JP6337466B2 - Virtual image display device - Google Patents

Description

  The present invention relates to a virtual image display device suitable for a head-mounted display that presents an image formed by an image display element or the like to an observer.

  Various optical systems have been proposed as an optical system incorporated in a virtual image display device such as a head-mounted display (hereinafter also referred to as HMD) that is worn on the observer's head (for example, see Patent Document 1).

  As for a virtual image display device such as an HMD, it is desired to achieve a wide angle of view without degrading image quality while progressing downsizing and weight reduction. In addition, for example, by using a see-through that allows images to be seen over the outside world, new uses such as virtual reality are created. For this reason, a display capable of displaying video light in an overlapping manner without disturbing the visual field on the outside world side is desired.

  On the other hand, even if see-through is possible as described above, there may be a case where the user wants to observe an image in a state where the field of view on the outside world side is blocked to some extent due to the brightness of the outside world and the high degree of interest in the image. In such a case, for example, by adding a shade that covers the front part of the eye and suppresses the light transmittance, it is possible to adjust the field of view on the outside. That is, depending on the presence or absence of the shade, the observer can select the see-through state or degree according to his / her wish. At this time, it is particularly desirable to attach and detach the shade while maintaining the stability at the time of wearing and being able to perform the attaching / detaching operation easily without taking time and effort.

JP 2013-200553 A

  An object of this invention is to provide the virtual image display apparatus which can perform attachment or detachment of a shade easily.

  A virtual image display device according to the present invention includes at least one of a video element that generates video light, a light guide member that guides video light from the video element, a frame that supports the light guide member, and a light guide member. A shade that is attached so as to cover the front part of the eye in the viewing direction, the shade has a protrusion for removably attaching to the frame, and the frame has an insertion part for inserting the protrusion of the shade The projection is inserted into the insertion portion and the shade is fixed.

  In the virtual image display device, the shade projection can be mounted (fixed) by inserting the projection of the shade into the insertion portion for attaching / detaching the shade provided on the frame on the main body side. For removing the shade, for example, the entire shade may be pulled out from the insertion portion in the direction opposite to that when the shade is attached. As described above, in the virtual image display device, the shade can be easily attached and detached, for example, with one hand.

  In a specific aspect of the present invention, the light guide member is a prism-type member that guides the image light and allows the external light to be seen through. In this case, in the light guide member, it is possible to view an image and visually recognize an external image by external light passing through the light guide member.

  In another aspect of the present invention, when the shade is attached, the insertion portion is disposed at a central portion between the light guide members disposed in a pair of left and right of the frame portion. In this case, since the shade can be fixed at the insertion portion arranged at one place in the central portion, the workability of removal is improved.

  In still another aspect of the present invention, the frame portion includes an engaging portion that engages the protruding portion inserted from the inserting portion and fixes the shade. Here, the engagement includes, for example, a case where one is fitted to the other, that is, a case where the one is fitted, a case where the flexible member is fixed using a repulsive force generated by warping, and the like. In this case, for example, the projection can be inserted into the insertion portion, and further pushed to set the engagement portion to form an engagement state, and the shade can be securely fixed by mounting (fixing) the shade. . In addition, for removing the shade, for example, the entire shade may be pulled in a direction opposite to the direction pushed in at the time of mounting to release the engagement, and the protruding portion may be extracted from the insertion portion.

  In yet another aspect of the present invention, the projection of the shade is disposed on the distal end side, extends along a direction corresponding to the direction in which the frame portion extends, and is inserted into and connected to the insertion portion of the frame portion. A connecting portion; and a tip supporting portion that supports the tip connecting portion. In the frame portion, the engaging portion forms a cut portion or a notch portion into which the tip supporting portion is inserted, and a tip connecting portion. And a hook portion for hooking and fitting the portions. In this case, the projection of the shade can be reliably engaged with the engaging portion, and the entire shade can be reliably fixed.

  In still another aspect of the present invention, the frame portion includes a metal frame and a resin portion extending along the frame, the insertion portion is formed along with the frame, and the engagement portion is a resin portion. It is formed incidentally. In this case, it is possible to make the insertion portion easy to be fitted when the shade is attached by providing the engagement portion with flexibility while giving the insertion portion rigidity.

  In still another aspect of the present invention, in the frame portion, the insertion portion is disposed on a side far from a position assumed as the position of the observer's eye, and the engagement portion is relatively positioned on the observer. It is arranged on the side close to the position assumed as the position of the eye. In this case, the shade can be attached and detached while the virtual image display device is mounted.

  In still another aspect of the present invention, the projection portion of the shade is formed of a flexible member. In this case, by allowing the deformation of the protrusion, it is possible to easily perform the insertion or fitting operation when attaching the shade.

  In still another aspect of the present invention, a light transmissive member is further provided that allows external light and video light to be visually recognized by being bonded to the light guide member. In this case, it is possible to achieve a see-through state in which external light and video light are superimposed by the light guide member and the light transmitting member.

  In still another aspect of the present invention, the light guide member includes four or more surfaces as the plurality of optical surfaces, and the first surface and the third surface of the plurality of optical surfaces are arranged to face each other, The image light from the image element is totally reflected by the third surface, totally reflected by the first surface, reflected by the second surface, and then transmitted through the first surface to reach the observation side, and the light guide member The first surface and the third surface are substantially parallel planes. In this case, the diopter error can be made substantially zero with respect to the external light observed through the first surface and the third surface, and in particular, the apparent magnification error with respect to the external image is made substantially zero, and the naked eye state Can be close to.

