the reflected light enters the total reflection mirror 44C.
  • the incident light is reflected by the total reflection mirror 44C toward the concave mirror 43C.
  • the reflected light enters the concave mirror 43C.
  • the incident light is reflected by the concave mirror 43C toward the total reflection mirror 44C.
  • the light reflected by the concave mirror 43C is substantially parallel light.
  • the reflected light enters the total reflection mirror 44C.
  • the incident light is reflected by the total reflection mirror 44C toward the half mirror 42C.
  • the reflected light is incident on the half mirror 42C. Then, the light passes through the half mirror 42C and reaches the occupant.
  • the width W32 in the vertical direction of the housing 40C can be increased.
  • the width W31 in the front-rear direction can be made smaller than the width W11 in the front-rear direction of the casing 40 of the first embodiment without substantially changing the width W12 in the vertical direction of the casing 40 of the first embodiment.
  • FIG. 8 is a schematic diagram illustrating a configuration example of the vehicle display device according to the fifth embodiment.
  • the vehicle display system 1D of the present embodiment differs from the vehicle display device 4C of the vehicle display system 1C of the fourth embodiment in the arrangement of optical elements constituting the vehicle display device 4D.
  • the vehicle display device 4D includes a display 41D, a half mirror 42D, a concave mirror 43D, a total reflection mirror 44D, and a housing 40D that accommodates these.
  • Display 41D has display surface 41Da facing backward.
  • the optical axis A1D of the display 41D is disposed so as to pass through the total reflection mirror 44D.
  • the display 41D has an optical axis A1D arranged in parallel along the horizontal direction.
  • the half mirror 42D is disposed rearward and upward with respect to the display 41D and rearward with respect to the concave mirror 43D.
  • the surface 42Da of the half mirror 42D is disposed to face the surface 43Da of the concave mirror 43D.
  • the surface 42Da of the half mirror 42D is disposed to face the surface 44Da of the total reflection mirror 44D.
  • the half mirror 42D is disposed at an angle ⁇ 7 with respect to the optical axis A2D of the concave mirror 43D.
  • the half mirror 42D is disposed so as to be inclined at an angle ⁇ 7 from above to below as it goes from the front to the rear. In the present embodiment, the angle ⁇ 7 is 45 °.
  • the optical axis A3D of the half mirror 42D is coaxial with the optical axis of the total reflection mirror 44D.
  • the half mirror 42D is disposed on the optical axis A2D of the concave mirror 43D.
  • the optical axis A2D of the concave mirror 43D and the optical axis A3D of the half mirror 42D are orthogonal to each other on the half mirror 42D.
  • the half mirror 42D is disposed with an inclination of 45 ° with respect to the horizontal direction.
  • the concave mirror 43D is arranged above the display 41D and ahead of the half mirror 42D.
  • the surface 43Da of the concave mirror 43D is disposed to face the surface 42Da of the half mirror 42D.
  • the optical axis A2D of the concave mirror 43D is arranged in parallel with the optical axis A1D of the display 41D.
  • the optical axis A2D of the concave mirror 43D is orthogonal to the optical axis A3D of the total reflection mirror 44D. In FIG. 8, the optical axis A2D of the concave mirror 43D is arranged in parallel along the horizontal direction.
  • the total reflection mirror 44D reflects the light emitted from the display 41D toward the half mirror 42D.
  • the total reflection mirror 44D is disposed behind the display 41D and below the half mirror 42D.
  • the surface 44Da of the total reflection mirror 44D is disposed to face the display surface 41Da of the display 41D.
  • the surface 44Da of the total reflection mirror 44D is disposed to face the surface 42Da of the half mirror 42D.
  • the total reflection mirror 44D is disposed at an angle ⁇ 8 with respect to the optical axis A1D of the display 41D.
  • the total reflection mirror 44D is disposed so as to be inclined at an angle ⁇ 8 from the bottom to the top as it goes from the front to the rear. In the present embodiment, the angle ⁇ 8 is 45 °.
  • the optical axis A3D of the total reflection mirror 44D and the optical axis A1D of the display 41D are orthogonal to each other on the total reflection mirror 44D.
  • the total reflection mirror 44D is disposed with an inclination of 45 ° with respect to the horizontal direction.
  • the housing 40D is formed in a box shape having an opening 40Da.
  • the housing 40D includes a side wall 40Db, a side wall 40Dc erected perpendicular to the side wall 40Db, a side wall 40Dd erected perpendicular to the side wall 40Dc, and a side wall inclined to the side wall 40Db. 40De.
  • the opening 40Da is formed between the side wall 40Dd and the side wall 40De.
  • a display 41D and a concave mirror 43D are vertically arranged on the side wall 40Dc.
  • a total reflection mirror 44D is disposed on the side wall 40De.
  • the opening 40Da is covered with a half mirror 42D.
  • the housing 40D has a width W41 in the front-rear direction of 113.75 mm and a width W42 in the up-down direction of 139 mm.
  • light emitted from the display 41D is incident on the total reflection mirror 44D.
  • the incident light is reflected by the total reflection mirror 44D toward the half mirror 42D.
  • the reflected light is incident on the half mirror 42D.
  • the incident light is reflected by the half mirror 42D toward the concave mirror 43D.
  • the reflected light injects into the concave mirror 43D.
  • the incident light is reflected by the concave mirror 43D toward the half mirror 42D.
  • the light reflected by the concave mirror 43D is substantially parallel light.
  • the reflected light is incident on the half mirror 42D.
  • the light passes through the half mirror 42D and reaches the occupant.
  • the width W41 in the front-rear direction of the housing 40D and The vertical width W42 can be made smaller than the front-rear width W11 and the vertical width W12 of the housing 40 of the first embodiment.
  • FIG. 9 is a schematic diagram illustrating a configuration example of the vehicle display device according to the sixth embodiment.
  • the vehicle display system 1E of the present embodiment is different from the vehicle display device 4D of the vehicle display system 1D of the fifth embodiment in the arrangement of optical elements constituting the vehicle display device 4E.
  • the vehicle display device 4E includes a display 41E, a half mirror 42E, a concave mirror 43E, a total reflection mirror 44E, and a housing 40E that accommodates these.
  • the display surface 41Ea of the display 41E is directed downward and rearward.
  • the optical axis A1E of the display 41E is disposed so as to pass through the total reflection mirror 44E.
  • the display 41E is arranged such that the optical axis A1E is inclined at an angle ⁇ 9 with respect to the horizontal direction. In the present embodiment, the angle ⁇ 9 is 25 °.
  • the display 41E is disposed on the front lower side with respect to the concave mirror 43E.
  • the half mirror 42E is disposed rearward and upward with respect to the display 41E and behind the concave mirror 43E.
  • the surface 42Ea of the half mirror 42E is disposed to face the surface 43Ea of the concave mirror 43E.
  • the surface 42Ea of the half mirror 42E is disposed to face the surface 44Ea of the total reflection mirror 44E.
  • the half mirror 42E is disposed at an angle of ⁇ 10 with respect to the optical axis A2E of the concave mirror 43E.
  • the half mirror 42E is disposed so as to be inclined at an angle ⁇ 10 from the top to the bottom as it goes from the front to the rear. In the present embodiment, the angle ⁇ 10 is 52.5 °.
  • the optical axis A3E of the half mirror 42E is coaxial with the optical axis of the total reflection mirror 44E.
  • the half mirror 42E is disposed on the optical axis A2E of the concave mirror 43E.
  • the optical axis A2E of the concave mirror 43E and the optical axis A3E of the half mirror 42E intersect on the half mirror 42E.
  • the half mirror 42E is disposed at an angle of 52.5 ° with respect to the horizontal direction.
  • the concave mirror 43E is disposed rearward and upward with respect to the display 41E and forward with respect to the half mirror 42E.
  • the surface 43Ea of the concave mirror 43E is disposed to face the surface 42Ea of the half mirror 42E.
  • the optical axis A2E of the concave mirror 43E is arranged to be inclined with respect to the optical axis A1E of the display 41E.
  • the optical axis A2E of the concave mirror 43E intersects the optical axis A3E of the half mirror 42E on the half mirror 42E. In FIG. 9, the optical axis A2E of the concave mirror 43E is arranged in parallel along the horizontal direction.
  • the total reflection mirror 44E is disposed rearward and downward with respect to the display 41E and downward with respect to the half mirror 42E.
  • the surface 44Ea of the total reflection mirror 44E is disposed to face the display surface 41Ea of the display 41E.
  • the surface 44Ea of the total reflection mirror 44E is disposed to face the surface 42Ea of the half mirror 42E.
  • the total reflection mirror 44E is disposed at an angle ⁇ 11 with respect to the optical axis A1E of the display 41E. In the present embodiment, the angle ⁇ 11 is 50 °.
  • the total reflection mirror 44E is disposed so as to be inclined at an angle ⁇ 11 from the bottom to the top as it goes from the front to the rear. In FIG. 9, the total reflection mirror 44E is disposed with an inclination of 25 ° with respect to the horizontal direction.
  • the housing 40E is formed in a box shape having an opening 40Ea.
  • the housing 40E is inclined with respect to the side wall 40Eb, the side wall 40Ec that is inclined to the side wall 40Eb, the side wall 40Ed, the side wall 40Ee that is orthogonal to the side wall 40Ec, and the side wall 40Ee, A side wall 40Ef disposed along a direction parallel to the side wall 40Eb, a side wall 40Eg erected perpendicular to the side wall 40Ef, and a side wall disposed perpendicular to the side wall 40Eg and parallel to the side wall 40Eb 40Eh, and a side wall 40Ei that stands upright with respect to the side wall 40Ed.
  • the opening 40Ea is formed between the side wall 40Eh and the side wall 40Ei.
  • a display 41E is disposed on the side wall 40Ee.
  • the concave mirror 43E is fixed by a U-shaped fixing portion 46E disposed on the inner peripheral surfaces of the side wall 40Eg and the side wall 40Eh.
  • a total reflection mirror 44E is disposed on the side wall 40Ed.
  • the opening 40Ea is covered with a half mirror 42E.
  • the casing 40E has a width W51 in the front-rear direction of 142.95 mm and a width W52 in the vertical direction of 127 mm.
  • the width W52 in the vertical direction of the housing 40E is increased. It can be made smaller than the vertical width W42 of the housing 40D of the fifth embodiment.
  • FIG. 10 is a schematic diagram illustrating a configuration example of the vehicle display device according to the seventh embodiment.
  • the vehicle display system 1F of the present embodiment is different from the vehicle display device 4 of the vehicle display system 1 of the first embodiment in that the vehicle display device 4F includes a cover glass 45F.
  • the virtual image distance of the vehicle display device 4F is set to 1 m, for example.
  • the vehicle display device 4F includes a display 41F, a half mirror 42F, a concave mirror 43F, a cover glass 45F, and a housing 40F that accommodates these.
  • the configurations of the display 41F, the half mirror 42F, and the concave mirror 43F are the same as the display 41, the half mirror 42, and the concave mirror 43 of the first embodiment.
  • the cover glass 45F is disposed so as to cover the opening 40Fa of the rectangular parallelepiped housing 40F.
  • the cover glass 45F is disposed between the half mirror 42F and the occupant.
  • the cover glass 45F transmits the light transmitted through the half mirror 42F.
  • the housing 40F is formed in a rectangular parallelepiped box shape having an opening 40Fa.
  • the housing 40F is provided with antireflection by, for example, coloring the inside black to prevent the surrounding reflection.
  • the cover glass 45F is disposed so as to cover the opening 40Fa of the housing 40F.
  • FIG. 11 is a schematic diagram illustrating a configuration example of the vehicle display device according to the eighth embodiment.
  • the vehicle display system 1H of the present embodiment is different from the vehicle display device 4D of the vehicle display system 1D of the fifth embodiment in the arrangement of optical elements constituting the vehicle display device 4H.
  • the vehicle display device 4H includes a display 41H, a polarizing beam splitter (reflecting unit) 42H, a concave mirror 43H, a total reflection mirror 44H, a wave plate 47H, a wave plate 48H, and a housing 40H that accommodates these. Have.
  • the display surface 41Ha of the display 41H faces downward.
  • the optical axis A1H of the display 41H is arranged so as to pass through the polarization beam splitter 42H.
  • the display 41H has an optical axis A1H arranged in parallel along the vertical direction.
  • the light emitted from the display 41H is linearly polarized light. If the light emitted from the display 41H is non-polarized light, a polarizing plate may be disposed between the display 41H and the polarizing beam splitter 42H to extract linearly polarized light.
  • the polarizing beam splitter 42H is disposed below the display 41H.
  • the polarization beam splitter 42H transmits s-polarized light and reflects p-polarized light with respect to p-polarized light and s-polarized light that are two orthogonally polarized components.
  • the polarization beam splitter 42H transmits the light emitted from the display 41H toward the total reflection mirror 44H.
  • the polarization beam splitter 42H reflects the light reflected by the total reflection mirror 44H toward the concave mirror 43H.
  • the polarization beam splitter 42H is formed in a planar shape.
  • the surface 42Ha of the polarization beam splitter 42H is arranged to face the surface 43Ha of the concave mirror 43H.
  • the surface 42Ha of the polarization beam splitter 42H is disposed to face the surface 44Ha of the total reflection mirror 44H.
  • the polarization beam splitter 42H is disposed at an angle of ⁇ 13 with respect to the optical axis A2H of the concave mirror 43H.
  • the polarization beam splitter 42H is arranged with an angle ⁇ 13 inclined from the top to the bottom as it goes from the front to the rear. In the present embodiment, the angle ⁇ 13 is 45 °.
  • the optical axis of the polarization beam splitter 42H is disposed on the optical axis A1H of the display 41H.
  • the polarization beam splitter 42H is disposed on the optical axis A2H of the concave mirror 43H.
  • the optical axis A2H of the concave mirror 43H and the optical axis A1H of the total reflection mirror 44H are orthogonal to each other on the polarization beam splitter 42H.
  • the polarization beam splitter 42H is disposed with an inclination of 45 ° with respect to the horizontal direction.
  • the concave mirror 43H is disposed below the display 41H and ahead of the polarization beam splitter 42H.
  • the surface 43Ha of the concave mirror 43H is disposed to face the surface 42Ha of the polarization beam splitter 42H.
  • the optical axis A2H of the concave mirror 43H is arranged orthogonal to the optical axis A1H of the display 41H. In FIG. 11, the optical axis A2H of the concave mirror 43H is arranged in parallel along the horizontal direction.
  • the total reflection mirror 44H reflects the light emitted from the display 41H and transmitted through the polarization beam splitter 42H toward the polarization beam splitter 42H.
  • the total reflection mirror 44H is disposed below the display 41H and below the polarization beam splitter 42H.
  • the surface 44Ha of the total reflection mirror 44H is arranged to face the display surface 41Ha of the display 41H.
  • the surface 44Ha of the total reflection mirror 44H is disposed so as to face the surface 42Ha of the polarization beam splitter 42H.
  • the optical axis of the total reflection mirror 44H is coaxial with the optical axis A1H of the display 41H.
  • the total reflection mirror 44H is arranged in parallel along the horizontal direction.
  • the wave plate 47H changes the state of incident polarized light by giving a phase difference between an electric field and a magnetic field for linearly polarized light.
  • the wave plate 47H is a quarter wave plate.
  • the wave plate 47H gives a phase difference of ⁇ / 4 (90 °) to the electric field and the magnetic field.
  • the wave plate 47H is affixed to the surface 43Ha of the concave mirror 43H.
  • the wave plate 48H changes the state of incident polarized light by making a phase difference between the electric field and the magnetic field.
  • the wave plate 48H is a quarter wave plate.
  • the wave plate 48H gives a phase difference of ⁇ / 4 (90 °) to the electric field and the magnetic field.
  • the wave plate 48H is affixed to the surface 44Ha of the total reflection mirror 44H.
  • the p-polarized light emitted from the display 41H is transmitted through the polarization beam splitter 42H.
  • the p-polarized light that has passed through the polarization beam splitter 42H enters the wave plate 48H.
  • the incident p-polarized light becomes circularly polarized light by the wave plate 48H.
  • the circularly polarized light is reflected by the total reflection mirror 44H, enters the wave plate 48H again, and returns to linearly polarized light.
  • the phase is changed to s-polarized light whose phase is rotated by 90 °.
  • the s-polarized light whose phase is rotated by 90 ° is reflected by the polarization beam splitter 42H and enters the wave plate 47H.
  • the incident s-polarized light becomes circularly polarized light by the wave plate 47H.
  • the circularly polarized light is reflected by the concave mirror 43H, enters the wave plate 47H again, and returns to linearly polarized light.
