JP2017163579A - Virtual image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a virtual image display device capable of enhancing support strength of an image light generating device while achieving weight reduction.SOLUTION: Direct fixation of a light guide part 20 to a frame 102 at a fitting part 10g being one location on the periphery facilitates fixation of the light guide part 20, makes weight reduction of a virtual image display device 100 easy, and enhances support strength of the light guide part 20 by the frame 102. Further, because the light guide part 20 is unfixed to the frame on the residual periphery part A0 except for the fitting part 10g, even when there is difference of thermal expansivity between the light guide part 20 and the frame 102, the frame 102 tolerates expansion of the light guide part 20, thereby preventing generation of distortion, deformation, and damage on the light guide part 20.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a virtual image display device that presents an image as a virtual image to an observer, and more particularly to a virtual image display device suitable for a head-mounted display that is worn on the observer's head.

  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 an HMD) that is worn on the observer's head (see, for example, Patent Documents 1 and 2).

  With respect to virtual image display devices such as HMDs, it is desired to make them smaller and lighter and to achieve a wide angle of view without degrading image quality. Further, if the entire field of view of the observer is covered and only the image light can be seen, the state of the outside world is not known to the observer, which causes anxiety. Rather, by overlaying the image with the outside world, new uses such as virtual reality are created. For this reason, there is a demand for a display that displays video light in an overlapping manner without obstructing the visual field of the outside world. Furthermore, in order to improve the wearing feeling of the observer and improve the appearance, it is generally desirable to approximate the form of glasses.

  Considering the above situation, for example, a virtual image display device is configured by a light guide unit arranged in a see-through manner in front of the observer's eyes, and image light from the image display element is transmitted to the observer through the see-through light guide unit. It is thought that it leads to the eyes. In this type of virtual image display device, it is necessary to support the light guide unit in front of the eye. For example, a pair of image display devices each including an image light generation device and a light guide plate are fixed to a coupling member, and the coupling member is attached to the spectacle frame. It is fixed behind the frame similar to (see Patent Document 1).

  However, in the virtual image display device described in Patent Document 1 or the like, since the coupling member is provided separately from the frame to support the image display device, the structure becomes complicated, and the weight is increased if the supporting strength of the image display device by the coupling member is increased. In addition, if the weight of the coupling member or the like is reduced, the support strength of the image display device is likely to be lowered.

JP2011-27543A JP 2010-145859 A

  The present invention has been made in view of the above-described background art, and an object thereof is to provide a virtual image display device capable of improving the support strength of an image display device while reducing the weight.

  In order to achieve the above object, a first virtual image display device according to the present invention is a virtual image display device that allows an observer to visually recognize an image as a virtual image, and the image element and the light from the image element are given to the observer's eyes. An optical member for visually recognizing an image, and a frame that supports the image element and the optical member so that the optical member is arranged in front of the observer's eyes. It is directly fixed to the frame, and is not fixed to the frame in the peripheral portion except the mounting portion. That is, the optical member is supported in a cantilever state or supported by local fastening or other fixing.

  In the first virtual image display device, since the optical member is directly fixed to the frame at the mounting portion which is one place around the optical member, the fixing of the optical member is simplified, the fastening portion and the number of parts are reduced, and the size is reduced. This makes it easy to reduce the weight of the virtual image display device, and improves the support strength of the optical member by the frame. Furthermore, since the optical member is not fixed to the frame in the peripheral portion excluding the mounting portion, even if there is a difference in thermal expansion coefficient between the optical member and the frame, the optical member Expansion is allowed, and it is possible to prevent the optical member from being distorted, deformed, or damaged.

  In a specific aspect of the present invention, in the first virtual image display device, the optical member reflects the image from the image element and guides it to the eyes of the observer.

  In another specific aspect of the present invention, the optical member has a prism-shaped light guide that guides the light of the image from the image display element, which is an image element, to the eyes of the observer while internally reflecting. In this case, the light guide section tends to be relatively heavy, but the light guide section is precisely arranged without deteriorating the optical characteristics of the light guide section by direct fixing to the frame using the mounting section. Can do.

  In still another aspect of the present invention, the attachment portion is provided in a portion on the incident side of the light guide portion. In this case, the portion near the video display element in the light guide is fixed to the frame, and the alignment between the video display element and the light guide becomes easy. Moreover, since the exit side portion of the light guide is opened and no fixing mechanism is provided around the observer's eyes, it is possible to suppress the placement of parts that obstruct the field of view and increase the degree of freedom in appearance. it can.

  In still another aspect of the present invention, the attachment portion is fixed to the side of the frame. In this case, the light guide is supported in a cantilevered state from the side, and the video display element is attached to the side periphery of the frame.

  In still another aspect of the present invention, the frame includes a first fixing portion that fixes the image forming main body including the video display element, and a second fixing portion that fixes the light guide portion. In this case, the image forming main body portion and the light guide portion can be individually assembled to the frame, and the assembling workability can be improved.

  In still another aspect of the present invention, the image forming main body portion is screwed to the first fixing portion, and the light guide portion is screwed to the second fixing portion. In this case, the attachment strength between the image forming main body and the light guide can be improved without sacrificing assembly workability.

  In still another aspect of the present invention, the image forming main body has a locking member that locks the light guide by contacting the light guide. In this case, it is possible to precisely align the positional relationship between the image forming main body and the light guide while ensuring the workability of assembling the image forming main body and the light guide separately to the frame, which may result in frame manufacturing errors. It contributes to the performance improvement of the virtual image display device.

  In still another aspect of the invention, the image forming main body includes a projection lens that forms an image of the light of the image from the image display element on the light guide. In this case, it is possible to form an intermediate image in the light guide unit and observe the video, and to increase the degree of freedom in arranging the video display element and the like while avoiding the enlargement of the video display element and the like.

