JP6696203B2 - Virtual image display device, video element unit, and method for manufacturing video element unit - Google Patents

Description

  The present invention relates to a virtual image display device for presenting an image formed by an image display element or the like to an observer, an image element unit, and a method for manufacturing the image element unit.

  As a virtual image display device such as a head mounted display (hereinafter, also referred to as an HMD) attached to an observer's head, one in which a liquid crystal display panel is applied to an image display element (video element) is known (for example, a patent document). Reference 1). When an image is formed on the liquid crystal display panel, a light source such as a backlight is required separately, and a space for securing the light source is required. Under such circumstances, there is known a structure in which a liquid crystal display panel is sandwiched between two cases in order to realize miniaturization (see Patent Document 1).

  On the other hand, in order to meet the demand for further miniaturization, it can be considered to apply a self-luminous image element that does not require a separate light source.

  However, for example, a self-luminous image device such as an organic EL (OLED) panel has a structure in which a light emitting source is provided inside the panel substrate and further a driving driver IC, a power supply device, etc. are built in, so that an internal temperature Is easy to rise. In particular, in the case of an organic EL, it can be considered that, as its characteristics, the performance deterioration and the shortening of the life with the rise of the internal temperature become remarkable.

JP, 2014-191013, A

  The present invention provides a virtual image display device, a video element unit, and a video device that has a self-luminous video element to reduce the size and weight of the entire apparatus while maintaining the performance of the video element and enabling good image formation. It is an object to provide a method for manufacturing an element unit.

  A virtual image display device according to the present invention includes a video device including a light emitting unit that generates video light, and a case unit that houses the video device. The case unit is the opposite side of the video device from which the video light is emitted. Has a heat dissipation structure that releases heat.

  In the above virtual image display device, the video element is a self-luminous element including a light emitting portion for generating video light, and does not require a separate light source. The overall weight and size can be reduced. Further, the case portion has a heat dissipation structure portion that releases a part of the image element to dissipate the heat, thereby suppressing an increase in the internal temperature of the image element. Even if the image element is a self-luminous type, the internal temperature is increased. It is possible to avoid deterioration in performance and shorten the life, and to form a good image.

  In a specific aspect of the present invention, the case portion is a one-member configuration that forms an opening that opens a part of the image element in the heat dissipation structure portion. In this case, by providing an opening to ensure the heat dissipation of the image element, it is possible to simplify the configuration of the image element and its surroundings while maintaining the necessary functions.

  In another aspect of the present invention, in the video device, the organic EL device forming the light emitting unit is formed on the silicon substrate, and in the case unit, the heat dissipation structure unit radiates heat by opening the back surface of the silicon substrate. In this case, efficient heat dissipation is possible from the back surface of the silicon substrate. When the back surface of the silicon substrate is opened, for example, the whole back surface is exposed, or a part of the back surface is exposed and another part is in contact with another member (for example, a case Part of the portion may contact the back surface to support and fix the silicon substrate).

  In still another aspect of the present invention, the video element is positioned in contact with the case portion on the end surface other than the back surface of the silicon substrate. In this case, by utilizing the accuracy of dicing in forming the end surface of the silicon substrate, it is possible to perform highly accurate positioning, and it is possible to suppress the adjustment range in the assembly of the image element to other members, and to reduce the size of the entire apparatus. Can be promoted.

  In still another aspect of the present invention, the case portion has a video element positioning portion that abuts on a position other than a position where the video device is opened to determine a storage position of the video device. In this case, highly accurate positioning can be performed while ensuring the heat dissipation of the video element.

  In still another aspect of the present invention, the image element positioning portion has a planar shape or a protrusion shape. In this case, for example, in the manufacturing process, the alignment can be performed by abutting the corresponding portion of the image element with the image element positioning portion having a planar shape or a protrusion shape.

  According to still another aspect of the present invention, a heat radiating portion for radiating the exposed portion of the image element opened by the heat radiating structure is further provided. In this case, the heat dissipation portion can further promote heat dissipation from the exposed portion.