  • the phase is changed to p-polarized light whose phase is rotated by 90 °.
  • the p-polarized light whose phase is rotated by 90 ° passes through the polarization beam splitter 42H and reaches the occupant.
  • the housing 40H is formed in a box shape having an opening 40Ha.
  • the housing 40H includes a side wall 40Hb, a side wall 40Hc erected perpendicular to the side wall 40Hb, a side wall 40Hd arranged orthogonal to the side wall 40Hc, and a side wall 40He erected orthogonal to the side wall 40Hb.
  • the opening 40Ha is formed between the side wall 40Hd and the side wall 40He.
  • a total reflection mirror 44H is disposed on the side wall 40Hb.
  • a concave mirror 43H is disposed on the side wall 40Hc.
  • a display 41H is disposed on the side wall 40Hd.
  • the opening 40Ha is covered with a polarization beam splitter 42H.
  • the housing 40H has a front-rear width W61 of about 100 mm and a vertical width W62 of about 90 mm.
  • light emitted from the display 41H passes through the polarization beam splitter 42H and enters the total reflection mirror 44H.
  • the incident light is reflected by the total reflection mirror 44H toward the polarization beam splitter 42H.
  • the reflected light enters the polarization beam splitter 42H.
  • the incident light is reflected by the polarizing beam splitter 42H toward the concave mirror 43H.
  • the reflected light is incident on the concave mirror 43H.
  • the incident light is reflected by the concave mirror 43H toward the polarization beam splitter 42H.
  • the light reflected by the concave mirror 43H is substantially parallel light.
  • the reflected light enters the polarization beam splitter 42H. Then, the light passes through the polarization beam splitter 42H and reaches the occupant.
  • this embodiment can make the width W61 of the housing
  • FIG. 12 is a schematic diagram illustrating a configuration example of a vehicle display device according to another embodiment.
  • the virtual image distance is set to 1 m, for example.
  • the vehicle display device 4G includes a display 41G, a half mirror 42G, a concave mirror 43G, and a housing 40G that accommodates these.
  • the configuration of the display 41G, the half mirror 42G, and the concave mirror 43G is the same as the display 41, the half mirror 42, and the concave mirror 43 of the first embodiment.
  • the vehicle display device 4G can be arranged in the upper part of the passenger compartment in the same manner as a conventional optical room mirror.
  • the concave mirror 43 may be adjusted in the front-rear direction, and an adjustment unit that adjusts the optical path length (back focus) to the display 41 may be provided.
  • the size of the image displayed on the display 41 may be adjusted according to the position of the concave mirror 43.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Instrument Panels (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)

Abstract

Provided is a display (41) that displays an image captured behind a vehicle, a half-silvered mirror (42) that reflects the image displayed on the display (41), and a concave mirror (43) that reflects the image reflected by the half-silvered mirror (42). The half-silvered mirror (42) passes the image reflected by the concave mirror (43), and the concave mirror (43) has a center of curvature disposed on an optical axis (A2) between the display (41) and the viewpoint of the occupant of the vehicle.

Description

車両用表示装置および車両用表示システムVEHICLE DISPLAY DEVICE AND VEHICLE DISPLAY SYSTEM
　本発明は、車両用表示装置および車両用表示システムに関する。 The present invention relates to a vehicle display device and a vehicle display system.
　車両の後方の視界を反射して乗員に視認させる従来の光学式のルームミラーに代わって、車両の後方を撮影するカメラからの映像をディスプレイに表示し車両の乗員に視認させるいわゆる電子ミラーに関する技術が知られている（例えば、特許文献１参照）。この技術は、画像を映し出すモニターと、モニター画像を反射させて乗員へ反射画像を見せるミラー（凹面鏡）とを備える。凹面鏡は、従来の光学式のルームミラーが取り付けられる位置に設置されている。 A technology related to so-called electronic mirrors that display images from a camera that captures the rear of the vehicle and make it visible to the vehicle occupant instead of the conventional optical room mirror that reflects the field of view behind the vehicle and makes the vehicle visible to the vehicle occupant Is known (see, for example, Patent Document 1). This technology includes a monitor that displays an image, and a mirror (concave mirror) that reflects the monitor image and displays the reflected image to the passenger. The concave mirror is installed at a position where a conventional optical room mirror is attached.
特許第５２８６７５０号公報Japanese Patent No. 5286750
　乗員が電子ミラーを使用する場合、乗員は、ディスプレイに表示された映像を５０ｃｍ前後の近距離で直接視認する。車両の前方と電子ミラーを介して車両の後方とで乗員が視点を移動する際には、乗員の焦点の移動距離が大きくなり、乗員の目に対する負担が大きくなるおそれがある。乗員によっては、焦点を近距離に合わせることが困難な場合もある。このように、電子ミラーを使用する場合、乗員が違和感を覚え、負担を感じるおそれがある。そこで、後方の視認を容易にすることが望まれている。 When the occupant uses an electronic mirror, the occupant directly views the image displayed on the display at a short distance of about 50 cm. When the occupant moves the viewpoint between the front of the vehicle and the rear of the vehicle via the electronic mirror, the movement distance of the occupant's focal point increases, and the burden on the occupant's eyes may increase. Depending on the occupant, it may be difficult to focus on a short distance. Thus, when using an electronic mirror, a passenger | crew may feel uncomfortable and may feel a burden. Therefore, it is desired to facilitate the rearward visual recognition.
　本発明は、上記に鑑みてなされたものであって、後方の視認を容易にすることを目的とする。 The present invention has been made in view of the above, and an object of the present invention is to facilitate rearward visual recognition.
　上述した課題を解決し、目的を達成するために、本発明は、映像を表示する表示器と、前記表示器に表示された前記映像を反射させる反射部と、前記反射部で反射された前記映像を反射させる凹面鏡とを備え、前記反射部は、前記凹面鏡で反射された前記映像を透過し、前記凹面鏡は、曲率中心が前記表示器と車両の乗員の視点との間の光軸上に配置されていることを特徴とする。 In order to solve the above-described problems and achieve the object, the present invention provides a display for displaying an image, a reflection unit for reflecting the image displayed on the display, and the reflection reflected by the reflection unit. A concave mirror that reflects an image, wherein the reflecting portion transmits the image reflected by the concave mirror, and the concave mirror has a center of curvature on an optical axis between the display and a viewpoint of a vehicle occupant. It is arranged.
　本発明に係る車両用表示システムは、上記の車両用表示装置と、車両の後方を撮影する後方カメラと、前記後方カメラで撮影された映像を取得し、前記表示器に表示させる制御装置とを備える。 A vehicle display system according to the present invention includes the above-described vehicle display device, a rear camera that captures the rear of the vehicle, and a control device that acquires an image captured by the rear camera and causes the display to display the image. Prepare.
　本発明によれば、後方の視認を容易にすることができるという効果を奏する。 According to the present invention, there is an effect that rearward visual recognition can be facilitated.
図１は、第一実施形態に係る車両用表示装置の構成例を示す概略図である。FIG. 1 is a schematic diagram illustrating a configuration example of a vehicle display device according to the first embodiment. 図２は、第一実施形態に係る車両用表示装置の構成例を示す概略図である。FIG. 2 is a schematic diagram illustrating a configuration example of the vehicle display device according to the first embodiment. 図３は、第一実施形態に係る車両用表示装置の構成例を示す斜視図である。FIG. 3 is a perspective view illustrating a configuration example of the vehicle display device according to the first embodiment. 図４－１は、第一実施形態に係る車両用表示装置の構成例を示す概略図である。FIG. 4A is a schematic diagram illustrating a configuration example of the vehicle display device according to the first embodiment. 図４－２は、第一実施形態に係る車両用表示装置の構成例を示す概略図である。FIG. 4B is a schematic diagram illustrating a configuration example of the vehicle display device according to the first embodiment. 図５は、第二実施形態に係る車両用表示装置の構成例を示す概略図である。FIG. 5 is a schematic diagram illustrating a configuration example of the vehicle display device according to the second embodiment. 図６は、第三実施形態に係る車両用表示装置の構成例を示す概略図である。FIG. 6 is a schematic diagram illustrating a configuration example of the vehicular display device according to the third embodiment. 図７は、第四実施形態に係る車両用表示装置の構成例を示す概略図である。FIG. 7 is a schematic diagram illustrating a configuration example of the vehicle display device according to the fourth embodiment. 図８は、第五実施形態に係る車両用表示装置の構成例を示す概略図である。FIG. 8 is a schematic diagram illustrating a configuration example of the vehicle display device according to the fifth embodiment. 図９は、第六実施形態に係る車両用表示装置の構成例を示す概略図である。FIG. 9 is a schematic diagram illustrating a configuration example of the vehicle display device according to the sixth embodiment. 図１０は、第七実施形態に係る車両用表示装置の構成例を示す概略図である。FIG. 10 is a schematic diagram illustrating a configuration example of the vehicle display device according to the seventh embodiment. 図１１は、第八実施形態に係る車両用表示装置の構成例を示す概略図である。FIG. 11 is a schematic diagram illustrating a configuration example of the vehicle display device according to the eighth embodiment. 図１２は、他の実施形態に係る車両用表示装置の構成例を示す概略図である。FIG. 12 is a schematic diagram illustrating a configuration example of a vehicle display device according to another embodiment.
　以下に添付図面を参照して、本発明に係る車両用表示システム１の実施形態を詳細に説明する。なお、以下の実施形態により本発明が限定されるものではない。 Hereinafter, an embodiment of a display system 1 for a vehicle according to the present invention will be described in detail with reference to the accompanying drawings. In addition, this invention is not limited by the following embodiment.
　以下の説明においては、前後方向とは、車両直進時の進行方向であり、進行方向前方側を前後方向の「前」、後方側を前後方向の「後」とする。前後方向を、Ｘ軸方向とする。左右方向とは、前後方向に対して水平に直交する方向である。前後方向「前」側へ向かって、左手側が「左」、右手側が「右」である。左右方向を、Ｙ軸方向とする。上下方向とは、前後方向および左右方向に対して直交する方向である。上下方向を、Ｚ軸方向とする。したがって、前後方向、左右方向および上下方向は、３次元で直交する。以下の説明における前後、左右、上下は、車両用表示システム１を車両に搭載した状態での前後、左右、上下である。 In the following description, the front-rear direction is the traveling direction when the vehicle is traveling straight, and the front side in the traveling direction is “front” in the front-rear direction and the rear side is “rear” in the front-rear direction. The front-rear direction is the X-axis direction. The left-right direction is a direction that is horizontally orthogonal to the front-rear direction. In the front-rear direction “front” side, the left hand side is “left” and the right hand side is “right”. The left-right direction is the Y-axis direction. The vertical direction is a direction orthogonal to the front-rear direction and the left-right direction. The vertical direction is the Z-axis direction. Therefore, the front-rear direction, the left-right direction, and the up-down direction are orthogonal in three dimensions. In the following description, front and rear, left and right, and top and bottom are front and rear, left and right, and top and bottom when the vehicle display system 1 is mounted on a vehicle.
［第一実施形態］
　車両用表示システム１は、車両に搭載され、車両周辺を表示する。図１は、第一実施形態に係る車両用表示装置の構成例を示す概略図である。図２は、第一実施形態に係る車両用表示装置の構成例を示す概略図である。図３は、第一実施形態に係る車両用表示装置の構成例を示す斜視図である。図４－１は、第一実施形態に係る車両用表示装置の構成例を示す概略図である。図４－２は、第一実施形態に係る車両用表示装置の構成例を示す概略図である。 [First embodiment]
The vehicle display system 1 is mounted on a vehicle and displays the periphery of the vehicle. FIG. 1 is a schematic diagram illustrating a configuration example of a vehicle display device according to the first embodiment. FIG. 2 is a schematic diagram illustrating a configuration example of the vehicle display device according to the first embodiment. FIG. 3 is a perspective view illustrating a configuration example of the vehicle display device according to the first embodiment. FIG. 4A is a schematic diagram illustrating a configuration example of the vehicle display device according to the first embodiment. FIG. 4B is a schematic diagram illustrating a configuration example of the vehicle display device according to the first embodiment.
　図１ないし図３に示すように、車両用表示システム１は、いわゆる電子ルームミラーである。車両用表示システム１は、後方カメラ２と、制御装置３と、車両用表示装置４とを有する。 As shown in FIGS. 1 to 3, the vehicle display system 1 is a so-called electronic room mirror. The vehicle display system 1 includes a rear camera 2, a control device 3, and a vehicle display device 4.
　後方カメラ２は、車両の後方に配置され、車両の後方を撮影する。後方カメラ２は、車両用表示装置４による確認範囲を含んだ範囲を撮影する。後方カメラ２は、通常時、車両用表示装置４に表示されない範囲を含んで撮影している。後方カメラ２は、水平方向の画角が例えば３０～６０°、上下方向の画角が例えば５～２０°である。後方カメラ２は、撮影した撮影映像データを制御装置３の映像取得部３１へ出力する。 The rear camera 2 is arranged behind the vehicle and photographs the rear of the vehicle. The rear camera 2 captures a range including a confirmation range by the vehicle display device 4. The rear camera 2 normally takes a picture including a range not displayed on the vehicle display device 4. The rear camera 2 has a horizontal field angle of, for example, 30 to 60 °, and a vertical field angle of, for example, 5 to 20 °. The rear camera 2 outputs the captured video data to the video acquisition unit 31 of the control device 3.
　制御装置３は、例えば、ＣＰＵ（Ｃｅｎｔｒａｌ　Ｐｒｏｃｅｓｓｉｎｇ　Ｕｎｉｔ）などで構成された演算処理装置である。制御装置３は、図示しない記憶部に記憶されているプログラムに含まれる命令を実行する。制御装置３は、映像取得部３１と、表示制御部３２とを有する。 The control device 3 is an arithmetic processing device configured with, for example, a CPU (Central Processing Unit). The control device 3 executes instructions included in a program stored in a storage unit (not shown). The control device 3 includes a video acquisition unit 31 and a display control unit 32.
　映像取得部３１は、車両の後方を撮影した映像を取得する。映像取得部３１が取得する撮影映像データは、例えば、毎秒６０フレームの画像が連続した映像データである。本実施形態では、映像取得部３１は、後方カメラ２が出力した撮影映像データを取得する。映像取得部３１は、撮影映像データから、車両用表示装置４に表示させる範囲を切出す。撮影映像データのどの範囲を切出すかは、あらかじめ記憶部に記憶されている。切出す範囲は、従来の光学式のバックミラーで乗員が視認する範囲を含む。言い換えると、切出す範囲は、乗員が頭を動かして異なる角度で車両用表示装置４の凹面鏡４３を両眼視した際に見える範囲を含む。映像取得部３１は、切出した映像データを映像信号として表示制御部３２に出力する。 The image acquisition unit 31 acquires an image of the rear of the vehicle. The captured video data acquired by the video acquisition unit 31 is, for example, video data in which images of 60 frames per second are continuous. In the present embodiment, the video acquisition unit 31 acquires captured video data output from the rear camera 2. The video acquisition unit 31 cuts out a range to be displayed on the vehicle display device 4 from the captured video data. Which range of the captured video data is to be cut is stored in the storage unit in advance. The range to be cut out includes a range that the occupant visually recognizes with a conventional optical rearview mirror. In other words, the cut-out range includes a range that can be seen when the occupant moves his head and views the concave mirror 43 of the vehicle display device 4 at different angles with both eyes. The video acquisition unit 31 outputs the extracted video data to the display control unit 32 as a video signal.
　表示制御部３２は、映像取得部３１から出力された映像信号を車両用表示装置４に表示させる。 The display control unit 32 causes the vehicle display device 4 to display the video signal output from the video acquisition unit 31.
　車両用表示装置４は、車両の後方を乗員に視認させる。車両用表示装置４は、ディスプレイ（表示器）４１と、ハーフミラー（反射部）４２と、凹面鏡４３と、これらを収容する筐体４０とを有する。本実施形態では、車両用表示装置４は、虚像距離を例えば２ｍとする。 The vehicle display device 4 makes the occupant visually recognize the rear of the vehicle. The vehicle display device 4 includes a display (display device) 41, a half mirror (reflecting portion) 42, a concave mirror 43, and a housing 40 that accommodates these. In the present embodiment, the vehicular display device 4 has a virtual image distance of 2 m, for example.