  In still another aspect of the invention, the image forming main body has a cover-shaped exterior member fixed to the frame. In this case, generation of stray light can be suppressed while protecting the internal structure of the image forming main body.

  In still another aspect of the present invention, the light guide unit guides the light of the image and allows the outside light to be seen through, and the light transmitting member connected to the prism and supplementing the seeing function of the outside light. And have. In this case, since the light guide portion can have a shape or a state similar to the lens portion of the glasses, the field of view can be improved and the degree of freedom in appearance can be increased.

  In still another aspect of the present invention, the image element emits signal light that is scanned two-dimensionally, and the optical member reflects the light from the image element and guides it to the eyes of the observer.

  In still another aspect of the present invention, the frame includes a limiting portion that limits the displacement of the optical member with respect to a predetermined direction. In this case, undesirable displacement of the optical member can be suppressed, and deformation, distortion, breakage, etc. of the optical member can be prevented.

  In still another aspect of the present invention, the limiting unit limits the displacement of the optical member with respect to the depth direction of the frame.

  According to still another aspect of the present invention, a protector is further provided that is fixed to the frame and protects at least a part of a peripheral portion of the periphery of the optical member excluding the attachment portion. In this case, the frame and the protector can protect the optical member so as to surround the periphery of the optical member, and the durability against a strong impact from a random direction can be enhanced as when the virtual image display device is dropped.

  In still another aspect of the present invention, the frame and the protector are formed of a metal material. In this case, the frame and the protector can be made highly accurate and rigid, and the reliability of the assembly of the video display element and the optical member can be improved.

  In still another aspect of the present invention, the frame fixes and supports the pair of image elements and the pair of optical members symmetrically to the side. In this case, the virtual image display device can be a glasses type, and the same or different images can be provided to both eyes.

  In order to achieve the above object, a second virtual image display device according to the present invention is a virtual image display device that allows an observer to visually recognize an image as a virtual image, and the image element and the light from the image element are viewed by an observer's eyes. An optical member for visually recognizing an image, a frame that supports the image member and the optical member so that the optical member is disposed in front of the observer's eyes, and a frame that is coupled to the frame and around the optical member. And a protector for protecting at least a part of the surrounding portion excluding the mounting portion fixed to the frame.

  In the second virtual image display device, the protector protects the optical member so as to cover at least a part of the peripheral portion of the periphery of the optical member excluding the attachment portion fixed to the frame. That is, the frame and the protector can be protected so as to surround and cover the periphery of the optical member. Thereby, durability against a strong impact from a random direction can be enhanced as when the virtual image display device is dropped.

  In a specific aspect of the present invention, in the second virtual image display device, the optical member is a prism-shaped guide that guides the image light from the image display element, which is an image element, to the observer's eyes while internally reflecting the light. It has a light part.

  In another specific aspect of the present invention, the optical member is in a non-fixed state with respect to the protector. In this case, even if there is a difference in thermal expansion coefficient between the optical member and the protector, the optical member Is allowed to expand, and deformation, distortion, breakage and the like of the optical member can be suppressed.

  In still another aspect of the present invention, the protector is a frame-like member that extends elongated. In this case, the protector can be made lightweight, and the appearance can be arranged like a part of the spectacle frame, so that a sense of incongruity in design can be eliminated.

  In another specific aspect of the present invention, the protector is fixed directly or indirectly to the central part and the side of the frame. In this case, the protector can be simply fixed to the frame and integrated.

It is a perspective view explaining the external appearance of the virtual image display apparatus which is 1st Embodiment of this invention. (A) is a perspective view which shows the whole virtual image display apparatus, (B) is a perspective view which shows the internal structure which removed the exterior member and the protector from the virtual image display apparatus. (A)-(C) are the front view, back surface side perspective view, and side view of a virtual image display device of an embodiment. (A)-(C) are the front view, back view, and side view of a virtual image display device with which an internal structure can be seen. It is a perspective view which shows the state which removed the exterior member etc. in order to demonstrate the structure of a 1st display apparatus among virtual image display apparatuses. (A) And (B) is a perspective view explaining the external appearance of the light guide part or optical member incorporated in the 1st display apparatus. (A) And (B) is an exploded perspective view explaining the fixing method to the flame | frame of a light guide part and a projection lens among virtual image display apparatuses. It is sectional drawing in the symmetry plane regarding the upper and lower sides of the 1st display apparatus which comprises a virtual image display apparatus. (A) is a front view explaining the virtual image display apparatus which is 2nd Embodiment of this invention, (B) is a top view explaining the structure of a 1st display apparatus among virtual image display apparatuses. It is a figure explaining the virtual image display apparatus of a modification.

[First Embodiment]
Hereinafter, the first embodiment of the virtual image display device according to the present invention will be described in detail with reference to FIG.

  As shown in FIG. 1, the virtual image display device 100 according to the present embodiment is a head-mounted display having an appearance like glasses, and image light based on a virtual image is given to an observer or a user wearing the virtual image display device 100. Can be visually recognized, and the observer can visually recognize or observe the outside world image with see-through. The virtual image display device 100 includes first and second optical members 101a and 101b that cover the front of an observer so as to be seen through, a frame 102 that supports both optical members 101a and 101b, and a rear portion from both left and right ends of the frame 102. (Temple) 104 includes first and second image forming main body portions 105 a and 105 b added to the portion extending to 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. 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. 2 is a diagram in which the appearance and the inside of the virtual image display device 100 are contrasted. FIG. 2A shows the entire virtual image display device 100, and FIG. 2B shows the internal structure of the virtual image display device 100. Is shown. 3A to 3C correspond to FIG. 2A and are a front view, a rear side perspective view, and a side view of the outer appearance of the virtual image display device 100. FIG. 4A to 4C correspond to FIG. 2B, and are a front view, a back view, and a side view of the internal structure of the virtual image display device 100. FIG. FIG. 5 corresponds to the left half of FIG. 2B and is a perspective view in which the first display device 100A side of the virtual image display device 100 is partially enlarged.

