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WO2024195768A1 - Dispositif de projection d'image - Google Patents

Dispositif de projection d'image Download PDF

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Publication number
WO2024195768A1
WO2024195768A1 PCT/JP2024/010533 JP2024010533W WO2024195768A1 WO 2024195768 A1 WO2024195768 A1 WO 2024195768A1 JP 2024010533 W JP2024010533 W JP 2024010533W WO 2024195768 A1 WO2024195768 A1 WO 2024195768A1
Authority
WO
WIPO (PCT)
Prior art keywords
image
mirror
light
image projection
projection device
Prior art date
Application number
PCT/JP2024/010533
Other languages
English (en)
Japanese (ja)
Inventor
匡紘 堀
一臣 村上
憂士 森本
貴智 藤吉
秀樹 原
Original Assignee
株式会社小糸製作所
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 JP2023047417A external-priority patent/JP2024136331A/ja
Priority claimed from JP2023047419A external-priority patent/JP2024136333A/ja
Priority claimed from JP2023047418A external-priority patent/JP2024136332A/ja
Application filed by 株式会社小糸製作所 filed Critical 株式会社小糸製作所
Publication of WO2024195768A1 publication Critical patent/WO2024195768A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • B60K35/20—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor
    • B60K35/21—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor using visual output, e.g. blinking lights or matrix displays
    • B60K35/23—Head-up displays [HUD]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R11/00—Arrangements for holding or mounting articles, not otherwise provided for
    • B60R11/02—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof
    • 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 an image projection device.
  • dashboards that light up icons have been used as devices to display various types of information inside vehicles. As the amount of information to be displayed increases, it has also been proposed to embed an image display device in the dashboard or to configure the entire dashboard from an image display device.
  • HUDs head-up displays
  • the image projection unit projects light containing an image, which is then reflected by a free-form mirror or the like, and the light reaches the passenger's viewpoint so that the image is formed in space via a display unit such as a windshield. This allows the passenger to perceive the image as being displayed at the imaging position in the depth direction due to the light incident on the viewpoint.
  • Such image projection devices are often housed in the dashboard, below the windshield of the vehicle. In addition, they are usually placed in front of the driver's seat, as they project a virtual image toward the driver's viewpoint. However, the steering wheel and instruments are located between the driver's seat and the windshield, making it difficult to secure space to house the image projection device.
  • the present invention has been developed in consideration of the above-mentioned problems with the conventional technology, and aims to provide an image projection device that can be made compact by making effective use of space.
  • an image projection device is an image projection device that projects a projection image onto a display unit, and is characterized in that it includes an image irradiation unit that irradiates image light onto the display unit, a first mirror that reflects the image light irradiated from the image irradiation unit, and a second mirror that reflects the image light reflected by the first mirror, the area connecting both ends of the opposing first and second mirrors is an inter-mirror area, the image irradiation unit is biased to one side in the width direction of the inter-mirror area, and at least a portion of it is located within the inter-mirror area.
  • At least a portion of the image irradiation section is located within the inter-mirror area connecting both ends of the opposing first and second mirrors, making it possible to effectively utilize space and achieve miniaturization.
  • an image projection device is an image projection device that projects a projection image onto a display unit, and is characterized in that it includes an image irradiation unit that irradiates image light onto the display unit, a first mirror that reflects the image light irradiated from the image irradiation unit, a second mirror that reflects the image light reflected by the first mirror, and a control board that controls the image irradiation unit, and the first mirror is disposed between the control board and the image irradiation unit.
  • the first mirror is disposed between the control board and the image projection unit, making it possible to effectively utilize the space and achieve miniaturization.
  • an image projection device that projects a projection image onto a display unit, and includes an image irradiation unit that irradiates image light onto the display unit, a first mirror that reflects the image light irradiated from the image irradiation unit, a second mirror that reflects the image light reflected by the first mirror, and a light-shielding wall disposed between the first mirror and the second mirror, the light-shielding wall having an image light passing portion with a portion cut out, and the image light passing through the image light passing portion.
  • a light-shielding wall is disposed between the first and second mirrors, and image light passes through an image light passage provided in the light-shielding wall, making it possible to effectively utilize space and achieve miniaturization.
  • the present invention provides an image projection device that can be made compact by making effective use of space.
  • FIG. 1A is a diagram for explaining an image projection device 10 according to the first, third and fifth embodiments, and is a schematic diagram showing projection of a virtual image using the image projection device 10.
  • FIG. 1B is a schematic plan view showing an overview of the image projection device 10 shown in FIG. 1A.
  • FIG. 2A is a schematic top view showing an example of the structure of the image projection device 10 according to the first and third embodiments.
  • FIG. 2B is a schematic perspective view of the image projection device 10 shown in FIG. 2A.
  • FIG. 3A is a schematic perspective view showing an example of the internal structure of the image projection device 10 according to the first and third embodiments with the upper cover 110 removed.
  • FIG. 3B is a schematic top view showing an example of the internal structure of the image projection device 10 according to the first embodiment with the upper cover 110 removed.
  • FIG. 3C is a schematic perspective view showing an example of the internal structure of the image projection device 10 according to the first embodiment, with a part of the lower housing 100 cut away.
  • FIG. 4A is a side view seen from the rear side of the first mirror 12, showing the arrangement of the various members inside the image projection device 10 according to the first embodiment.
  • FIG. 4B is a perspective view of the first mirror 12 viewed obliquely from above, showing the arrangement of the various members inside the image projection device 10 shown in FIG. 4A.
  • FIG. 4A is a side view seen from the rear side of the first mirror 12, showing the arrangement of the various members inside the image projection device 10 according to the first embodiment.
  • FIG. 4B is a perspective view of the first mirror 12 viewed obliquely from above, showing the arrangement of the various members inside the image projection device 10 shown in FIG. 4A.
