CN203786393U - Virtual image display device and projector - Google Patents

Abstract

The utility model provides a virtual image display device and a projector. The virtual image display device can be simply and reliably aligned, and miniaturization of the virtual image display device can be achieved. The virtual image display device can adjust the position of an image display element (82) serving as an image element relative to a projection lens (30) serving as an projection optical system through a plate-shaped portion (87) and an interconnecting piece (CN), and an image element housing (86) for accommodating the image display element (82) and a lens barrel (39) for accommodating the projection lens (30) are bonded. Accordingly, even though manufacture errors and the like exist in the projection lens (30) and deviations are generated in the optical system, the above deviations can be corrected when the projection lens (30) and the image display element (82) are aligned, and reliable alignment of the virtual image display device can be achieved.

Description

Virtual image display device and projector

technical field

The utility model relates to a virtual image display device for presenting images formed by image display elements to an observer, in particular to a virtual image display device suitable for a head-mounted display worn on the observer's head and a small projector.

Background technique

Various configurations 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) worn on the head of an observer (for example, refer to Patent Document 1).

With regard to virtual image display devices such as HMDs, progress in miniaturization and weight reduction, and wide-angle widening without degrading image quality are desired. In addition, if the viewer's field of view is completely covered and only image light can be seen, the observer cannot judge the state of the outside world, causing anxiety. Rather, new uses such as virtual reality can be created by using a see-through that superimposes the outside world and images for observation. Therefore, it is desired to realize a display that superimposes image light without obstructing the view of the outside world.

In view of the above situation, for example, a light guide device is constituted by a see-through prism having a plurality of free-form surfaces and arranged in a see-through manner in front of the observer's eyes, thereby being close to the form of glasses and improving the wearability of the observer. A feeling makes the style of the appearance good. In this case, as an optical system for visually recognizing an image, it is conceivable to use a see-through prism to guide image light formed by, for example, a display element and a projection optical device disposed on the side of the head to the front of the eye.

However, in terms of miniaturization of the virtual image display device, particularly when fixing components to the optical system, there is a problem that a large space is required for the assembly part. In addition, miniaturization is also desired in projectors. For example, in the case of citing Documents 1 to 4, mounting members are provided to mount a display element including a liquid crystal display device to a projection optical device. At this time, it is generally known to perform bonding in a state where clearances are provided at the four corners of the outer end of the mounting member through a fitting portion having a pin and a hole (for example, refer to FIG. 2 of Cited Document 1 and FIG. 5 of Cited Document 2, etc.). A direct method established as a technique of correcting (absorbing deviation) in the projection optical system or the like at the time of alignment of the projection optical system and the liquid crystal display device. However, in such a method, it is necessary to provide a large mounting site outside the portion having an optical function, and thus the miniaturization of the device is limited. Therefore, when further miniaturization of the device is required from various viewpoints such as reducing the burden of wearing the HMD and improving the appearance, the above method may not be able to sufficiently cope. The problem of meeting the demand for miniaturization of such video elements is not limited to virtual image display devices such as HMDs, and may similarly arise when miniaturization of display elements such as projectors further progresses.

[Patent Document 1] Japanese Patent Laid-Open No. 2012-163640

[Patent Document 2] Japanese Unexamined Patent Publication No. 2004-294893

[Patent Document 3] Japanese Patent Laid-Open No. 2006-171268

[Patent Document 4] Japanese Patent No. 3617527

Utility model content

The present invention is made in view of the above-mentioned background technology, and an object of the present invention is to provide a virtual image display device and a projector that can easily and reliably align devices and realize downsizing of the devices.

In order to achieve the above object, the virtual image display device of the present invention includes: an image element; an image element housing, which accommodates and supports the image element; a projection optical system, which projects light from the image element; and a lens barrel, which accommodates and supports the image element. At least a part of the projection optical system, and connected with the image element housing by bonding; and a light guide device, which makes the light from the projection optical system toward the observer's eyes so that the observer sees the image, the image element housing and the mirror One of the tubes has a plate-like portion that protrudes toward the other side and forms a bonding area when the other is bonded, and the other of the image element housing and the lens barrel has a connecting portion. The connecting portion includes a planar portion provided corresponding to the plate-shaped portion and forming a bonding area, in which the connecting portion cooperates with the plate-shaped portion while enabling adjustment of the relative position of the image element and the projection optical system Glue them.

In the above-mentioned virtual image display device, the relative position of the image element and the projection optical system is adjusted by the plate portion and the connection portion, and the image element case accommodating the image element and the lens barrel accommodating the projection optical system can be bonded. Therefore, even if a deviation occurs due to a manufacturing error in the projection optical system, the deviation can be corrected during alignment of the projection optical system and the liquid crystal display device, and reliable device alignment can be performed. In this case, compared with the case of aligning the four corners of the outer end portion of the image element or the like by, for example, using a pin and a hole to provide a gap fitting portion, etc., the device can be miniaturized, and it can be made simple. structure.

In a specific aspect of the present invention, the plate-shaped portion and the planar portion respectively extend approximately parallel to the optical axis in the lens barrel. Here, "approximately parallel to the optical axis" refers not only to the fact that the surfaces of the plate-shaped portion and the planar portion to be bonded are completely parallel to the optical axis, but also includes cases where each surface has a slight inclination within a range that does not affect alignment. In this case, each of the plate-shaped portion and the planar portion extends approximately parallel to the optical axis, thereby forming a bonding region without enlarging the mounting portion (bonding portion) in the direction perpendicular to the optical axis, that is, ensuring Adhesive surface.

In another aspect of the present invention, the plate-like portion is formed as a part of the image element housing to extend toward the lens barrel side, and the planar portion is formed as a part of the side surface of the lens barrel. In this case, since the plate-shaped portion extends along and covers the side surface of the lens barrel as the planar portion, it is possible to securely secure the bonding area without affecting the optical portion.

In yet another aspect of the present invention, the lens barrel has a plurality of planar portions in the connecting portion, and a stepped portion is formed between the planar portions. In this case, the presence of the stepped portion makes it easier for the adhesive to remain in the bonding region, whereby the bonding portion can be reliably formed.

In yet another aspect of the present invention, the plate-like portion has a slit-like portion, and the connecting portion has a convex rib provided corresponding to the slit-like portion. In this case, the amount of adhesion (adhesion area) can be increased by the slit-shaped portion and the convex rib, and the adhesion state can be made firmer.

In yet another aspect of the present invention, the imaging device housing is U-shaped, and has a main body for accommodating the imaging device and a pair of opposing plate-shaped parts extending from both ends of the main body toward the lens barrel. In this case, since the plate-like portions have a pair of structures extending oppositely from both ends of the image element case, reliable bonding can be performed sandwiching the lens barrel from both end sides. In addition, since the image element housing is U-shaped, for example, the adhesive can be cured by irradiating ultraviolet light from the side without the plate-shaped portion.

In yet another aspect of the present invention, the image element is configured to the side of the observer's head when worn, and there are a pair of opposite plate-shaped parts in the image element housing, the plate-shaped portions are separated from the main body in the vertical direction. Both ends of the portion extend toward the lens barrel side, and the vertical direction corresponds to the longitudinal direction perpendicular to the horizontal direction in which the observer's eyes are aligned. In this case, it is possible to avoid an increase in the size of the device accompanying assembly in the lateral direction in which the observer's eyes are arranged in particular to achieve compactness from the viewpoint of design and the like.

In yet another aspect of the present invention, the image element housing and the lens barrel are bonded by an ultraviolet curable resin in a bonded region formed by the plate-like portion and the connecting portion. In this case, it is possible to bond and fix in a short time if necessary by irradiation of ultraviolet light. Therefore, even with a simple structure including a connection part including a planar part and a plate-shaped part, it is difficult to align the projection optical system with the liquid crystal display device. Correction can also be performed, and bonding can be reliably performed in a short time in the corrected state.