  As shown in the figure, the frame 102 provided in the virtual image display device 100 is an elongated plate-like member bent in a U shape, and includes a front portion 102a extending in the left and right lateral direction (X direction) and the front and rear depth directions ( And a pair of side surface portions 102b and 102c extending in the Z direction). The frame 102, that is, the front surface portion 102a and the side surface portions 102b and 102c are metal integrated parts formed of aluminum die casting or other various metal materials. The width of the front portion 102a in the depth direction (Z direction) is sufficiently thicker than the thickness or width of the light guide portion 20 corresponding to the first and second optical members 101a and 101b. The first optical member 101a and the first image forming main body 105a are located on the left side of the frame 102, specifically, on the side end 65a that is a portion from the left end to the side surface 102b in the front portion 102a. It is supported by being aligned and fixed directly by screwing. The second optical member 101b and the second image forming main body 105b are provided on the right side of the frame 102, specifically, on the side end 65b, which is the portion from the right end to the side surface 102c toward the front 102a. Are supported by being aligned and fixed directly by screws. 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.

  A protector 108 is fixed to the frame 102 as an under rim-like member or a frame-like member. The central part 108g of the protector 108 is fixed to the central part 102g of the frame 102 by fitting and screwing. Therefore, as shown in FIG. 4B, a fixing recess 102k is formed in the central portion 102g of the frame 102, and a screw hole is formed in the center of the recess 102k. The protector 108 is an elongated plate-like member bent in a two-stage crank shape, and is an integral part formed of a metal material or a resin material. The width of the protector 108 in the depth direction (Z direction) is about the thickness or width of the light guide unit 20 corresponding to the first and second optical members 101a and 101b. The first tip 108i of the protector 108 is fixed to the first image forming main body 105a by fitting, and the second tip 108j of the protector 108 is fixed to the second image forming main body 105b by fitting. Is done. More specifically, the first distal end portion 108i of the protector 108 is fixed in a state of being fitted into a recess 105i provided in the outer member 105e of the cover-shaped exterior member 105d that covers the first image forming main body portion 105a. . Further, the second tip end portion 108j of the protector 108 is fixed in a state of being fitted into a recess 105j provided in the outer member 105e among the cover-shaped exterior member 105d that covers the second image forming main body portion 105b.

  The frame 102 not only supports the first and second image forming main body portions 105a and 105b, but also protects the inside of the first and second image forming main body portions 105a and 105b in cooperation with the exterior member 105d. Have. The protector 108 has a role of protecting 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 side and lower sides of the light guide unit 20. Specifically, the vertical portion 63a of the protector 108 protects the inner side portion of the peripheral portion A0 of the light guide 20 from various surrounding objects existing in the use environment, and the horizontal portion 63b of the protector 108. Protects the lower part of the lower side of the peripheral part A0 of the light guide part 20 from various objects in the environment of use. That is, if the frame 102 and the protector 108 have sufficient strength, even if the virtual image display device 100 collides with other surrounding objects, the first and second image forming main body portions 105a and 105b and the first and second image forming main body portions 105a and 105b. 2 It is possible to reduce the possibility of occurrence of damage or misalignment in the optical members 101a and 101b, particularly the exposed light guide portion 20.

  A pad-shaped nose pad member 108a is formed in each of the pair of vertical portions 63a close to the central portion 108g of the protector 108. The vertical portion 63a and the horizontal portion 63b of the protector 108 are separated from or loosely in contact with the peripheral portion A0 of the light guide portion 20 excluding the root side connected to the first and second image forming main body portions 105a and 105b. . The peripheral portion A0 of the light guide 20 is also separated from or loosely in contact with the front portion 102a of the frame 102. As described above, the light guide unit 20 is close to the frame 102 and the protector 108 at the C-shaped peripheral portion A0 excluding the base side, but is not fixed to the frame 102 and the protector 108. For this reason, even if there is a difference in thermal expansion coefficient between the central light guide 20 and the frame member 109 including the frame 102 and the protector 108, the light guide 20 is expanded in the frame member 109. It is allowed to prevent the light guide 20 from being distorted, deformed or damaged.

  As shown in FIG. 4B, FIG. 5, and the like, the first display device 100A includes a projection see-through device 70 that is a projection optical system and an image display device 80 that forms image light, if viewed differently. Prepare. The projection see-through device 70 has a role of projecting the image formed by the first image forming main body 105a as a virtual image onto the eyes of the observer. The projection see-through device 70 includes a light guide and see-through prism 10, a see-through light transmitting member 50, and an imaging projection lens 30.

  As shown in FIG. 6, the prism 10 and the light transmission member 50 are fixed to each other to form an integrated light guide 20. Here, the light transmitting member 50 is coupled to the first prism portion 11 on the optically downstream tip side, that is, the emission side or the light emission side, out of the prism 10 connected to the projection lens 30 optically upstream. The first prism portion 11 is fixed to the first prism portion 11 by bonding using an adhesive. In the projection fluoroscopic device 70 shown in FIG. 5 and the like, the light guide unit 20 in which the prism 10 and the light transmissive member 50 are combined corresponds to the first optical member 101a in FIG. The image display device 80 that forms the image pattern for use corresponds to the first image forming main body 105a in FIG.