  • FIG. 5A is a schematic top view showing a passing area of the image light irradiated from the image irradiating unit 11 according to the first and fifth embodiments.
  • FIG. 5B is a side view seen from the rear surface side of the first mirror 12, showing a passing area of the image light irradiated from the image irradiating unit 11 shown in FIG. 5A.
  • FIG. 6 is a schematic perspective view showing the relationship between the image light passing area and the image light passing portion 113 in a state in which the upper cover 110 according to the first embodiment is assembled.
  • FIG. 7 is a schematic diagram illustrating the heights of the reflecting surfaces of the first mirror 12 and the second mirror 13 in the image projection device 10 according to the second embodiment.
  • FIG. 8A is a schematic top view showing an example of the internal structure of the image projection device 10 according to the third embodiment with the upper cover 110 removed.
  • FIG. 8B is a schematic perspective view showing an example of the internal structure of the image projection device 10 according to the third embodiment, with a part of the lower housing 100 cut away.
  • FIG. 9A is a side view seen from the rear side of the first mirror 12, showing the arrangement of the various members inside the image projection device 10 according to the third embodiment.
  • FIG. 9B is a perspective view of the first mirror 12 from diagonally above, showing the arrangement of the various members inside the image projection device 10 shown in FIG. 9A.
  • FIG. 10A is a schematic cross-sectional view showing the arrangement of the wiring cable 16 that connects between the image projection unit 11 and the control board 15 according to the third embodiment.
  • FIG. 10B is a schematic top view showing the arrangement of the distribution cables 16 shown in FIG. 10A.
  • FIG. 11 is a schematic top view showing an example of the structure of an image projection device 10 according to the fifth embodiment.
  • FIG. 12A is a schematic perspective view illustrating an example of the internal structure of the image projection device 10 according to the fifth embodiment with the upper cover 110 removed.
  • FIG. 12B is a schematic top view showing an example of the internal structure of the image projection device 10 shown in FIG. 12A with the upper cover 110 removed.
  • FIG. 13 is a schematic perspective view showing the relationship between the image light passing area and the image light passing portion 113 in a state in which the upper cover 110 is assembled in the fifth embodiment.
  • FIG. 14A is a schematic diagram showing an example of an image light passing portion 113 formed in a light-shielding wall 112 according to the sixth embodiment, the image light passing portion 113 having an arc shape.
  • FIG. 14B is a schematic diagram showing an example of the image light passing portion 113 formed in the light-shielding wall 112 according to the sixth embodiment, the image light passing portion 113 having a trapezoidal shape.
  • FIG. 14C is a schematic diagram showing an example of the image light passing portion 113 formed in the light blocking wall 112 according to the sixth embodiment, the image light passing portion 113 having a triangular shape.
  • Figures 1A and 1B are diagrams for explaining an image projection device 10 according to this embodiment, where Figure 1A is a schematic diagram showing the projection of a virtual image using the image projection device 10, and Figure 1B is a schematic plan view showing an overview of the image projection device 10.
  • the solid lines shown in Figures 1A and 1B indicate the optical path of image light.
  • the dashed and dotted lines shown in Figure 1B indicate the area through which light passes.
  • the direction perpendicular to the paper surface is the X-axis direction, which corresponds to the left-right direction of the vehicle
  • the left-right direction of the paper surface is the Y-axis direction, which corresponds to the front-rear direction of vehicle 1
  • the up-down direction of the paper surface is the Z-axis direction, which corresponds to the up-down direction of vehicle 1.
  • the direction perpendicular to the paper surface is the Z-axis direction, which corresponds to the up-down direction of vehicle 1
  • the left-right direction of the paper surface is the Y-axis direction, which corresponds to the front-rear direction of vehicle 1
  • the up-down direction of the paper surface is the X-axis direction, which corresponds to the left-right direction of vehicle 1.
  • the image projection device 10 is mounted on a vehicle 1, and the image light projected from the image projection device 10 is reflected by the windshield (display unit) WS and irradiated to the driver's viewpoint.
  • the driver visually recognizes a virtual image P formed on an extension of the optical path along which the image light is incident.
  • the image projection device 10 includes an image projection unit 11, a first mirror 12, and a second mirror 13.
  • each part is controlled using a control unit that is connected to each part so that information can be communicated.
  • the configuration of the control unit is not limited, but one example includes a CPU (Central Processing Unit) for information processing, a memory device, a recording medium, an information communication device, etc.
  • the control unit controls the operation of each part according to a predetermined program, and sends information including an image (image information) to the image projection unit 11.
  • the image irradiation unit 11 is a part that irradiates the first mirror 12 with light containing an image as image light based on image information from the control unit.
  • the configuration of the image irradiation unit 11 is not limited, and may include a combination of a backlight and an image display unit.
  • the backlight is a part that irradiates the image display unit with irradiation light, and for example, a device that irradiates light using a light-emitting diode (LED) can be used.
  • the image display unit is a part that displays a projected image in response to an image signal from the control unit.
  • the projection image displayed on the image display unit is irradiated with irradiation light from the backlight, and image light is irradiated from the image display unit.
  • the specific configuration of the image display unit is not limited, and for example, a liquid crystal display device or the like can be used.
  • the first mirror 12 is an optical member that reflects the image light arriving from the image irradiation unit 11 toward the second mirror 13.
  • the concave shape of the first mirror 12 is a free-form mirror or the like in which the curvature of the concave surface is not constant.
  • the second mirror 13 is an optical member that reflects the image light arriving from the first mirror 12 in the direction of the windshield WS.
  • the second mirror 13 corresponds to the exit mirror in the present invention, since it projects the image light onto the windshield WS, which is the display unit.
  • the second mirror 13 is a free-form mirror with a concave shape that has been optically designed to project the image light as a virtual image P.