In yet another aspect of the present invention, the image element is a liquid crystal display device that spatially modulates illumination light to form image light. In this case, even if the liquid crystal display device is small, it is possible to form a high-definition image, for example, a color image using a color filter can be expressed.

In yet another aspect of the present invention, the lens barrel has a connection portion that is connected to the light guide device on the light exit side to integrate the optical system from the projection optical system to the light guide device. In this case, the lens barrel can integrally assemble all optical systems for forming a virtual image.

In yet another aspect of the present invention, the plate-like portion and the flat portion enable adjustment of the position of the image element in a state coupled to the light guide device via the lens barrel. In this case, even if deviations occur due to manufacturing errors or the like during assembly of the projection optical system and the light guide device, the deviations can be corrected during alignment of the imaging element and the lens barrel.

In yet another aspect of the present invention, the image element housing and the lens barrel have an adjustment structure portion forming an adjustment amount that enables a distance between the plate-like portion and the plane portion to be equal to the observer's eyes. Adjustment is performed in the horizontal direction of the horizontal direction of the array and the vertical direction corresponding to the vertical direction perpendicular to the horizontal direction. In this case, it is possible to adjust horizontally and vertically on the assumption of the positions of the observer's eyes during assembly of the image element case and the lens barrel.

In order to achieve the above object, the projector of the present invention is provided with: an image element; an image element housing, which accommodates and supports the image element; a projection optical system, which projects light from the image element; and a lens barrel, which accommodates and supports the image element. At least a part of the projection optical system, and is connected with the image element casing by bonding, and one of the image element casing and the lens barrel has a plate-shaped portion, and the plate-shaped portion is arranged to protrude toward the other side and form a connection with the other side. In the bonding area during bonding, the other of the image element case and the lens barrel has a connecting portion including a planar portion provided corresponding to the plate-shaped portion and forming a bonding area, and in this planar portion, the The connecting portion cooperates with the plate-shaped portion to bond them while adjusting the relative positions of the image element and the projection optical system.

In the above projector, the relative positions of the image element and the projection optical system are adjusted through the plate portion and the connecting portion, and the image element case housing the image element and the lens barrel housing the projection optical system can be bonded. Therefore, even if a deviation occurs due to a manufacturing error in the projection optical system, the deviation can be corrected during alignment of the projection optical system and the liquid crystal display device, and reliable device alignment can be performed. In this case, compared with the case of aligning the four corners of the outer end portion of the image element or the like by, for example, using a pin and a hole to provide a gap fitting portion, etc., the device can be miniaturized, and it can be made simple. structure.

In a specific aspect of the present invention, the plate-like portion and the planar portion respectively extend approximately parallel to the optical axis of the lens barrel. In this case, each of the plate-shaped portion and the planar portion extends approximately parallel to the optical axis, thereby forming a bonding region without enlarging the mounting portion (bonding portion) in the direction perpendicular to the optical axis, that is, ensuring Adhesive surface.

Description of drawings

FIG. 1 is a perspective view illustrating the appearance of a virtual image display device according to one embodiment of the present invention.

FIG. 2 is a perspective view showing the internal structure of the virtual image display device with exterior parts and a projector removed.

FIG. 3(A) and FIG. 3(B) are perspective views illustrating the appearance of a light guide unit or an optical member incorporated in the first display device.

4(A) and 4(B) are exploded perspective views illustrating how to fix the light guide member and the projection lens to the frame in the virtual image display device.

5(A) is a perspective view illustrating the appearance and structure of the first display device, and FIG. 5(B) is a perspective view of the first display device viewed from a different direction from FIG. 5(A) .

6(A) is a perspective view explaining the structure of the assembled part of the lens barrel and the video device case, and FIG. 6(B) is a perspective view of the assembled part viewed from a different direction from FIG. 6(A) .

7(A) is a schematic sectional view for explaining the joining of the lens barrel and the image element housing, FIG. 7(B) is a schematic side view, and FIG. 7(C) is a schematic top view.

8(A) is a diagram showing the lens barrel before bonding, FIG. 8(B) is a diagram showing the lens barrel and image element housing after the adhesive is applied, and FIG. 8(C) It is a figure which shows the lens barrel and imaging element case after bonding.

9 is a cross-sectional view of a first display device constituting the virtual image display device with respect to a plane of symmetry that is symmetrical up and down.

FIG. 10 is a diagram schematically showing an example of a projector.

Label description

AA, AX1-AX5: optical axis; AXO: optical axis on exit side; EY: eye; GL: image light; OI: image plane; RM: light reflection film; S11-S16: first-sixth surface; S51-S53 : 1st-3rd transmission surface; SL: illumination light; 10: light guide part; 10g: mounting part; 11: first light guide part; 12: second light guide part; Mirror layer; 20: light guide device; 30, 230: projection lens; 39, 239: lens barrel; 39a: locking part (connecting part); 39g: installation part; 39p: plane part; ST: stepped part; CN : connecting part; PRa, PRb: convex rib; 50: light-transmitting member; 61e: fixing part; 61f: fixing part; 61x: boss hole; 65a, 65b: side end; : projection perspective device; 80: image display device; 81: lighting device; 82, 282: image display element (image element); 84: drive control unit; 86, 286: image element housing; 86a, 286a: main part; 87, 287: plate-shaped part; 87a, 287a: upper part; 87b, 287b: lower part; SLa, SLb: slit-shaped part; 100: virtual image display device; 100A: first display device; 100B: second display Device; 101a: first optical component; 101b: second optical component; 102: frame; 107: frame; 107a: front; 107b, 107c: side; 107n: restriction; 104: leg; 1 image forming main body part; 105b: second image forming main body part; 105d: exterior parts; 108: protection part; 108a: nose contact part; 108g: central part; projector.

Detailed ways

Hereinafter, one embodiment of the virtual image display device of the present invention will be described in detail with reference to FIG. 1 and the like.

As shown in FIG. 1 , the virtual image display device 100 of this embodiment is a head-mounted display having an appearance like glasses, and an observer or user who wears the virtual image display device 100 can visually view an image formed by a virtual image. Light, and the observer can see or observe the external image through perspective. The virtual image display device 100 is equipped with: the first and the second optical components 101a, 101b, which cover the eyes of the observer in a see-through manner; the frame portion 102, which supports the two optical components 101a, 101b; and the first and second image forming The main body parts 105a and 105b are added to the part from the left and right ends of the frame part 102 to the rear leg part (temple part) 104 . Here, the first display device 100A formed by combining the first optical member 101a on the left side and the first image forming main body 105a in the drawing is a part that forms a virtual image for the right eye, and can also be displayed as a virtual image alone. The device functions. In addition, the second display device 100B formed by combining the second optical member 101b on the right side and the second image forming main body 105b in the drawing forms a virtual image for the left eye, and can also be used as a virtual image display device alone. function.

FIG. 2 shows the internal structure of the virtual image display device 100 . In addition, by comparing FIG. 2 with FIG. 1 , the appearance and interior of the virtual image display device 100 are compared. In addition, FIG. 4 corresponds to the right half of FIG. 2 and is a partially enlarged perspective view of the first display device 100A side of the virtual image display device 100 .