1 is a perspective view for briefly explaining the appearance of a virtual image display device according to an embodiment of the present invention. (A) is a perspective view explaining briefly the external appearance of the virtual image display apparatus of the state which attached the shade, (B) is a perspective view shown from another angle. It is a perspective view which shows the internal structure which removed the exterior member from the virtual image display apparatus. (A) is a top view which shows the external appearance of a virtual image display apparatus, (B) is a front view, (C) is a side view. (A) is a perspective view of a shade, (B) is a perspective view at another angle of the shade, (C) is a front view of the shade, and (D) is a left side view of the shade. (E) is a right side view of the shade, and (F) is a rear view of the shade. It is a sectional side view of a virtual image display apparatus. (A) shows a state in which the projection of the shade is applied to the insertion part of the attachment part in the attachment of the shade, (B) shows a state in which the projection of the shade is inserted, and (C) shows It is a figure which shows the state which engaged the shade in the engaging part of the attaching part. (A) is a perspective view which shows the operation | movement which inserts the projection part of a shade, (B) is a perspective view which shows the operation | movement which engages the projection part of a shade, (C) is engaged. It is a perspective view which shows the fitting state of the projection part and engagement part of a state. It is a figure shown about the optical path of the image light in a virtual image display apparatus. It is a front view which shows the virtual image display apparatus of one modification. (A) is a conceptual perspective view shown about an example of the shade in the virtual image display apparatus of one modification, (B) is a conceptual top view of (A).

  Hereinafter, an embodiment of a light guide device according to the present invention and a virtual image display device including the light guide device will be described in detail with reference to FIG. 1 and the like.

  As shown in FIG. 1, the virtual image display device 100 including the light guide device of the present embodiment is a head-mounted display having an appearance like glasses, and for an observer or a user wearing the virtual image display device 100. Thus, image light (video light) based on a virtual image can be visually recognized, and an external image can be visually confirmed or observed by an observer. Further, as shown in FIGS. 2A and 2B, the virtual image display device 100 enables attachment of a shade 90 that is a flexible member formed of a light-blocking or light-absorbing resin material or the like. Yes. That is, the virtual image display device 100 can adjust the field of view on the outside side with respect to see-through by making the shade 90 detachable. The virtual image display device 100 is simply referred to as the virtual image display device 100 even when the shade 90 is removed. However, when the presence or absence of the shade 90 is a problem, the shade 90 The virtual image display device 100 having no image is called a main body portion of the virtual image display device 100.

  Returning to FIG. 1, the virtual image display device 100 includes first and second optical members 101 a and 101 b that cover the front of the eye, which is one of the viewing directions of the observer, and a frame that supports both optical members 101 a and 101 b. Part 102 and first and second image forming main body parts 105a and 105b added to the part extending from the left and right ends of frame part 102 to the rear temple part (temple) 104. Here, the first display device 100A in which the first optical member 101a on the left side and the first image forming main body portion 105a in the drawing are combined is a portion that forms a virtual image for the right eye, and can be used alone as a virtual image display device. Function. The virtual image display device 100 has a small camera CA that can perform an imaging operation in the side portion, and further has a display lamp LM near the camera CA to indicate that the camera CA is operating. Yes. Further, the second display device 100B in which the second optical member 101b on the right side in the drawing and the second image forming main body portion 105b are combined is a portion that forms a virtual image for the left eye, and functions alone as a virtual image display device. To do.

  FIG. 3 shows an internal structure of the virtual image display device 100. By comparing FIG. 3 with FIG. 1, the appearance and the inside of the virtual image display device 100 are compared. For example, the first and second image forming main body portions 105 a and 105 b are respectively constituted by the projection lens 30 housed in the lens barrel portion 39 and an image display device 80 including a video display element (video element) 82.

  As shown in each drawing from FIG. 1 to FIG. 4, the frame 102 provided in the virtual image display device 100 is disposed on the back side along the frame 107 disposed on the upper end side and the frame 107. The resin part 108 is provided. The virtual image display device 100 has a configuration without a frame-like portion on the lower side. The frame 107 constituting the frame portion 102 is an elongated plate-like member bent in a U-shape, and includes a front portion 107a extending in the left and right lateral directions, which are corresponding directions of the eyes for the observer, and the observer. A pair of side surface portions 107b and 107c extending in the depth direction corresponding to the front and rear directions. The frame 107, that is, the front surface portion 107a and the side surface portions 107b and 107c are metal integrated parts formed of aluminum die casting or other various metal materials. The resin portion 108 is disposed along the frame 107 on the inner side of the frame 107, that is, on the side closer to the observer. By fitting with the frame 107, the resin portion 108 cooperates therewith to store various cables for image formation, for example. It is possible. In the frame 107, the width in the depth direction of the front portion 107a and the resin portion 108 is approximately the same as the thickness or width of the light guide device 20 corresponding to the first and second optical members 101a and 101b. The first optical member 101a and the first image forming main body portion 105a are aligned on the left side of the frame 107, specifically, the portion from the left end portion to the side surface portion 107b toward the front surface portion 107a, and directly by, for example, screwing It is supported by being fixed. In addition, the second optical member 101b and the second image forming main body 105b are aligned on the right side of the frame 107, specifically, the portion from the right end portion to the side surface portion 107c toward the front portion 107a, for example, by screwing. It is supported by being directly fixed by. The first optical member 101a and the first image forming body 105a are aligned with each other by fitting, and the second optical member 101b and the second image forming body 105b are aligned with each other by fitting.

  The frame 107 and the resin portion 108 constituting the frame portion 102 not only support the first and second image forming main body portions 105a and 105b, but also cooperate with a cover-like exterior member 105d that covers them. It has a role of protecting the inside of the second image forming main body portions 105a and 105b. The frame 107 excludes the first and second optical members 101a and 101b connected to the first and second image forming main body portions 105a and 105b or the base side of the light guide device 20 arranged in a pair on the left and right. Spacing or loosely contacting the upper portion. For this reason, even if there is a difference in thermal expansion coefficient between the central light guide device 20 and the frame portion 102 including the frame 107, the light guide device 20 is allowed to expand within the frame portion 102, and the light guide It is possible to prevent the device 20 from being distorted, deformed, or damaged.