  • the second mirror 13 is rotatable around a predetermined rotation axis, and the reflection direction of the image light in the height direction is variable. Therefore, the second mirror 13 is capable of adjusting the angle and position of incidence of the image light with respect to the windshield WS.
  • the reflective surfaces of the first mirror 12 and the second mirror 13 are designed to expand the light diameter in the driver's viewpoint direction in order to project the image light as a virtual image P through the windshield WS. Therefore, the combination of the first mirror 12 and the second mirror 13 corresponds to the projection optical unit in this invention.
  • the expansion of the light diameter in the viewpoint direction includes not only the case where the light diameter consistently expands after reflection, but also the case where the light diameter shrinks and expands after forming an image at an intermediate point.
  • the windshield WS is a part that is provided in front of the driver's seat of the vehicle 1 and transmits visible light.
  • the windshield WS corresponds to the display unit in the present invention because the windshield WS reflects the image light incident from the image projection device 10 toward the viewpoint on the inside surface of the vehicle 1 and transmits light from outside the vehicle 1 toward the viewpoint.
  • the windshield WS is composed of a free-form surface, so its curvature changes and is not constant in the height direction.
  • a combiner may be provided as a display unit separate from the windshield WS and reflect light from the image projection device 10 toward the viewpoint.
  • the display unit is not limited to being located in front of the vehicle 1, and may be located to the side or rear as long as it projects an image toward the passenger's viewpoint.
  • the virtual image P is an image that appears as if it is formed in space when the image light reflected by the windshield WS reaches the passenger's viewpoint (eyebox).
  • the position where the virtual image P is formed is determined by the composite focal length of the projection optical unit included in the image projection device 10 and the windshield WS.
  • the optical path at the center position of the image light is drawn as a single straight line by a solid line.
  • the actual image light is displayed with a predetermined area in the image projection unit 11, and has a predetermined area in the direction perpendicular to the traveling direction.
  • the dashed line in FIG. 1B the area through which the image light with area passes is reflected by the first mirror 12 and travels while the light diameter in the width direction (X-axis direction) is reduced, and an intermediate image is formed between the first mirror 12 and the second mirror 13, and reaches the second mirror 13.
  • the image light reflected by the first mirror 12 reaches the second mirror 13 without forming an intermediate image.
  • the area indicated by the dashed line in Figure 1B is the inter-mirror area connecting the upper and lower ends of the opposing first mirror 12 and second mirror 13.
  • the image projection unit 11 is positioned offset to one side in the width direction of the inter-mirror area and is located within the inter-mirror area.
  • the area indicated by the dashed dotted line in Figure 1B is the light passage area through which the image light passes, and an intermediate image is formed in the width direction, so that even if the image projection unit 11 is located in the inter-mirror area, the image light is not blocked by the image projection unit 11.
  • the optical path at the center position of the image light is such that an acute angle is formed between the image projection unit 11 and the first mirror 12, and between the first mirror 12 and the second mirror 13, as shown by the solid line in Figure 1B.
  • FIGS. 2A and 2B are diagrams showing an example of the structure of the image projection device 10 according to this embodiment, with FIG. 2A being a schematic top view and FIG. 2B being a schematic perspective view.
  • the image projection device 10 includes a lower housing 100, an upper cover 110, and an actuator 120.
  • the lower housing 100 is a member that forms the lower part of the housing that constitutes the external shape of the image projection device 10.
  • the lower housing 100 has a bottom surface and side walls, and each part of the image projection device 10 is housed in the space formed by the bottom surface and the side walls.
  • multiple mounting parts are provided on the side walls of the lower housing 100, making it possible to fix the image projection device 10 to an installation position on the vehicle side using fastening members or the like.
  • an actuator 120 is attached to the outside of the lower housing 100.
  • the upper cover 110 is a member that forms the upper part of the housing that constitutes the external shape of the image projection device 10.
  • the upper cover 110 has a top surface and a peripheral portion, and the external shape of the peripheral portion corresponds to the side wall of the lower housing 100.
  • the lower housing 100 and the upper cover 110 are combined to constitute the external shape of the image projection device 10, and house the image irradiation unit 11, the first mirror 12, the second mirror 13, and each part described below, shown in FIG. 1B.
  • FIG. 2B an example of an uneven shape that reflects the shapes of each part housed inside is shown as the shape of the top surface of the upper cover 110, but a flat top surface or a curved top surface may also be used.
  • the upper cover 110 is also provided with an opening 111, a light-shielding wall 112, and an image light passing part 113.
  • the opening 111 is an opening provided on the top surface of the upper cover 110. As shown in FIG. 2A, the reflective surface of the second mirror 13 and the light-shielding wall 112 are visible from the opening 111. Therefore, the image light reflected by the second mirror 13 is irradiated to the outside of the image projection device 10 through the opening 111. Since the opening 111 is a portion for irradiating the image light, the opening 111 may be covered with a translucent cover member.
  • the light-shielding wall 112 is a wall for blocking light provided from the opening 111 of the upper cover 110 toward the lower housing 100.
  • FIG. 2A shows an example in which the light-shielding wall 112 is provided at an angle from one side of the opening 111 close to the first mirror 12 toward the center. A part of the light-shielding wall 112 is cut out to provide an image light passing section 113.
  • the image light passing section 113 is a cutout provided in a part of the light-shielding wall 112, and is an area through which the image light can pass.
  • the specific shape of the image light passing section 113 is not limited, but the space through which the image light passes, taking into account three-dimensional considerations, has been removed from the light-shielding wall 112.
  • the image light passing section 113 is disposed at the intermediate image-forming position of the image light, and an example is shown in which it has a distorted trapezoidal shape.
  • the actuator 120 is a part that supplies power to rotate the second mirror 13.