As shown in FIG. 1 and the like, the frame portion 102 provided in the virtual image display device 100 includes a frame 107 disposed on the upper side and a protection portion 108 disposed on the lower side. In the frame portion 102, the upper frame 107 is an elongated plate member bent into a U-shape, and the frame 107 includes: a front portion 107a extending in the lateral direction (X direction) from left to right; A pair of side surface parts 107b and 107c extending (Z direction). The frame 107, ie, the front portion 107a and the side portions 107b, 107c is an integral part made of metal formed of aluminum die-cast or other various metal materials. The width in the depth direction (Z direction) of the front portion 107a is sufficiently thicker than the thickness or width of the light guide device 20 corresponding to the first and second optical members 101a and 101b. In addition, as shown in FIG. 2 , on the left side of the frame 107, specifically, at the side end 65a of the front portion 107a from the left end to the side portion 107b, the first optical member 101a and the first image are formed. The main body parts 105a are aligned with each other and directly fixed by screw fastening to be supported thereon. In addition, on the right side of the frame 107, specifically, at the side end 65b that is the portion from the right end of the front portion 107a to the side portion 107c, the second optical member 101b and the second image forming main body portion 105b are aligned with each other. And it is directly fixed by screw fastening, thereby being supported there. Moreover, the 1st optical member 101a and the 1st image forming main body part 105a are mutually aligned by fitting, and the 2nd optical member 101b and the 2nd image forming main body part 105b are mutually aligned by fitting.

In addition, as shown in FIG. 2 , from another perspective, the display devices 100A and 100B each include: a projection see-through device 70 as an optical system for projection; and an image display device 80 that forms video light. The projection see-through device 70 has a function of projecting the images formed by the first and second image forming main bodies 105a, 105b as virtual images to both eyes of the observer. The projection see-through device 70 includes a light guide member 10 for light guide and see-through, a light-transmitting member 50 for see-through, and a projection lens 30 for imaging. In addition, the details will be described later with reference to FIG. 3 , but the light guide device 20 is composed of the light guide member 10 and the light transmission member 50 .

The image display device 80 includes, in addition to an image display element (image element) 82 as a transmissive spatial light modulator, an illumination device 81 as a backlight that emits illumination light to the image display element 82 ; 82 etc. drive control unit (not shown). The image display element 82 is accommodated in an image element case 86 , and assembled into the lens barrel 39 that accommodates the projection lens 30 for imaging through the image element case 86 . In addition, the illumination device 81 and the drive control part which are not shown in the image display apparatus 80 will be described in detail later in FIG. 9 .

Returning to FIG. 1 , the protection portion 108 is an under rim-shaped member, which is fixed to the frame 107 . The central part 108g of the protection part 108 is fixed to the central part 107g of the frame 107 by fitting and screw fastening (refer FIG. 2). The protector 108 is a crank (crank)-shaped elongated plate-shaped member bent into two stages, and is an integral member formed of a metal material or a resin material. The width of the protection portion 108 in the depth direction (Z direction) is about the thickness or width of the light guide device 20 .

The frame 107 not only supports the first and second image forming main parts 105a, 105b, but also cooperates with the cover-shaped exterior member 105d to protect the inside of the first and second image forming main parts 105a, 105b. The protection part 108 has the function of protecting the side and bottom parts of the first and second optical members 101a and 101b connected to the first and second image forming main parts 105a and 105b or the light guide device 20 . Specifically, the longitudinal portion 63a of the protective portion 108 protects the side portion close to the inner side of the nose in the peripheral portion of the light guide device 20 from damage caused by various objects existing in the surroundings of the use environment, and the lateral direction of the protective portion 108 The portion 63b protects the lower lower edge portion of the surrounding portion of the light guide device 20 from damage caused by various objects existing around in the use environment. That is, if the frame 107 and the protective part 108 have sufficient strength, even if the virtual image display device 100 collides with other surrounding objects, the main parts 105a, 105b and the first and second images can be formed on the first and second images. In the optical components 101a, 101b, especially in the exposed light guide device 20, the possibility of damage or misalignment is reduced.

At a pair of longitudinal portions 63a of the protective portion 108 close to the central portion 108g, there are respectively formed pad-shaped nose contact members 108a. The longitudinal portion 63a and the lateral portion 63b of the protective portion 108 are separated from or gently in contact with the elliptical peripheral portion of the light guide device 20 excluding the root side connected to the first and second image forming main body portions 105a, 105b. In addition, the peripheral portion of the light guide 20 is also away from or gently in contact with the front portion 107 a of the frame 107 . Thus, the first and second optical members 101a and 101b or the light guide device 20 are close to the frame 107 and the protection part 108 at the C-shaped peripheral part except the root side, but are not fixed to the frame 107 and the protection part 108 . Therefore, even if there is a difference in thermal expansion coefficient between the light guide 20 in the center and the frame portion 102 including the frame 107 and the protective portion 108, the expansion of the light guide 20 in the frame portion 102 is allowed, thereby preventing the light guide 20 from 20 produces distortion, deformation and breakage.

As shown in FIG. 3 , the light guide member 10 and the light transmission member 50 are fixed to each other to form an integrated light guide device 20 . The light guide device 20 is a prism-shaped member that internally reflects light of an image and guides it to the eyes of the observer. The main body portion surrounded by the peripheral portion in the light guide device 20 has an elliptical outline. Here, the light-transmitting member 50 is arranged along the extending direction in a manner connected to the end side of the light-guiding member 10, which is a prism-shaped member, that is, the first light-guiding portion 11 on the exit side or the light-exit side. It is fixed to the first light guide part 11 by bonding with an adhesive. A first rib 10 n is formed near the upper side of the frame 107 in a peripheral portion of the light guide part (optical member) 20 , and a second rib 10 o is formed near the lower side of the protection part 108 . The first rib 10n on the upper side has a structure in which a plurality of rib portions (protrusions) 10p and a plurality of enlarged width portions (protrusions) 10q are alternately connected, and is linearly thinned along the edge of the light guide device 20 as a whole. long extension. Among them, the former rib portion (convex portion) 10p is provided concomitantly with the first light guide portion 11 and the light-transmitting member 50, and alignment of these members and the like can be performed. The latter enlarged width portion 10 q corresponds to a gate of a mold for injection molding the first light guide portion 11 and the light transmissive member 50 . The widened portion 10q is not limited to a gate, and may be formed by transferring and molding the first light guide portion 11 and the light transmissive member 50 into a special shape. The details of the first rib 10n will be described later, and it is a locking part that is locked to a restricting part 107n (refer to FIG. 4(B)). The existence of the portion) 10n restricts the displacement of the light guide device 20 in the depth direction (Z direction). Here, "locked to the restricting part" refers to being fixed mechanically, and it is not limited to the fitting of unevenness, but also widely includes connection by fasteners, installation of one or more protrusions for movement prevention, and restriction in a specific direction. Various means such as moving guides.

Assembly of the first display device 100A to the frame 107 will be described with reference to FIG. 4(A) and FIG. 4(B) . The projection lens 30 constituting the first image forming body part 105a is directly fixed to the first fixing part provided on the side end part 65a of the frame 107 by the mounting part 39g formed so as to be embedded in the lens barrel 39 housing the projection lens 30 61f. When fixing in this way, the back surface 68f of the first fixing part 61f abuts against the upper end surface 39f of the mounting part 39g to achieve alignment, and the screw 61t can be screwed into the mounting part 39g through the threaded hole 61s, which can be detachably performed. Reliable fixation. At this time, the boss hole 61x of the frame 107 is fitted into the boss 39x provided on the lens barrel 39 to restrict the rotation of the lens barrel 39 and perform positioning with respect to the rotation. On the other hand, the light guide device 20 as the first optical member 101a is directly fixed to the second fixing part 61e provided on the side end part 65a of the frame 107 by the protrusion-shaped mounting part 10g formed on the neck thereof. The attachment portion 10g is erected so as to expand around the portion on the incident side or the light incident side of the light guide device 20 , specifically, the boundary periphery between the first light guide portion 11 and the second light guide portion 12 . When fixing in this way, the abutment surface 68e provided on the front side portion of the second fixing part 61e abuts against the back surface 10k of the mounting part 10g to achieve alignment, and the screw 61v is screwed into the screw hole 10u through the screw hole 10u. 61u, which can be reliably fixed in a detachable manner.