　ディスプレイ（表示器）４１は、表示制御部３２から出力された映像信号に基づき、車両の後方の映像を表示する。ディスプレイ４１は、例えば、液晶ディスプレイ（ＬＣＤ：Ｌｉｑｕｉｄ　Ｃｒｙｓｔａｌ　Ｄｉｓｐｌａｙ）または有機ＥＬ（Ｏｒｇａｎｉｃ　Ｅｌｅｃｔｒｏ－Ｌｕｍｉｎｅｓｃｅｎｃｅ）ディスプレイなどを含む。ディスプレイ４１は、乗員から視認容易な位置に配置されている。ディスプレイ４１は、平面状の表示面４１ａを有する。表示面４１ａは、左右方向に長い矩形状に形成されている。本実施形態では、表示面４１ａは、有効エリアの左右方向の幅が例えば１８０ｍｍ、上下方向の幅が例えば４５ｍｍである。表示面４１ａは、上方に向いている。ディスプレイ４１の光軸Ａ１は、表示面４１ａの中央部から表示面４１ａと直交する方向に延びている。ディスプレイ４１の光軸Ａ１は、ハーフミラー４２を通るように配置されている。ディスプレイ４１の表示面４１ａは、ハーフミラー４２の表面４２ａと向かい合って配置されている。映像が表示されたディスプレイ４１から発せられた光は、ハーフミラー４２へ入射する。図２において、ディスプレイ４１の光軸Ａ１は、鉛直方向に沿って平行に配置されている。 The display (display device) 41 displays a video behind the vehicle based on the video signal output from the display control unit 32. The display 41 includes, for example, a liquid crystal display (LCD: Liquid Crystal Display) or an organic EL (Organic Electro-Luminescence) display. The display 41 is disposed at a position that is easily visible from the passenger. The display 41 has a flat display surface 41a. The display surface 41a is formed in a rectangular shape that is long in the left-right direction. In the present embodiment, the display surface 41a has a left-right width of the effective area of, for example, 180 mm and a vertical width of, for example, 45 mm. The display surface 41a faces upward. The optical axis A1 of the display 41 extends in the direction perpendicular to the display surface 41a from the center of the display surface 41a. The optical axis A1 of the display 41 is disposed so as to pass through the half mirror 42. The display surface 41 a of the display 41 is disposed so as to face the surface 42 a of the half mirror 42. The light emitted from the display 41 on which the image is displayed enters the half mirror 42. In FIG. 2, the optical axis A1 of the display 41 is arranged in parallel along the vertical direction.
　ハーフミラー（反射部）４２は、入射光の透過率が５０％である。言い換えると、ハーフミラー４２は、入射光の５０％を透過させ、残りの５０％を反射させる。ハーフミラー４２は、ディスプレイ４１に表示された映像を凹面鏡４３に向けて反射させる。言い換えると、ハーフミラー４２は、ディスプレイ４１から発せられた光を凹面鏡４３に向けて反射させる。ハーフミラー４２は、凹面鏡４３で反射された光を透過する。ハーフミラー４２は、ディスプレイ４１の光軸Ａ１上、かつ、凹面鏡４３の光軸Ａ２上に配置されている。言い換えると、ディスプレイ４１の光軸Ａ１と凹面鏡４３の光軸Ａ２とは、ハーフミラー４２上で直交している。ハーフミラー４２は、平面状に形成されている。本実施形態では、ハーフミラー４２は、左右方向の幅が例えば２５０ｍｍ、上下方向の幅が例えば８５ｍｍとする。ハーフミラー４２は、ディスプレイ４１に対して上方に配置されている。ハーフミラー４２の表面４２ａは、ディスプレイ４１の表示面４１ａと向かい合って配置されている。ハーフミラー４２の表面４２ａは、凹面鏡４３の表面４３ａと向かい合って配置されている。ハーフミラー４２は、ディスプレイ４１の光軸Ａ１に対して角度θ１傾斜して配置されている。ハーフミラー４２は、前方から後方に向かうにつれて、上方から下方に角度θ１傾斜して配置されている。本実施形態では、角度θ１は、４５°である。図２において、ハーフミラー４２は、鉛直方向に対して４５°傾斜して配置されている。本実施形態では、ハーフミラー４２は、乗員の視点からの距離が例えば３５０ｍｍに配置されている。本実施形態では、乗員の視点から凹面鏡４３の表面４３ａまでの距離が４８５ｍｍである。 The half mirror (reflecting part) 42 has a transmittance of incident light of 50%. In other words, the half mirror 42 transmits 50% of incident light and reflects the remaining 50%. The half mirror 42 reflects the image displayed on the display 41 toward the concave mirror 43. In other words, the half mirror 42 reflects the light emitted from the display 41 toward the concave mirror 43. The half mirror 42 transmits the light reflected by the concave mirror 43. The half mirror 42 is disposed on the optical axis A 1 of the display 41 and on the optical axis A 2 of the concave mirror 43. In other words, the optical axis A1 of the display 41 and the optical axis A2 of the concave mirror 43 are orthogonal to each other on the half mirror 42. The half mirror 42 is formed in a planar shape. In the present embodiment, the half mirror 42 has a horizontal width of, for example, 250 mm and a vertical width of, for example, 85 mm. The half mirror 42 is disposed above the display 41. The surface 42 a of the half mirror 42 is disposed to face the display surface 41 a of the display 41. The surface 42 a of the half mirror 42 is disposed to face the surface 43 a of the concave mirror 43. The half mirror 42 is disposed at an angle θ1 with respect to the optical axis A1 of the display 41. The half mirror 42 is disposed at an angle θ1 from the top to the bottom as it goes from the front to the rear. In the present embodiment, the angle θ1 is 45 °. In FIG. 2, the half mirror 42 is disposed with an inclination of 45 ° with respect to the vertical direction. In the present embodiment, the half mirror 42 is disposed at a distance of 350 mm, for example, from the viewpoint of the passenger. In the present embodiment, the distance from the passenger's viewpoint to the surface 43a of the concave mirror 43 is 485 mm.
　凹面鏡４３は、ハーフミラー４２で反射された光を反射させる。本実施形態では、凹面鏡４３は、曲率半径が例えば４２０ｍｍとする。凹面鏡４３は、前方に凹状に湾曲している。凹面鏡４３は、ハーフミラー４２に対して前方に配置されている。凹面鏡４３の表面４３ａは、ハーフミラー４２の表面４２ａと向かい合って配置されている。凹面鏡４３の光軸Ａ２は、ディスプレイ４１の光軸Ａ１とハーフミラー４２上で直交している。凹面鏡４３の曲率中心は、ディスプレイ４１と車両の乗員の視点との間の光軸上に配置されている。より詳しくは、凹面鏡４３の曲率中心は、ディスプレイ４１と乗員の視点との間の光軸Ａ２上に配置されている。図２において、凹面鏡４３の光軸Ａ２は、水平方向に沿って平行に配置されている。本実施形態では、凹面鏡４３の表面４３ａとハーフミラー４２の表面４２ａとの間の光軸Ａ２の長さは、ディスプレイ４１の表示面４１ａとハーフミラー４２の表面４２ａとの間の光軸Ａ１の長さより長い。 The concave mirror 43 reflects the light reflected by the half mirror 42. In the present embodiment, the concave mirror 43 has a radius of curvature of, for example, 420 mm. The concave mirror 43 is curved forward in a concave shape. The concave mirror 43 is disposed in front of the half mirror 42. The surface 43a of the concave mirror 43 is arranged to face the surface 42a of the half mirror 42. The optical axis A2 of the concave mirror 43 is orthogonal to the optical axis A1 of the display 41 on the half mirror. The center of curvature of the concave mirror 43 is disposed on the optical axis between the display 41 and the viewpoint of the vehicle occupant. More specifically, the center of curvature of the concave mirror 43 is disposed on the optical axis A2 between the display 41 and the occupant's viewpoint. In FIG. 2, the optical axis A2 of the concave mirror 43 is arranged in parallel along the horizontal direction. In the present embodiment, the length of the optical axis A2 between the surface 43a of the concave mirror 43 and the surface 42a of the half mirror 42 is the same as that of the optical axis A1 between the display surface 41a of the display 41 and the surface 42a of the half mirror 42. Longer than length.
　筐体４０は、開口４０ａを有する箱型に形成されている。筐体４０は、側壁４０ｂと、側壁４０ｂに対して傾斜して立設された側壁４０ｃと、側壁４０ｃに対して傾斜して立設された側壁４０ｄと、側壁４０ｂと直交して立設された側壁４０ｅと、側壁４０ｄと直交して配置された側壁４０ｆとを有する。開口４０ａは、側壁４０ｆと側壁４０ｅとの間に形成されている。筐体４０は、内部の空間に、ディスプレイ４１とハーフミラー４２と凹面鏡４３とが一体に組み付けられている。側壁４０ｂの後部に、ディスプレイ４１が配置されている。側壁４０ｄの上部に、凹面鏡４３が配置されている。開口４０ａは、ハーフミラー４２で覆われている。本実施形態では、筐体４０は、前後方向の幅Ｗ１１が１８５．２ｍｍ、上下方向の幅Ｗ１２が１０８ｍｍである。このように構成された筐体４０は、車両に取り付けられている。 The housing 40 is formed in a box shape having an opening 40a. The housing 40 is erected perpendicularly to the side wall 40b, the side wall 40c standing upright with respect to the side wall 40b, the side wall 40d standing upright with respect to the side wall 40c, and the side wall 40b. Side wall 40e and side wall 40f arranged orthogonal to side wall 40d. The opening 40a is formed between the side wall 40f and the side wall 40e. In the case 40, a display 41, a half mirror 42, and a concave mirror 43 are integrally assembled in an internal space. A display 41 is disposed at the rear of the side wall 40b. A concave mirror 43 is disposed above the side wall 40d. The opening 40 a is covered with a half mirror 42. In the present embodiment, the casing 40 has a width W11 in the front-rear direction of 185.2 mm and a width W12 in the vertical direction of 108 mm. The housing 40 configured in this way is attached to the vehicle.
　筐体４０は、図示しない角度調節部で上下方向に角度を調節自在である。図４－１および図４－２を用いて、角度調節部による筐体４０の角度調節について説明する。なお、本実施形態において、ハーフミラー４２は、乗員が見上げる位置に配置されているものとする。筐体４０は、角度調節部で角度を調節することで、第一所定位置または第二所定位置に位置付けられる。より詳しくは、筐体４０は、角度調節部で角度を調節することで、図４－１に示すように、ハーフミラー４２が鉛直方向に対して傾斜して配置された第一所定位置と、図４－２に示すように、ハーフミラー４２が鉛直方向に沿って略平行に配置された第二所定位置とを切り替えられる。筐体４０が、図４－１に示す第一所定位置に位置付けられると、ハーフミラー４２は、ディスプレイ４１の表示面４１ａから入射した光を凹面鏡４３に向けて反射させる。このとき、車両用表示システム１は、電子ミラーとして機能する。筐体４０が、図４－２に示す第二所定位置に位置付けられると、ハーフミラー４２は、光学式のミラーとして車両の後方の視界を反射させる。このとき、車両用表示システム１は、従来の光学式のルームミラーとして機能する。 The case 40 can be adjusted in the vertical direction by an angle adjusting unit (not shown). The angle adjustment of the housing 40 by the angle adjusting unit will be described with reference to FIGS. 4A and 4B. In the present embodiment, it is assumed that the half mirror 42 is disposed at a position where the occupant looks up. The housing 40 is positioned at the first predetermined position or the second predetermined position by adjusting the angle by the angle adjusting unit. More specifically, the housing 40 has a first predetermined position where the half mirror 42 is inclined with respect to the vertical direction as shown in FIG. As shown in FIG. 4B, the second predetermined position at which the half mirror 42 is arranged substantially in parallel along the vertical direction can be switched. When the housing 40 is positioned at the first predetermined position shown in FIG. 4A, the half mirror 42 reflects the light incident from the display surface 41 a of the display 41 toward the concave mirror 43. At this time, the vehicle display system 1 functions as an electronic mirror. When the housing 40 is positioned at the second predetermined position shown in FIG. 4B, the half mirror 42 reflects the field of view behind the vehicle as an optical mirror. At this time, the vehicle display system 1 functions as a conventional optical room mirror.
　次に、このように構成された車両用表示システム１における作用を説明する。まず、車両用表示システム１を電子ルームミラーとして使用する場合について説明する。 Next, the operation of the thus configured vehicle display system 1 will be described. First, the case where the vehicle display system 1 is used as an electronic room mirror will be described.
　筐体４０が、第一所定位置に位置付けられる。 The housing 40 is positioned at the first predetermined position.
　後方カメラ２は、撮影した車両後方の映像データを制御装置３の映像取得部３１に出力する。映像取得部３１は、後方カメラ２から映像データを取得し、表示制御部３２に出力する。表示制御部３２は、映像データを映像信号として車両用表示装置４のディスプレイ４１に出力する。 The rear camera 2 outputs the captured video data behind the vehicle to the video acquisition unit 31 of the control device 3. The video acquisition unit 31 acquires video data from the rear camera 2 and outputs the video data to the display control unit 32. The display control unit 32 outputs the video data as a video signal to the display 41 of the vehicle display device 4.
　ディスプレイ４１は、映像信号に基づいて車両後方の映像を表示面４１ａで表示させる。映像が表示されたディスプレイ４１は、光を発する。そして、発せられた光は、ハーフミラー４２へ入射する。そして、入射した光は、ハーフミラー４２で凹面鏡４３に向けて反射される。そして、反射された光は、凹面鏡４３に入射する。そして、入射した光は、凹面鏡４３でハーフミラー４２に向けて反射される。そして、反射された光は、ハーフミラー４２に入射する。凹面鏡４３で反射された光は、略平行光となっている。そして、入射した光は、ハーフミラー４２を透過して乗員に到達する。 The display 41 displays a video behind the vehicle on the display surface 41a based on the video signal. The display 41 on which the video is displayed emits light. The emitted light is incident on the half mirror 42. The incident light is reflected by the half mirror 42 toward the concave mirror 43. Then, the reflected light is incident on the concave mirror 43. The incident light is reflected by the concave mirror 43 toward the half mirror 42. Then, the reflected light is incident on the half mirror 42. The light reflected by the concave mirror 43 is substantially parallel light. The incident light passes through the half mirror 42 and reaches the occupant.
　車両用表示システム１を電子ルームミラーとして使用する場合における、乗員が視認する虚像の大きさについて説明する。凹面鏡４３の焦点（曲率半径の１／２）と凹面鏡４３との距離をｆとし、凹面鏡４３とディスプレイ４１の表示面４１ａとの距離をａとし、凹面鏡４３と虚像との距離をｂとすると、次式（１）が成り立つ。
ｂ＝ａｆ／（ａ－ｆ）　　　　　　　・・・（１）
式（１）において、ａ≦ｆの場合、ｂは負となり、凹面鏡４３の向こう側（車両に搭載した状態での前側）に虚像（正立虚像）ができる。さらに、式（１）において、ａをｆに近づけると、ｂ→∞となる。このときの、ディスプレイ４１の表示面４１ａに表示した物体の大きさＸと物体の虚像の大きさＸ´について、次式（２）が成り立つ。
Ｘ´／Ｘ＝｜ｆ｜／｜ａ－ｆ｜＞１　・・・（２）
式（２）より、次式（３）が成り立つ。
｜Ｘ´｜＞Ｘ　　　　　　　　　　　・・・（３）
式（３）より、虚像はディスプレイ４１に映した映像よりも大きくなる。 The magnitude | size of the virtual image which a passenger | crew visually recognizes when using the display system 1 for vehicles as an electronic room mirror is demonstrated. When the distance between the focal point of the concave mirror 43 (1/2 of the radius of curvature) and the concave mirror 43 is f, the distance between the concave mirror 43 and the display surface 41a of the display 41 is a, and the distance between the concave mirror 43 and the virtual image is b. The following equation (1) holds.
b = af / (af) (1)
In Formula (1), when a ≦ f, b is negative, and a virtual image (an upright virtual image) is formed on the other side of the concave mirror 43 (the front side when mounted on the vehicle). Furthermore, in Formula (1), when a is brought close to f, b → ∞. At this time, the following equation (2) holds for the size X of the object displayed on the display surface 41a of the display 41 and the size X ′ of the virtual image of the object.
X ′ / X = | f | / | af−> 1 (2)
From the equation (2), the following equation (3) is established.
| X '|> X (3)
From equation (3), the virtual image is larger than the image projected on the display 41.
　つづいて、車両用表示システム１を、従来の光学式のルームミラーとして使用する場合について説明する。 Next, a case where the vehicle display system 1 is used as a conventional optical room mirror will be described.
　筐体４０は、第二所定位置に位置付けられる。ディスプレイ４１は、ＯＦＦにされる。これにより、ハーフミラー４２は、従来の光学式のルームミラーと同様に、車両の後方の視界を反射する。 The housing 40 is positioned at the second predetermined position. The display 41 is turned off. As a result, the half mirror 42 reflects the field of view behind the vehicle, similar to a conventional optical room mirror.