  • the actuator 120 is attached to the lower housing 100, and the movable part is inserted into the lower housing 100 through a through hole provided in the lower housing 100.
  • the specific configuration of the actuator 120 is not limited, but a configuration that uses an electric motor and rack gear, etc., to reciprocate the movable part based on power and control signals shared from the outside can be used.
  • Figures 3A to 3C are diagrams showing an example of the internal structure of the image projection device 10 according to this embodiment, with Figure 3A being a schematic perspective view showing the state with the upper cover 110 removed, Figure 3B being a schematic top view showing the state with the upper cover 110 removed, and Figure 3C being a schematic perspective view showing a part of the lower housing 100 broken away.
  • the lower housing 100 in addition to the image irradiation unit 11, first mirror 12, and second mirror 13, the lower housing 100 also contains a pivot arm 14 and a control board 15. Also, a light-shielding member 101 is disposed on the bottom surface of the lower housing 100.
  • the rotating arm 14 is connected to one end of the second mirror 13 and is a member for rotating the second mirror 13 around the rotation axis.
  • a movable part of the actuator 120 is connected to one end of the rotating arm 14.
  • the other end of the rotating arm 14 is supported so that it can rotate around the rotation axis.
  • the control board 15 is a part on which a wiring pattern is formed and on which electronic components and terminals are mounted, and which controls the driving of the image projection unit 11 and the actuator 120.
  • the specific configuration of the control board 15 is not limited, but a printed wiring board or the like can be used in which wiring is patterned on the surface of a flat board made of glass epoxy.
  • the control board 15 is equipped with a terminal section to which a wiring cable is connected, enabling the transmission of power and control signals between the image projection device 10 and the outside.
  • wiring cables or the like are connected between the image projection unit 11 and the actuator 120 and the control board 15, enabling the transmission of power and control signals.
  • the light-shielding member 101 is made of a light-shielding material and is a generally plate-shaped member that is provided along the bottom surface of the lower housing 100. One side of the light-shielding member 101 is extended to form a light-shielding inclined surface portion 102 and a light-shielding lower surface portion 103, and a part of the light-shielding member 101 is erected to form a mirror front light-shielding portion 104 and a light-shielding wall portion 105.
  • the first mirror 12 is disposed on the light-shielding member 101
  • the second mirror 13 is disposed on the light-shielding lower surface portion 103.
  • the light-shielding member 101 is shown to have a shape that follows the bottom surface of the lower housing 100, but the shape is not limited as long as a predetermined space can be provided between the bottom surface and the light-shielding member 101.
  • the light-shielding inclined surface portion 102 is made of a light-shielding material and is formed integrally with the light-shielding member 101, and is a portion that slopes downward from the first mirror 12 side toward the second mirror 13 side.
  • the light-shielding lower surface portion 103 is formed by extending from the end of the light-shielding inclined surface portion 102 on the second mirror 13 side.
  • the light-shielding lower surface portion 103 is made of a light-shielding material and is formed by extending from the light-shielding inclined surface portion 102, and is provided below the second mirror 13. Since the light-shielding lower surface portion 103 extends from the lowest position of the light-shielding inclined surface portion 102, it is disposed with a step between it and the surface of the light-shielding member 101 on which the first mirror 12 is mounted. Although an example in which the light-shielding lower surface portion 103 has a flat shape is shown in FIG. 3A and FIG. 3B, the specific shape is not limited.
  • the light-shielding member 101 is provided with the light-shielding inclined surface portion 102, and the light-shielding lower surface portion 103 is formed by extending from the light-shielding inclined surface portion 102, so that the light-shielding lower surface portion 103 can be provided at a position lower than the first mirror 12, and a space for the second mirror 13 to rotate can be secured.
  • the pre-mirror light shielding portion 104 is a portion made of a light-shielding material and erected on the light shielding member 101.
  • the pre-mirror light shielding portion 104 is provided between the image irradiation portion 11 and the lower portion of the first mirror 12, and limits the area where the image light is incident on the first mirror 12.
  • the shape of the pre-mirror light shielding portion 104 may be shaped to fit the lower portion of the first mirror 12, to support the positioning and holding of the first mirror 12.
  • the light-shielding wall 105 is a part made of a light-shielding material and erected on the light-shielding member 101.
  • the light-shielding wall 105 prevents stray light, which is unintended light, from entering the first mirror 12 or the second mirror 13.
  • a part extending in the horizontal direction is provided at the top of the light-shielding wall 105.
  • the light-shielding wall 105 is provided on the opposite side of the image irradiation unit 11 between the first mirror 12 and the second mirror 13, generally along the inter-mirror region.
  • the light-shielding wall 105 is preferably provided in a position where light can easily enter from the outside, and one example is the periphery of the position where the movable part of the actuator 120 is inserted.
  • the light-shielding wall 105 is erected from the light-shielding member 101, but it may be extended downward from the upper cover 110.
  • FIGS. 4A and 4B show the arrangement of each component inside image projection device 10, with FIG. 4A being a side view from the rear side of first mirror 12 and FIG. 4B being a perspective view from diagonally above first mirror 12.
  • Actuator 120 has movable part 121, the tip of which is connected to the tip of pivot arm 14. Note that for simplicity, illustrations of light-shielding member 101, light-shielding inclined surface portion 102, light-shielding bottom surface portion 103, mirror front light-shielding portion 104 and light-shielding wall portion 105 are omitted in FIGS. 4A and 4B.
  • the image projection unit 11, first mirror 12, second mirror 13, and control board 15 are arranged on the XY plane (horizontal direction) in FIG. 1B.
  • the inter-mirror area forms a three-dimensional space connecting the four corners of the opposing first mirror 12 and second mirror 13.