In the light guide device 20, the end portion 12j of the light guide member 10 on the side of the second light guide part 12 is fitted with a rectangular frame-shaped locking member 39a provided on the front end side of the lens barrel 39 that accommodates the projection lens 30 and having an opening. , so as to be locked with respect to the projection lens 30 in a positioned state. That is, when the light guide member 10 provided on the light guide device 20 is fixed to the second fixing portion 61e of the frame 107, the end portion 12j on the side of the second light guide portion 12 is inserted into the end portion 12j of the lens barrel 39 in a fitted manner. inside the locking part 39a. At this time, the side surface 12m of the distal end portion 12j abuts against the inner surface 39m of the locking member 39a to achieve alignment. That is, the locking member 39 a is a connection portion in the lens barrel 39 that is connected to the light guide device 20 on the light exit side, and integrates the optical system from the projection lens 30 to the light guide device 20 .

As shown in FIG. 4(B), on the lower surface 107m of the front portion 107a of the frame 107, a groove-shaped restricting portion 107n is provided as a stopper on the central side appropriately spaced from the second fixing portion 61e. The restricting portion 107n has a pair of opposing rib portions 107r extending along the front portion 107a of the frame 107, and has a groove 107s provided so as to be sandwiched between the rib portions 107r and extending along the front portion 107a. . The groove 107s has a structure in which a plurality of groove portions (recesses) 107p and a plurality of width-enlarged portions (recesses) 107q are alternately connected. After the first optical member 101a or the light guide device 20 is assembled, the protruding rib 10n provided on the upper end of the light guide device 20 is inserted into the restricting portion 107n in a gap-fit state with a slight gap. As a result, the rib (locking portion) 10n is accommodated in the groove 107s, and is locked to the restricting portion 107n including the pair of ridges 107r sandwiching the groove 107s by the engagement of the concave portion and the convex portion. Here, the engagement of the concave part and the convex part is not limited to the fitting of the concave part and the convex part in close contact, but also includes the case where the concave part and the convex part are separated from each other and the movement beyond a certain limit is restricted.

Here, the virtual image display device 100 according to the present embodiment assembles each optical system such as the light guide device 20 and the projection lens 30 as the projection optical system in the aligned state as described above, and then assembles and accommodates the projection by bonding. The lens barrel 39 of the lens 30 and the image element case 86 accommodates the image display element 82 as an image element. In this assembly, a gap is provided between the plate-shaped portion 87 (see FIG. 2 ) of the image element case 86 at the assembly site and the connecting portion CN of the lens barrel 39, and the displayed image is confirmed. While maintaining the state in which the alignment is achieved and performing bonding, it is possible to correct (absorb deviation) the deviation due to manufacturing errors in the light guide device 20 and the projection lens 30, etc., so that in a good state Visually identify images. Regarding such a misalignment correction method by alignment, a mode different from that of the present embodiment is known. For example, as one of the conventional forms, a technique has been established in which alignment is achieved by a fitting portion having a pin and a hole at four corners of the outer end portion of the mounting member (see FIG. 2 of Cited Document 1). However, in such a conventional method, when components such as an image element are fixed to the optical system, a large laterally protruding space is required as an assembly part, and it may be difficult to miniaturize the HMD. In particular, in the case of an HMD configured such that a video element is placed on the side of the observer's head as in this embodiment, further compactness (miniaturization) is required from the viewpoint of design and weight reduction. On the other hand, in this embodiment, it is a structure which can cope with miniaturization while maintaining the adjustment accuracy at the time of assembling in a state of high precision.

Hereinafter, with reference to FIG. 5 and the like, the structure of the assembly portion of the image element case 86 and the lens barrel 39 will be described. (A) of FIG. 5 is a perspective view for explaining the appearance and structure of the first display device 100A, and is a view showing, in particular, a state when the image element case 86 and the lens barrel 39 are adhered. In addition, (B) of FIG. 5 is a perspective view of a state in which the first display device 100A in the state of (A) of FIG. 5 is viewed from a direction different from that of (A) of FIG. 5 . In addition, as shown in the figure, the optical axis of the lens barrel 39 is assumed to be an optical axis AA. This optical axis AA corresponds to the optical axis of the projection lens 30 . (A) of FIG. 6 is an enlarged perspective view showing a part of the first display device 100A in order to illustrate the structure of the assembled part of the lens barrel 39 and the image element housing 86 in the first display device 100A, and (B) of FIG. 6 ) is a perspective view of a state in which the assembled part is viewed from a direction different from that of (A) of FIG. 6 . In addition, regarding the lens barrel 39 , the structure of the connecting portion CN, which is a portion connected to the image element case 86 at the time of assembly, will be described here.

First, the structure of the image display device 80 including the video element case 86 will be described. As already described, the image display device 80 includes the lighting device 81 and the video display element 82 , and these components are housed integrally in the video element case 86 . Furthermore, as shown in the figure, a panel wiring board 88 connected to the video display element 82 and a light source wiring board 89 connected to the lighting device 81 extend from one end of the video device case 86 . In addition, the wiring board 88 for a panel and the wiring board 89 for a light source are connected to the drive control part etc. which are not shown in figure.

The structure of the image element case 86 will be described below. The image element housing 86 has a main body portion 86 a and a plate portion 87 , and is U-shaped (or C-shaped) with a vacant portion toward the lens barrel 39 side when viewed from the side. To describe it more specifically, first, the main body portion 86a accommodates the video display element 82 . On the other hand, the plate-like portion 87 is composed of an upper portion 87a and a lower portion 87b, which are part of the image element housing 86. The upper portion 87a and the lower portion 87b are viewed from the main body portion 86a in the vertical direction (Y direction). ) are a pair of opposing flat plate-shaped components extending toward the side of the lens barrel 39 from the relevant two ends thereof. The upper portion 87 a and the lower portion 87 b extend substantially parallel to the optical axis AA of the lens barrel 39 , respectively. As described above, the image element case 86 has a U-shape by the main body portion 86a, the upper portion 87a, and the lower portion 87b.

Further, the upper portion 87a and the lower portion 87b respectively have slit-shaped portions SLa, SLb extending from the lens barrel 39 side along the optical axis direction of the lens barrel 39 at the central portion.

Next, the structure of the connecting portion CN in the lens barrel 39 will be described. The connecting portion CN is an end portion on the light incident side of the lens barrel 39 , is a cylindrical portion bonded to the image element case 86 , and constitutes a part of the side surface of the lens barrel 39 . The connection portion CN has a planar portion 39p, a stepped portion ST, and convex ribs PRa, PRb. In addition, these parts are all provided along the cylindrical outer periphery of the connection part CN, and constitute a part of the side surface of the lens barrel 39 . The connecting portion CN is a portion for bonding the image display element 82 and the projection lens 30 while adjusting the relative positions thereof in cooperation with the plate portion 87 at the planar portion 39p.

The plane portion 39p is a part of the side surface of the lens barrel 39, and is a flat outer surface portion extending approximately parallel to the optical axis AA of the lens barrel 39, and is bonded to the plate-like portion 87 constituting the image element housing 86. The upper part 87a and the lower part 87b which are flat members face each other. In addition, the planar portion 39p is composed of a plurality of surface portions, and a plurality of stepped portions ST are formed between the respective surface portions. Looking at it another way, the stepped portion ST is a plurality of groove-shaped portions provided between the planar portions 39p.