  With reference to FIGS. 7A and 7B, the assembly of the first display device 100A to the frame 102 will be described. The projection lens 30 constituting the first image forming main body portion 105 a is attached to a first fixing portion 61 f provided at the side end portion 65 a of the frame 102 using an attachment portion 39 g formed to be embedded in the lens barrel 39. Directly fixed. At the time of such fixing, the back surface 68f of the first fixing portion 61f and the upper end surface 39f of the mounting portion 39g come into contact with each other to achieve alignment, and the screw 61t is screwed into the mounting portion 39g through the screw hole 61s. Removable and secure fixing is possible. At this time, the boss 39x provided in the lens barrel 39 is fitted into the boss hole 61x of the frame 102, and the rotation of the lens barrel 39 is restricted, and positioning related to the rotation is also performed. On the other hand, the light guide portion 20 that is the first optical member 101a is attached to the second fixing portion 61e provided at the side end portion 65a of the frame 102 by using the protruding attachment portion 10g formed on the neck portion. Directly fixed. The mounting portion 10g is erected so as to extend to the periphery of the incident-side or light-incident-side portion of the light guide portion 20, specifically, around the boundary between the first prism portion 11 and the second prism portion 12. . At the time of such fixing, the abutting surface 68e provided at the front portion of the second fixing portion 61e and the back surface 10k of the mounting portion 10g come into contact with each other to achieve alignment, and the screw 61v is screwed through the screw hole 10u. By screwing into 61u, it is possible to attach and detach and secure. At this time, the peripheral portion of the back surface 10k of the mounting portion 10g is also brought into contact with the second fixing portion 61e to reinforce the alignment. The image display device 80 shown in FIG. 5 and the like is fixed so as to be fitted into the rear end of the lens barrel 39 of the projection lens 30.

  The light guide unit 20 is configured such that the distal end portion 12j of the prism 10 on the second prism portion 12 side is fitted to a rectangular frame-shaped locking member 39a provided on the front end side of the lens barrel 39 of the projection lens 30 and opened. The projection lens 30 is locked while being positioned. That is, when the prism 10 provided in the light guide 20 is fixed to the second fixing portion 61 e of the frame 102, the tip portion 12 j on the second prism portion 12 side is fitted into the locking member 39 a of the lens barrel 39. Insert like so. At this time, the side surface 12m of the distal end portion 12j contacts the inner surface 39m of the locking member 39a, thereby achieving alignment.

  On the lower surface 102m of the front portion 102a of the frame 102, as shown in FIG. 7B, a groove-shaped limiting portion 102n is provided as a stopper. After assembly of the first optical member 101a or the light guide unit 20, the protruding portion 10n provided at the upper end of the prism 10 provided in the light guide unit 20 has a loose fit in the limiting unit 102n. Is inserted. Thereby, the displacement of the front end side of the first optical member 101a or the light guide unit 20 can be limited in the depth direction of the frame 102 (Z direction shown in FIG. 2B). The rib 10n of the light guide 20 and the restricting portion 102n of the frame 102 extend in the horizontal direction (X direction) on the left and right, and the rib 10n and the restricting portion 102n are not in close contact with or joined to each other. An unfixed state of the unit 20 with respect to the frame 102 is secured. That is, the light guide unit 20 is slightly separated from the protector 108 and is not fixed in relation to the protector 108. Thereby, even if there is a difference in the coefficient of thermal expansion between the light guide 20 and the frame 102, the light guide 20 is allowed to expand relative to the frame 102.

  Through the steps described above, an assembly of the frame 102 and the projection see-through device 70 (see FIG. 2B) can be obtained.

  The assembly of the exterior member 105d to the frame 102 will be described with reference to FIGS. 2 (A) and 2 (B). First, the outer member 105e of the exterior member 105d is fixed to an assembly such as the frame 102 and the projection fluoroscopic device 70. The external material 105e is fixed by fitting with the frame 102 or the projection lens 30, screw fastening to the attachment portion 39g of the projection lens 30, or the like. At this time, the front end portions 108i and 108j of the protector 108 already fixed to the frame 102 are fitted and fixed to the recesses 105i formed in the outer member 105e. Next, the inner member 105f is fitted into the outer member 105e and fixed to the outer member 105e by screwing. Accordingly, the projection lens 30, the image display device 80, and the like constituting the first image forming main body portion 105a in the space sandwiched between the inner member 105f and the outer member 105e, and the second light that is a part of the light guide portion 20. The prism portion 12 and the side surface portions 102b and 102c of the frame 102 are accommodated. That is, the assembly of the first display device 100A is completed.

  The second display device 100B shown in FIG. 1 has a structure similar to that of the first display device 100A, and is simply reversed in the left-right symmetry, so the structure of the second display device 100B. Description of functions, assembly, etc. is omitted.

  As shown in FIGS. 2A, 7A, etc., the vine portion 104 is fixed to a hole 102q provided at the tip of a pair of side surface portions 102b, 102c provided in the frame 102. The connecting portion between the vine portion 104 and the side surface portions 102b and 102c can have a hinge structure. In this case, the vine portion 104 can be folded.

  With reference to FIG. 8, details of functions, operations, and the like of the projection see-through device 70 configuring each of the display devices 100B and 100A will be described. In the projection see-through device 70, the prism 10, which is a part of the light guide unit 20, is an arc-shaped member that is curved along the face in plan view. The first prism portion 11 of the prism 10 is disposed on the center side close to the nose, that is, on the light emission side, and has a first surface S11, a second surface S12, and a third surface S13 as side surfaces having optical functions. The second prism portion 12 is disposed on the peripheral side away from the nose, that is, on the light incident side, and has a fourth surface S14, a fifth surface S15, and a sixth surface as side surfaces having optical functions. S16. Among these, the first surface S11 and the fourth surface S14 are adjacent to each other, the third surface S13 and the fifth surface S15 are adjacent to each other, and the second surface S12 is disposed between the first surface S11 and the third surface S13. The sixth surface S16 is disposed between the fourth surface S14 and the fifth surface S15.