  • the image projection unit 11 is positioned offset to the right in the width direction (horizontal direction) of the three-dimensional inter-mirror area, and at least a portion of it is located within the inter-mirror area.
  • an example is shown in which the image projection unit 11 is positioned offset to the right, but the arrangement of each part may be reversed left to right.
  • the first mirror 12 is a free-form mirror whose curvature varies depending on the position on the reflective surface, and the curvature in the width direction and the curvature in the height direction at each position also vary. Furthermore, the height of the first mirror 12 is not constant, being lower on the side closer to the image irradiation unit 11 and higher on the side farther from the image irradiation unit 11.
  • the second mirror 13 is also a free-form mirror whose curvature varies depending on the position on the reflective surface. Since the second mirror 13 reflects image light onto the windshield WS, it is preferable to make the height approximately constant in order to reduce distortion of the image light.
  • FIG. 5A and 5B are diagrams showing the passing area of the image light irradiated from the image irradiation unit 11, where FIG. 5A is a schematic top view and FIG. 5B is a side view from the back side of the first mirror 12.
  • the area shown by the two-dot chain line in FIG. 5A and FIG. 5B shows the passing area of the image light.
  • the image light irradiated from the image irradiation unit 11 is reflected by the reflective surface of the first mirror 12 and reaches the reflective surface of the second mirror 13.
  • the image light is reflected by the second mirror 13 and irradiated in the direction of the windshield WS, but is not shown in FIG. 5A and FIG. 5B for simplicity.
  • the image light from the image irradiation unit 11 is irradiated to the first mirror 12 with its light diameter expanding in the height direction and the width direction.
  • the image light irradiated from the image display unit of the image irradiation unit 11 is rectangular and is irradiated obliquely to the first mirror 12. Therefore, the irradiation area of the image light on the reflection surface of the first mirror 12 is approximately trapezoidal as shown in FIG. 5B.
  • the four corners are points A, B, C, and D, respectively.
  • point A is located at the upper left
  • point B is located at the lower left
  • point C is located at the lower right
  • point D is located at the upper right on the reflection surface of the first mirror 12.
  • the reflection surface of the first mirror 12 satisfies the relationship Hn ⁇ Hf, where Hn is the height (distance between points C and D) on the side closer to the image irradiation unit 11 and Hf is the height (distance between points A and B) on the side farther from the image irradiation unit 11.
  • the image light reflected by the first mirror 12 forms an intermediate image at an intermediate image position in the horizontal direction, but reaches the second mirror 13 without forming an intermediate image in the vertical direction. Therefore, the irradiation area of the image light on the reflecting surface of the second mirror 13 is swapped in the left-right direction as shown in Figure 5A. Therefore, on the reflecting surface of the first mirror 12, point A is located at the upper right, point B is located at the lower right, point C is located at the lower left, and point D is located at the upper left.
  • the area through which the image light passes has the smallest horizontal cross-sectional area (light diameter) at the intermediate imaging position, and the light diameter expands toward the second mirror 13. Therefore, even if part of the image projection unit 11 is located in the area between the mirrors, the area through which the image light passes and the image projection unit 11 do not overlap, and the image light is not blocked by the image projection unit 11. This makes it possible to effectively utilize the space within the image projection device 10 and to miniaturize the image projection device.
  • the optical path of the image light from the image projection unit 11 to the first mirror 12 and the optical path of the image light from the first mirror 12 to the second mirror 13 can be reflected at an acute angle. This reduces distortion of the projection area of the image light on the reflecting surface of the first mirror 12, making the optical design easier.
  • the image projection unit 11 is arranged offset to one side in the horizontal direction, and the image light is intermediately imaged in the horizontal direction by the first mirror 12, so that the incidence angle and reflection angle of the image light in the horizontal direction are different at each position.
  • the reflecting surface of the first mirror 12 satisfies the relationship Rn ⁇ Rf, where Rn is the radius of curvature on the side closer to the image projection unit 11 in the width direction, and Rf is the radius of curvature on the side farther from the image projection unit 11.
  • the radius of curvature in the horizontal direction of point D is smaller than the radius of curvature in the horizontal direction of point A
  • the radius of curvature in the horizontal direction of point C is smaller than the radius of curvature in the horizontal direction of point B.
  • the image light irradiated from the image irradiation unit 11 is irradiated to the first mirror 12 while expanding in the height direction.
  • the image light irradiated from the image irradiation unit 11 is irradiated to the first mirror 12 at an elevation angle with respect to the center position, the incidence angle and reflection angle of the image light in the horizontal direction differ at each position.
  • the reflection surface of the first mirror 12 satisfies the relationship Ru>Rb, where the radius of curvature in the horizontal direction on the upper side is Ru and the radius of curvature in the horizontal direction on the lower side is Rb.
  • the radius of curvature at point B is smaller than the radius of curvature at point A, and the radius of curvature at point C is smaller than the radius of curvature at point D.
  • FIG. 6 is a schematic perspective view showing the relationship between the image light passing area and the image light passing section 113 when the upper cover 110 is assembled.
  • a light-shielding wall 112 is provided between the first mirror 12 and the second mirror 13 within the opening 111 of the upper cover 110.
  • the light-shielding wall 112 is provided at a downward incline, and the image light passes through the image light passing section 113 to reach the second mirror 13.
  • the light-shielding walls 112 are located on both sides of the intermediate image position in the horizontal direction of the image light, and the intermediate image position is located near the image light passing section 113.
  • the cross-sectional area of the image light at the intermediate image position can be reduced, and the area of the image light passing section 113 can be reduced. This increases the area that can be blocked by the light-shielding wall 112, and reduces the amount of external light that reaches the image irradiation section 11.
  • the light-shielding wall 112 is formed integrally with the upper cover 110, it becomes easier to align the light-shielding wall 112 and the image light passing section 113.