As described above, the imaging element case 86 has the plate-shaped portion 87 provided to protrude toward the lens barrel 39 side and to form an adhesion region when the lens barrel 39 is adhered. In contrast, the lens barrel 39 includes a planar portion 39p which is provided corresponding to the plate-like portion 87 and forms an adhesive region. The inner surfaces of the upper part 87a and the lower part 87b constituting the plate-shaped part 87 and the planar part 39p (the outer surface of the connection part CN) respectively extend approximately parallel to the optical axis AA of the lens barrel 39, and these parts become The installation site is the bonding site, that is, the bonding area is formed. In this case, each of the plate-shaped portion 87 and the planar portion 39p extends approximately parallel to the optical axis AA, whereby a sufficiently large bonding area can be formed without enlarging the bonding site in the direction perpendicular to the optical axis AA. At the plate-shaped portion 87 and the planar portion 39p, by making a state where a gap is provided, deviations due to manufacturing errors and the like in the light guide device 20 and the projection lens 30 are performed at the plate-shaped portion 87 and the connecting portion CN. Correction (absorption of deviations) to achieve alignment, and bonding so that images can be visually recognized in a good state.

In addition, as described above, the video element case 86 has a U-shape, so that the plate-shaped portion 87 can sandwich the connecting portion CN of the lens barrel 39 from both ends thereof and be reliably bonded. In particular, in the plate-shaped portion 87, the upper side portion 87a and the lower side portion 87b respectively extend from both ends of the main body portion 86a toward the side of the lens barrel 39 in a vertical direction (Y direction) corresponding to the viewer's The eyes are arranged horizontally vertically vertically. When the video display element 82 is arranged on the side of the observer's head when worn as in the present embodiment, it is particularly desirable to achieve compactness in the lateral direction where the observer's eyes are arranged from a design point of view. On the other hand, by employing the configuration as described above, it is possible to avoid increasing the size of the device in the lateral direction while maintaining reliable adhesion.

In addition, since the video element case 86 is U-shaped, the adhesive can be cured by irradiating ultraviolet light from the lateral side (horizontal side) that does not have the plate-like portion 87 during bonding.

Furthermore, as described above, the connecting portion CN has not only the planar portion 39p facing the plate portion 87 but also the stepped portion ST as a groove portion at the portion to be bonded to the video element case 86 . In this case, if the adhesive is applied to the connection portion CN side during bonding, the connection portion CN can be accurately aligned during bonding while properly controlling the flow of the adhesive into the bonding region.

In addition, the planar portion 39p has convex ribs PRa, PRb extending in the direction of the optical axis of the lens barrel 39 from the image element case 86 side, respectively, at the central portion. The convex ribs PRa, PRb are provided corresponding to the slit-shaped portions SLa, SLb of the above-mentioned upper side portion 87a and lower side portion 87b, respectively. That is, the convex rib PRa fits into the slit-shaped portion SLa, and the convex rib PRb fits into the slit-shaped portion SLb. The presence of these slit-shaped portions SLa, SLb and convex ribs PRa, PRb can increase the amount of adhesion (adhesion area) during adhesion, and can make the adhesion state between the image element case 86 and the lens barrel 39 stronger. In addition, this adhesion amount spreads in a plane substantially parallel to the optical axis AA, and does not substantially spread in a direction perpendicular to the optical axis AA.

Hereinafter, referring to FIG. 7 and the like, the bonded state and bonded operation of the video element case 86 and the lens barrel 39 will be described. 7(A) to 7(C) are diagrams schematically shown for explaining the parts related to bonding in the structure of the image element housing 86 and the lens barrel 39 , and FIG. 7(A) is 7(B) is a side view, and FIG. 7(C) is a top view of schematic cross-sectional views for explaining the adhesion between the lens barrel 39 and the image element housing 86 . As shown in (A) to (C) of FIG. The portion 39p and the stepped portion ST are filled without gaps. In addition, the adhesive PT is an ultraviolet curable resin, and is cured by irradiation with ultraviolet light, thereby bonding the video element case 86 and the lens barrel 39 . At this time, as shown in FIG. 7(B), the planar portion 39p constituting the connecting portion CN and the pair of upper portion 87a and lower portion 87b constituting the plate portion 87 extend substantially parallel to each other, thereby sandwiching The adhesive PT fully expands, and the adhesive force becomes firm. In addition, as shown in FIG. 7(A) and 7(C), by the existence of the stepped portion ST, the convex rib PRa, and the slit-shaped portion SLa, etc., the bonding area is also sufficiently set to ensure sufficient bonding required. force.

Hereinafter, details of the bonding step will be described with reference to FIG. 8 . 8(A) to 8(C) are diagrams corresponding to the side view shown in FIG. 7(B) . In addition, as shown in (A) and (B) of FIG. 5 , before the bonding process, the light guide device 20 has been installed on the lens barrel 39 , that is, the projection lens 30 is connected to the guide through the lens barrel 39 . The state in which the optical device 20 is connected is omitted here. First, as shown in (A) of FIG. 8, the lens barrel 39 is prepared, and then, as shown in (B) of FIG. The adhesive PT of the bonding part PP. Next, the image element case 86 is brought close to the lens barrel 39 side in a state in which the plate-like portion 87 faces the connecting portion CN along the optical axis AA of the lens barrel 39 . Then, as shown in (C) of FIG. 8 , the upper portion 87 a and the lower portion 87 b constituting the plate portion 87 cooperate with the flat portion 39 c provided correspondingly to them, and are adhered with the adhesive PT interposed therebetween. catch. That is, the adhesive PT is filled in the bonding region formed by the plate-like portion 87 and the planar portion 39c. In this process, position adjustment is performed while confirming an image that is projected through the projection lens 30 and the light guide device 20 through the image light emitted from the image display element 82 housed in the image element case 86 . the resulting image. After the optimal position is determined, the state is maintained, and ultraviolet light is appropriately irradiated from the direction indicated by the arrow A1 in FIG. 7(A), so that the adhesive PT is cured and bonded. In addition, in the step of applying the adhesive in the above steps, by applying the adhesive PT to the connection portion CN side of the lens barrel 39 having the stepped portion ST, the adhesive PT remains in the stepped portion ST, This prevents the adhesive PT from reaching the projection lens 30 and the image display element 82 with optical functions.

In the bonding process as described above, as shown in (B) of FIG. In the method of aligning at the same time as PT, set the gap as the adjustment amount. Specifically, the plate-shaped portion 87 and the main body portion 86a of the image element case 86 form a concave fitting portion RE, while the connecting portion CN in the lens barrel 39 has a convex shape corresponding to the fitting portion RE. There is a gap between the connection part CN and the fitting part RE. In the case of illustration, the dimensional width SZ1 of the connecting portion CN is slightly smaller than the dimensional width SZ2 of the fitting portion RE. That is, the connection part CN and the fitting part RE become the adjustment structure part which can adjust a relative position. As a result, between the plate-like portion 87 and the planar portion 39p, gaps are formed in which relative positions can be adjusted in the horizontal direction corresponding to the lateral direction in which the viewer's eyes are arranged, and in the vertical direction corresponding to the longitudinal direction perpendicular to the lateral direction.

As described above, the alignment of the video display element 82 with respect to the projection lens 30 and the like can be performed, thereby making it possible to adjust so that the image entering the observer's eye position becomes a design value. For example, in the vertical vertical direction, which corresponds to the vertical direction perpendicular to the horizontal direction in which the observer's eyes are aligned, it is desirable to suppress the deviation between the right eye side and the left eye side to within about 50 μm. This is because when there is a difference of 50 μm or more in the vertical direction, that is, the vertical direction, the deviation of the images on the right eye side and the left eye side cannot be combined in the brain, resulting in discomfort. In addition, for example, the adjustment in the horizontal direction corresponding to the horizontal direction in which the observer's eyes are arranged is necessary to make the overlapping state and parallax of the image on the right eye side and the image on the left eye side appropriate. For example, in the case of forming a 3D image using left and right parallax, if the deviation in the horizontal direction is too large, it may not be possible to properly visually recognize the stereoscopic image in which the double-layer image is seen. In addition, for example, the following cases are also considered: the relationship between the angle of view and the distance is deviated, and the appearance of the near image (e.g. equivalent to the 80-type image 5m ahead) and the appearance of the distant image (e.g. equivalent to 20m ahead image at 320) looks misaligned. In this embodiment, for example, in the state where the lens barrel 39 and the light guide device 20 have been installed on the left and right sides of the aluminum die-casting frame 107, sensors are respectively placed at positions corresponding to the positions of the left and right eyes, and the sensors pass through to enter the left and right eyes. The relative positions of the left and right video display elements 82 and the projection lens 30 are adjusted so that the image at the position becomes the design value, and the above-mentioned vertical and horizontal directions can be aligned to achieve a desired state.