  A nose receiving portion 40 is provided along with the frame portion 102. The nose receiving portion 40 has a role of supporting the frame portion 102 by coming into contact with the observer's nose. That is, the frame portion 102 is disposed in front of the observer's face by the nose support portion 40 supported by the nose and the pair of temple portions 104 supported by the ears. The nose receiving portion 40 is fixed to the front portion 107a of one frame 107 constituting the frame portion 102 by screwing (details will be described later). In addition, the external appearance shown with reference to FIG. 1 as mentioned above is an example, and it is possible to change the design appropriately for a portion that is not directly involved as an optical mechanism such as a mechanism fixed by screwing, for example. It is.

  As shown in FIG. 3 and the like, the first display device 100A can be viewed as including a projection see-through device 70 that is a projection optical system and an image display device 80 that forms image light. The projection see-through device 70 has a role of projecting the image formed by the image display device 80 as a virtual image onto the observer's eyes. The projection see-through device 70 includes the first optical member 101a or the light guide device 20 and the projection lens 30 for image formation. The first optical member 101a or the light guide device 20 includes a light guide member 10 for light guide and see-through and a light transmitting member 50 for see-through. The first image forming main body portion 105 a includes the image display device 80 and the projection lens 30. In addition, the projection lens 30 configured by the lens group is housed by the lens barrel portion 39 and is fixed in a state where the projection lens 30 is accurately positioned with the light guide device 20 by fitting at the end portion 39t of the lens barrel portion 39. ing.

  The image display device 80 includes a video display element (video element) 82 which is a transmissive spatial light modulation device, as well as an illumination device (non-display) which is a backlight for emitting illumination light to the video display element 82, as will be described in detail later. And a drive control unit (not shown) for controlling the operation of the video display element 82 and the like.

  As described above, the light guide device 20 includes the light guide member 10 for light guide and see-through and the light transmitting member 50 for see-through. The light guide member 10 is a part of the prism type light guide device 20 and is an integral member, but is divided into a first light guide portion 11 on the light exit side and a second light guide portion 12 on the light incident side. Can be captured. The light transmission member 50 is a member (auxiliary optical block) that assists the see-through function of the light guide member 10, and is fixed integrally with the light guide member 10 to form one light guide device 20. Of the light guide device 20 having the above configuration, the distal end portion 12j located on the light source side (base side) is fitted to the end portion 39t of the lens barrel portion 39, so that the projection lens 30 is positioned and fixed with high accuracy. Has been.

  For example, as shown in FIG. 1, FIG. 3B, or FIGS. 4A to 4C, among the optical surfaces constituting the light guide device 20, the first exposed surface on the front side (outer side). The first exposed surface 20a and the second exposed surface 20b, which is the exposed surface on the back side (inner side), are exposed to the outside and affect the see-through function. The first exposed surface 20a includes a third surface S13 of the optical surfaces of the light guide member 10 and a third transmissive surface S53 which is an optical surface of the light transmissive member 50, and the second exposed surface 20b is a light guide. The optical surface of the member 10 includes the third surface S11 and the fourth surface S14, and the optical surface of the light transmission member 50 includes the first transmission surface S51. Of these, the first exposed surface 20a is covered with the shade 90, so that the amount of external light transmitted is adjusted.

  Hereinafter, the details of the structure of the shade 90 and the attachment portion 109 to which the shade 90 is attached will be described with reference to FIGS. 5 (A) and 5 (B) are perspective views showing the shade 90. FIG. 5 (C) is a front view, 5 (D) is a left side view, 5 (E) is a right side view, and 5 (F) is a rear view. FIG. 6 is a side cross-sectional view of the virtual image display device 100 with the shade 90 attached, cut along the central portion. As shown in the figure, the shade 90 includes a plate-like main body portion 90a and a protrusion 91 for supporting and fixing the main body portion 90a in a state where the main body portion 90a is disposed in front of the eyes of the virtual image display device 100. The protrusion 91 is a flexible member that is integrally formed with the main body portion 90a, and includes a distal end coupling portion TC disposed on the distal end side and a distal end support portion TS that supports the distal end coupling portion TC. As shown in FIG. 5 and FIG. 8C, the tip connecting portion TC in the protrusion 91 is in a direction corresponding to the direction in which the frame 107 constituting the frame 102 extends (the horizontal direction in which the eyes are lined up). It is a bar-like (plate-like) member extending along the tip support portion TS and extends from the center of the tip connecting portion TC and is connected to the main body portion 90a of the shade 90. Note that, as shown in FIG. 5B and the like, projections (or projections) at four corners corresponding to the outside of the optically effective area of the light guide device 20 on the back side surface of the shade 90. PT is formed. The protrusion PT is formed so as to protrude from the back side surface of the shade 90 toward the front side surface of the light guide device 20, and comes into contact with a peripheral surface located outside the optically effective area when attached. ing. Thereby, even if the shade 90 has flexibility, the shade 90 can be positioned while avoiding contact with each other by providing a gap of a certain degree or more between the shade 90 and the light guide device 20. it can.