  In the prism 10, the first surface S11 is a free-form surface having the exit side optical axis AXO parallel to the Z axis as a central axis, and the second surface S12 is included in a reference surface (cross section shown) parallel to the XZ surface. The third surface S13 is a free-form surface having the emission-side optical axis AXO as the central axis, with the optical axis AX1 tilted with respect to the Z-axis as the central axis. The fourth surface S14 is a free-form surface having a bisector of a pair of optical axes AX3 and AX4 included in the reference plane parallel to the XZ plane and inclined with respect to the Z axis as a central axis, and a fifth surface S15. Is a free-form surface having a bisector of a pair of optical axes AX4 and AX5 included in the reference plane parallel to the XZ plane and inclined with respect to the Z axis, and the sixth plane S16 is an XZ plane Is a free-form surface having an optical axis AX5 tilted with respect to the Z axis as a central axis. The first to sixth surfaces S11 to S16 described above are vertical (or vertical) with a reference plane (cross section shown) passing through the optical axes AX1 to AX5 and the like parallel to the horizontal (or horizontal) XZ plane. ) With respect to the Y-axis direction.

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

  In the first prism portion 11, the first surface S11 functions as a refracting surface that emits the image light GL out of the first prism portion 11, and also functions as a total reflection surface that totally reflects the image light GL on the inner surface side. The first surface S11 is arranged in front of the eye EY and has a concave shape with respect to the observer. The first surface S11 is a surface formed by the hard coat layer 27 provided on the surface of the prism main body 10s.

  The second surface S12 is the surface of the prism 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 reflection film) 15 is formed not on the entire second surface S12 but on the partial area PA 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 prism 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 in front of the eye EY, and has a concave shape with respect to the observer, like the first surface S11, and allows the first surface S11 and the third surface S13 to pass therethrough. When the external light HL is viewed, the diopter is substantially zero. The third surface S13 is a surface formed by the hard coat layer 27 provided on the surface of the prism main body 10s.

  In the second prism 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 is a surface formed by the hard coat layer 27 applied to the surface of the prism main body 10s.

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

  The sixth surface S <b> 16 functions as a refracting surface that causes the image light GL to enter the second prism portion 12. The sixth surface S16 is a surface formed by the hard coat layer 27 applied to the surface of the prism main body 10s.

  As described above, the light transmitting member 50 is fixed integrally with the prism 10 to form one light guide 20. The light transmitting member 50 is a member (auxiliary prism) that assists the see-through function of the prism 10, and includes a first transmitting surface S51, a second transmitting surface S52, and a third transmitting surface S53 as side surfaces having optical functions. And have. 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 curved surface obtained by extending the first surface S11 of the prism 10, and the second transmission surface S52 is a curved surface joined and integrated with the second surface S12 by the adhesive layer CC. The third transmission surface S53 is on a curved surface obtained by extending the third surface S13 of the prism 10. Among these, the second transmission surface S52 and the second surface S12 of the prism 10 are integrated by joining via the thin adhesive layer CC, and thus have substantially the same shape of curvature.

  The light transmitting member (auxiliary prism) 50 exhibits high light transmittance in the visible range, and the main body portion of the light transmitting member 50 is formed of a thermoplastic resin material having substantially the same refractive index as the prism main body 10s of the prism 10. ing. The light transmitting member 50 is formed by bonding a main body portion to the prism main body 10s of the prism 10 and then forming a film by hard coating together with the prism main body 10s in the bonded state. That is, the light transmitting member 50 is the same as the prism 10 in that 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.

  The image display device 80 is an illumination device 81 that emits two-dimensional illumination light SL, a video display element 82 that is a transmissive spatial light modulator, and a drive that controls the operation of the illumination device 81 and the video display element 82. And a control unit 84.

  The illumination device 81 of the image display device 80 includes a light source 81a that generates light including three colors of red, green, and blue, and a backlight light guide unit 81b that diffuses light from the light source 81a into a light beam having a rectangular cross section. Have The video display element 82 is a video element formed by a liquid crystal display device, for example, and spatially modulates the illumination light SL from the illumination device 81 to form image light to be a display target such as a moving image. The drive control unit 84 includes a light source drive circuit 84a and a liquid crystal drive circuit 84b. The light source driving circuit 84a supplies electric power to the light source 81a of the illuminating device 81 to emit illumination light SL having a stable luminance. The liquid crystal drive circuit 84b outputs an image signal or a drive signal to the image display element (image element) 82, thereby forming color image light or image light as a source of a moving image or a still image as a transmittance pattern. . Note that the liquid crystal driving circuit 84b can have an image processing function, but an external control circuit can also have an image processing function.

  Hereinafter, an optical path of the image light GL and the like in the virtual image display device 100 will be described. The video light GL emitted from the video display element (video element) 82 is converged by the projection lens 30 and is incident on the sixth surface S16 provided on the prism 10 and having a relatively strong positive refractive power.

  The image light GL that has passed through the sixth surface S16 of the prism 10 proceeds while converging, and is reflected by the fifth surface S15 having a relatively weak positive refractive power when passing through the second prism portion 12, Reflected by the fourth surface S14 having a weak negative refractive power.

  The image light GL reflected by the fourth surface S14 of the second prism portion 12 is incident on the third surface S13 having a relatively weak positive refractive power and totally reflected by the first prism portion 11, and is relatively weak. The light enters the first surface S11 having negative refractive power and is totally reflected. The video light GL forms an intermediate image in the prism 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 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. Further, the first surface S11 acts as having negative 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 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 prism 10 passes through the third surface S13 and the first surface S11 of the first prism portion 11, but at this time, Positive and negative refractive powers are canceled and aberration is corrected. That is, the observer observes an external image with little distortion through the prism 10. Similarly, of the external light HL, the light incident on the + X side from the second surface S12 of the prism 10, that is, the light incident on the light transmission member 50, is provided with the third transmission surface S53 and the first transmission surface provided thereon. When passing through the surface S51, the positive and negative refractive powers are canceled and aberration is corrected. That is, the observer observes an external image with little distortion through the light transmission member 50. Further, of the external light HL, the light incident on the overlapping portion of the light transmission member 50 facing the second surface S12 of the prism 10 is positive or negative when passing through the third transmission surface S53 and the first surface S11. The refractive power is canceled and aberration is corrected. That is, the observer observes an external image with little distortion through the light transmission member 50. Note that the second surface S12 of the prism 10 and the second transmission surface S52 of the light transmission member 50 not only have substantially the same curved surface shape but also 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 prism 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 directed toward the eye EY from the direction corresponding to the half mirror layer 15 is reflected. HL is weakened by the transmittance of the half mirror layer 15. On the other hand, since the image light GL enters from the direction corresponding to the half mirror layer 15 toward the eye EY, the observer forms on the image display element (image element) 82 in the direction of the half mirror layer 15. The external image is observed together with the image that has been displayed.