  In still another aspect of the present invention, the heat dissipation part is a heat conduction tape attached to the exposed part. In this case, it is possible to radiate heat from the back surface of the silicon substrate to any place where the heat conductive tape is attached.

  In yet another aspect of the present invention, the case portion is made of metal. In this case, the heat dissipation in the case part can be improved.

  In still another aspect of the present invention, the case portion has a mask portion that covers a part of the surface of the image element on the side from which image light is emitted, and an attachment portion for performing attachment alignment with other optical components. .. In this case, the case portion has a mask function of blocking unnecessary light and an alignment function at the time of attachment to other optical components.

  In still another aspect of the present invention, there is an adhesive portion formed of a high heat conductive silicone adhesive or a heat conductive epoxy adhesive and fixing the image element and the case portion. In this case, it is possible to enhance the heat dissipation in the adhesive portion that connects the image element and the case portion.

  In still another aspect of the present invention, a light guide member that guides image light from the image element by total reflection on a plurality of surfaces and a projection optical system that makes image light from the image element incident on the light guide member are further provided. Prepare In this case, the image light from the image element can be guided in front of the observer's eyes by the light guide member and the projection optical system.

  A video element unit according to the present invention includes a video element including a light emitting section for generating video light, and a case section for housing the video element, and the case section is the opposite side of the video element from which the video light is emitted. And a video element positioning section that abuts on a location other than the location where the video element is opened to determine the storage position of the video element.

  In the video element unit, the video element is a self-luminous element including a light emitting portion that generates video light and does not require a separate light source. The element unit can be made lighter and more compact, and the case portion has a heat dissipation structure that radiates heat by opening a part of the image element, thereby suppressing an increase in the internal temperature of the image element. Even if it is a self-luminous type, it is possible to avoid deterioration of performance and shortening of life due to increase in internal temperature, and it is possible to form an excellent image.

  A method of manufacturing a video element unit according to the present invention includes a video element including a light emitting portion that generates video light, and a case portion that houses the video element, and the case portion is a side of the video element that emits the video light. Is a method for manufacturing a video element unit having a heat dissipation structure section that opens the opposite side to radiate heat, and a video element positioning section that abuts on a location other than the location where the video element is opened to determine the storage location of the video element. Then, an adhesive for fixing the image element is applied in the image element positioning section of the case section, and the image element and the case section are aligned while the image element is opened in the heat dissipation structure section. To fix it.

  In the method of manufacturing a video element unit, in the manufacturing of a self-luminous video element unit capable of forming a good image while avoiding performance deterioration and life shortening due to an increase in internal temperature while achieving weight reduction and size reduction, It is possible to perform simple and reliable assembly while ensuring high heat dissipation in the heat dissipation structure.

It is a perspective view explaining an appearance of an example of a virtual image display device concerning an embodiment. It is a figure which explains notionally the optical path of image light. FIG. 6 is a perspective view showing how the display device unit is attached to a projection lens. It is a perspective view which shows the appearance of the structure of the display part of a virtual image display apparatus. (A) is a perspective view showing the external appearance of the display device unit, and (B) is a perspective view showing the display device unit of (A) as viewed from another angle. (A) is a front view of a display device unit, (B) is a side view, (C) is a rear view. (A) is a side sectional view of the display device unit, and (B) is a side sectional view of the case portion. (A) And (B) is a figure for demonstrating the positioning reference | standard in the assembly of a display apparatus unit. (A)-(E) is a figure for demonstrating an example of the manufacturing process of a display apparatus unit. (A) is a conceptual diagram for explaining a modified example of the positioning structure inside the display device unit, and (B) is another modified example of the positioning structure inside the display device unit. It is a conceptual diagram for explaining. (A) is a conceptual diagram for explaining another modification of the display device unit, and (B) is a cross-sectional view taken along the arrow of (A).

  Hereinafter, with reference to FIG. 1 and the like, one embodiment of a virtual image display device incorporating a display device unit which is a video device unit according to the present invention will be described in detail.