Details of functions, operations, etc. of the projection see-through device 70 and the like will be described with reference to FIG. 9 . The light guide member 10 that is a part of the light guide device 20 in the projection see-through device 70 is an arc-shaped member that curves along the face in plan view. In the light guide member 10, the first light guide part 11 is disposed near the central side of the nose, that is, on the light emitting side, and has a first surface S11, a second surface S12, and a third surface S13 as side surfaces having optical functions, and the second surface S11 has optical functions. The light guide part 12 is arranged 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 S16 as side surfaces having optical functions. Among them, the first surface S11 is adjacent to the fourth surface S14, the third surface S13 is adjacent to the fifth surface S15, and the second surface S12, the fourth surface S14 and the fifth surface are arranged between the first surface S11 and the third surface S13. A sixth surface S16 is arranged between the surfaces S15.

In the light guide member 10, the first surface S11 is a free-form surface with the output-side optical axis AX0 parallel to the Z axis as the central axis, and the second surface S12 is a free-form surface with the optical axis AX1 as the central axis. The third surface S13 is a free-form surface whose central axis is the emission-side optical axis AXO, and is included in a reference plane (cross section shown in the figure) parallel to the XZ plane and inclined with respect to the Z-axis. The 4th surface S14 is a free-form surface having a bisector of a pair of optical axes AX3 and AX4 as a central axis. The pair of optical axes AX3 and AX4 are included in the above-mentioned reference plane parallel to the XZ plane and are inclined with respect to the Z axis. The 5th surface S15 is a free-form surface having a bisector of a pair of optical axes AX4 and AX5 as a central axis. The pair of optical axes AX4 and AX5 are included in the above-mentioned reference plane parallel to the XZ plane and are inclined relative to the Z axis. The sixth surface S16 is a free curved surface having the optical axis AX5 as the center axis, and the optical axis AX5 is included in the above-mentioned reference plane parallel to the XZ plane and is inclined with respect to the Z axis. In addition, the above-mentioned first to sixth surfaces S11 to S16 have a symmetrical shape with respect to the vertical (or longitudinal) Y-axis direction with respect to the reference plane (illustrated cross section) through which the optical axes AX1 to AX5 and the like pass. The reference plane extends horizontally (or laterally) and is parallel to the XZ plane.

The main body 10s of the light guide member 10 is formed of a resin material exhibiting high light transmittance in the visible light range, and is molded, for example, by injecting a thermoplastic resin into a mold and curing it. Moreover, as a material of the main body 10s, cycloolefin polymer etc. can be used, for example. The main body 10s is integrally formed, but it is also conceivable to divide the light guide member 10 into the first light guide part 11 and the second light guide part 12 . The first light guide portion 11 can guide and emit the image light GL, and can see through the external light HL. The second light guide portion 12 can realize incident and waveguiding of the image light GL.

In the first light guide part 11, the first surface S11 functions as a refraction surface that emits the image light GL out of the first light guide part 11, and also serves as a total reflection surface that totally reflects the image light GL on the inner surface side. function. The first surface S11 is arranged in front of the eye EY, and is formed in a concave shape with respect to the observer. In addition, the first surface S11 is a surface formed of 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 this surface. The half mirror layer 15 is a light-transmitting reflective film (that is, a semi-transparent reflective film). The half mirror layer (semi-transmissive reflection film) 15 is not formed on the whole of the second surface S12, but is formed on a partial area PA, which is mainly along the vertical direction of the Y-axis on the second surface S12. narrow area of direction. The half mirror layer 15 is formed by forming a metal reflective film or a dielectric multilayer film on a partial area PA in the base surface of the main body 10s. From the viewpoint of easy see-through observation of the external light HL, the reflectance of the half mirror layer 15 with respect to the image light GL is not less than 10% and not more than 50% within the assumed incident angle range of the image light GL. In a specific embodiment, the reflectance of the half mirror layer 15 to the image light GL is set to 20%, for example, and the transmittance to the image light GL is set to 80%, for example.

The third surface S13 functions as a total reflection surface that totally reflects the image light GL on the inner surface side. The third surface S13 is arranged in front of the eyes EY, and like the first surface S11, has a concave shape with respect to the observer, and has a diopter of approximately 0 when the external light HL is observed through the first surface S11 and the third surface S13. In addition, the third surface S13 is a surface formed of 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 image light GL on the inner surface side. In addition, the fourth surface S14 is a surface formed of the hard coat layer 27 applied to the surface of the main body 10s.

As already mentioned, in the 2nd light guide part 12, 5th surface S15 is formed by forming the light reflection film RM which consists of inorganic materials on the surface of main body 10s, and it functions as a reflection surface.

The sixth surface S16 functions as a refraction surface for making the image light GL incident into the second light guide portion 12 . In addition, the sixth surface S16 is a surface formed by the hard coat layer 27 applied to the surface of the main body 10s.

The light transmission member 50 is fixed integrally with the light guide member 10 as described above to form one light guide device 20 . The light transmission member 50 is a member (auxiliary optical module) that assists the see-through function of the light guide member 10 , and has a first transmission surface S51 , a second transmission surface S52 , and a third transmission surface S53 as side surfaces having optical functions. 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 located on a curved surface extending the first surface S11 of the light guide member 10, the second transmission surface S52 is a curved surface integrated with the second surface S12 by bonding the adhesive layer CC, and the third transmission surface S52 is a curved surface formed by extending the first surface S11 of the light guide member 10. The surface S53 is located on a curved surface extending the third surface S13 of the light guide member 10 . Among them, since the second transmissive surface S52 and the second surface S12 of the light guide member 10 are integrated by bonding through the thin adhesive layer CC, they have shapes with substantially the same curvature.

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

The image display device 80 includes: an illumination device 81 that emits two-dimensional illumination light SL; an image display element 82 that is a transmission type spatial light modulator; and a drive control unit for controlling the operations of the illumination device 81 and the image display element 82. 84.

The illuminating device 81 of the image display device 80 has: a light source 81a that generates light of three colors including red, green, and blue; The image display element 82 is an image element formed of, for example, a liquid crystal display device, and spatially modulates the illumination light SL from the illumination device 81 to form image light to be displayed as a moving image or the like. The drive control unit 84 includes a light source drive circuit 84a and a liquid crystal drive circuit 84b. The light source drive circuit 84a supplies electric power to the light source 81a of the lighting device 81 to emit illumination light SL with stable luminance. The liquid crystal drive circuit 84 b outputs an image signal or a drive signal to the video display element (video element) 82 , thereby forming colored video light or image light that is the basis of a moving image or a still image as a transmittance pattern. In addition, although the liquid crystal drive circuit 84b may have an image processing function, an external control circuit may also have an image processing function.

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

The image light GL passing through the sixth surface S16 of the light guide member 10 is converged and advances, and is reflected by the fifth surface S15 having relatively weak positive refractive power when passing through the second light guide part 12, and is The fourth surface S14 of relatively weak negative power reflects.