  • the image irradiation unit 11 is located within the inter-mirror area connecting both ends of the opposing first mirror 12 and second mirror 13, making it possible to effectively utilize space and achieve miniaturization.
  • FIG. 7 is a schematic diagram for explaining the heights of the reflection surface of the first mirror 12 and the reflection surface of the second mirror 13 in the image projection device 10 according to this embodiment.
  • the area shown by the two-dot chain line in FIG. 7 indicates the irradiation area where the image light is irradiated on the first mirror 12.
  • the irradiation area of the image light on the first mirror 12 is trapezoidal, and the height on the side farther from the image irradiation unit 11 is larger than the closer side.
  • the maximum height H1max on the reflection surface of the first mirror 12 is the height on the side farther from the image irradiation unit 11.
  • the curved shape of the first mirror 12 and the angle of incidence of the image light cause the illuminated area to have curved top and bottom sides.
  • the outline of the reflecting surface of the first mirror 12 (the illuminated area of the image light) is drawn as straight lines in Figure 7, but the outline of the illuminated area may also be curved.
  • the maximum height of the reflecting surface of the first mirror 12 is defined as H1max.
  • the maximum height of the reflecting surface of the second mirror 13 is defined as H2max.
  • the ratio of H1max to H2max is preferably in the range of 0.5 ⁇ H1max/H2max ⁇ 1.5.
  • the ratio of H1max to H2max is preferably in the range of 0.5 ⁇ H1max/H2max ⁇ 1.5.
  • Figures 8A and 8B are diagrams showing an example of the internal structure of the image projection device 10 according to the third embodiment, in which Figure 8A is a schematic top view showing a state in which the upper cover 110 is removed, and Figure 8B is a schematic perspective view showing a part of the lower housing 100 broken away.
  • the lower housing 100 of the image projection device 10 according to the third embodiment contains the image irradiation unit 11, the first mirror 12, and the second mirror 13, as well as the rotating arm 14, the control board 15, and the wiring cable 16.
  • FIG. 9A is a side view from the rear side of the first mirror 12, showing the arrangement of each component inside the image projection device 10 according to the third embodiment.
  • FIG. 9B is a perspective view from diagonally above the first mirror 12, showing the arrangement of each component inside the image projection device 10 shown in FIG. 9A.
  • the control board 15 is equipped with a terminal portion 15a, and a wiring cable 16 is connected to the terminal portion 15a, enabling the transmission of power and control signals between the image projection device 10 and the outside.
  • a wiring cable 16 is connected between the image irradiation unit 11 and the actuator 120, and the control board 15, enabling the transmission of power and control signals.
  • the wiring cable 16 is a part that electrically connects multiple electronic circuits to transmit power and control signals. As shown in Figures 8B, 9A, and 9B, one end of the wiring cable 16 is connected to the terminal portion 15a of the control board 15, and the other end is connected to the image projection unit 11.
  • the specific configuration of the wiring cable 16 is not limited, but a cable made up of multiple coated copper wires or a flexible cable in which a wiring layer is formed on a flexible board can be used.
  • the image projection unit 11, the first mirror 12, the second mirror 13, and the control board 15 are arranged on the bottom surface of the lower housing 100.
  • the first mirror 12 is arranged between the control board 15 and the image projection unit 11.
  • the first mirror 12 is arranged on the light shielding member 101 along the mirror front light shielding unit 104.
  • the control board 15 is arranged on the opposite side (back side) of the reflection surface of the first mirror 12, between the side wall of the lower housing 100 and the first mirror 12, facing the image projection unit 11.
  • the control board 15 and the first mirror 12 are both erected on the bottom surface of the lower housing 100.
  • FIGS. 10A and 10B are schematic diagrams showing the arrangement of the wiring cable 16 connecting the image projection unit 11 and the control board 15 according to the third embodiment, with FIG. 10A being a schematic cross-sectional view and FIG. 10B being a schematic top view. Note that in FIG. 10B, the light-shielding member 101 and the member that holds the light-shielding member 101 are omitted for simplicity.
  • the image projection unit 11, the first mirror 12, and the control board 15 are disposed on the bottom surface 100a of the lower housing 100.
  • the first mirror 12 may be disposed on the light shielding member 101.
  • the light shielding member 101 is held at a position a predetermined distance from the bottom surface 100a by a holding member (not shown), and a space 100b is secured between the bottom surface 100a and the first mirror 12, and between the bottom surface 100a and the light shielding member 101.
  • a wiring cable 16 is disposed in the space 100b, and electrically connects the terminal portion 15a of the control board 15 and the terminal portion 11a of the image projection unit 11.
  • the wiring cable 16 electrically connects the opposing image projection unit 11 and the control board 15, and the first mirror 12 is arranged with a space 100b between it and the bottom surface 100a, and is located above the wiring cable 16.
  • the control board 15 is erected and faces the image projection unit 11, so that the wiring cable 16 can be connected in a straight line. This reduces the space occupied by the wiring cable 16, making it possible to effectively utilize the space and reduce the size of the image projection device 10.
  • the wiring cable 16 is accommodated in the space 100b provided between the bottom surface 100a of the lower housing 100, the first mirror 12, and the light shielding member 101. This effectively prevents the wiring cable 16 from interfering with the area through which the image light passes and hindering the irradiation of the image light.
  • the image projection unit 11, the first mirror 12, and the control board 15 are arranged on the bottom surface 100a of the lower housing 100 is shown, but these members may be arranged on other members.
  • any or all of the image projection unit 11, the first mirror 12, and the control board 15 may be arranged on the light-shielding member 101.
  • the wiring cable 16 is arranged in the space 100b provided between the bottom surface 100a of the lower housing 100 and the first mirror 12 and the light-shielding member 101 to connect the image projection unit 11 and the control board 15.