  Of the image light GL propagated in the prism 10 and incident on the second surface S <b> 12, the image light GL not reflected by the half mirror layer 15 is incident on the light transmitting member 50, but is not provided on the light transmitting member 50. Returning to the prism 10 is prevented by the illustrated antireflection portion. 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 the prism is formed by the above-described antireflection unit (not shown) provided in the light transmitting member 50. 10 is prevented from being injected. 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 is clear from the above description, according to the virtual image display device 100 of the first embodiment, the optical members 101a and 101b or the light guide unit 20 are directly fixed to the frame 102 at the mounting portion 10g that is one place around. Therefore, the light guide 20 can be easily fixed, the virtual image display device 100 can be easily reduced in weight, and the support strength of the light guide 20 by the frame 102 is also improved. Furthermore, since the optical members 101a and 101b or the light guide 20 are not fixed to the frame 102 and the protector 108 in the remaining peripheral portion A0 except for the mounting portion 10g, the light guide 20 and the frame 102, etc. Even if there is a difference in the coefficient of thermal expansion, the expansion of the light guide 20 is allowed with respect to the frame 102 and the like, and the optical members 101a and 101b or the light guide 20 are prevented from being distorted, deformed, or damaged. it can.
Further, according to the virtual image display device 100 of the present embodiment, at least one of the remaining peripheral portions A0 except the attachment portion 10g where the protector 108 is fixed to the frame 102 among the periphery of the optical members 101a and 101b or the light guide portion 20. Protect to cover the part. That is, the frame 102 and the protector 108 can protect the optical members 101a and 101b or the light guide unit 20 so as to surround and cover the periphery. Thereby, durability against a strong impact from a random direction can be enhanced as when the virtual image display device 100 is dropped.

[Second Embodiment]
Hereinafter, the virtual image display apparatus according to the second embodiment will be described. Note that the virtual image display device of the present embodiment is a modification of the virtual image display device 100 of the first embodiment, and is the same as the virtual image display device 100 shown in FIG.

  Hereinafter, the virtual image display device 200 of the present embodiment will be described with reference to FIGS. 9 (A) and 9 (B). As shown in the figure, a virtual image display device 200 according to the present embodiment includes first and second optical members 201a and 201b that cover the front of an observer so as to be seen through, a frame 102 that supports both optical members 201a and 201b, 102 includes first and second driving units 205a and 205b fixed to portions from the left and right ends to the rear of 102, and first and second video elements 206a and 206b that emit signal light that is two-dimensionally scanned. . The first display device 100A in which the first optical member 201a on the left side, the first drive unit 205a, and the first video element 206a in the drawing are combined is a portion that forms a virtual image for the right eye. Function as. Further, the second display device 100B in which the second optical member 201b on the right side, the second drive unit 205b, and the second video element 206b in the drawing are combined is a part that forms a virtual image for the left eye, and the first display. Only the left and right sides of the device 100A are inverted, and the same function as that of the first display device 100A is obtained.

  In the first display device 100A, the first video element 206a forms intensity-modulated signal light and emits the signal light as scanning light TL. The first optical member 201a is an irradiated member that forms the image light GL by reflecting the scanning light TL from the first video element 206a, and has a function of guiding such image light GL to the eye EY. The first drive unit 205a includes a main body portion 280 including a light source that supplies illumination light to the first video element 206a via an optical fiber (not shown), a control circuit that operates the first video element 206a, and the like.

  The first image element 206 a is assembled to the nose pad member 108 a and is indirectly fixed to the frame 102. The first image element 206a includes a signal light modulation unit 281 that modulates illumination light from the main body portion 280 based on a control signal, and a scanning optical system 282 that emits the signal light that has passed through the signal light modulation unit 281 while scanning. Have. Here, the scanning optical system 282 is configured by a MEMS mirror or the like, and the first optical member is adjusted by adjusting the optical path of the signal light by changing the posture in synchronization with the modulation of the signal light by the signal light modulation unit 281. Two-dimensional scanning is performed to change the emission angle of the light beam (scanning light TL) onto the inner surface of 201a vertically and horizontally.

  The first optical member 201a is arranged so as to cover the front of the wearer's eye EY in front of the first video element 206a or in the light emission direction. The first optical member 201 a includes a semi-transmissive reflective film 285 that is a semi-transmissive film that receives scanning light irradiation, and a support member 286 that supports and fixes the semi-transmissive reflective film 285. As a result, not only a virtual image by the image light GL but also light from the outside enters the wearer's eye EY, and the virtual image display device 200 has a see-through configuration that allows both to be observed. ing. The transflective film 285 can be a half mirror, but can also be a hologram or other diffractive optical element.

  The first optical member 201a is not an internal propagation type light guide like the first optical member 101a of the first embodiment, but has a thin elliptical shape covering the front of the eye as in the first embodiment, A peripheral portion A0, which is a part of the outer periphery, has a mounting portion 10g and a rib 10n.