The image light GL reflected by the fourth surface S14 of the second light guide part 12 enters the third surface S13 having a relatively weak positive refractive power in the first light guide part 11 and is totally reflected, and enters the Total reflection occurs on the first surface S11 having relatively weak negative refractive power. In addition, the image 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 light GL totally reflected by the first surface S11 is incident on the second surface S12, and in particular, the image light GL incident on the half mirror layer 15 is partially transmitted through the half mirror layer 15 and partly reflected to enter again. To the first surface S11 and pass through the first surface S11. In addition, the half mirror layer 15 functions as a structure having relatively strong positive refractive power with respect to the image light GL reflected here. In addition, the first surface S11 functions as a structure having negative refractive power with respect to the image light GL passing through the first surface S11.

The video light GL having 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 the image formed on the video display element (video element) 82 with the video light GL which is a virtual image.

On the other hand, in the external light HL, the light incident on the -X side of 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 part 11, but at this time , the positive and negative optical powers are offset and the aberrations are corrected. That is, the observer observes an external image with less distortion through the light guide member 10 . Similarly, in the external light HL, the light incident on the +X side of the second surface S12 of the light guide member 10, that is, the light incident on the light transmissive member 50 passes through the third transmissive surface S53 and the first transmissive surface S53 provided there. When the surface S51 is transmitted, the positive and negative optical powers are offset and the aberration is corrected. That is, the observer observes an external image with less distortion through the light transmitting member 50 . In addition, in the external light HL, when the light incident on the light transmission member 50 corresponding to the second surface S12 of the light guide member 10 passes through the third transmission surface S53 and the first surface S11, the positive and negative refractive powers are offset and Aberrations are corrected. That is, the observer observes an external image with less distortion through the light transmission member 50 . In addition, both the second surface S12 of the light guide member 10 and the second transmissive surface S52 of the light transmissive member 50 have approximately the same curved surface shape, and both have approximately the same refractive index, and the gap between the two is formed by a material having approximately the same refractive index. Adhesive layer CC filled. 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 function as refraction surfaces with respect to the external light HL.

However, since a part of the external light HL incident on the half mirror layer 15 passes through the half mirror layer 15 and partly is reflected, the external light HL from the direction corresponding to the half mirror layer 15 passes through the half mirror layer 15 The transmittance of 15 is weakened. On the other hand, since the image light GL enters from the direction corresponding to the half mirror layer 15, the observer observes the image formed on the image display element (image element) 82 and the external image in the direction of the half mirror layer 15. .

Of the image light GL that propagates in the light guide member 10 and is incident on the second surface S12, the light that is not reflected by the half mirror layer 15 enters the light transmission member 50. The antireflection part shown in the figure prevents it from returning to the light guide member 10 . That is, the image light GL passing through the second surface S12 is prevented from returning to the optical path and becoming stray light. In addition, although the external light HL incident from the side of the light-transmitting member 50 and reflected by the half mirror layer 15 returns to the light-transmitting member 50, it is prevented from being emitted by the above-mentioned unillustrated anti-reflection part provided on the light-transmitting member 50. to the light guide member 10. That is, it prevents the external light HL reflected by the half mirror layer 15 from returning to the optical path and becoming stray light.

As can be seen from the above description, according to the virtual image display device 100 of this embodiment, the relative position of the image display element 82 as an image element and the projection lens 30 as a projection optical system can be adjusted through the plate-shaped portion 87 and the connecting portion CN. Furthermore, the image element case 86 accommodating the image display element 82 and the lens barrel 39 accommodating the projection lens 30 are bonded together. Therefore, even if deviations occur in the optical system due to manufacturing errors or the like in the projection lens 30 , the deviations can be corrected during alignment of the projection lens 30 and the image display element 82 to perform reliable device alignment. In this case, it is possible to reduce the size of the device compared to, for example, the conventional method of aligning the four corners of the outer end of the image element or the like by using a pin and a hole to provide a gap-fitting portion. . Moreover, it becomes a simple structure compared with the case which has a fitting part as mentioned above.

As mentioned above, although this invention was demonstrated with reference to embodiment, this invention is not limited to said embodiment, It can implement in various forms in the range which does not deviate from the summary, For example, the following deformation|transformation is also possible.

In the above description, the image element case 86 has the plate-shaped portion 87 and the lens barrel 39 has the connecting portion CN, but the lens barrel 39 may have the plate-shaped portion 87 extending toward the image element case 86 on the contrary. The image element case 86 has a connecting portion CN including a planar portion provided corresponding to the plate portion 87 .

In the above description, one convex rib PRa and one slit-shaped portion SLa are provided on the central side. Rib PRa, etc., can also be applied in various sizes (depths).

In addition, in the above description, virtual image display devices such as HMDs have been described, but the utility model of the present application is not limited to virtual image display devices. It is also applicable to projectors and the like. FIG. 10 is a diagram schematically showing a liquid crystal projector 200 incorporated in a small electronic device PD such as a portable terminal. Specifically, the projector 200 includes an image display device 280 in which an image display element (image element) 282 is accommodated in a main body portion 286 a of an image element housing 286 , and a lens barrel 239 in which a projection lens 230 serving as a projection optical system is accommodated. The image element housing 286 constituting the image display device 280 is composed of an upper part 287a and a lower part 287b, which are connecting parts CN from both ends of the main body part 286a toward the lens barrel 239, respectively. A pair of opposing flat plate-like parts extending sideways. In addition, the projector 200 is connected to the main body of the electronic device PD via the cable CB, inputs various signals such as image signals, forms an image on the video display element 282 based on the input image signal, and projects video light GL to be transmitted by the projection lens. The image formed at 230 is projected onto the screen surface SC. In this case, the relative position of the image display element 282 and the projection lens 230 is adjusted through the connection part CN between the plate-like portion 287 of the image element case 286 and the lens barrel 239, and the image element case 86 that accommodates the image display element 282 It is adhered while being aligned with the lens barrel 39 that accommodates the projection lens 30 . In addition, since projector 200 can be compactly designed, it can be easily incorporated into a small electronic device PD. In addition, an example in which the projector 200 is incorporated in the electronic device PD is shown in the figure, but the present invention is not limited thereto, and a configuration in which the projector 200 is externally mounted in the electronic device PD may also be adopted. In this case, since the projector 200 can be made small, it is less likely to become an obstacle even if it is mounted on the outside, and it is easy to use when there is a restriction on the installation place, for example.

In addition, in the above description, the frame 107 and the projection lens 30 of the virtual image display device 100 are separated, and the projection lens 30 is fixed to the frame 107 by screw fastening. 107 integrally formed. As a method of integrally molding the lens barrel 39 and the frame 107, there are methods such as injection molding on a substrate, compression molding, and then cutting out the lens barrel portion.

As for the light guide device 20 or the projection lens 30 , it is not limited to fastening by screw fastening, but can be fixed to the frame 107 by various methods.

In the above description, the restricting portion 107n and the rib 10n are elongated, but these members can be shortened, and a plurality of sets of the restricting portion 107n and the rib 10n can also be provided. In addition, when the enlarged width portion 10q is unnecessary in the rib 10n and the enlarged width portion 10q is omitted, the enlarged width portion 107q may also be omitted in the groove 107s of the restricting portion 107n. Furthermore, the restricting portion 107n is not limited to a concave portion such as the groove 107s, and may be, for example, a protrusion or a convex line arranged differently along the rib 10n.

In the above description, the frame 107 is provided with the restricting portion 107n, but a restricting portion for preventing deformation, shaking, etc. of the light guide member 10 may be provided on the protecting portion 108 instead of or together with it. The restriction portion formed on the protection portion 108 side locks the lower rib 10o by, for example, clearance fitting.