  • Fig. 11 is a schematic top view showing a structural example of an image projection device 10 according to the fifth embodiment.
  • the light-shielding member 101 of the image projection device 10 according to the fifth embodiment is extended to have a light-shielding inclined surface portion 102 and a light-shielding lower surface portion 103.
  • the upper cover 110 is provided with an opening 111, a light-shielding wall 112, and an image light passing portion 113.
  • FIG. 12A is a schematic perspective view showing an example of the internal structure of the image projection device 10 according to the fifth embodiment with the top cover 110 removed.
  • FIG. 12B is a schematic top view showing an example of the internal structure of the image projection device 10 shown in FIG. 12A with the top cover 110 removed.
  • the light-shielding wall portion 105 is a portion made of a light-shielding material and erected on the light-shielding member 101.
  • the light-shielding wall portion 105 prevents stray light, which is unintended light, from entering the first mirror 12 or the second mirror 13. Therefore, the light-shielding wall portion 105 is a light-shielding member separate from the light-shielding wall 112. In the example shown in FIGS.
  • the light-shielding wall portion 105 has a wall portion 105a extending vertically and a horizontal portion 105b extending horizontally from the upper portion of the wall portion 105a.
  • the light-shielding wall 105 is provided on the side opposite the image irradiation unit 11 between the first mirror 12 and the second mirror 13, generally along the inter-mirror region.
  • the light-shielding wall 105 is preferably provided in a position where light can easily enter from the outside, such as around the position where the movable part of the actuator 120 is inserted.
  • an example is shown in which the light-shielding wall 105 is erected from the light-shielding member 101, but it may also be extended downward from the upper cover 110.
  • the image projection unit 11, the first mirror 12, the second mirror 13, and the control board 15 are arranged on the bottom surface of the lower housing 100.
  • the first mirror 12 is arranged between the control board 15 and the image projection unit 11.
  • the first mirror 12 is arranged along the pre-mirror light shielding portion 104 on the light shielding member 101.
  • the control board 15 is arranged on the opposite side (back side) to the reflective surface of the first mirror 12, between the side wall of the lower housing 100 and the first mirror 12, facing the image projection unit 11.
  • the control board 15 and the first mirror 12 are both erected on the bottom surface of the lower housing 100.
  • FIG. 13 is a schematic perspective view showing the relationship between the image light passing area and the image light passing section 113 in the state where the upper cover 110 is assembled in the fifth embodiment.
  • the image light passing section 113 in the fifth embodiment is trapezoidal with oblique sides 113a and 113b so that the width increases downward. This is because the light-shielding wall 112 is inclined downward toward the second mirror 13.
  • the image light passing area is minimized in the width direction at the intermediate imaging position due to intermediate imaging as shown in FIG. 5A and FIG. 13, and there is no intermediate imaging in the height direction. Therefore, by forming the image light passing section 113 so that the oblique sides 113a and 113b are located slightly outside the image light passing area in FIG. 13, it is possible to prevent stray light and block external light while minimizing the area of the image light passing section 113.
  • the image light reflected by the second mirror 13 travels diagonally upward through the opening 111, by tilting the light-shielding wall 112 downward toward the second mirror 13, it is possible to prevent the light-shielding wall 112 from interfering with the image light and to block external light over the widest area.
  • a light-shielding wall 112 is disposed between the first mirror 12 and the second mirror 13, and image light passes through an image light passing section 113 provided in the light-shielding wall 112, making it possible to effectively utilize space and achieve miniaturization.
  • Fig. 14A is an example of the image light passing portion 113 formed on the light-shielding wall 112, and is a schematic diagram showing the image light passing portion 113 in an arc shape.
  • Fig. 14B is an example of the image light passing portion 113 formed on the light-shielding wall 112, and is a schematic diagram showing the image light passing portion 113 in a trapezoid shape.
  • Fig. 14C is an example of the image light passing portion 113 formed on the light-shielding wall 112, and is a schematic diagram showing the image light passing portion 113 in a triangular shape.
  • the image light passing portion 113 may have arc-shaped oblique sides 113a, 113b. This makes it possible to accommodate cases where the outer shape of the passing area of the image light reflected by the first mirror 12 is curved. Also, by ensuring a margin between the passing area of the image light and the image light passing portion 113, it is possible to prevent the image light from interfering with the light-shielding wall 112.
  • the image light passing portion 113 may be trapezoidal having oblique sides 113a and 113b and an apex 113c.
  • the apex 113c By providing the apex 113c, the light shielding wall 112 and the image light passing portion 113 can be positioned slightly different from the intermediate imaging position, improving the degree of freedom in design.
  • the image light passing portion 113 may be triangular in shape having hypotenuses 113a and 113b. Since the hypotenuses 113a and 113b intersect at a vertex angle, the intermediate imaging position and the vertex angle of the image light passing portion 113 can be made to coincide, thereby minimizing the area of the image light passing portion 113.
  • An image projection device that projects a projection image onto a display unit, an image irradiating unit that irradiates the display unit with image light;
  • a first mirror that reflects the image light irradiated from the image irradiating unit;
  • a second mirror that reflects the image light reflected by the first mirror, an area connecting both ends of the first mirror and the second mirror facing each other is defined as an inter-mirror area;
  • the image projection device wherein the image projection unit is arranged biased to one side in a width direction of the inter-mirror area, and at least a portion of the image projection unit is located within the inter-mirror area.
  • (Item 2) 2. The image projection device according to item 1, wherein the first mirror forms an intermediate image of the image light in a width direction in the inter-mirror region and causes the image light to reach the second mirror without forming an intermediate image in a height direction.
  • (Item 3) The image projection device according to claim 1, wherein the reflective surface of the first mirror has a radius of curvature Rn on a side closer to the image irradiation unit in the width direction and a radius of curvature Rf on a side farther from the image irradiation unit, such that Rn ⁇ Rf.