  Hereinafter, the attachment part 109 for attaching the shade 90 provided in the frame part 102 in the main body portion of the virtual image display device 100 and the surrounding structure will be described. The attachment portion 109 is disposed at the center portion between the pair of left and right light guide devices 20, and engages the insertion portion 109a into which the protrusion portion 91 of the shade 90 is inserted and the protrusion portion 91 inserted into the insertion portion 109a. And a joint portion 109b. The insertion portion 109 a is a recess provided in the frame portion 102 along with the frame 107, and the engagement portion 109 b is a protrusion provided along with the resin portion 108. This is a protruding portion formed so that the portion extends toward the frame 107 (see FIG. 8C). In this case, the insertion portion 109a is disposed on a side relatively distant from a position assumed as the eye position of the observer (hereinafter referred to as a face position), and the engagement portion 109b is close to the face position. Will be placed on the side. The insertion portion 109a will be described in more detail. The insertion portion 109a is formed on the lower side of the frame 107 extending along the lateral direction in which the frame 107 extends by forming a concave portion having an inverted U shape in a cross-sectional view. It has a groove-like part with an open mouth. That is, the insertion portion 109a forms an insertion hole HA into which the protruding portion 91 is inserted together with an end portion of a top portion CH of a connection portion (connection region) 108g described later provided in the resin portion 108. On the other hand, the engagement portion 109b will be described more specifically. As shown in FIG. 8C, in the attachment portion 109, the engagement portion 109b is a notch portion (in which a tip support portion TS of the protrusion 91 is inserted ( (Or a notch portion) CT and a hook portion HK that is formed on both eyes of the cut portion CT and hooks and fits the tip connecting portion TC of the protrusion 91. The shade 90 is positioned and fixed when the tip support portion TS is fitted in the hook portion HK. In this case, the insertion portion 109a on the frame 107 side can be formed with rigidity, and the engagement portion 109b on the resin portion 108 side can be formed with flexibility. Thereby, when attaching the shade 90, the protrusion part 91 can be made easy to fit. Furthermore, since the protrusion 91 of the shade 90 is formed of a flexible member, it can be deformed. Thereby, when attaching the shade 90, it is possible to facilitate the operation of insertion and fitting.

  Hereinafter, as a structure around the frame portion 102 other than the attachment portion 109, the nose receiving portion 40 provided along with the frame portion 102 and the periphery thereof will be described. The nose receiving portion 40 is fixed to the central portion 107g of the front portion 107a of the frame 107 of the frame portion 102 by screws and extends downward. The nose receiving portion 40 has a fixed portion 43 at the center upper portion, a pair of length adjusting members extending vertically, and a pad portion formed at the tip of the adjusting member. The fixed portion 43 is a portion for stably fixing the nose receiving portion 40 to the frame 107. The cored bar 40a partially exposed in the fixed portion 43 is sandwiched between the central portion 107g of the frame 107 and the top portion CH of the connecting portion (connecting region) 108g provided in the central portion of the cover inside 108. The screw 107s screwed into the screw hole 107r of the portion 107a is fastened together and fixed. As another peripheral mechanism, for example, in the frame portion 102, the resin portion 108 has a storage groove portion 108c that extends along the frame 107 and can store the cable CB. The cable CB functions as a signal transmission / reception cable as appropriate for, for example, a camera CA and a display lamp LM (see FIG. 1 and the like) in addition to a signal cable necessary for image formation. In the frame portion 102, the attachment portion 109 is formed at a position that does not affect the peripheral structures such as the nose receiving portion 40 and the storage groove portion 108c as described above.

  Hereinafter, the attaching operation of the shade 90 will be described with reference to FIG. FIG. 7A shows a state in which the protrusion 91 of the shade 90 is applied to the insertion portion 109 a of the attachment portion 109 in the attachment of the shade 90 to the main body portion of the virtual image display device 100. FIG. 7B shows a state where the protrusion 91 of the shade 90 is inserted into the insertion portion 109a. FIG. 7C shows a state in which the shade 90 is engaged at the engaging portion 109 b of the attachment portion 109. FIG. 8A is a perspective view corresponding to FIG. 7A and shows the operation of inserting the protrusion 91. FIG. 8B is a perspective view corresponding to FIG. 7B and shows an operation of engaging the protrusion 91. FIG. 8C shows a fitting state between the engaged protrusion and the engaging portion.

  First, as shown in FIG. 7A or FIG. 8A, the projection 91 of the shade 90 is applied from the lower side to the insertion portion 109a, and is inserted in the upper direction indicated by the arrow A1. At this time, as indicated by a broken line in FIG. 7B, for example, the main body portion 90a of the shade 90 becomes farther away from the light guide device 20, that is, from the observer's eyes (face position) as it goes downward. The protrusion 91 on the tip side is inserted while tilting to the side. In this case, the protrusion 91 enters the back side of the insertion portion 109a while being slightly bent. Next, as shown in FIG. 7B or FIG. 8B, the protrusion 91 that has entered the insertion portion 109a is pushed in the direction indicated by the arrow A2 as a whole, that is, the side closer to the light guide device 20, so In contrast, it is set. That is, as a result, as shown in FIG. 7C or FIG. 8C, the protrusion 91 is engaged (ie, set) with the engagement portion 109b of the attachment portion 109 and is locked. The shade 90 is fixed.

  Hereinafter, the optical configuration of the virtual image display device 100 will be described in detail with reference to FIG. As a premise for this, first, the image display device 80 and the projection lens 30 constituting the first image forming main body 105a (see FIG. 1) will be described in detail.

  In addition to the video display element 82 described above, the image display apparatus 80 controls the operation of the illumination apparatus 81 that emits illumination light to the video display element 82 and the illumination apparatus 81 and the video display element 82 as illustrated. And a drive control unit 84.

  The illumination device 81 of the image display device 80 includes a light source that generates light including three colors of red, green, and blue, and a backlight light guide unit that diffuses light from the light source into a light beam having a rectangular cross section. . The video display element (video element) 82 is formed of, for example, a liquid crystal display device and includes a plurality of pixels. The video display element (video element) 82 should be a display target of a moving image or the like by spatially modulating the illumination light from the illumination device 81. Form image light. Although not shown, the drive control unit 84 supplies an image signal to a light source driving circuit that supplies electric power to the illumination device 81 and emits illumination light with a stable luminance, and a video display element (video element) 82. Alternatively, a driving signal is output to form a liquid crystal driving circuit that forms color video light or image light that is the source of a moving image or still image as a transmittance pattern. Note that the liquid crystal driving circuit can have an image processing function, but an external control circuit can also have an image processing function.