  As shown in FIG. 1, the virtual image display device 100 of the present embodiment is a head mounted display (HMD) having an appearance like glasses, and a virtual image is displayed to an observer or a user wearing the virtual image display device 100. The image light (image light) can be visually recognized, and the observer can visually see or observe the external image in a see-through manner. The virtual image display device 100 includes a first display device 100A, a second display device 100B, and a frame unit 102.

  The first display device 100A and the second display device 100B are portions that form a virtual image for the right eye and a virtual image for the left eye, respectively, and first and second optical members 101a and 101b that cover the front of the observer in a see-through manner. , And first and second image forming main body portions 105a and 105b, respectively. The first and second image forming main body portions 105a and 105b will be described later, but each of them is composed of an optical system for image formation such as a display device (video element) and a projection lens, a member that houses these optical systems, and the like. Has been done. Note that the display device (video element), the projection lens, and the like are supported and housed by being covered with the cover-shaped exterior member 105d. The first and second optical members 101a and 101b guide the image light formed by the first and second image forming main bodies 105a and 105b, and at the same time, allow the external light and the image light to overlap and be visually recognized. And constitutes a light guide device. Hereinafter, the first optical member 101a or the second optical member 101b is also referred to as the light guide device 20. It should be noted that the first display device 100A and the second display device 100B independently function as a virtual image display device.

  The frame portion 102 is an elongated member that is bent in a U shape in plan view, and is an integral part made of metal. Here, as an example, the frame portion 102 is made of a magnesium alloy, that is, the frame portion 102 is made of a magnesium frame, which is an integral part made of metal, as the main body portion 102p. Further, as shown in the figure, the frame portion 102 is provided at the center of a thick structure provided by being connected to both the first optical member 101a and the second optical member 101b (the light guide device 20 which is a pair of light guide portions). It has a portion 102a and a support body 102b extending from the central portion 102a along the first and second optical members 101a and 101b and forming a U-shaped bent portion.

  The central portion 102a fixes the relative positions of the first and second optical members 101a and 101b by sandwiching the tip ends thereof. In addition to this, the support body 102b forms first and second peripheral portions 102c and 102d which are portions bent in a U shape, and the first and second optical members are formed in the first and second peripheral portions 102c and 102d. By connecting (assembled) with 101a and 101b respectively, the mutual fixing is further strengthened.

  A temple 104, which is a hanging portion extending rearward from the left and right ends of the frame portion 102, is provided so that the temple 104 can be brought into contact with and supported by an observer's ear or temple. Further, the first and second image forming main body portions 105a and 105b may be added to the portion from the frame portion 102 to the temple 104.

  Hereinafter, an example of a structure for guiding the image light by the virtual image display device 100 and the like will be conceptually described with reference to FIG. 2. As described above, the devices for guiding the video light are the first display device 100A and the second display device 100B (see FIG. 1 and the like), but the first display device 100A and the second display device Since the device 100B has the same structure as the device 100B in the left-right symmetry, only the first display device 100A will be described, and the description of the second display device 100B will be omitted. As shown in FIG. 2, the first display device 100A includes an image display device 80 that forms image light, a projection lens 30 for imaging that is housed in a lens barrel portion, an image display device 80 and the projection lens 30. The light guide device 20 (first optical member 101a) that guides the passed image light. The light guide device 20 includes a light guide member 10 for light guiding and see-through, and a light transmitting member 50 for see-through.

  The image display device 80 can be, for example, a video element (video display element) including a self-luminous element such as an organic EL. Further, for example, in addition to a video display element (video element) that is a transmissive spatial light modulator, a lighting device (not shown) that is a backlight that emits illumination light to the video display element, and a drive control unit that controls the operation ( (Not shown) may be adopted. Although details will be described later with reference to FIG. 3 and the like, in the present embodiment, the image display device 80, which is a video element, is housed in a case portion and is unitized (modularized). Is aligned. Further, a unit in which the image display device (video element) 80 is housed in a case (modularized) is referred to as a display device unit (or a video element unit).