  • (Item 4) 4. The image projection device according to item 3, wherein the reflective surface of the first mirror satisfies a relationship of Ru>Rb, where Ru is a radius of curvature in the horizontal direction on the upper side and Rb is a radius of curvature in the horizontal direction on the lower side.
  • An image projection device that projects a projection image onto a display unit, an image irradiating unit that irradiates the display unit with image light; A first mirror that reflects the image light irradiated from the image irradiating unit; a second mirror that reflects the image light reflected by the first mirror; A control board for controlling the image irradiation unit is provided, The first mirror is disposed between the control board and the image projection unit.
  • an area connecting both ends of the first mirror and the second mirror facing each other is defined as an inter-mirror area; 8.
  • the image irradiation unit is arranged offset to one side in the width direction of the inter-mirror area, and at least a portion of the image irradiation unit is located within the inter-mirror area.
  • the image projection unit, the first mirror, the second mirror, and the control board are disposed on a bottom surface of a housing, 9.
  • the control board and the first mirror are provided upright relative to the bottom surface.
  • (Item 11) a wiring cable electrically connecting the image projection unit and the control board; Item 11.
  • An image projection device that projects a projection image onto a display unit, an image irradiating unit that irradiates the display unit with image light; A first mirror that reflects the image light irradiated from the image irradiating unit; a second mirror that reflects the image light reflected by the first mirror; a light blocking wall disposed between the first mirror and the second mirror, the light-shielding wall has an image light passing portion that is partially cut out, The image projection device, wherein the image light passes through the image light passing portion.
  • the first mirror forms an intermediate image of the image light at an intermediate image-forming position in the width direction and does not form an intermediate image in the height direction; Item 14.
  • (Item 15) a lower housing that houses the image irradiation unit, the first mirror, and the second mirror; an upper cover that covers the lower housing, Item 15.
  • the upper cover has an opening through which the image light reflected by the second mirror passes; Item 16.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Projection Apparatus (AREA)

Abstract

L'invention concerne un dispositif de projection d'image qui projette une image de projection sur une partie d'affichage (WS), le dispositif de projection d'image étant caractérisé en ce qu'il comprend une partie d'irradiation d'image (11) qui rayonne une lumière d'image vers la partie d'affichage (WS), un premier miroir (12) qui réfléchit la lumière d'image rayonnée à partir de la partie d'irradiation d'image, et un second miroir (13) qui réfléchit la lumière d'image réfléchie par le premier miroir (12), la partie d'irradiation d'image étant disposée de façon à être sollicitée vers un côté dans la direction de la largeur d'une région inter-miroir, la région inter-miroir étant une région reliant les deux extrémités du premier miroir (12) et du second miroir (13) se faisant face, et au moins une partie de la partie d'irradiation d'image étant positionnée à l'intérieur de la région inter-miroir.
PCT/JP2024/010533 2023-03-23 2024-03-18 Dispositif de projection d'image WO2024195768A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP2023047417A JP2024136331A (ja) 2023-03-23 2023-03-23 画像投影装置
JP2023-047419 2023-03-23
JP2023047419A JP2024136333A (ja) 2023-03-23 2023-03-23 画像投影装置
JP2023047418A JP2024136332A (ja) 2023-03-23 2023-03-23 画像投影装置
JP2023-047417 2023-03-23
JP2023-047418 2023-03-23

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WO2024195768A1 true WO2024195768A1 (fr) 2024-09-26

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015082019A (ja) * 2013-10-22 2015-04-27 日本精機株式会社 ヘッドアップディスプレイ装置
WO2016076342A1 (fr) * 2014-11-12 2016-05-19 日本精機株式会社 Dispositif d'affichage tête haute
WO2018061745A1 (fr) * 2016-09-30 2018-04-05 日本精機株式会社 Dispositif d'affichage tête haute
WO2019202864A1 (fr) * 2018-04-18 2019-10-24 マクセル株式会社 Affichage tête haute
CN212125017U (zh) * 2020-03-18 2020-12-11 浙江零跑科技有限公司 一种ar-hud装置
WO2021241497A1 (fr) * 2020-05-26 2021-12-02 日本精機株式会社 Dispositif d'affichage tête haute
WO2022209792A1 (fr) * 2021-03-31 2022-10-06 株式会社小糸製作所 Dispositif de génération d'image, dispositif d'irradiation d'image équipé dudit dispositif de génération d'image, et dispositif d'irradiation d'image
JP2022156070A (ja) * 2021-03-31 2022-10-14 株式会社小糸製作所 画像投影装置

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015082019A (ja) * 2013-10-22 2015-04-27 日本精機株式会社 ヘッドアップディスプレイ装置
WO2016076342A1 (fr) * 2014-11-12 2016-05-19 日本精機株式会社 Dispositif d'affichage tête haute
WO2018061745A1 (fr) * 2016-09-30 2018-04-05 日本精機株式会社 Dispositif d'affichage tête haute
WO2019202864A1 (fr) * 2018-04-18 2019-10-24 マクセル株式会社 Affichage tête haute
CN212125017U (zh) * 2020-03-18 2020-12-11 浙江零跑科技有限公司 一种ar-hud装置
WO2021241497A1 (fr) * 2020-05-26 2021-12-02 日本精機株式会社 Dispositif d'affichage tête haute
WO2022209792A1 (fr) * 2021-03-31 2022-10-06 株式会社小糸製作所 Dispositif de génération d'image, dispositif d'irradiation d'image équipé dudit dispositif de génération d'image, et dispositif d'irradiation d'image
JP2022156070A (ja) * 2021-03-31 2022-10-14 株式会社小糸製作所 画像投影装置

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