　上述したように、本実施形態によれば、ディスプレイ４１とハーフミラー４２と凹面鏡４３とで構成される光路によって、映像が表示されたディスプレイ４１から発せられる光を略平行光にして、乗員の視点まで到達させる。これにより、虚像が、ディスプレイ４１とハーフミラー４２と凹面鏡４３とで構成される光路の実距離より遠方に表示される。このため、本実施形態によれば、乗員が車両の前方と電子ミラーを介して車両の後方とで視点を移動する際にも、視線の移動量が抑制される。本実施形態によれば、焦点を合わせやすいので、焦点合わせに要する時間を低減することができる。しかも、本実施形態によれば、虚像が光路の実距離より遠方に表示されるので、近距離に焦点を合わせることが困難な乗員であっても、後方を容易に視認することができる。このように、本実施形態によれば、後方の視認を容易にすることができる。 As described above, according to the present embodiment, the light emitted from the display 41 on which the image is displayed is made substantially parallel by the optical path constituted by the display 41, the half mirror 42, and the concave mirror 43, and the occupant's viewpoint To reach. As a result, the virtual image is displayed farther from the actual distance of the optical path formed by the display 41, the half mirror 42, and the concave mirror 43. For this reason, according to the present embodiment, the amount of movement of the line of sight is suppressed even when the occupant moves the viewpoint between the front of the vehicle and the rear of the vehicle via the electronic mirror. According to this embodiment, since it is easy to focus, the time required for focusing can be reduced. In addition, according to the present embodiment, since the virtual image is displayed farther than the actual distance of the optical path, even the occupant who is difficult to focus on the short distance can easily visually recognize the rear. As described above, according to the present embodiment, it is possible to facilitate rearward visual recognition.
　従来の光学式のバックミラーを使用し、後方を視認する場合、物体距離、数ｍ～数１００ｍに視点を合わせている。このため、乗員が、車両の前方と従来の光学式のバックミラーを介して車両の後方とで視点を移動しても、視線の移動量は小さく、瞬時に後方を確認することができる。本実施形態によれば、従来の光学式のバックミラーを使用した場合のように、乗員の目に対する負担を抑制することができる。 When using a conventional optical rearview mirror and viewing the back, the viewpoint is adjusted to an object distance of several meters to several hundred meters. Therefore, even if the occupant moves the viewpoint between the front of the vehicle and the rear of the vehicle via a conventional optical rearview mirror, the amount of line-of-sight movement is small and the rear can be confirmed instantaneously. According to the present embodiment, the burden on the passenger's eyes can be suppressed as in the case where a conventional optical rearview mirror is used.
　本実施形態によれば、凹面鏡４３の曲率中心が、ディスプレイ４１と乗員の視点との間の光軸Ａ２上に配置されていることで、凹面鏡４３に対する入射光が、凹面鏡４３の曲率中心に対して垂直に入射する。これにより、本実施形態によれば、凹面鏡４３を、球面や放物面などの単純な構成としても、映像の歪が大きくなったり、見る角度によって歪が変わったりして、めまいを生じることを抑制できる。このように、本実施形態は、凹面鏡４３を、単純な構成とすることができる。 According to the present embodiment, the center of curvature of the concave mirror 43 is arranged on the optical axis A2 between the display 41 and the occupant's viewpoint, so that the incident light on the concave mirror 43 is relative to the center of curvature of the concave mirror 43. Incident vertically. Thus, according to the present embodiment, even if the concave mirror 43 has a simple configuration such as a spherical surface or a paraboloid, the distortion of the image increases or the distortion changes depending on the viewing angle, resulting in dizziness. Can be suppressed. Thus, this embodiment can make the concave mirror 43 a simple structure.
　本実施形態によれば、凹面鏡４３で像が拡大されるので、ディスプレイ４１のサイズを小型化することができる。 According to the present embodiment, since the image is magnified by the concave mirror 43, the size of the display 41 can be reduced.
　本実施形態によれば、乗員が頭を動かして異なる角度で車両用表示装置４の凹面鏡４３を視認した際に見える範囲が切出され、ディスプレイ４１に表示されている。そして、ハーフミラー４２を介してディスプレイ４１を両眼で視認するので、凹面鏡４３を大型化することなく、両眼視での従来の光学式のバックミラーの画角と同等の画角を視認することができる。このように、本実施形態によれば、従来の光学式のバックミラーと同様に後方を視認することができる。 According to the present embodiment, the range that is visible when the occupant moves his head and visually recognizes the concave mirror 43 of the vehicle display device 4 at different angles is cut out and displayed on the display 41. And since the display 41 is visually recognized with both eyes via the half mirror 42, the angle of view equivalent to the angle of view of the conventional optical rearview mirror in binocular vision is visually recognized without increasing the size of the concave mirror 43. be able to. Thus, according to the present embodiment, the rear side can be visually recognized in the same manner as a conventional optical rearview mirror.
　本実施形態によれば、角度調節部で筐体４０を第一所定位置と第二所定位置とを切り替えることで、電子ルームミラーと従来の光学式のルームミラーとを切り替えて使用することができる。 According to the present embodiment, the electronic room mirror and the conventional optical room mirror can be switched and used by switching the housing 40 between the first predetermined position and the second predetermined position by the angle adjustment unit. .
［第二実施形態］
　図５を参照しながら、本実施形態に係る車両用表示システム１Ａについて説明する。図５は、第二実施形態に係る車両用表示装置の構成例を示す概略図である。車両用表示システム１Ａは、基本的な構成は第一実施形態の車両用表示システム１と同様である。以下の説明においては、車両用表示システム１と同様の構成要素には、同一の符号または対応する符号を付し、その詳細な説明は省略する。 [Second Embodiment]
A vehicle display system 1A according to the present embodiment will be described with reference to FIG. FIG. 5 is a schematic diagram illustrating a configuration example of the vehicle display device according to the second embodiment. The vehicle display system 1A has the same basic configuration as the vehicle display system 1 of the first embodiment. In the following description, the same components as those of the vehicle display system 1 are denoted by the same reference numerals or corresponding reference numerals, and detailed description thereof is omitted.
　本実施形態の車両用表示システム１Ａの車両用表示装置４Ａは、ハーフミラー４２の代わりに偏光板（反射部）４２Ａを備える点と、波長板４４Ａを備える点とが、第一実施形態の車両用表示システム１の車両用表示装置４と異なる。 The vehicle display device 4A of the vehicle display system 1A according to the present embodiment includes the polarizing plate (reflecting portion) 42A instead of the half mirror 42 and the point provided with the wavelength plate 44A. This is different from the vehicle display device 4 of the display system 1.
　偏光板４２Ａは、ワイヤーグリッド式の偏光板である。本実施形態では、偏光板４２Ａは、直交する２つの偏光成分であるｐ偏光とｓ偏光とに対して、ｐ偏光を透過させ、ｓ偏光を反射させる。偏光板４２Ａは、ディスプレイ４１から発せられた光を凹面鏡４３に向けて反射させる。偏光板４２Ａは、凹面鏡４３で反射された光を透過する。偏光板４２Ａは、平面状に形成されている。偏光板４２Ａは、ハーフミラー４２と同様に配置されている。 The polarizing plate 42A is a wire grid type polarizing plate. In the present embodiment, the polarizing plate 42A transmits p-polarized light and reflects s-polarized light with respect to p-polarized light and s-polarized light that are two orthogonally polarized components. The polarizing plate 42A reflects the light emitted from the display 41 toward the concave mirror 43. The polarizing plate 42A transmits the light reflected by the concave mirror 43. The polarizing plate 42A is formed in a planar shape. The polarizing plate 42A is arranged in the same manner as the half mirror 42.
　波長板４４Ａは、ｐ偏光とｓ偏光とに位相差をつけ入射偏光の状態を変化させる。波長板４４Ａは、１／４波長板である。波長板４４Ａは、ｐ偏光とｓ偏光とにλ／４（９０°）の位相差を与える。波長板４４Ａは、凹面鏡４３の表面４３ａに貼付されている。 The wave plate 44A changes the state of incident polarized light by making a phase difference between p-polarized light and s-polarized light. The wave plate 44A is a quarter wave plate. The wave plate 44A gives a phase difference of λ / 4 (90 °) to the p-polarized light and the s-polarized light. The wave plate 44 </ b> A is affixed to the surface 43 a of the concave mirror 43.
　本実施形態において、ディスプレイ４１から発せられたｓ偏光が偏光板４２Ａへ入射する。そして、入射したｓ偏光は、偏光板４２Ａで凹面鏡４３に向けて反射される。そして、偏光板４２Ａで反射されたｓ偏光は、波長板４４Ａへ入射する。そして、入射したｓ偏光は、波長板４４Ａによって円偏光になる。円偏光は、凹面鏡４３で反射し、再び波長板４４Ａに入射して直線偏光に戻る。このとき、凹面鏡４３で反射したことで円偏光の回転方向が逆向きになっているので位相が９０°回ったｐ偏光に変わる。位相が９０°回ったｐ偏光は、偏光板４２Ａを透過して乗員に到達する。このように、本実施形態では、光がハーフミラーを通らないため、乗員に到達するまでの光路における光量の低減を大幅に抑制することができる。 In this embodiment, the s-polarized light emitted from the display 41 enters the polarizing plate 42A. The incident s-polarized light is reflected toward the concave mirror 43 by the polarizing plate 42A. Then, the s-polarized light reflected by the polarizing plate 42A enters the wave plate 44A. The incident s-polarized light becomes circularly polarized light by the wave plate 44A. The circularly polarized light is reflected by the concave mirror 43, enters the wave plate 44A again, and returns to linearly polarized light. At this time, since the rotation direction of the circularly polarized light is reversed due to reflection by the concave mirror 43, the phase is changed to p-polarized light whose phase is rotated by 90 °. The p-polarized light whose phase is rotated by 90 ° passes through the polarizing plate 42A and reaches the occupant. Thus, in this embodiment, since light does not pass through a half mirror, reduction of the light quantity in the optical path until it reaches an occupant can be significantly suppressed.
　これに対して、第一実施形態では、光がハーフミラー４２で凹面鏡４３に向けて反射され、さらに、凹面鏡４３でハーフミラー４２に向けて反射されハーフミラー４２を透過する。このように、乗員に到達するまでの光路において、光が、透過率５０％のハーフミラー４２を反射時と透過時の２回通り抜けることになる。このため、光量は、１／４まで低減されている。 On the other hand, in the first embodiment, the light is reflected by the half mirror 42 toward the concave mirror 43, and further reflected by the concave mirror 43 toward the half mirror 42 and passes through the half mirror 42. In this way, light passes through the half mirror 42 having a transmittance of 50% twice during reflection and transmission in the optical path to reach the occupant. For this reason, the light quantity is reduced to 1/4.
［第三実施形態］
　図６を参照しながら、本実施形態に係る車両用表示システム１Ｂについて説明する。図６は、第三実施形態に係る車両用表示装置の構成例を示す概略図である。 [Third embodiment]
The vehicle display system 1B according to the present embodiment will be described with reference to FIG. FIG. 6 is a schematic diagram illustrating a configuration example of the vehicular display device according to the third embodiment.
　本実施形態の車両用表示システム１Ｂは、車両用表示装置４Ｂを構成する光学素子の配置が、第一実施形態の車両用表示システム１の車両用表示装置４と異なる。 The vehicle display system 1B of the present embodiment is different from the vehicle display device 4 of the vehicle display system 1 of the first embodiment in the arrangement of optical elements constituting the vehicle display device 4B.
　車両用表示装置４Ｂは、ディスプレイ４１Ｂと、ハーフミラー４２Ｂと、凹面鏡４３Ｂと、これらを収容する筐体４０Ｂとを有する。 The vehicle display device 4B includes a display 41B, a half mirror 42B, a concave mirror 43B, and a housing 40B that accommodates these.
　ディスプレイ４１Ｂは、表示面４１Ｂａが後上方に向いている。図６において、ディスプレイ４１Ｂの光軸Ａ１Ｂは、鉛直方向に対して角度θ２傾斜して配置されている。本実施形態では、角度θ２は、２０°である。 In the display 41B, the display surface 41Ba faces rearward and upward. In FIG. 6, the optical axis A1B of the display 41B is arranged with an angle θ2 inclined with respect to the vertical direction. In the present embodiment, the angle θ2 is 20 °.
　ハーフミラー４２Ｂは、ディスプレイ４１Ｂに対して後上方に配置されている。ハーフミラー４２Ｂの表面４２Ｂａは、ディスプレイ４１Ｂの表示面４１Ｂａと向かい合って配置されている。ハーフミラー４２Ｂは、ディスプレイ４１Ｂの光軸Ａ１Ｂに対して角度θ３傾斜して配置されている。ハーフミラー４２Ｂは、前方から後方に向かうにつれて、上方から下方に角度θ３傾斜して配置されている。本実施形態では、角度θ３は、５５°である。ハーフミラー４２Ｂは、ディスプレイ４１Ｂの光軸Ａ１Ｂ上、かつ、凹面鏡４３Ｂの光軸Ａ２Ｂ上に配置されている。言い換えると、ディスプレイ４１Ｂの光軸Ａ１Ｂと凹面鏡４３Ｂの光軸Ａ２Ｂとは、ハーフミラー４２Ｂ上で交差している。 The half mirror 42B is disposed on the rear upper side with respect to the display 41B. The surface 42Ba of the half mirror 42B is disposed to face the display surface 41Ba of the display 41B. The half mirror 42B is disposed at an angle θ3 with respect to the optical axis A1B of the display 41B. The half mirror 42 </ b> B is arranged with an angle θ <b> 3 inclined downward from above as it goes from the front to the rear. In the present embodiment, the angle θ3 is 55 °. The half mirror 42B is disposed on the optical axis A1B of the display 41B and on the optical axis A2B of the concave mirror 43B. In other words, the optical axis A1B of the display 41B and the optical axis A2B of the concave mirror 43B intersect on the half mirror 42B.
　図６におけるハーフミラー４２Ｂの配置について説明する。ハーフミラー４２Ｂは、水平方向に対して５５°傾斜して配置されている。ハーフミラー４２Ｂの前端部４２Ｂｂは、ディスプレイ４１Ｂの前端部４１Ｂｂより後方に配置されている。ハーフミラー４２Ｂの後端部４２Ｂｃは、ディスプレイ４１Ｂの後端部４１Ｂｃより後方に配置されている。 The arrangement of the half mirror 42B in FIG. 6 will be described. The half mirror 42B is disposed with an inclination of 55 ° with respect to the horizontal direction. The front end portion 42Bb of the half mirror 42B is disposed behind the front end portion 41Bb of the display 41B. The rear end portion 42Bc of the half mirror 42B is disposed behind the rear end portion 41Bc of the display 41B.
　凹面鏡４３Ｂは、ハーフミラー４２Ｂに対して前方に配置されている。凹面鏡４３Ｂの表面４３Ｂａは、ハーフミラー４２Ｂの表面４２Ｂａと向かい合って配置されている。凹面鏡４３Ｂの光軸Ａ２Ｂは、ディスプレイ４１Ｂの光軸Ａ１Ｂとハーフミラー４２Ｂ上で交差している。本実施形態では、凹面鏡４３Ｂの光軸Ａ２Ｂとディスプレイ４１Ｂの光軸Ａ１Ｂとの角度θ４が７０°である。図６において、凹面鏡４３Ｂの光軸Ａ２Ｂは、水平方向に沿って平行に配置されている。本実施形態では、凹面鏡４３Ｂの表面４３Ｂａとハーフミラー４２Ｂの表面４２Ｂａとの間の光軸Ａ２Ｂの長さは、ディスプレイ４１Ｂの表示面４１Ｂａとハーフミラー４２Ｂの表面４２Ｂａとの間の光軸Ａ１Ｂの長さより短い。 The concave mirror 43B is disposed in front of the half mirror 42B. The surface 43Ba of the concave mirror 43B is disposed to face the surface 42Ba of the half mirror 42B. The optical axis A2B of the concave mirror 43B intersects the optical axis A1B of the display 41B on the half mirror 42B. In the present embodiment, the angle θ4 between the optical axis A2B of the concave mirror 43B and the optical axis A1B of the display 41B is 70 °. In FIG. 6, the optical axis A2B of the concave mirror 43B is disposed in parallel along the horizontal direction. In this embodiment, the length of the optical axis A2B between the surface 43Ba of the concave mirror 43B and the surface 42Ba of the half mirror 42B is equal to the optical axis A1B between the display surface 41Ba of the display 41B and the surface 42Ba of the half mirror 42B. Shorter than length.