  The projection lens 30 is a projection optical system including three optical elements (lenses) 31 to 33 along the incident-side optical axis as components, and is supported by a lens barrel 39 that houses these optical elements 31 to 33. Has been. The optical elements 31 to 33 are aspheric lenses including both a non-axisymmetric aspheric surface (non-axisymmetric aspheric surface) and an axisymmetric aspheric surface (axisymmetric aspheric surface), and a part of the light guide member 10. The intermediate image corresponding to the display image of the video display element 82 is formed inside the light guide member 10 in cooperation with the above. In addition, among each lens (optical element) 31-33, the lens surface 31a which is the light emission surface of the first lens 31 is a non-axisymmetric aspheric surface, and the lens surfaces other than the lens surface 31a are as follows. It is an axisymmetric aspherical surface.

  Hereinafter, the light guide device 20 and the like will be described in detail. As described above, the light guide device 20 includes the light guide member 10 and the light transmission member 50. Among these, as for the light guide member 10, the center side (front side) part near a nose is extended linearly in planar view. Of the light guide member 10, the first light guide portion 11 disposed on the center side close to the nose, that is, on the light exit side, includes a first surface S11, a second surface S12, and a side surface having an optical function. The second light guide portion 12 having the third surface S13 and disposed on the peripheral side away from the nose, that is, on the light incident side, includes the fourth surface S14 and the fifth surface as side surfaces having an optical function. S15. Among these, the first surface S11 and the fourth surface S14 are continuously adjacent, and the third surface S13 and the fifth surface S15 are continuously adjacent. In addition, the second surface S12 is disposed between the first surface S11 and the third surface S13, and the fourth surface S14 and the fifth surface S15 are adjacent to each other at a large angle. Furthermore, here, the first surface S11 and the third surface S13 which are arranged to face each other have a planar shape substantially parallel to each other. On the other hand, other surfaces having an optical function, that is, the second surface S12, the fourth surface S14, and the fifth surface S15 are non-axisymmetric curved surfaces (free curved surfaces). As described above, the third surface S13 constitutes the first exposed surface 20a, and the third surface S11 and the fourth surface S14 constitute the second exposed surface 20b.

  In the light guide device 20, the light guide member 10 is joined to the light transmission member 50 via the adhesive layer CC, and is constituted by the joint surface of the light guide member 10 and the light transmission member 50 and the adhesive layer CC. The part to be formed is referred to as a joint CN. The light guide device 20 is formed by coating the base material to be the light guide member 10 and the light transmitting member 50 at the joint portion CN and then coating the joined base material by a dipping process. Yes. That is, the hard coat layer 27 of the light guide member 10 is provided on the entire light guide device 20 together with the light transmissive member 50.

  Among the plurality of surfaces constituting the light guide member 10, the surfaces S14 and S15 other than the surfaces from the first surface S11 to the third surface S13 have different signs of curvature depending on the direction of at least one free-form surface. At least one point is included. As a result, the light guide member 10 can be miniaturized while precisely guiding the image light.

  The main body 10s of the light guide member 10 is formed of a resin material exhibiting high light transmittance in the visible range, and is molded by, for example, injecting and solidifying a thermoplastic resin in a mold. In addition, as a material of the main body 10s, for example, a cycloolefin polymer or the like can be used. Although the main body 10s is an integrally formed product, the light guide member 10 can be functionally divided into the first light guide portion 11 and the second light guide portion 12 as described above. The first light guide portion 11 allows the image light GL to be guided and emitted, and allows the external light HL to be seen through. The second light guide portion 12 allows the image light GL to be incident and guided.

  In the first light guide portion 11, the first surface S11 functions as a refracting surface that emits the image light GL to the outside of the first light guide portion 11, and also functions as a total reflection surface that totally reflects the image light GL on the inner surface side. To do. The first surface S11 is disposed in front of the eye EY and has a planar shape as described above. The first surface S11 is a surface formed by the hard coat layer 27 applied to the surface of the main body 10s.

  The second surface S12 is the surface of the main body 10s, and the half mirror layer 15 is attached to the surface. The half mirror layer 15 is a light-transmissive reflective film (that is, a semi-transmissive reflective film). The half mirror layer (semi-transmissive reflective film) 15 is formed not on the entire second surface S12 but on a partial region (not shown) in which the second surface S12 is narrowed mainly in the vertical direction along the Y axis. . The half mirror layer 15 is formed by forming a metal reflective film or a dielectric multilayer film on the partial area PA in the lower ground of the main body 10s. The reflectance of the half mirror layer 15 with respect to the video light GL is set to be 10% or more and 50% or less in the assumed incident angle range of the video light GL from the viewpoint of facilitating observation of the external light HL by see-through. The reflectance of the half mirror layer 15 of the specific embodiment with respect to the video light GL is set to 20%, for example, and the transmittance with respect to the video light GL is set to 80%, for example.

  The third surface S13 functions as a total reflection surface that totally reflects the video light GL on the inner surface side. The third surface S13 is arranged substantially in front of the eye EY, and has a planar shape like the first surface S11. The first surface S11 and the third surface S13 are parallel to each other. Due to the smooth surface, when the external light HL is viewed through the first surface S11 and the third surface S13, the diopter is 0, and in particular, no zooming occurs. Yes. The third surface S13 is a surface formed by the hard coat layer 27 applied to the surface of the main body 10s.

  In the second light guide portion 12, the fourth surface S14 functions as a total reflection surface that totally reflects the video light GL on the inner surface side. The fourth surface S14 also functions as a refracting surface that allows the image light GL to enter the second light guide portion 12. That is, the fourth surface S <b> 14 serves both as a light incident surface on which the image light GL is incident on the light guide member 10 from the outside and a reflection surface on which the image light GL is propagated inside the light guide member 10. The fourth surface S14 is a surface formed by the hard coat layer 27 applied to the surface of the main body 10s.