  The projection lens 30 is a projection optical system including, for example, a plurality of (for example, three) optical elements (lenses) arranged along the incident-side optical axis AX as constituent elements. It is stored and supported by (see FIG. 3 etc.). It should be noted that the optical element is constituted by an aspherical lens including both an axisymmetric aspherical surface (axisymmetric aspherical surface) and an axially symmetric aspherical surface (axisymmetric aspherical surface), for example, so that the light guide device It is possible to form an intermediate image corresponding to the display image inside the light guide member 10 in cooperation with a part of the light guide member 10 constituting the 20. The projection lens 30 projects the image light formed by the image display device 80 toward the light guide device 20 and makes it enter.

  As described above, the light guide device 20 includes the light guide member 10 for light guide and see-through, and the light transmitting member 50 for see-through. The light guide member 10 is a part of the prism type light guide device 20 and is an integral member, but is divided into a first light guide portion 11 on the light emitting side and a second light guide portion 12 on the light incident side. Can be grasped. The light transmission member 50 is a member (auxiliary optical block) that assists the see-through function of the light guide member 10, and is integrally fixed to the light guide member 10 to form one light guide device 20. The light guide device 20 is accurately positioned and fixed to the projection lens 30 by being screwed to the lens barrel portion 39 (see FIG. 3 and the like), for example.

  The light guide member 10 has first to fifth surfaces S11 to S15 as side surfaces having an optical function. Of these, the first surface S11 and the fourth surface S14 are continuously adjacent to each other, and the third surface S13 and the fifth surface S15 are continuously adjacent to each other. Further, the second surface S12 is arranged between the first surface S11 and the third surface S13. A half mirror layer is additionally provided on the surface of the second surface S12. The half mirror layer is a light-transmitting reflective film (that is, a semi-transmissive reflective film), and is formed by depositing a metal reflective film or a dielectric multilayer film, and the reflectance for image light is set appropriately. ..

  Hereinafter, the optical path of the image light (here, the image light GL) will be briefly described with reference to FIG. The light guide member 10 allows the image light GL to enter from the projection lens 30 and guides the image light GL toward the eyes of an observer by reflection on the first to fifth surfaces S11 to S15. Specifically, the image light GL from the projection lens 30 first enters the fourth surface S14 and is reflected by the fifth surface S15, and then again enters the fourth surface S14 from the inside and is totally reflected. It is incident on the surface S13 and totally reflected, and is incident on the first surface S11 and totally reflected. The image light GL totally reflected by the first surface S11 is incident on the second surface S12 and partially reflected while being partially transmitted through the half mirror layer provided on the second surface S12. It re-enters and passes through. The image light GL that has passed through the first surface S11 is incident on the observer's eye or its equivalent position as a substantially parallel light flux. That is, the observer observes the image with the image light as the virtual image.

  As described above, the light transmission member 50 is integrally fixed to the light guide member 10 to form one light guide device 20, and is a member (auxiliary optical block) that assists the see-through function of the light guide member 10. .. The light transmitting member 50 has a first transmitting surface S51, a second transmitting surface S52, and a third transmitting surface S53 as side surfaces having an optical function. The second transmission surface S52 is arranged between the first transmission surface S51 and the third transmission surface S53. The first transmission surface S51 is on a surface that is an extension of the first surface S11 of the light guide member 10, and the second transmission surface S52 is a curved surface that is joined and integrated with the second surface S12. The three-transmission surface S53 is on a surface that is an extension of the third surface S13 of the light guide member 10.

  As described above, the light guide device 20 allows the observer to visually recognize the image light by the light guide member 10 and causes the observer to observe the external image with less distortion by the cooperation of the light guide member 10 and the light transmission member 50. It has become a thing. That is, among the external light as the component light forming the external image to be visually recognized, one that is incident on the + X side of the second surface S12 of the light guide member 10 is the third surface S13 of the first light guide portion 11. Although passing through the first surface S11, at this time, the third surface S13 and the first surface S11 are planes substantially parallel to each other (diopter is substantially 0), so that aberration or the like hardly occurs. Further, among the external light, those that are incident on the −X side of the second surface S12 of the light guide member 10, that is, those that are incident on the light transmissive member 50 are the third transmissive surface S53 and the first transmissive surface provided on the light transmissive member 50. When passing through the transmissive surface S51, the third transmissive surface S53 and the first transmissive surface S51 are planes that are substantially parallel to each other, so that no aberration or the like occurs. Further, among the external light, the light incident on the light transmission member 50 corresponding to the second surface S12 of the light guide member 10 is the third transmission surface when passing through the third transmission surface S53 and the first surface S11. Since S53 and the first surface S11 are planes that are substantially parallel to each other, almost no aberration or the like occurs. As described above, the observer observes the distortion-free external image through the light transmitting member 50.