　筐体４０Ｂは、開口４０Ｂａを有する箱型に形成されている。筐体４０Ｂは、側壁４０Ｂｂと、側壁４０Ｂｂに対して傾斜して立設された側壁４０Ｂｃと、側壁４０Ｂｃと直交して立設された側壁４０Ｂｄと、側壁４０Ｂｂと直交して立設された側壁４０Ｂｅとを有する。開口４０Ｂａは、側壁４０Ｂｄと側壁４０Ｂｅとの間に形成されている。側壁４０Ｂｂに、ディスプレイ４１Ｂが配置されている。側壁４０Ｂｃの上部に、凹面鏡４３Ｂが配置されている。開口４０Ｂａは、ハーフミラー４２Ｂで覆われている。本実施形態では、筐体４０Ｂは、前後方向の幅Ｗ２１が１１７．９ｍｍ、上下方向の幅Ｗ２２が１６８．４６ｍｍである。 The housing 40B is formed in a box shape having an opening 40Ba. The housing 40B includes a side wall 40Bb, a side wall 40Bc that is inclined and inclined with respect to the side wall 40Bb, a side wall 40Bd that is erected perpendicular to the side wall 40Bc, and a side wall that is erected perpendicular to the side wall 40Bb. 40Be. The opening 40Ba is formed between the side wall 40Bd and the side wall 40Be. A display 41B is disposed on the side wall 40Bb. A concave mirror 43B is disposed on the side wall 40Bc. The opening 40Ba is covered with a half mirror 42B. In the present embodiment, the casing 40B has a front-rear width W21 of 117.9 mm and a vertical width W22 of 168.46 mm.
　上述したように、本実施形態によれば、図６に示すように、ディスプレイ４１Ｂとハーフミラー４２Ｂと凹面鏡４３Ｂとを配置することで、筐体４０Ｂの前後方向の幅Ｗ２１を第一実施形態の筐体４０の前後方向の幅Ｗ１１より小さくすることができる。 As described above, according to the present embodiment, as shown in FIG. 6, by arranging the display 41B, the half mirror 42B, and the concave mirror 43B, the width W21 in the front-rear direction of the housing 40B is the same as that of the first embodiment. It can be made smaller than the width W11 of the housing 40 in the front-rear direction.
［第四実施形態］
　図７を参照しながら、本実施形態に係る車両用表示システム１Ｃについて説明する。図７は、第四実施形態に係る車両用表示装置の構成例を示す概略図である。 [Fourth embodiment]
A vehicle display system 1C according to the present embodiment will be described with reference to FIG. FIG. 7 is a schematic diagram illustrating a configuration example of the vehicle display device according to the fourth embodiment.
　本実施形態の車両用表示システム１Ｃは、車両用表示装置４Ｃが全反射ミラー４４Ｃを備える点で、第一実施形態の車両用表示システム１の車両用表示装置４と異なる。 The vehicle display system 1C of the present embodiment is different from the vehicle display device 4 of the vehicle display system 1 of the first embodiment in that the vehicle display device 4C includes a total reflection mirror 44C.
　車両用表示装置４Ｃは、ディスプレイ４１Ｃと、ハーフミラー４２Ｃと、凹面鏡４３Ｃと、全反射ミラー４４Ｃと、これらを収容する筐体４０Ｃとを有する。 The vehicle display device 4C includes a display 41C, a half mirror 42C, a concave mirror 43C, a total reflection mirror 44C, and a housing 40C that accommodates these.
　ディスプレイ４１Ｃは、表示面４１Ｃａが上方に向いている。ディスプレイ４１Ｃの光軸Ａ１Ｃは、ハーフミラー４２Ｃを通るように配置されている。図７において、ディスプレイ４１Ｃの光軸Ａ１Ｃは、鉛直方向に沿って平行に配置されている。 The display surface 41Ca of the display 41C faces upward. The optical axis A1C of the display 41C is disposed so as to pass through the half mirror 42C. In FIG. 7, the optical axis A1C of the display 41C is arranged in parallel along the vertical direction.
　ハーフミラー４２Ｃは、ディスプレイ４１Ｃに対して上方、かつ、全反射ミラー４４Ｃに対して後方に配置されている。ハーフミラー４２Ｃの表面４２Ｃａは、ディスプレイ４１Ｃの表示面４１Ｃａと向かい合って配置されている。ハーフミラー４２Ｃの表面４２Ｃａは、全反射ミラー４４Ｃの表面４４Ｃａと向かい合って配置されている。ハーフミラー４２Ｃは、ディスプレイ４１Ｃの光軸Ａ１Ｃに対して角度θ５傾斜して配置されている。ハーフミラー４２Ｃは、前方から後方に向かうにつれて、上方から下方に角度θ５傾斜して配置されている。本実施形態では、角度θ５は、４５°である。ハーフミラー４２Ｃの光軸Ａ３Ｃは、全反射ミラー４４Ｃの光軸と同軸である。ハーフミラー４２Ｃは、ディスプレイ４１Ｃの光軸Ａ１Ｃ上に配置されている。ディスプレイ４１Ｃの光軸Ａ１Ｃとハーフミラー４２Ｃの光軸Ａ３Ｃとは、ハーフミラー４２Ｃ上で直交している。 The half mirror 42C is disposed above the display 41C and behind the total reflection mirror 44C. The surface 42Ca of the half mirror 42C is disposed to face the display surface 41Ca of the display 41C. The surface 42Ca of the half mirror 42C is disposed to face the surface 44Ca of the total reflection mirror 44C. The half mirror 42C is disposed at an angle θ5 with respect to the optical axis A1C of the display 41C. The half mirror 42 </ b> C is disposed with an angle θ <b> 5 inclined downward from above as it goes from the front to the rear. In the present embodiment, the angle θ5 is 45 °. The optical axis A3C of the half mirror 42C is coaxial with the optical axis of the total reflection mirror 44C. The half mirror 42C is disposed on the optical axis A1C of the display 41C. The optical axis A1C of the display 41C and the optical axis A3C of the half mirror 42C are orthogonal to each other on the half mirror 42C.
　図７において、ハーフミラー４２Ｃは、水平方向に対して４５°傾斜して配置されている。 In FIG. 7, the half mirror 42C is disposed with an inclination of 45 ° with respect to the horizontal direction.
　凹面鏡４３Ｃは、ディスプレイ４１Ｃに対して前方、かつ、全反射ミラー４４Ｃに対して下方に配置されている。凹面鏡４３Ｃの表面４３Ｃａは、全反射ミラー４４Ｃの表面４４Ｃａと向かい合って配置されている。凹面鏡４３Ｃの光軸Ａ２Ｃは、ディスプレイ４１Ｃの光軸Ａ１Ｃと平行に配置されている。凹面鏡４３Ｃの光軸Ａ２Ｃは、全反射ミラー４４Ｃの光軸Ａ３Ｃと全反射ミラー４４Ｃ上で直交している。図７において、凹面鏡４３Ｃの光軸Ａ２Ｃは、鉛直方向に沿って平行に配置されている。 The concave mirror 43C is disposed in front of the display 41C and below the total reflection mirror 44C. The surface 43Ca of the concave mirror 43C is disposed to face the surface 44Ca of the total reflection mirror 44C. The optical axis A2C of the concave mirror 43C is arranged in parallel with the optical axis A1C of the display 41C. The optical axis A2C of the concave mirror 43C is orthogonal to the optical axis A3C of the total reflection mirror 44C on the total reflection mirror 44C. In FIG. 7, the optical axis A2C of the concave mirror 43C is arranged in parallel along the vertical direction.
　全反射ミラー４４Ｃは、入射光の透過率が０％である。言い換えると、全反射ミラー４４Ｃは、入射光を全反射させる。全反射ミラー４４Ｃは、ハーフミラー４２Ｃで反射された光を凹面鏡４３Ｃに向けて反射させる。全反射ミラー４４Ｃは、凹面鏡４３Ｃで反射された光をハーフミラー４２Ｃに向けて反射させる。全反射ミラー４４Ｃは、平面状に形成されている。全反射ミラー４４Ｃは、ハーフミラー４２Ｃに対して前方、かつ、凹面鏡４３Ｃに対して上方に配置されている。全反射ミラー４４Ｃの表面４４Ｃａは、ハーフミラー４２Ｃの表面４２Ｃａと向かい合って配置されている。全反射ミラー４４Ｃの表面４４Ｃａは、凹面鏡４３Ｃの表面４３Ｃａと向かい合って配置されている。全反射ミラー４４Ｃは、凹面鏡４３Ｃの光軸Ａ２Ｃに対して角度θ６傾斜して配置されている。全反射ミラー４４Ｃは、前方から後方に向かうにつれて、下方から上方に角度θ６傾斜して配置されている。本実施形態では、角度θ６は、４５°である。図７において、全反射ミラー４４Ｃは、水平方向に対して４５°傾斜して配置されている。 The total reflection mirror 44C has a transmittance of incident light of 0%. In other words, the total reflection mirror 44C totally reflects incident light. The total reflection mirror 44C reflects the light reflected by the half mirror 42C toward the concave mirror 43C. The total reflection mirror 44C reflects the light reflected by the concave mirror 43C toward the half mirror 42C. The total reflection mirror 44C is formed in a planar shape. The total reflection mirror 44C is disposed in front of the half mirror 42C and above the concave mirror 43C. The surface 44Ca of the total reflection mirror 44C is disposed to face the surface 42Ca of the half mirror 42C. The surface 44Ca of the total reflection mirror 44C is disposed to face the surface 43Ca of the concave mirror 43C. The total reflection mirror 44C is disposed at an angle θ6 with respect to the optical axis A2C of the concave mirror 43C. The total reflection mirror 44 </ b> C is disposed so as to incline at an angle θ <b> 6 from the bottom to the top as it goes from the front to the rear. In the present embodiment, the angle θ6 is 45 °. In FIG. 7, the total reflection mirror 44C is disposed with an inclination of 45 ° with respect to the horizontal direction.
　筐体４０Ｃは、開口４０Ｃａを有する箱型に形成されている。筐体４０Ｃは、側壁４０Ｃｂと、側壁４０Ｃｂと直交して立設された側壁４０Ｃｃ、側壁４０Ｃｄと、側壁４０Ｃｃと直交して立設された側壁４０Ｃｅとを有する。開口４０Ｃａは、側壁４０Ｃｄと側壁４０Ｃｅとの間に形成されている。側壁４０Ｃｂに、ディスプレイ４１Ｃと凹面鏡４３Ｃとが配置されている。側壁４０Ｃｃと側壁４０Ｃｅの間に、全反射ミラー４４Ｃが配置されている。開口４０Ｃａは、ハーフミラー４２Ｃで覆われている。本実施形態では、筐体４０Ｃは、前後方向の幅Ｗ３１が１５２．４５ｍｍ、上下方向の幅Ｗ３２が１０９ｍｍである。 The housing 40C is formed in a box shape having an opening 40Ca. The housing 40C includes a side wall 40Cb, a side wall 40Cc erected perpendicular to the side wall 40Cb, a side wall 40Cd, and a side wall 40Ce erected perpendicular to the side wall 40Cc. The opening 40Ca is formed between the side wall 40Cd and the side wall 40Ce. A display 41C and a concave mirror 43C are disposed on the side wall 40Cb. A total reflection mirror 44C is disposed between the side wall 40Cc and the side wall 40Ce. The opening 40Ca is covered with a half mirror 42C. In the present embodiment, the casing 40C has a width W31 in the front-rear direction of 152.45 mm and a width W32 in the up-down direction of 109 mm.
　本実施形態において、ディスプレイ４１Ｃから発せられた光がハーフミラー４２Ｃへ入射する。そして、入射した光は、ハーフミラー４２Ｃで全反射ミラー４４Ｃに向けて反射される。そして、反射された光は、全反射ミラー４４Ｃに入射する。そして、入射した光は、全反射ミラー４４Ｃで凹面鏡４３Ｃに向けて反射される。そして、反射された光は、凹面鏡４３Ｃに入射する。そして、入射した光は、凹面鏡４３Ｃで全反射ミラー４４Ｃに向けて反射される。凹面鏡４３Ｃで反射された光は、略平行光となっている。そして、反射された光は、全反射ミラー４４Ｃに入射する。そして、入射した光は、全反射ミラー４４Ｃでハーフミラー４２Ｃに向けて反射される。そして、反射された光は、ハーフミラー４２Ｃに入射する。そして、光は、ハーフミラー４２Ｃを透過して乗員に到達する。 In the present embodiment, light emitted from the display 41C enters the half mirror 42C. The incident light is reflected by the half mirror 42C toward the total reflection mirror 44C. Then, the reflected light enters the total reflection mirror 44C. The incident light is reflected by the total reflection mirror 44C toward the concave mirror 43C. The reflected light enters the concave mirror 43C. The incident light is reflected by the concave mirror 43C toward the total reflection mirror 44C. The light reflected by the concave mirror 43C is substantially parallel light. Then, the reflected light enters the total reflection mirror 44C. The incident light is reflected by the total reflection mirror 44C toward the half mirror 42C. The reflected light is incident on the half mirror 42C. Then, the light passes through the half mirror 42C and reaches the occupant.
　上述したように、本実施形態によれば、図７に示すように、ディスプレイ４１Ｃとハーフミラー４２Ｃと凹面鏡４３Ｃと全反射ミラー４４Ｃとを配置することで、筐体４０Ｃの上下方向の幅Ｗ３２を第一実施形態の筐体４０の上下方向の幅Ｗ１２とほぼ変えることなく、前後方向の幅Ｗ３１を第一実施形態の筐体４０の前後方向の幅Ｗ１１より小さくすることができる。 As described above, according to the present embodiment, as shown in FIG. 7, by arranging the display 41C, the half mirror 42C, the concave mirror 43C, and the total reflection mirror 44C, the width W32 in the vertical direction of the housing 40C can be increased. The width W31 in the front-rear direction can be made smaller than the width W11 in the front-rear direction of the casing 40 of the first embodiment without substantially changing the width W12 in the vertical direction of the casing 40 of the first embodiment.
［第五実施形態］
　図８を参照しながら、本実施形態に係る車両用表示システム１Ｄについて説明する。図８は、第五実施形態に係る車両用表示装置の構成例を示す概略図である。 [Fifth embodiment]
The vehicle display system 1D according to the present embodiment will be described with reference to FIG. FIG. 8 is a schematic diagram illustrating a configuration example of the vehicle display device according to the fifth embodiment.
　本実施形態の車両用表示システム１Ｄは、車両用表示装置４Ｄを構成する光学素子の配置が、第四実施形態の車両用表示システム１Ｃの車両用表示装置４Ｃと異なる。 The vehicle display system 1D of the present embodiment differs from the vehicle display device 4C of the vehicle display system 1C of the fourth embodiment in the arrangement of optical elements constituting the vehicle display device 4D.
　車両用表示装置４Ｄは、ディスプレイ４１Ｄと、ハーフミラー４２Ｄと、凹面鏡４３Ｄと、全反射ミラー４４Ｄと、これらを収容する筐体４０Ｄとを有する。 The vehicle display device 4D includes a display 41D, a half mirror 42D, a concave mirror 43D, a total reflection mirror 44D, and a housing 40D that accommodates these.
　ディスプレイ４１Ｄは、表示面４１Ｄａが後方に向いている。ディスプレイ４１Ｄの光軸Ａ１Ｄは、全反射ミラー４４Ｄを通るように配置されている。図８において、ディスプレイ４１Ｄは、光軸Ａ１Ｄが水平方向に沿って平行に配置されている。 Display 41D has display surface 41Da facing backward. The optical axis A1D of the display 41D is disposed so as to pass through the total reflection mirror 44D. In FIG. 8, the display 41D has an optical axis A1D arranged in parallel along the horizontal direction.