  In the second light guide portion 12, the fifth surface S15 is formed by forming a light reflecting film RM formed of an inorganic material on the surface of the main body 10s, and functions as a reflecting surface.

  As described above, the light transmission member 50 is integrally fixed to the light guide member 10 to form one light guide device 20, and is a member (auxiliary optical block) that assists the see-through function of the light guide member 10. . The light transmission member 50 includes a first transmission surface S51, a second transmission surface S52, and a third transmission surface S53 as side surfaces having an optical function. Here, the second transmission surface S52 is disposed between the first transmission surface S51 and the third transmission surface S53. The first transmission surface S51 is on a surface obtained by extending the first surface S11 of the light guide member 10, and the second transmission surface S52 is joined and integrated with the second surface S12 by the adhesive layer CC. It is a curved surface, and the third transmission surface S53 is on a surface obtained by extending the third surface S13 of the light guide member 10. Among these, since 2nd transmissive surface S52 and 2nd surface S12 of the light guide member 10 are integrated by joining via the thin contact bonding layer CC, they have the shape of the substantially same curvature.

  The light transmissive member (auxiliary optical block) 50 exhibits high light transmittance in the visible range, and the main body portion of the light transmissive member 50 is a thermoplastic resin material having substantially the same refractive index as the main body 10 s of the light guide member 10. Is formed. The light transmitting member 50 is formed by bonding a main body portion to the main body 10s of the light guide member 10 and then forming a hard coat together with the main body 10s in the bonded state. That is, the light transmitting member 50 is the same as the light guiding member 10, but the hard coat layer 27 is applied to the surface of the main body portion. The first transmission surface S51 and the third transmission surface S53 are surfaces formed by the hard coat layer 27 applied to the surface of the main body portion.

  Note that, among the parts constituting the dust-proof structure DS, the seal member SP that contacts the fourth surface S14 is a variably elastic member, so that it is arranged from the region covered by the lens barrel 39 to the region not covered. Even when the fourth surface S14 as the partially covered optical surface CS, which is a surface, is a non-axisymmetric curved surface, that is, a free-form surface, a reliable seal can be maintained.

  Hereinafter, the optical path of the image light GL and the like in the virtual image display device 100 will be specifically described. The image light GL emitted from the image display element (image element) 82 passes through the lenses 31 to 33 constituting the projection lens 30 and is converged while being given the desired astigmatism. 10 is incident on the fourth surface S14 having positive refractive power. This astigmatism is canceled while passing through each surface of the light guide member 10, and image light is finally emitted toward the eyes of the observer in the initial state.

  The image light GL incident on the fourth surface S14 of the light guide member 10 and passing through the fourth surface S14 advances while converging, and has a relatively weak positive refractive power when passing through the second light guide portion 12. The light is reflected by the surface S15 and is incident again on the fourth surface S14 from the inside and reflected.

  The image light GL reflected by the fourth surface S14 of the second light guide portion 12 is incident on the third surface S13 having substantially no refractive power in the first light guide portion 11 and is totally reflected, substantially. Is incident on the first surface S11 having no refractive power and is totally reflected.

  Here, the video light GL forms an intermediate image in the light guide member 10 before and after passing through the third surface S13. The image plane II of the intermediate image corresponds to the image plane OI of the video display element 82. The image plane II of the illustrated intermediate image is formed on the side closer to the third surface S13 than the fourth surface S14 in the optical path of the image light from the third surface S13 to the fourth surface S14. That is, the image plane II of the intermediate image is separated from the fourth surface S14. As a result, even if some image light component is absorbed by the seal member SP, the image visually recognized by the seal member SP can be prevented from being felt dark.

  The image light GL totally reflected by the first surface S11 is incident on the second surface S12. In particular, the image light GL incident on the half mirror layer 15 is partially transmitted through the half mirror layer 15 while partially transmitting. And is incident again on the first surface S11 and passes therethrough. The half mirror layer 15 acts as a layer having a relatively strong positive refractive power with respect to the image light GL reflected here. The first surface S11 acts as having no refractive power with respect to the video light GL passing through the first surface S11.

  The video light GL that has passed through the first surface S11 enters the pupil of the observer's eye EY or an equivalent position thereof as a substantially parallel light beam. That is, the observer observes an image formed on the video display element (video element) 82 by the video light GL as a virtual image.

  On the other hand, among the external light HL, the light incident on the + X side from the second surface S12 of the light guide member 10 passes through the third surface S13 and the first surface S11 of the first light guide portion 11, but this At this time, since the third surface S13 and the first surface S11 are substantially parallel to each other, aberrations and the like hardly occur. That is, the observer observes an external field image without distortion through the light guide member 10. Similarly, of the external light HL, the light incident on the −X side with respect to the second surface S12 of the light guide member 10, that is, the light incident on the light transmission member 50 is the third transmission surface S53 provided thereon. When passing through the first transmission surface S51, the third transmission surface S53 and the first transmission surface S51 are substantially parallel to each other, so that no aberration or the like occurs. That is, the observer observes an external field image without distortion through the light transmission member 50. Further, among the external light HL, the light incident on the light transmissive member 50 corresponding to the second surface S12 of the light guide member 10 is transmitted through the third transmissive surface S53 and the first surface S11. Since the surface S53 and the first surface S11 are substantially parallel to each other, aberrations and the like hardly occur. That is, the observer observes an external image with little distortion through the light transmission member 50. The second surface S12 of the light guide member 10 and the second transmission surface S52 of the light transmission member 50 both have substantially the same curved surface shape, have substantially the same refractive index, and the gap between them is substantially the same. The adhesive layer CC is filled with the same refractive index. That is, the second surface S12 of the light guide member 10 and the second transmission surface S52 of the light transmission member 50 do not act as a refractive surface with respect to the external light HL.