  The assembly of the first optical member 201a to the frame 102 will be described. The first optical member 101a is directly fixed to the second fixing portion 61e provided on the side end portion 65a on the side of the frame 102 by using the protruding mounting portion 10g formed on the peripheral portion A0. The first video element 206a and the like are aligned. The frame 102 is provided with a groove-shaped limiting portion 102n as a stopper. After the assembly of the first optical member 201a, the protruding rib 10n provided at the upper end of the first optical member 201a is inserted into the limiting portion 102n in a loosely fitted state with a slight gap. Thereby, the displacement of the front end side of the first optical member 201 a can be limited in the depth direction of the frame 102. The portion of the first optical member 201a excluding the mounting portion 10g is slightly separated from the frame 102 and the protector 108, and is in an unfixed state in relation to the frame 102 and the protector 108.

  Hereinafter, an image forming operation will be described. First, in the first video element 206a, the signal light modulation unit 281 forms and emits signal light obtained by modulating illumination light corresponding to the luminance of the pixels constituting the image. The signal light emitted from the signal light modulation unit 281 enters a scanning optical system 282 that is a scanning unit. The scanning optical system 282 emits signal light as scanning light TL toward the first optical member 101a. In the first optical member 101a, by making the scanning light TL enter, a virtual image is formed by the image light GL as reflected light here, and the image is recognized by the observer capturing the virtual image with the eyes EY. .

  As mentioned above, although this invention was demonstrated according to embodiment, this invention is not restricted to said embodiment, In the range which does not deviate from the summary, it is possible to implement in various aspects, for example, The following modifications are possible.

  In the first embodiment, the frame 102 and the projection lens 30 are separate and the projection lens 30 is fixed to the frame 102 by screwing. However, the lens barrel 39 of the projection lens 30 may be integrally formed with the frame 102. it can. As a method of integrally forming the lens barrel 39 with the frame 102, there are methods such as outsert molding and cutting of the lens barrel after die casting integral molding.

  The light guide unit 20 or the projection lens 30 can be fixed to the frame 102 by various methods, not limited to fastening by screwing.

  In the above description, the protector 108 is attached to the frame 102, but the protector 108 can be omitted. In this case, it is possible to connect the auxiliary member provided with the nose pad member 108a to the central portion 102g of the frame 102 while maintaining the frame 102 shown in FIG. It is also possible to prepare in advance a frame 102 provided integrally with. Such an auxiliary member can be used as a member that protects the light guide unit 20 in the same manner as the vertical portion 63 a of the protector 108. Note that the frame 102 and the protector 108 can be integrally manufactured.

  In the above description, the light guide 20 or the like that is the first optical member 201a is supported in a cantilever state on the frame 102 side. However, the light guide 20 or the like can be supported from the periphery by the frame 102 or the protector 108. it can. At this time, it is desirable to provide a member or a mechanism that allows relative expansion and contraction of the light guide unit 20 in the frame 102 and the protector 108.

  In the first embodiment, the projection lens 30 is arranged on the light incident side of the prism 10, but the projection lens 30 can be omitted and the prism 10 itself can have an imaging function. In addition, another prism 10 having an imaging function can be arranged instead of the projection lens 30.

  In the above description, the restricting portion 102n is provided in the frame 102. However, instead of or in addition to this, the protector 108 may be provided with a similar restricting portion for preventing the prism 10 from being deformed or shaken.

  In the first embodiment, the locking member 39a that enables locking to the light guide unit 20 is provided in the lens barrel 39 of the projection lens 30, but for example, the lens tube 39 is sandwiched between the light guide unit 20 side. A locking member that fits into the lens barrel 39 can be provided.

  In the first embodiment, the half mirror layer (semi-transmissive reflective film) 15 is formed in a horizontally long rectangular region. However, the outline of the half mirror layer 15 can be changed as appropriate according to the purpose and other uses. . Further, the transmittance and reflectance of the half mirror layer 15 can be changed according to the application and the like.

  In the first embodiment, 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 is replaced with a planar or curved hologram element. Can do.

  In the first embodiment, 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 first embodiment, the image display device 82 composed of a transmissive liquid crystal display device or the like is used as the image display device 80, but the image display device 80 employs a video display composed of a transmissive liquid crystal display device or the like. Not only the element 82 but various 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. As the image display device 80, a self-luminous element typified by an LED array, OLED (organic EL), or the like can be used.

In the first embodiment, the image display device 80 composed of a transmissive liquid crystal display device or the like is used, but a scanning image display device can be used instead.
Specifically, as illustrated in FIG. 10, the first display device 100 </ b> A as a virtual image display device includes a light guide unit 20 and an image display device 380. The light guide 20 is the same as that described in the first embodiment, and a description thereof is omitted here. On the other hand, the image display device 380 corresponds to the first video element 206a of the second embodiment, and includes a signal light forming unit 381 and a scanning optical system 282. The signal light forming unit 381 also includes a light source, and forms and emits signal light LL. The scanning optical system 282 adjusts the optical path by changing the attitude of the MEMS mirror in accordance with the modulation of the signal light forming unit 381, thereby causing the scanning light TL to be the video light GL to enter the light guide unit 20 and the first. Of the two surfaces S12, the entire partial region where the half mirror layer 15 is formed is scanned. The operation of the illustrated first display device 100A will be described. In the image display device 380, the signal light LL emitted from the signal light forming unit GG enters the scanning optical system 282. The scanning optical system 282 emits the signal light LL as the scanning light TL toward the sixth surface S16 of the light guide unit 20. The light guide unit 20 guides the scanning light TL that has passed through the sixth surface S <b> 16 by total reflection or the like to reach the half mirror layer 15. At this time, by scanning the scanning light TL on the surface of the half mirror layer 15, a virtual image is formed by the image light GL as a locus of the scanning light TL, and the wearer grasps this virtual image with the eye EY. The image is recognized. In the illustrated case, the sixth surface S16 that is the light incident surface of the light guide 20 is a plane perpendicular to the optical axis of the scanning light TL. The fifth surface S15 and the fourth surface S14 are also flat.