In the above description, the protection part 108 is attached to the frame 107, but the protection part 108 may be omitted. In this case, the frame 107 as shown in FIG. Frame 107 for accessories. The above-mentioned auxiliary member can be used as a member for protecting the light guide device 20 similarly to the longitudinal portion 63 a of the protecting portion 108 . In addition, the frame 107 and the protection part 108 may be integrally produced.

In the above embodiments, the projection lens 30 is disposed on the light incident side of the light guide member 10 , but the projection lens 30 may be omitted and the light guide member 10 itself has an imaging function. In addition, another light guide member 10 having an imaging function may also be configured instead of the projection lens 30 . In this case, after assembling the light guide member 10 to the lens barrel 39 , the lens barrel 39 and the image element case 86 are assembled.

In the above-mentioned embodiment, the locking member (connecting part) 39a that engages with the light guide device 20 is provided on the lens barrel 39 that accommodates the projection lens 30, but it may be provided on the side of the light guide device 20 to sandwich the lens barrel, for example. 39 is a locking part that fits with the lens barrel 39.

In the above-described embodiments, the half mirror layer (semi-transmissive reflection film) 15 is formed in a laterally long rectangular region, but the profile of the half mirror layer 15 can be appropriately changed according to the application or other uses. In addition, the transmittance and reflectance of the half mirror layer 15 can also be changed depending on the application or other factors.

In the above embodiments, the half mirror layer 15 is a simple semitransparent film (for example, a metal reflective film or a dielectric multilayer film), but the half mirror layer 15 may be replaced by a flat or curved hologram element.

In the above-described embodiment, the distribution of display luminance of video display element 82 is not particularly adjusted, but it is possible to adjust the distribution of display luminance to be non-uniform when, for example, a difference in luminance occurs depending on the position.

In the above-mentioned 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 is not limited to the video display device composed of a transmissive liquid crystal display device or the like. 82, and various structures can be utilized. For example, a reflective liquid crystal display device may be used, or a digital micromirror device or the like may be used instead of the image display element 82 composed of a liquid crystal display device or the like. In addition, as the image display device 80 , a self-luminous element typified by an LED array, an OLED (organic EL), or the like can be used.

In the above description, the virtual image display device 100 including the pair of display devices 100A and 100B has been described, but it may be a single display device. That is, it may also be configured such that instead of providing a set of projection see-through devices 70 and image display devices 80 corresponding to both the right eye and the left eye, the projection see-through device 70 and the image display device 80 are provided only for either the right eye or the left eye. The display device 80 is used to observe the image with one eye. In this case, the frame 107 and the leg part 104 have the shape arrange|positioned bilaterally symmetrically in the state shown in FIG. 1 etc., for example.

In the above description, the distance between the pair of display devices 100A, 100B in the X direction is not described, but the distance between the two display devices 100A, 100B is not limited to be fixed, and the distance can also be adjusted by mechanical mechanisms or the like. That is, if a telescoping mechanism or the like is provided on the frame 107, the distance between the two display devices 100A, 100B in the X direction can be adjusted according to the wearer's eye width or the like.

In the above-mentioned embodiment, on the first surface S11 and the third surface S13 of the light guide member 10, processing such as a mirror surface or a half mirror is not performed on the surface, but the image light is totally reflected by the interface with the air. However, the total reflection of the virtual image display device 100 of the utility model of the present application also includes the reflection in which a mirror coating or a half mirror film is formed on the whole or part of the first surface S11 or the third surface S13. For example, it also includes the case where the incident angle of image light satisfies the condition of total reflection, and the whole or part of the first surface S11 or the third surface S13 is mirror-coated to reflect substantially all the images. Light. In addition, if video light with sufficient brightness can be obtained, the whole or part of the first surface S11 or the third surface S13 may be coated with a slightly transmissive mirror.

In the above description, the light guide member 10 and the like extend in the lateral direction in which the eyes EY are arranged, but they may be arranged so that the light guide member 10 extends in the longitudinal direction. In this case, the light guide member 10 is supported, for example, in a cantilever state on the upper side.

Claims (14)

1. A virtual image display device, which has: image element; an image element housing, which accommodates and supports the image element; a projection optical system that projects light from the imaging element; a lens barrel, which accommodates and supports at least a part of the projection optical system, and is connected to the image element casing by bonding; and a light guiding device which directs light from said projection optical system towards the eyes of an observer so that the observer sees an image, One of the image element housing and the lens barrel has a plate-shaped portion that is provided to protrude toward the other side and form an adhesive region when the other is adhered, The other of the image element housing and the lens barrel has a connection portion including a planar portion provided corresponding to the plate-shaped portion and forming an adhesive region, and in the planar portion, the connection A portion cooperates with the plate-like portion to bond them while enabling adjustment of the relative positions of the image element and the projection optical system. 2. The virtual image display device according to claim 1, wherein, The plate-like portion and the planar portion respectively extend approximately parallel to an optical axis in the lens barrel. 3. The virtual image display device according to claim 1 or 2, wherein, The plate-like portion is formed to extend toward the lens barrel side as a part of the image element housing, The planar portion is formed as a part of a side surface of the lens barrel. 4. The virtual image display device according to claim 3, wherein, The lens barrel has a plurality of the planar portions in the connecting portion, and a stepped portion is formed between the planar portions. 5. The virtual image display device according to claim 1 or 2, wherein, The plate-shaped portion has a slit-shaped portion, and the connecting portion has a convex rib provided corresponding to the slit-shaped portion. 6. The virtual image display device according to claim 1 or 2, wherein, The image element case is U-shaped, and has a main body for accommodating the image element, and a pair of opposing plate-shaped portions extending from both ends of the main body toward the lens barrel. 7. The virtual image display device according to claim 6, wherein, The imaging element is configured to the side of the observer's head when worn, There are a pair of opposing plate-like portions in the image element housing, The plate-shaped portions respectively extend from both ends of the main body portion toward the lens barrel side in a vertical direction corresponding to a longitudinal direction perpendicular to a lateral direction in which eyes of an observer are aligned. 8. The virtual image display device according to claim 1 or 2, wherein, The image element housing and the lens barrel are bonded with an ultraviolet curable resin in a bonded region formed by the plate-like portion and the connecting portion. 9. The virtual image display device according to claim 1 or 2, wherein, The image element is a liquid crystal display device that spatially modulates illumination light to form image light. 10. The virtual image display device according to claim 1 or 2, wherein, The lens barrel has a connecting portion that is connected to the light guide device on a light exit side to integrate an optical system from the projection optical system to the light guide device. 11. The virtual image display device according to claim 10, wherein, The plate-like portion and the planar portion enable adjustment of the position of the imaging element in a state coupled to the light guide device via the lens barrel. 12. The virtual image display device according to claim 1 or 2, wherein, The image element housing and the lens barrel have an adjustment structure portion that forms an adjustment amount that enables, between the plate-like portion and the flat portion, at a distance corresponding to the alignment of the observer's eyes. The horizontal direction of the horizontal direction and the vertical direction of the vertical direction corresponding to the horizontal direction are adjusted. 13. A projector, wherein the projector has: image element; an image element housing, which accommodates and supports the image element; a projection optical system that projects light from the image element; and a lens barrel, which accommodates and supports at least a part of the projection optical system, and is connected to the housing of the image element by bonding, One of the image element housing and the lens barrel has a plate-shaped portion that is provided to protrude toward the other side and form an adhesive region when the other is adhered, The other of the image element housing and the lens barrel has a connection portion including a planar portion provided corresponding to the plate-shaped portion and forming an adhesive region, and in the planar portion, the connection A portion cooperates with the plate-like portion to bond them while enabling adjustment of the relative positions of the image element and the projection optical system. 14. The projector of claim 13, wherein: The plate-like portion and the planar portion respectively extend approximately parallel to the optical axis of the lens barrel.