  However, since the external light HL incident on the half mirror layer 15 is partially reflected while partially transmitting through the half mirror layer 15, the external light HL from the direction corresponding to the half mirror layer 15 is The transmittance of the half mirror layer 15 is weakened. On the other hand, since the video light GL is incident from the direction corresponding to the half mirror layer 15, the observer can view the outside world together with the image formed on the video display element (video element) 82 in the direction of the half mirror layer 15. You will observe the image.

  Of the image light GL propagated in the light guide member 10 and incident on the second surface S <b> 12, the image light GL not reflected by the half mirror layer 15 enters the light transmissive member 50, but is provided in the light transmissive member 50. Returning to the light guide member 10 is prevented by an anti-reflection portion (not shown). That is, the image light GL that has passed through the second surface S12 is prevented from returning to the optical path and becoming stray light. In addition, the external light HL incident from the light transmitting member 50 side and reflected by the half mirror layer 15 is returned to the light transmitting member 50, but is guided by the above-described antireflection unit (not shown) provided in the light transmitting member 50. It is prevented from being emitted to the optical member 10. That is, it is possible to prevent the external light HL reflected by the half mirror layer 15 from returning to the optical path and becoming stray light.

  As described above, the virtual image display device 100 according to the present embodiment has a see-through configuration, and the protrusion 91 of the shade 90 is provided in the frame portion 102 on the main body portion side of the virtual image display device 100. The projection 91 is locked to the mounting portion 109 by being inserted into the insertion portion 109a of the mounting portion 109 for attaching and detaching the shade, and further engaged to be set (set) at the engaging portion 109b. 90 can be mounted. For removal of the shade 90, for example, the entire shade 90 is pulled in the direction opposite to the direction of pushing in at the time of mounting to release the engagement, and the shade 90 can be removed from the insertion portion 109a. As described above, the shade 90 can be easily attached and detached with, for example, one hand.

[Others]
Although the present invention has been described with reference to each embodiment, the present invention is not limited to the above-described embodiment, and can be implemented in various modes without departing from the spirit of the present invention. The following modifications are possible.

  In the above-described embodiment, the protrusion 91 that engages with the attachment portion 109 provided on the frame portion 102 is an integral flexible member. However, the present invention is not limited thereto, and, for example, the tip connecting portion TC of the protrusion 91 is attached. It is a rotating part that rotates within the insertion part 109a of the part 109, and the tip support part TS is bent at the engaging part 109b of the attachment part 109 as the tip connecting part TC rotates, and the entire shade 90 is slightly framed. It can also be set as the structure engaged with the main-body part of the virtual image display apparatus 100 by bending in the direction along 102. FIG.

  In the illustrated example in the above description, the main body portion 90a of the shade 90 has a contour shape along the pair of left and right light guide devices 20, but various shapes can be applied. Various structures are also applicable. For example, as shown in FIG. 10 and FIGS. 11A and 11B, the insertion hole HA is provided at three positions of the center portion of the frame portion 102 and the pair of left and right exterior members 105d in the virtual image display device 100. In addition, a projection 191 that is a claw-shaped portion corresponding to the three insertion holes HA is provided in the shade 190, and by inserting these into the insertion hole HA, for example, two projections 191 on the lower side are provided. The rebounding force due to the flexibility of the main body portion 190a is obtained by fitting the one protrusion 191 that enters the exterior portion 105d (set so as not to drop and remains in one insertion hole HA in the center of the frame portion 102). The shade 190 may be engaged (set) and fixed by making the projection 191 hooked by using it, and at this time, as shown in FIG. The main body portion 90a of the shade 190 may be subjected to texturing or painting to prevent light leakage during shade. More specifically, as shown by arrows AA in the figure, both end sides of the shade 90 are provided. In the area DA of the inner surface, that is, the surface facing the light guide device 20 on the inner eye side, by applying a texturing or coating over a range of width DD of about 5 to 10 mm in the lateral direction, Light leakage caused by the external light HL can be accurately prevented without impairing the appearance, and the texture processing can be similarly applied to the shade 90 having the shape shown in FIG.

  Further, as another aspect of the shade, for example, a structure in which the shade is flipped up and the attachment portion main body has a flip-up structure may be used. Moreover, the electronic type using a liquid crystal and an electrochromic may be used. Furthermore, various modes are possible for the transmittance of the shade. For example, the transmittance may be set to 0%, that is, the shade may be completely closed without allowing the outside light to pass, or the transmittance may be partially transmitted (for example, About 10%), or a polarizing lens or mirror type.

  In the above description, the non-axisymmetric aspheric surface of the projection lens is a single surface. However, the projection lens may have two or more non-axisymmetric aspheric surfaces.

  In the above description, the half mirror layer (semi-transmissive reflective film) 15 is formed in a horizontally long rectangular region. However, the contour of the half mirror layer 15 can be appropriately changed according to the application and other specifications. Further, the transmittance and reflectance of the half mirror layer 15 can be changed according to the application and the like.

  In the above description, the display luminance distribution in the video display element 82 is not particularly adjusted. However, in the case where a luminance difference occurs depending on the position, the display luminance distribution can be adjusted unevenly.

  In the above description, the image display device 82 made of a transmissive liquid crystal display device or the like is used as the image display device 80, but the image display device 82 made of a transmissive liquid crystal display device or the like is used as the image display device 80. A variety of things can be used. For example, a configuration using a reflective liquid crystal display device is also possible, and a digital micromirror device or the like can be used instead of the video display element 82 formed of a liquid crystal display device or the like. Further, as the image display device 80, a self-luminous element represented by an LED array, an OLED (organic EL), or the like can be used.

  In the above embodiment, the image display device 80 including a transmissive liquid crystal display device or the like is used, but a scanning image display device can be used instead.