　ハーフミラー４２Ｄは、ディスプレイ４１Ｄに対して後上方、かつ、凹面鏡４３Ｄに対して後方に配置されている。ハーフミラー４２Ｄの表面４２Ｄａは、凹面鏡４３Ｄの表面４３Ｄａと向かい合って配置されている。ハーフミラー４２Ｄの表面４２Ｄａは、全反射ミラー４４Ｄの表面４４Ｄａと向かい合って配置されている。ハーフミラー４２Ｄは、凹面鏡４３Ｄの光軸Ａ２Ｄに対して角度θ７傾斜して配置されている。ハーフミラー４２Ｄは、前方から後方に向かうにつれて、上方から下方に角度θ７傾斜して配置されている。本実施形態では、角度θ７は、４５°である。ハーフミラー４２Ｄの光軸Ａ３Ｄは、全反射ミラー４４Ｄの光軸と同軸である。ハーフミラー４２Ｄは、凹面鏡４３Ｄの光軸Ａ２Ｄ上に配置されている。凹面鏡４３Ｄの光軸Ａ２Ｄとハーフミラー４２Ｄの光軸Ａ３Ｄとは、ハーフミラー４２Ｄ上で直交している。図８において、ハーフミラー４２Ｄは、水平方向に対して４５°傾斜して配置されている。 The half mirror 42D is disposed rearward and upward with respect to the display 41D and rearward with respect to the concave mirror 43D. The surface 42Da of the half mirror 42D is disposed to face the surface 43Da of the concave mirror 43D. The surface 42Da of the half mirror 42D is disposed to face the surface 44Da of the total reflection mirror 44D. The half mirror 42D is disposed at an angle θ7 with respect to the optical axis A2D of the concave mirror 43D. The half mirror 42D is disposed so as to be inclined at an angle θ7 from above to below as it goes from the front to the rear. In the present embodiment, the angle θ7 is 45 °. The optical axis A3D of the half mirror 42D is coaxial with the optical axis of the total reflection mirror 44D. The half mirror 42D is disposed on the optical axis A2D of the concave mirror 43D. The optical axis A2D of the concave mirror 43D and the optical axis A3D of the half mirror 42D are orthogonal to each other on the half mirror 42D. In FIG. 8, the half mirror 42D is disposed with an inclination of 45 ° with respect to the horizontal direction.
　凹面鏡４３Ｄは、ディスプレイ４１Ｄに対して上方、かつ、ハーフミラー４２Ｄに対して前方に配置されている。凹面鏡４３Ｄの表面４３Ｄａは、ハーフミラー４２Ｄの表面４２Ｄａと向かい合って配置されている。凹面鏡４３Ｄの光軸Ａ２Ｄは、ディスプレイ４１Ｄの光軸Ａ１Ｄと平行に配置されている。凹面鏡４３Ｄの光軸Ａ２Ｄは、全反射ミラー４４Ｄの光軸Ａ３Ｄと直交している。図８において、凹面鏡４３Ｄの光軸Ａ２Ｄは、水平方向に沿って平行に配置されている。 The concave mirror 43D is arranged above the display 41D and ahead of the half mirror 42D. The surface 43Da of the concave mirror 43D is disposed to face the surface 42Da of the half mirror 42D. The optical axis A2D of the concave mirror 43D is arranged in parallel with the optical axis A1D of the display 41D. The optical axis A2D of the concave mirror 43D is orthogonal to the optical axis A3D of the total reflection mirror 44D. In FIG. 8, the optical axis A2D of the concave mirror 43D is arranged in parallel along the horizontal direction.
　全反射ミラー４４Ｄは、ディスプレイ４１Ｄから発せられた光をハーフミラー４２Ｄに向けて反射させる。全反射ミラー４４Ｄは、ディスプレイ４１Ｄに対して後方、かつ、ハーフミラー４２Ｄに対して下方に配置されている。全反射ミラー４４Ｄの表面４４Ｄａは、ディスプレイ４１Ｄの表示面４１Ｄａと向かい合って配置されている。全反射ミラー４４Ｄの表面４４Ｄａは、ハーフミラー４２Ｄの表面４２Ｄａと向かい合って配置されている。全反射ミラー４４Ｄは、ディスプレイ４１Ｄの光軸Ａ１Ｄに対して角度θ８傾斜して配置されている。全反射ミラー４４Ｄは、前方から後方に向かうにつれて、下方から上方に角度θ８傾斜して配置されている。本実施形態では、角度θ８は、４５°である。全反射ミラー４４Ｄの光軸Ａ３Ｄとディスプレイ４１Ｄの光軸Ａ１Ｄとは、全反射ミラー４４Ｄ上で直交している。図８において、全反射ミラー４４Ｄは、水平方向に対して４５°傾斜して配置されている。 The total reflection mirror 44D reflects the light emitted from the display 41D toward the half mirror 42D. The total reflection mirror 44D is disposed behind the display 41D and below the half mirror 42D. The surface 44Da of the total reflection mirror 44D is disposed to face the display surface 41Da of the display 41D. The surface 44Da of the total reflection mirror 44D is disposed to face the surface 42Da of the half mirror 42D. The total reflection mirror 44D is disposed at an angle θ8 with respect to the optical axis A1D of the display 41D. The total reflection mirror 44D is disposed so as to be inclined at an angle θ8 from the bottom to the top as it goes from the front to the rear. In the present embodiment, the angle θ8 is 45 °. The optical axis A3D of the total reflection mirror 44D and the optical axis A1D of the display 41D are orthogonal to each other on the total reflection mirror 44D. In FIG. 8, the total reflection mirror 44D is disposed with an inclination of 45 ° with respect to the horizontal direction.
　筐体４０Ｄは、開口４０Ｄａを有する箱型に形成されている。筐体４０Ｄは、側壁４０Ｄｂと、側壁４０Ｄｂと直交して立設された側壁４０Ｄｃと、側壁４０Ｄｃと直交して立設された側壁４０Ｄｄと、側壁４０Ｄｂに対して傾斜して立設された側壁４０Ｄｅとを有する。開口４０Ｄａは、側壁４０Ｄｄと側壁４０Ｄｅとの間に形成されている。側壁４０Ｄｃに、ディスプレイ４１Ｄと凹面鏡４３Ｄとが上下に配置されている。側壁４０Ｄｅに、全反射ミラー４４Ｄが配置されている。開口４０Ｄａは、ハーフミラー４２Ｄで覆われている。本実施形態では、筐体４０Ｄは、前後方向の幅Ｗ４１が１１３．７５ｍｍ、上下方向の幅Ｗ４２が１３９ｍｍである。 The housing 40D is formed in a box shape having an opening 40Da. The housing 40D includes a side wall 40Db, a side wall 40Dc erected perpendicular to the side wall 40Db, a side wall 40Dd erected perpendicular to the side wall 40Dc, and a side wall inclined to the side wall 40Db. 40De. The opening 40Da is formed between the side wall 40Dd and the side wall 40De. A display 41D and a concave mirror 43D are vertically arranged on the side wall 40Dc. A total reflection mirror 44D is disposed on the side wall 40De. The opening 40Da is covered with a half mirror 42D. In the present embodiment, the housing 40D has a width W41 in the front-rear direction of 113.75 mm and a width W42 in the up-down direction of 139 mm.
　本実施形態において、ディスプレイ４１Ｄから発せられた光が全反射ミラー４４Ｄに入射する。そして、入射した光は、全反射ミラー４４Ｄでハーフミラー４２Ｄに向けて反射される。そして、反射された光は、ハーフミラー４２Ｄに入射する。そして、入射した光は、ハーフミラー４２Ｄで凹面鏡４３Ｄに向けて反射される。そして、反射された光は、凹面鏡４３Ｄに入射する。そして、入射した光は、凹面鏡４３Ｄでハーフミラー４２Ｄに向けて反射される。凹面鏡４３Ｄで反射された光は、略平行光となっている。そして、反射された光は、ハーフミラー４２Ｄに入射する。そして、光は、ハーフミラー４２Ｄを透過して乗員に到達する。 In the present embodiment, light emitted from the display 41D is incident on the total reflection mirror 44D. The incident light is reflected by the total reflection mirror 44D toward the half mirror 42D. Then, the reflected light is incident on the half mirror 42D. The incident light is reflected by the half mirror 42D toward the concave mirror 43D. And the reflected light injects into the concave mirror 43D. The incident light is reflected by the concave mirror 43D toward the half mirror 42D. The light reflected by the concave mirror 43D is substantially parallel light. Then, the reflected light is incident on the half mirror 42D. Then, the light passes through the half mirror 42D and reaches the occupant.
　上述したように、本実施形態によれば、図８に示すように、ディスプレイ４１Ｄとハーフミラー４２Ｄと凹面鏡４３Ｄと全反射ミラー４４Ｄとを配置することで、筐体４０Ｄの前後方向の幅Ｗ４１および上下方向の幅Ｗ４２を第一実施形態の筐体４０の前後方向の幅Ｗ１１および上下方向の幅Ｗ１２より小さくすることができる。 As described above, according to the present embodiment, as shown in FIG. 8, by arranging the display 41D, the half mirror 42D, the concave mirror 43D, and the total reflection mirror 44D, the width W41 in the front-rear direction of the housing 40D and The vertical width W42 can be made smaller than the front-rear width W11 and the vertical width W12 of the housing 40 of the first embodiment.
［第六実施形態］
　図９を参照しながら、本実施形態に係る車両用表示システム１Ｅについて説明する。図９は、第六実施形態に係る車両用表示装置の構成例を示す概略図である。 [Sixth embodiment]
A vehicle display system 1E according to the present embodiment will be described with reference to FIG. FIG. 9 is a schematic diagram illustrating a configuration example of the vehicle display device according to the sixth embodiment.
　本実施形態の車両用表示システム１Ｅは、車両用表示装置４Ｅを構成する光学素子の配置が、第五実施形態の車両用表示システム１Ｄの車両用表示装置４Ｄと異なる。 The vehicle display system 1E of the present embodiment is different from the vehicle display device 4D of the vehicle display system 1D of the fifth embodiment in the arrangement of optical elements constituting the vehicle display device 4E.
　車両用表示装置４Ｅは、ディスプレイ４１Ｅと、ハーフミラー４２Ｅと、凹面鏡４３Ｅと、全反射ミラー４４Ｅと、これらを収容する筐体４０Ｅとを有する。 The vehicle display device 4E includes a display 41E, a half mirror 42E, a concave mirror 43E, a total reflection mirror 44E, and a housing 40E that accommodates these.
　ディスプレイ４１Ｅは、表示面４１Ｅａが後下方に向いている。ディスプレイ４１Ｅの光軸Ａ１Ｅは、全反射ミラー４４Ｅを通るように配置されている。図９において、ディスプレイ４１Ｅは、光軸Ａ１Ｅが水平方向に対して角度θ９傾斜して配置されている。本実施形態では、角度θ９は、２５°である。ディスプレイ４１Ｅは、凹面鏡４３Ｅに対して前下方に配置されている。 The display surface 41Ea of the display 41E is directed downward and rearward. The optical axis A1E of the display 41E is disposed so as to pass through the total reflection mirror 44E. In FIG. 9, the display 41E is arranged such that the optical axis A1E is inclined at an angle θ9 with respect to the horizontal direction. In the present embodiment, the angle θ9 is 25 °. The display 41E is disposed on the front lower side with respect to the concave mirror 43E.
　ハーフミラー４２Ｅは、ディスプレイ４１Ｅに対して後上方、かつ、凹面鏡４３Ｅの後方に配置されている。ハーフミラー４２Ｅの表面４２Ｅａは、凹面鏡４３Ｅの表面４３Ｅａと向かい合って配置されている。ハーフミラー４２Ｅの表面４２Ｅａは、全反射ミラー４４Ｅの表面４４Ｅａと向かい合って配置されている。ハーフミラー４２Ｅは、凹面鏡４３Ｅの光軸Ａ２Ｅに対して角度θ１０傾斜して配置されている。ハーフミラー４２Ｅは、前方から後方に向かうにつれて、上方から下方に角度θ１０傾斜して配置されている。本実施形態では、角度θ１０は、５２．５°である。ハーフミラー４２Ｅの光軸Ａ３Ｅは、全反射ミラー４４Ｅの光軸と同軸である。ハーフミラー４２Ｅは、凹面鏡４３Ｅの光軸Ａ２Ｅ上に配置されている。凹面鏡４３Ｅの光軸Ａ２Ｅとハーフミラー４２Ｅの光軸Ａ３Ｅとは、ハーフミラー４２Ｅ上で交差している。図９において、ハーフミラー４２Ｅは、水平方向に対して５２．５°傾斜して配置されている。 The half mirror 42E is disposed rearward and upward with respect to the display 41E and behind the concave mirror 43E. The surface 42Ea of the half mirror 42E is disposed to face the surface 43Ea of the concave mirror 43E. The surface 42Ea of the half mirror 42E is disposed to face the surface 44Ea of the total reflection mirror 44E. The half mirror 42E is disposed at an angle of θ10 with respect to the optical axis A2E of the concave mirror 43E. The half mirror 42E is disposed so as to be inclined at an angle θ10 from the top to the bottom as it goes from the front to the rear. In the present embodiment, the angle θ10 is 52.5 °. The optical axis A3E of the half mirror 42E is coaxial with the optical axis of the total reflection mirror 44E. The half mirror 42E is disposed on the optical axis A2E of the concave mirror 43E. The optical axis A2E of the concave mirror 43E and the optical axis A3E of the half mirror 42E intersect on the half mirror 42E. In FIG. 9, the half mirror 42E is disposed at an angle of 52.5 ° with respect to the horizontal direction.
　凹面鏡４３Ｅは、ディスプレイ４１Ｅに対して後上方、かつ、ハーフミラー４２Ｅに対して前方に配置されている。凹面鏡４３Ｅの表面４３Ｅａは、ハーフミラー４２Ｅの表面４２Ｅａと向かい合って配置されている。凹面鏡４３Ｅの光軸Ａ２Ｅは、ディスプレイ４１Ｅの光軸Ａ１Ｅに対して傾斜して配置されている。凹面鏡４３Ｅの光軸Ａ２Ｅは、ハーフミラー４２Ｅの光軸Ａ３Ｅとハーフミラー４２Ｅ上で交差している。図９において、凹面鏡４３Ｅの光軸Ａ２Ｅは、水平方向に沿って平行に配置されている。 The concave mirror 43E is disposed rearward and upward with respect to the display 41E and forward with respect to the half mirror 42E. The surface 43Ea of the concave mirror 43E is disposed to face the surface 42Ea of the half mirror 42E. The optical axis A2E of the concave mirror 43E is arranged to be inclined with respect to the optical axis A1E of the display 41E. The optical axis A2E of the concave mirror 43E intersects the optical axis A3E of the half mirror 42E on the half mirror 42E. In FIG. 9, the optical axis A2E of the concave mirror 43E is arranged in parallel along the horizontal direction.
　全反射ミラー４４Ｅは、ディスプレイ４１Ｅに対して後下方、かつ、ハーフミラー４２Ｅに対して下方に配置されている。全反射ミラー４４Ｅの表面４４Ｅａは、ディスプレイ４１Ｅの表示面４１Ｅａと向かい合って配置されている。全反射ミラー４４Ｅの表面４４Ｅａは、ハーフミラー４２Ｅの表面４２Ｅａと向かい合って配置されている。全反射ミラー４４Ｅは、ディスプレイ４１Ｅの光軸Ａ１Ｅに対して角度θ１１傾斜して配置されている。本実施形態では、角度θ１１は、５０°である。全反射ミラー４４Ｅは、前方から後方に向かうにつれて、下方から上方に角度θ１１傾斜して配置されている。図９において、全反射ミラー４４Ｅは、水平方向に対して２５°傾斜して配置されている。 The total reflection mirror 44E is disposed rearward and downward with respect to the display 41E and downward with respect to the half mirror 42E. The surface 44Ea of the total reflection mirror 44E is disposed to face the display surface 41Ea of the display 41E. The surface 44Ea of the total reflection mirror 44E is disposed to face the surface 42Ea of the half mirror 42E. The total reflection mirror 44E is disposed at an angle θ11 with respect to the optical axis A1E of the display 41E. In the present embodiment, the angle θ11 is 50 °. The total reflection mirror 44E is disposed so as to be inclined at an angle θ11 from the bottom to the top as it goes from the front to the rear. In FIG. 9, the total reflection mirror 44E is disposed with an inclination of 25 ° with respect to the horizontal direction.