  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 frame 107 and the vine portion 104 can be shaped symmetrically as shown in FIG. 1 or the like, for example, but the frame portion on the side that does not support the display device is fixed other than the ear. Different shapes are possible.

  In the above description, the distance between the pair of display devices 100A and 100B in the X direction is not described, but the distance between the display devices 100A and 100B is not limited to being fixed, and the distance can be adjusted by a mechanical mechanism or the like. That is, if an expansion / contraction mechanism or the like is provided on the frame 102, the distance between the display devices 100A and 100B in the X direction can be adjusted according to the wearer's eye width and the like.

  In the first embodiment, the first surface S11 and the third surface S13 of the prism 10 are guided by totally reflecting the image light by the interface with the air without applying a mirror or a half mirror on the surface. The total reflection in the virtual image display device 100 of the present invention includes reflection formed by forming a mirror coat or a half mirror film on the whole or a part of the first surface S11 or the third surface S13. For example, after the incident angle of the image light satisfies the total reflection condition, the whole or a part of the first surface S11 or the third surface S13 is subjected to mirror coating or the like, and substantially all the image light is reflected. Cases are also included. In addition, as long as image light with sufficient brightness can be obtained, the first surface S11 or the third surface S13 may be entirely or partially coated with a somewhat transmissive mirror.

  In the above description, the prism 10 and the like extend in the horizontal direction in which the eyes EY are arranged, but the prism 10 may be arranged to extend in the vertical direction. In this case, the prism 10 is supported, for example, in a cantilever state at the top.

  A0 ... Ambient part, AX1-AX5 ... Optical axis, AXO ... Exit side optical axis, EY ... Eye, GL ... Video light, OI ... Image plane, RM ... Light reflection film, S11-S16 ... First to sixth surfaces, S51-S53 ... 1st-3rd transmission surface, SL ... Illumination light, 10 ... Prism, 10g ... Mounting part, 11 ... 1st prism part, 12 ... 2nd prism part, 12j ... Tip part, 15 ... Half mirror layer 20 ... light guide, 30 ... projection lens, 39 ... lens barrel, 39a ... locking member, 39g ... mounting part, 50 ... light transmitting member, 61e ... fixing part, 61f ... fixing part, 61x ... boss hole, 65a , 65b ... side end portions, 68e ... abutment surface, 70 ... projection see-through device, 80 ... image display device, 81 ... illumination device, 82 ... video display element, 84 ... drive control unit, 100 ... virtual image display device, 100A ... first display 100B ... second display device 101a ... first optical member 101b ... second optical member 102 ... frame 102a ... front portion 102b, 102c ... side portion 102n ... restricting portion 104 ... vine portion 105a DESCRIPTION OF SYMBOLS 1st image formation main-body part, 105b ... 2nd image formation main-body part, 105d ... Exterior member, 105i ... Recessed part, 108 ... Protector, 108a ... Nose pad member, 108g ... Center part, 108i ... Tip part, 109 ... Frame shape Element

Claims (16)

A virtual image display device that allows an observer to visually recognize an image as a virtual image,
An image element;
An optical member for visually recognizing an image by directing light from the image element toward the eyes of an observer;
A frame for supporting the image element and the optical member so that the optical member is disposed in front of the eyes of an observer;
The optical member is directly fixed to the frame at a mounting portion that is one place around, and is in an unfixed state with respect to the frame at a peripheral portion excluding the mounting portion,
The optical member includes a prism-shaped light guide unit that internally reflects image light from the image element and guides the light to an observer's eye,
The attachment part is a virtual image display device provided on an incident side of the light guide part and fixed to a side of the frame.   2. The virtual image display device according to claim 1, wherein the frame includes a first fixing unit that fixes an image forming main body including the video element, and a second fixing unit that fixes the light guide unit.   The virtual image display device according to claim 2, wherein the image forming main body portion is screwed to the first fixing portion, and the light guide portion is screwed to the second fixing portion.   4. The virtual image display device according to claim 2, wherein the image forming main body includes a locking member that locks the light guide by contacting the light guide. 5.   5. The virtual image display device according to claim 4, wherein the image forming main body includes a projection lens that forms an image of the image light from the image element on the light guide. 6.   The virtual image display device according to claim 1, wherein the image forming main body portion includes a cover-shaped exterior member fixed to the frame.   The light guide unit includes a prism that guides light of an image and allows the light of the outside world to be seen, and a light transmissive member that is connected to the prism and supplements the function of seeing the light of the outside world. The virtual image display device according to any one of 6 to 6.   The virtual image display device according to claim 1, wherein the image element emits signal light that is two-dimensionally scanned, and the optical member reflects the light from the image element and guides the light to an observer's eye.   The virtual image display device according to any one of claims 1 to 8, wherein the frame includes a limiting unit that limits displacement of the optical member with respect to a predetermined direction.   The virtual image display device according to claim 9, wherein the restriction unit restricts displacement of the optical member with respect to a depth direction of the frame.   The virtual image display according to any one of claims 1 to 10, further comprising a protector that is fixed to the frame and that protects at least a part of a peripheral portion of the periphery of the optical member excluding the attachment portion. apparatus.   The virtual image display device according to claim 11, wherein the frame and the protector are formed of a metal material.   The virtual image display device according to claim 11, wherein the optical member is in an unfixed state with respect to the protector.   The virtual image display device according to any one of claims 11 to 13, wherein the protector is an elongated frame-like member.   The virtual image display device according to any one of claims 11 to 14, wherein the protector is directly or indirectly fixed to a central portion and a side of the frame.   The virtual image display device according to any one of claims 1 to 15, wherein the frame fixes and supports a pair of video elements and a pair of optical members symmetrically laterally.

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