  In the above-described embodiment, the light guide member 10 and the light transmission member 50 that is an auxiliary optical block cover the entire front of the wearer's eye EY. The portion including the second surface S12 that is a curved surface shape having 15 covers only the eye EY or a part of the periphery thereof, that is, a portion that covers the portion in front of the eye and that does not cover may also be provided. . At this time, the shape of the shade may be adapted to the virtual image display device 100. In the case of such a configuration, the position where the image is formed may be shifted and the line-of-sight direction with respect to the image may be slightly changed as compared to the case of a configuration covering the whole.

  In the above description, the virtual image display device 100 including the pair of display devices 100A and 100B is described. However, a single display device can be used. That is, the projection fluoroscopic device 70 and the image display device 80 are not provided for each of the right eye and the left eye, but only for either the right eye or the left eye. An image display device 80 may be provided so that the image is viewed with one eye. In this case, the shape of the shade can also be changed.

  In the above description, the half mirror layer 15 is simply a semi-transmissive film (for example, a metal reflective film or a dielectric multilayer film). However, the half mirror layer 15 can be replaced with a planar or curved hologram element. .

  In the above description, the light guide member 10 and the like extend in the horizontal direction in which the eyes EY are arranged. However, the light guide member 10 can be arranged to extend in the vertical direction. In this case, the light guide member 10 has a structure arranged in parallel, not in series.

  DESCRIPTION OF SYMBOLS 10 ... Light guide member, 10s ... Main body, 11 ... Light guide part, 12 ... Light guide part, 12j ... Tip part, 15 ... Half mirror layer, 20 ... Light guide apparatus, 20a ... Exposed surface, 20b ... Exposed surface, 27 DESCRIPTION OF SYMBOLS ... Hard coat layer, 30 ... Projection lens, 31-33 ... Optical element (lens), 31a ... Lens surface, 39 ... Lens barrel part, 39 ... Lens barrel, 39t ... End part, 40 ... Nose receiving part, 40a ... Core Gold, 43 ... fixed portion, 50 ... light transmission member, 70 ... projection fluoroscopy device, 80 ... image display device, 81 ... illumination device, 82 ... video display element, 84 ... drive control unit, 90 ... shade, 90a ... main body Part: 91 ... Projection part, 100 ... Virtual image display device, 100A, 100B ... Display device, 101a, 101b ... Optical member, 102 ... Frame part, 104 ... Temple part, 105a, 105b ... Image shape Main body part, 105d ... exterior member, 107 ... frame, 107a ... front part, 107b, 107c ... side part, 107g ... center part, 107r ... hole, 108 ... resin part, 108c ... storage groove part, 109 ... mounting part, 109a ... Insertion part 109b ... engagement part A1 ... arrow, A2 ... arrow, AA ... arrow, CA ... camera, CB ... cable

Claims (8)

An image element for generating image light;
A light guide member for guiding video light from the video element;
A frame for supporting the light guide member;
Of the light guide member, a shade attached to cover at least the viewing direction ;
With
The shade has a protrusion for detachably attaching to the frame,
The frame portion has an insertion portion for inserting the projection portion of the shade, sets the projection portion inserted into the insertion portion, and fixes the shade ,
The frame portion has an engaging portion that engages the protruding portion inserted from the inserting portion and fixes the shade,
The projecting portion is disposed on the distal end side and extends along a direction corresponding to the direction in which the frame portion extends, and is connected to the distal end coupling portion inserted into the insertion portion and coupled to the distal end support portion. And having a part
In the frame portion, the engaging portion, said the incisions to insert the tip support portion to have a said distal end connecting portion of the hook fitting match hook so as to form the cut portions, the virtual image display device. An image element for generating image light;
A light guide member for guiding video light from the video element;
A frame for supporting the light guide member;
Of the light guide member, a shade attached to cover at least the viewing direction;
With
The shade has a protrusion for detachably attaching to the frame,
The frame portion has an insertion portion for inserting the projection portion of the shade, sets the projection portion inserted into the insertion portion, and fixes the shade,
The frame portion has an engagement portion that engages the protrusion inserted from the insertion portion and fixes the shade,
The frame portion includes a metal frame and a resin portion extending along the frame, the insertion portion is formed accompanying the frame, and the engaging portion is attached to the resin portion. A virtual image display device to be formed. An image element for generating image light;
A light guide member for guiding video light from the video element;
A frame for supporting the light guide member;
Of the light guide member, a shade attached to cover at least the viewing direction;
With
The shade has a protrusion for detachably attaching to the frame,
The frame portion has an insertion portion for inserting the projection portion of the shade, sets the projection portion inserted into the insertion portion, and fixes the shade,
The frame portion has an engagement portion that engages the protrusion inserted from the insertion portion and fixes the shade,
In the frame portion, the insertion portion is disposed on a side far from a position assumed as a position of the observer's eye relatively, and the engagement portion is assumed as a position of the observer's eye relatively. A virtual image display device arranged on the side close to the position. 4. The virtual image display device according to claim 1, wherein the light guide member is a prism-type member that guides image light and allows the outside light to be seen through. 5. The insert, when mounted in the shade, of the frame portion, is disposed in the center between the disposed in the right and left the guiding member, to any one of claims 1 to 4 The virtual image display device described. The protrusion is formed of a flexible member, the virtual image display device according to any one of claims 1 to 5. The virtual image display device according to any one of claims 1 to 6 , further comprising a light transmission member that overlaps and visually recognizes external light and video light by being attached to the light guide member. The light guide member includes a four-sided or more surface as an optical surface of the multiple, the a plurality of first and third surfaces of the optical surfaces are arranged so as to face,
The image light from the image element is totally reflected on the third surface, totally reflected on the first surface, reflected on the second surface, and then transmitted through the first surface to reach the observation side. ,
The virtual image display device according to any one of claims 1 to 7 , wherein in the light guide member, the first surface and the third surface are substantially parallel planes.

Images