　筐体４０Ｅは、開口４０Ｅａを有する箱型に形成されている。筐体４０Ｅは、側壁４０Ｅｂと、側壁４０Ｅｂに対して傾斜して立設された側壁４０Ｅｃ、側壁４０Ｅｄと、側壁４０Ｅｃと直交して立設された側壁４０Ｅｅと、側壁４０Ｅｅに対して傾斜し、側壁４０Ｅｂと平行な方向に沿って配設された側壁４０Ｅｆと、側壁４０Ｅｆと直交して立設された側壁４０Ｅｇと、側壁４０Ｅｇと直交し、側壁４０Ｅｂと平行な方向に沿って配置された側壁４０Ｅｈと、側壁４０Ｅｄに対して傾斜して立設された側壁４０Ｅｉとを有する。開口４０Ｅａは、側壁４０Ｅｈと側壁４０Ｅｉとの間に形成されている。側壁４０Ｅｅに、ディスプレイ４１Ｅが配置されている。側壁４０Ｅｇと側壁４０Ｅｈとの内周面に配置されたコの字型の固定部４６Ｅで、凹面鏡４３Ｅが固定されている。側壁４０Ｅｄに、全反射ミラー４４Ｅが配置されている。開口４０Ｅａは、ハーフミラー４２Ｅで覆われている。本実施形態では、筐体４０Ｅは、前後方向の幅Ｗ５１が１４２．９５ｍｍ、上下方向の幅Ｗ５２が１２７ｍｍである。 The housing 40E is formed in a box shape having an opening 40Ea. The housing 40E is inclined with respect to the side wall 40Eb, the side wall 40Ec that is inclined to the side wall 40Eb, the side wall 40Ed, the side wall 40Ee that is orthogonal to the side wall 40Ec, and the side wall 40Ee, A side wall 40Ef disposed along a direction parallel to the side wall 40Eb, a side wall 40Eg erected perpendicular to the side wall 40Ef, and a side wall disposed perpendicular to the side wall 40Eg and parallel to the side wall 40Eb 40Eh, and a side wall 40Ei that stands upright with respect to the side wall 40Ed. The opening 40Ea is formed between the side wall 40Eh and the side wall 40Ei. A display 41E is disposed on the side wall 40Ee. The concave mirror 43E is fixed by a U-shaped fixing portion 46E disposed on the inner peripheral surfaces of the side wall 40Eg and the side wall 40Eh. A total reflection mirror 44E is disposed on the side wall 40Ed. The opening 40Ea is covered with a half mirror 42E. In the present embodiment, the casing 40E has a width W51 in the front-rear direction of 142.95 mm and a width W52 in the vertical direction of 127 mm.
　上述したように、本実施形態によれば、図９に示すように、ディスプレイ４１Ｅとハーフミラー４２Ｅと凹面鏡４３Ｅと全反射ミラー４４Ｅとを配置することで、筐体４０Ｅの上下方向の幅Ｗ５２を第五実施形態の筐体４０Ｄの上下方向の幅Ｗ４２より小さくすることができる。 As described above, according to the present embodiment, as shown in FIG. 9, by arranging the display 41E, the half mirror 42E, the concave mirror 43E, and the total reflection mirror 44E, the width W52 in the vertical direction of the housing 40E is increased. It can be made smaller than the vertical width W42 of the housing 40D of the fifth embodiment.
［第七実施形態］
　図１０を参照しながら、本実施形態に係る車両用表示システム１Ｆについて説明する。図１０は、第七実施形態に係る車両用表示装置の構成例を示す概略図である。 [Seventh embodiment]
A vehicle display system 1F according to the present embodiment will be described with reference to FIG. FIG. 10 is a schematic diagram illustrating a configuration example of the vehicle display device according to the seventh embodiment.
　本実施形態の車両用表示システム１Ｆは、車両用表示装置４Ｆがカバーガラス４５Ｆを備える点で、第一実施形態の車両用表示システム１の車両用表示装置４と異なる。本実施形態においては、車両用表示装置４Ｆの虚像距離を例えば１ｍとしている。 The vehicle display system 1F of the present embodiment is different from the vehicle display device 4 of the vehicle display system 1 of the first embodiment in that the vehicle display device 4F includes a cover glass 45F. In the present embodiment, the virtual image distance of the vehicle display device 4F is set to 1 m, for example.
　車両用表示装置４Ｆは、ディスプレイ４１Ｆと、ハーフミラー４２Ｆと、凹面鏡４３Ｆと、カバーガラス４５Ｆと、これらを収容する筐体４０Ｆとを有する。ディスプレイ４１Ｆとハーフミラー４２Ｆと凹面鏡４３Ｆとの構成は、第一実施形態のディスプレイ４１とハーフミラー４２と凹面鏡４３と同様である。 The vehicle display device 4F includes a display 41F, a half mirror 42F, a concave mirror 43F, a cover glass 45F, and a housing 40F that accommodates these. The configurations of the display 41F, the half mirror 42F, and the concave mirror 43F are the same as the display 41, the half mirror 42, and the concave mirror 43 of the first embodiment.
　カバーガラス４５Ｆは、直方体状の筐体４０Ｆの開口４０Ｆａを覆うように配置されている。カバーガラス４５Ｆは、ハーフミラー４２Ｆと乗員との間に配置される。カバーガラス４５Ｆは、ハーフミラー４２Ｆを透過した光を透過する。 The cover glass 45F is disposed so as to cover the opening 40Fa of the rectangular parallelepiped housing 40F. The cover glass 45F is disposed between the half mirror 42F and the occupant. The cover glass 45F transmits the light transmitted through the half mirror 42F.
　筐体４０Ｆは、開口４０Ｆａを有する直方体状の箱型に形成されている。筐体４０Ｆは、周囲の映り込みを防止するため、例えば、内部を黒色に着色するなどして反射防止を施している。 The housing 40F is formed in a rectangular parallelepiped box shape having an opening 40Fa. The housing 40F is provided with antireflection by, for example, coloring the inside black to prevent the surrounding reflection.
　上述したように、本実施形態によれば、筐体４０Ｆの開口４０Ｆａを覆うようにカバーガラス４５Ｆが配置されている。これにより、本実施形態は、ハーフミラー４２Ｆが外側に露出しないため、ハーフミラー４２Ｆへの映り込みを抑制することができる。本実施形態によれば、ハーフミラー４２Ｆが外側に露出しないため、ハーフミラー４２Ｆの汚れの付着を抑制することができる。 As described above, according to the present embodiment, the cover glass 45F is disposed so as to cover the opening 40Fa of the housing 40F. Thereby, since this embodiment does not expose the half mirror 42F to the outside, it is possible to suppress the reflection on the half mirror 42F. According to the present embodiment, since the half mirror 42F is not exposed to the outside, adhesion of dirt on the half mirror 42F can be suppressed.
［第八実施形態］
　図１１を参照しながら、本実施形態に係る車両用表示システム１Ｈについて説明する。図１１は、第八実施形態に係る車両用表示装置の構成例を示す概略図である。 [Eighth embodiment]
A vehicle display system 1H according to the present embodiment will be described with reference to FIG. FIG. 11 is a schematic diagram illustrating a configuration example of the vehicle display device according to the eighth embodiment.
　本実施形態の車両用表示システム１Ｈは、車両用表示装置４Ｈを構成する光学素子の配置が、第五実施形態の車両用表示システム１Ｄの車両用表示装置４Ｄと異なる。 The vehicle display system 1H of the present embodiment is different from the vehicle display device 4D of the vehicle display system 1D of the fifth embodiment in the arrangement of optical elements constituting the vehicle display device 4H.
　車両用表示装置４Ｈは、ディスプレイ４１Ｈと、偏光ビームスプリッタ（反射部）４２Ｈと、凹面鏡４３Ｈと、全反射ミラー４４Ｈと、波長板４７Ｈと、波長板４８Ｈと、これらを収容する筐体４０Ｈとを有する。 The vehicle display device 4H includes a display 41H, a polarizing beam splitter (reflecting unit) 42H, a concave mirror 43H, a total reflection mirror 44H, a wave plate 47H, a wave plate 48H, and a housing 40H that accommodates these. Have.
　ディスプレイ４１Ｈは、表示面４１Ｈａが下方に向いている。ディスプレイ４１Ｈの光軸Ａ１Ｈは、偏光ビームスプリッタ４２Ｈを通るように配置されている。図１１において、ディスプレイ４１Ｈは、光軸Ａ１Ｈが上下方向に沿って平行に配置されている。本実施形態では、ディスプレイ４１Ｈから発せられた光は、直線偏光である。ディスプレイ４１Ｈから発せられた光が無偏光であれば、ディスプレイ４１Ｈと偏光ビームスプリッタ４２Ｈとの間に偏光板を配置して直線偏光を取り出せばよい。 The display surface 41Ha of the display 41H faces downward. The optical axis A1H of the display 41H is arranged so as to pass through the polarization beam splitter 42H. In FIG. 11, the display 41H has an optical axis A1H arranged in parallel along the vertical direction. In the present embodiment, the light emitted from the display 41H is linearly polarized light. If the light emitted from the display 41H is non-polarized light, a polarizing plate may be disposed between the display 41H and the polarizing beam splitter 42H to extract linearly polarized light.
　偏光ビームスプリッタ４２Ｈは、ディスプレイ４１Ｈに対して下方に配置されている。本実施形態では、偏光ビームスプリッタ４２Ｈは、直交する２つの偏光成分であるｐ偏光とｓ偏光とに対して、ｓ偏光を透過させ、ｐ偏光を反射させる。偏光ビームスプリッタ４２Ｈは、ディスプレイ４１Ｈから発せられた光を全反射ミラー４４Ｈへ向けて透過させる。偏光ビームスプリッタ４２Ｈは、全反射ミラー４４Ｈで反射された光を凹面鏡４３Ｈに向けて反射する。偏光ビームスプリッタ４２Ｈは、平面状に形成されている。 The polarizing beam splitter 42H is disposed below the display 41H. In the present embodiment, the polarization beam splitter 42H transmits s-polarized light and reflects p-polarized light with respect to p-polarized light and s-polarized light that are two orthogonally polarized components. The polarization beam splitter 42H transmits the light emitted from the display 41H toward the total reflection mirror 44H. The polarization beam splitter 42H reflects the light reflected by the total reflection mirror 44H toward the concave mirror 43H. The polarization beam splitter 42H is formed in a planar shape.
　偏光ビームスプリッタ４２Ｈの表面４２Ｈａは、凹面鏡４３Ｈの表面４３Ｈａと向かい合って配置されている。偏光ビームスプリッタ４２Ｈの表面４２Ｈａは、全反射ミラー４４Ｈの表面４４Ｈａと向かい合って配置されている。偏光ビームスプリッタ４２Ｈは、凹面鏡４３Ｈの光軸Ａ２Ｈに対して角度θ１３傾斜して配置されている。偏光ビームスプリッタ４２Ｈは、前方から後方に向かうにつれて、上方から下方に角度θ１３傾斜して配置されている。本実施形態では、角度θ１３は、４５°である。偏光ビームスプリッタ４２Ｈの光軸は、ディスプレイ４１Ｈの光軸Ａ１Ｈ上に配置されている。偏光ビームスプリッタ４２Ｈは、凹面鏡４３Ｈの光軸Ａ２Ｈ上に配置されている。凹面鏡４３Ｈの光軸Ａ２Ｈと全反射ミラー４４Ｈの光軸Ａ１Ｈとは、偏光ビームスプリッタ４２Ｈ上で直交している。図１１において、偏光ビームスプリッタ４２Ｈは、水平方向に対して４５°傾斜して配置されている。 The surface 42Ha of the polarization beam splitter 42H is arranged to face the surface 43Ha of the concave mirror 43H. The surface 42Ha of the polarization beam splitter 42H is disposed to face the surface 44Ha of the total reflection mirror 44H. The polarization beam splitter 42H is disposed at an angle of θ13 with respect to the optical axis A2H of the concave mirror 43H. The polarization beam splitter 42H is arranged with an angle θ13 inclined from the top to the bottom as it goes from the front to the rear. In the present embodiment, the angle θ13 is 45 °. The optical axis of the polarization beam splitter 42H is disposed on the optical axis A1H of the display 41H. The polarization beam splitter 42H is disposed on the optical axis A2H of the concave mirror 43H. The optical axis A2H of the concave mirror 43H and the optical axis A1H of the total reflection mirror 44H are orthogonal to each other on the polarization beam splitter 42H. In FIG. 11, the polarization beam splitter 42H is disposed with an inclination of 45 ° with respect to the horizontal direction.
　凹面鏡４３Ｈは、ディスプレイ４１Ｈに対して下方、かつ、偏光ビームスプリッタ４２Ｈに対して前方に配置されている。凹面鏡４３Ｈの表面４３Ｈａは、偏光ビームスプリッタ４２Ｈの表面４２Ｈａと向かい合って配置されている。凹面鏡４３Ｈの光軸Ａ２Ｈは、ディスプレイ４１Ｈの光軸Ａ１Ｈと直交して配置されている。図１１において、凹面鏡４３Ｈの光軸Ａ２Ｈは、水平方向に沿って平行に配置されている。 The concave mirror 43H is disposed below the display 41H and ahead of the polarization beam splitter 42H. The surface 43Ha of the concave mirror 43H is disposed to face the surface 42Ha of the polarization beam splitter 42H. The optical axis A2H of the concave mirror 43H is arranged orthogonal to the optical axis A1H of the display 41H. In FIG. 11, the optical axis A2H of the concave mirror 43H is arranged in parallel along the horizontal direction.
　全反射ミラー４４Ｈは、ディスプレイ４１Ｈから発せられ、偏光ビームスプリッタ４２Ｈを透過した光を偏光ビームスプリッタ４２Ｈに向けて反射させる。全反射ミラー４４Ｈは、ディスプレイ４１Ｈに対して下方、かつ、偏光ビームスプリッタ４２Ｈに対して下方に配置されている。全反射ミラー４４Ｈの表面４４Ｈａは、ディスプレイ４１Ｈの表示面４１Ｈａと向かい合って配置されている。全反射ミラー４４Ｈの表面４４Ｈａは、偏光ビームスプリッタ４２Ｈの表面４２Ｈａと向かい合って配置されている。全反射ミラー４４Ｈの光軸は、ディスプレイ４１Ｈの光軸Ａ１Ｈと同軸である。全反射ミラー４４Ｈは、水平方向に沿って平行に配置されている。 The total reflection mirror 44H reflects the light emitted from the display 41H and transmitted through the polarization beam splitter 42H toward the polarization beam splitter 42H. The total reflection mirror 44H is disposed below the display 41H and below the polarization beam splitter 42H. The surface 44Ha of the total reflection mirror 44H is arranged to face the display surface 41Ha of the display 41H. The surface 44Ha of the total reflection mirror 44H is disposed so as to face the surface 42Ha of the polarization beam splitter 42H. The optical axis of the total reflection mirror 44H is coaxial with the optical axis A1H of the display 41H. The total reflection mirror 44H is arranged in parallel along the horizontal direction.
　波長板４７Ｈは、直線偏光に対しては電場と磁場とに位相差をつけ入射偏光の状態を変化させる。波長板４７Ｈは、１／４波長板である。波長板４７Ｈは、電場と磁場とにλ／４（９０°）の位相差を与える。波長板４７Ｈは、凹面鏡４３Ｈの表面４３Ｈａに貼付されている。 The wave plate 47H changes the state of incident polarized light by giving a phase difference between an electric field and a magnetic field for linearly polarized light. The wave plate 47H is a quarter wave plate. The wave plate 47H gives a phase difference of λ / 4 (90 °) to the electric field and the magnetic field. The wave plate 47H is affixed to the surface 43Ha of the concave mirror 43H.
　波長板４８Ｈは、電場と磁場とに位相差をつけ入射偏光の状態を変化させる。波長板４８Ｈは、１／４波長板である。波長板４８Ｈは、電場と磁場とにλ／４（９０°）の位相差を与える。波長板４８Ｈは、全反射ミラー４４Ｈの表面４４Ｈａに貼付されている。 The wave plate 48H changes the state of incident polarized light by making a phase difference between the electric field and the magnetic field. The wave plate 48H is a quarter wave plate. The wave plate 48H gives a phase difference of λ / 4 (90 °) to the electric field and the magnetic field. The wave plate 48H is affixed to the surface 44Ha of the total reflection mirror 44H.
　本実施形態において、ディスプレイ４１Ｈから発せられたｐ偏光は、偏光ビームスプリッタ４２Ｈを透過する。偏光ビームスプリッタ４２Ｈを透過したｐ偏光は、波長板４８Ｈへ入射する。そして、入射したｐ偏光は、波長板４８Ｈによって円偏光になる。円偏光は、全反射ミラー４４Ｈで反射し、再び波長板４８Ｈに入射して直線偏光に戻る。このとき、全反射ミラー４４Ｈで反射したことで円偏光の回転方向が逆向きになっているので位相が９０°回ったｓ偏光に変わる。位相が９０°回ったｓ偏光は、偏光ビームスプリッタ４２Ｈで反射して、波長板４７Ｈへ入射する。そして、入射したｓ偏光は、波長板４７Ｈによって円偏光になる。円偏光は、凹面鏡４３Ｈで反射し、再び波長板４７Ｈに入射して直線偏光に戻る。このとき、凹面鏡４３Ｈで反射したことで円偏光の回転方向が逆向きになっているので位相が９０°回ったｐ偏光に変わる。位相が９０°回ったｐ偏光は、偏光ビームスプリッタ４２Ｈを透過して乗員に到達する。 In this embodiment, the p-polarized light emitted from the display 41H is transmitted through the polarization beam splitter 42H. The p-polarized light that has passed through the polarization beam splitter 42H enters the wave plate 48H. The incident p-polarized light becomes circularly polarized light by the wave plate 48H. The circularly polarized light is reflected by the total reflection mirror 44H, enters the wave plate 48H again, and returns to linearly polarized light. At this time, since the rotation direction of the circularly polarized light is reversed due to reflection by the total reflection mirror 44H, the phase is changed to s-polarized light whose phase is rotated by 90 °. The s-polarized light whose phase is rotated by 90 ° is reflected by the polarization beam splitter 42H and enters the wave plate 47H. The incident s-polarized light becomes circularly polarized light by the wave plate 47H. The circularly polarized light is reflected by the concave mirror 43H, enters the wave plate 47H again, and returns to linearly polarized light. At this time, since the rotation direction of the circularly polarized light is reversed due to reflection by the concave mirror 43H, the phase is changed to p-polarized light whose phase is rotated by 90 °. The p-polarized light whose phase is rotated by 90 ° passes through the polarization beam splitter 42H and reaches the occupant.
　筐体４０Ｈは、開口４０Ｈａを有する箱型に形成されている。筐体４０Ｈは、側壁４０Ｈｂと、側壁４０Ｈｂと直交して立設された側壁４０Ｈｃと、側壁４０Ｈｃと直交して配置された側壁４０Ｈｄと、側壁４０Ｈｂと直交して立設された側壁４０Ｈｅとを有する。開口４０Ｈａは、側壁４０Ｈｄと側壁４０Ｈｅとの間に形成されている。側壁４０Ｈｂに、全反射ミラー４４Ｈが配置されている。側壁４０Ｈｃに、凹面鏡４３Ｈが配置されている。側壁４０Ｈｄに、ディスプレイ４１Ｈが配置されている。開口４０Ｈａは、偏光ビームスプリッタ４２Ｈで覆われている。本実施形態では、筐体４０Ｈは、前後方向の幅Ｗ６１が１００ｍｍ程度、上下方向の幅Ｗ６２が９０ｍｍ程度である。 The housing 40H is formed in a box shape having an opening 40Ha. The housing 40H includes a side wall 40Hb, a side wall 40Hc erected perpendicular to the side wall 40Hb, a side wall 40Hd arranged orthogonal to the side wall 40Hc, and a side wall 40He erected orthogonal to the side wall 40Hb. Have. The opening 40Ha is formed between the side wall 40Hd and the side wall 40He. A total reflection mirror 44H is disposed on the side wall 40Hb. A concave mirror 43H is disposed on the side wall 40Hc. A display 41H is disposed on the side wall 40Hd. The opening 40Ha is covered with a polarization beam splitter 42H. In the present embodiment, the housing 40H has a front-rear width W61 of about 100 mm and a vertical width W62 of about 90 mm.
　本実施形態において、ディスプレイ４１Ｈから発せられた光が偏光ビームスプリッタ４２Ｈを透過して全反射ミラー４４Ｈに入射する。そして、入射した光は、全反射ミラー４４Ｈで偏光ビームスプリッタ４２Ｈに向けて反射される。そして、反射された光は、偏光ビームスプリッタ４２Ｈに入射する。そして、入射した光は、偏光ビームスプリッタ４２Ｈで凹面鏡４３Ｈに向けて反射される。そして、反射された光は、凹面鏡４３Ｈに入射する。そして、入射した光は、凹面鏡４３Ｈで偏光ビームスプリッタ４２Ｈに向けて反射される。凹面鏡４３Ｈで反射された光は、略平行光となっている。そして、反射された光は、偏光ビームスプリッタ４２Ｈに入射する。そして、光は、偏光ビームスプリッタ４２Ｈを透過して乗員に到達する。 In this embodiment, light emitted from the display 41H passes through the polarization beam splitter 42H and enters the total reflection mirror 44H. The incident light is reflected by the total reflection mirror 44H toward the polarization beam splitter 42H. The reflected light enters the polarization beam splitter 42H. The incident light is reflected by the polarizing beam splitter 42H toward the concave mirror 43H. The reflected light is incident on the concave mirror 43H. The incident light is reflected by the concave mirror 43H toward the polarization beam splitter 42H. The light reflected by the concave mirror 43H is substantially parallel light. The reflected light enters the polarization beam splitter 42H. Then, the light passes through the polarization beam splitter 42H and reaches the occupant.
　上述したように、本実施形態によれば、図１１に示すように、ディスプレイ４１Ｈと偏光ビームスプリッタ４２Ｈと凹面鏡４３Ｈと全反射ミラー４４Ｈとを配置することで、ディスプレイ４１Ｈから凹面鏡４３Ｈに到達するまでの光路を、第一実施形態におけるディスプレイ４１Ｈから凹面鏡４３に到達するまでの光路の長さと同じ長さとすることができる。このように、本実施形態は、筐体４０Ｈの前後方向の幅Ｗ６１を第一実施形態の筐体４０の前後方向の幅Ｗ１１より小さくすることができる。 As described above, according to the present embodiment, as shown in FIG. 11, by disposing the display 41H, the polarization beam splitter 42H, the concave mirror 43H, and the total reflection mirror 44H, the display 41H reaches the concave mirror 43H. This optical path can be the same length as the length of the optical path from the display 41H to the concave mirror 43 in the first embodiment. Thus, this embodiment can make the width W61 of the housing | casing 40H of the front-back direction smaller than the width W11 of the housing | casing 40 of 1st embodiment.
　しかも、本実施形態では、光がハーフミラーを通らないため、乗員に到達するまでの光路における光量の低減を大幅に抑制することができる。 Moreover, in this embodiment, since the light does not pass through the half mirror, it is possible to greatly suppress the reduction in the amount of light in the optical path until it reaches the occupant.
　上記に記載した構成要素には、当業者が容易に想定できるもの、実質的に同一のものを含む。さらに、上記に記載した構成は適宜組み合わせが可能である。また、本発明の要旨を逸脱しない範囲において構成の種々の省略、置換または変更が可能である。 The constituent elements described above include those that can be easily assumed by those skilled in the art and those that are substantially the same. Furthermore, the structures described above can be appropriately combined. In addition, various omissions, substitutions, or changes in the configuration can be made without departing from the scope of the present invention.
　第一実施形態の車両用表示システム１の車両用表示装置４は、図１２に示すように、上下を逆にして配置し車両用表示システム１Ｇとしてもよい。図１２は、他の実施形態に係る車両用表示装置の構成例を示す概略図である。車両用表示装置４Ｇにおいては、虚像距離を例えば１ｍとしている。車両用表示装置４Ｇは、ディスプレイ４１Ｇと、ハーフミラー４２Ｇと、凹面鏡４３Ｇと、これらを収容する筐体４０Ｇとを有する。ディスプレイ４１Ｇとハーフミラー４２Ｇと凹面鏡４３Ｇとの構成は、第一実施形態のディスプレイ４１とハーフミラー４２と凹面鏡４３と同様である。このように配置することで、車両用表示装置４Ｇは、従来の光学式のルームミラーと同じように、車室の上部に配置することができる。 As shown in FIG. 12, the vehicle display device 4 of the vehicle display system 1 of the first embodiment may be arranged upside down to be a vehicle display system 1G. FIG. 12 is a schematic diagram illustrating a configuration example of a vehicle display device according to another embodiment. In the vehicle display device 4G, the virtual image distance is set to 1 m, for example. The vehicle display device 4G includes a display 41G, a half mirror 42G, a concave mirror 43G, and a housing 40G that accommodates these. The configuration of the display 41G, the half mirror 42G, and the concave mirror 43G is the same as the display 41, the half mirror 42, and the concave mirror 43 of the first embodiment. By arranging in this way, the vehicle display device 4G can be arranged in the upper part of the passenger compartment in the same manner as a conventional optical room mirror.
　第一実施形態の車両用表示システム１の車両用表示装置４において、凹面鏡４３を前後方向に位置調整可能とし、ディスプレイ４１までの光路長（バックフォーカス）を調節する調節部を備えてもよい。この場合、凹面鏡４３の位置に応じて、ディスプレイ４１に表示する映像の大きさを調節するようにしてもよい。これにより、乗員ごとに虚像距離を調整して視認しやすい位置に合わせることができる。 In the vehicle display device 4 of the vehicle display system 1 according to the first embodiment, the concave mirror 43 may be adjusted in the front-rear direction, and an adjustment unit that adjusts the optical path length (back focus) to the display 41 may be provided. In this case, the size of the image displayed on the display 41 may be adjusted according to the position of the concave mirror 43. Thereby, it is possible to adjust the virtual image distance for each occupant so that it can be easily seen.
　１　　　　車両用表示システム
　２　　　　後方カメラ
　３　　　　制御装置
　４　　　　車両用表示装置
　４０　　　筐体
　４１　　　ディスプレイ（表示器）
　４２　　　ハーフミラー（反射部）
　４３　　　凹面鏡
　Ａ１　　　光軸
　Ａ２　　　光軸 DESCRIPTION OF SYMBOLS 1 Display system for vehicles 2 Rear camera 3 Control apparatus 4 Display apparatus for vehicles 40 Case 41 Display (indicator)
42 Half mirror (reflective part)
43 Concave mirror A1 Optical axis A2 Optical axis

Claims (11)

  1. 　映像を表示する表示器と、
    　前記表示器に表示された前記映像を反射させる反射部と、
    　前記反射部で反射された前記映像を反射させる凹面鏡と
    　を備え、
    　前記反射部は、前記凹面鏡で反射された前記映像を透過し、
    　前記凹面鏡は、曲率中心が前記表示器と車両の乗員の視点との間の光軸上に配置されていることを特徴とする車両用表示装置。     A display for displaying images;
    A reflection part for reflecting the image displayed on the display;
    A concave mirror that reflects the image reflected by the reflecting portion, and
    The reflection part transmits the image reflected by the concave mirror,
    The concave mirror has a center of curvature disposed on an optical axis between the display and a viewpoint of a vehicle occupant.
  2. 　前記表示器と前記反射部と前記凹面鏡とが一体として組み付けられた筐体と、
    　前記乗員の視点に対する前記筐体の角度を調節する角度調節部を備え、
    　前記反射部は、前記角度調節部で前記筐体が第一所定位置に位置付けられた状態では、前記表示器に表示された前記映像を反射させて前記乗員に視認させ、前記角度調節部で前記筐体が前記第一所定位置と異なる第二所定位置に位置付けられた状態では、前記車両の後方の視界を反射させて前記乗員に視認させる請求項１に記載の車両用表示装置。     A housing in which the indicator, the reflecting portion, and the concave mirror are assembled together;
    An angle adjustment unit for adjusting an angle of the housing with respect to the viewpoint of the occupant;
    In the state where the casing is positioned at the first predetermined position by the angle adjustment unit, the reflection unit reflects the image displayed on the display unit so that the occupant can visually recognize the image, and the angle adjustment unit 2. The vehicle display device according to claim 1, wherein, in a state where the housing is positioned at a second predetermined position different from the first predetermined position, the field of view behind the vehicle is reflected so as to be visually recognized by the occupant.
  3. 　前記反射部は、ハーフミラーである請求項１または２に記載の車両用表示装置。 The vehicle display device according to claim 1, wherein the reflecting portion is a half mirror.
  4. 　前記反射部と前記凹面鏡との間の光軸上に配置された波長板を備え、
    　前記反射部は、偏光板である請求項１または２に記載の車両用表示装置。     Comprising a wave plate disposed on the optical axis between the reflecting portion and the concave mirror;
    The vehicle display device according to claim 1, wherein the reflection portion is a polarizing plate.
  5. 　前記表示器と前記反射部との間の光軸と前記反射部と前記凹面鏡との間の光軸とが前記反射部において交差している請求項１から４のいずれか一項に記載の車両用表示装置。 The vehicle according to any one of claims 1 to 4, wherein an optical axis between the display and the reflecting portion and an optical axis between the reflecting portion and the concave mirror intersect at the reflecting portion. Display device.
  6. 　前記表示器と前記反射部との間の光軸と前記反射部と前記凹面鏡との間の光軸とが前記反射部において直交している請求項５に記載の車両用表示装置。 The vehicle display device according to claim 5, wherein an optical axis between the display and the reflecting portion and an optical axis between the reflecting portion and the concave mirror are orthogonal to each other in the reflecting portion.
  7. 　前記反射部と前記凹面鏡との間の光軸上に配置された全反射ミラーを備え、
    　前記反射部は、前記表示器に表示された前記映像を前記全反射ミラーに向けて反射させ、
    　前記全反射ミラーは、前記反射部から入射した前記映像を前記凹面鏡に向けて反射させ、
    　前記凹面鏡は、前記全反射ミラーから入射した前記映像を前記全反射ミラーに向けて反射させ、
    　前記全反射ミラーは、前記凹面鏡から入射した前記映像を前記反射部に向けて反射させ、
    　前記反射部は、前記全反射ミラーから入射した前記映像を透過させる請求項１から４のいずれか一項に記載の車両用表示装置。     A total reflection mirror disposed on the optical axis between the reflecting portion and the concave mirror;
    The reflection unit reflects the image displayed on the display toward the total reflection mirror,
    The total reflection mirror reflects the image incident from the reflection portion toward the concave mirror,
    The concave mirror reflects the image incident from the total reflection mirror toward the total reflection mirror,
    The total reflection mirror reflects the image incident from the concave mirror toward the reflection unit,
    The vehicle display device according to claim 1, wherein the reflection unit transmits the image incident from the total reflection mirror.
  8. 　前記表示器と前記反射部との間の光軸上に配置された全反射ミラーを備え、
    　前記全反射ミラーは、前記表示器に表示された前記映像を前記反射部に向けて反射させ、
    　前記反射部は、前記全反射ミラーから入射した前記映像を前記凹面鏡に向けて反射させ、
    　前記凹面鏡は、前記反射部から入射した前記映像を前記反射部に向けて反射させ、
    　前記反射部は、前記凹面鏡から入射した前記映像を透過させる請求項１から４のいずれか一項に記載の車両用表示装置。     A total reflection mirror disposed on the optical axis between the display and the reflection unit;
    The total reflection mirror reflects the image displayed on the display toward the reflection unit,
    The reflection unit reflects the image incident from the total reflection mirror toward the concave mirror,
    The concave mirror reflects the image incident from the reflecting portion toward the reflecting portion,
    5. The vehicle display device according to claim 1, wherein the reflection unit transmits the image incident from the concave mirror. 6.
  9. 　前記表示器と前記反射部との間の光軸上に、前記反射部を間に挟んで、前記表示器と向かい合って配置された全反射ミラーを備え、
    　前記反射部は、前記表示器に表示された前記映像を前記全反射ミラーに向けて透過させ、
    　前記全反射ミラーは、前記反射部から入射した前記映像を前記反射部に向けて反射させ、
    　前記反射部は、前記全反射ミラーから入射した前記映像を前記凹面鏡に向けて反射させ、
    　前記凹面鏡は、前記反射部から入射した前記映像を前記反射部に向けて反射させ、
    　前記反射部は、前記凹面鏡から入射した前記映像を透過させる請求項１から６のいずれか一項に記載の車両用表示装置。     A total reflection mirror disposed on the optical axis between the display unit and the reflection unit and facing the display unit with the reflection unit interposed therebetween;
    The reflection unit transmits the image displayed on the display toward the total reflection mirror,
    The total reflection mirror reflects the image incident from the reflection unit toward the reflection unit,
    The reflection unit reflects the image incident from the total reflection mirror toward the concave mirror,
    The concave mirror reflects the image incident from the reflecting portion toward the reflecting portion,
    The vehicle display device according to claim 1, wherein the reflection unit transmits the image incident from the concave mirror.
  10. 　前記凹面鏡を前記乗員に対して近づけたり遠ざけたりして位置を調節する位置調節部を備える請求項１から９のいずれか一項に記載の車両用表示装置。 The vehicle display device according to any one of claims 1 to 9, further comprising a position adjusting unit that adjusts the position by moving the concave mirror closer to or away from the occupant.
  11. 　請求項１から１０のいずれか一項に記載の車両用表示装置と、
    　車両の後方を撮影する後方カメラと、
    　前記後方カメラで撮影された映像を取得し、前記表示器に表示させる制御装置と
    　を備えた車両用表示システム。     A vehicle display device according to any one of claims 1 to 10,
    A rear camera that captures the back of the vehicle;
    A vehicle display system comprising: a control device that acquires an image captured by the rear camera and displays the image on the display.
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