  The above-described configuration is the same in the second display device 100B (see FIG. 1 etc.). This makes it possible to form images corresponding to the left and right eyes, respectively.

  Hereinafter, the display device unit DU, which is a video element unit including the image display device (video element) 80, will be described with reference to FIG. 3 is a perspective view showing how the display device unit DU is assembled to the projection lens 30 (lens barrel portion 39). In the first display device 100A and the second display device 100B, the display device unit DU has a symmetrical and equivalent structure. Therefore, in FIGS. 3 and 4, only the left side is illustrated and described, and the right side is illustrated. Will not be described.

  As shown in FIG. 3, the display device unit DU is configured by accommodating the image display device (video element) 80 in a case portion 88 to form a unit (modularization). In other words, the image display device 80 is accommodated inside the casing-shaped case portion 88 by fitting, and is held so as not to move. In particular, in the present embodiment, as shown in the figure, the case portion 88 is provided with the heat dissipation structure portion 88a, so that the opposite side of the image display device 80 from the side from which the image light is emitted is opened and exposed. In this state, the image display device 80 is supported and fixed. Further, in the present embodiment, as shown in FIG. 4, a heat dissipation portion DP configured by directly adhering a heat conductive tape, for example, is provided on a portion of the back side portion of the image display device 80 exposed from the case portion 88. Thus, the heat dissipation of the image display device 80 is promoted. In the illustrated example, the heat dissipation portion DP formed of a heat conductive tape is attached so as to extend from the image display device 80 to the barrel portion 39 and further to the frame portion 102 which is a support frame.

  Here, when the so-called self-luminous image display device (video element) 80 as described above is applied to an HMD to form a high-luminance image, the panel substrate has a light emission source and is further driven. The driver IC and power supply device are built in. Therefore, the rise of the internal temperature is likely to be a problem. In particular, when an organic EL (OLED) panel is applied to the panel portion of the image display device (video element) 80 as in the present embodiment, there is a possibility that performance deterioration and shortening of life due to increase in internal temperature may become remarkable as a characteristic thereof. is there.

  In the present embodiment, in order to address the above problem, in the structure of the display device unit (video element unit) DU, particularly in the heat dissipation structure portion 88a of the case portion 88, a part of the silicon substrate SS that constitutes the image display device 80. The exposed state enables efficient heat dissipation by the heat dissipation part DP (see FIG. 4) composed of a heat conductive tape or the like, and further utilizes the end surface of the silicon substrate SS of the image display device 80. The case portion 88 and the image display device 80 have a structure for improving the assembling position accuracy.

  Hereinafter, with reference to FIG. 5 and the like, details of the structure of the display device unit (video element unit) DU, and the case portion 88 and the image display device 80 which configure the display device unit DU will be described.

  First, referring to FIGS. 5 (A), 5 (B), 6 (A) to 6 (C), FIGS. 7 (A) and 7 (B), an image display device 80 and a display device unit DU, The structure of the image display device 80 in the case portion 88 will be described. As illustrated, the image display device 80 has a rectangular plate-shaped main body portion 80a housed in the case portion 88, and an FPC (Flexible Printed Circuits) portion 80f connected and extended from the main body portion 80a. Of these, as shown in FIG. 7A, the main body portion 80a is an organic EL element including a silicon substrate SS on which various circuits and the like are arranged and which forms the outer shape of the main body portion 80a, and an organic EL material. In addition, the light emitting unit 80k for generating color light to be image light, and the protective glass GG for sealing which cooperates with the silicon substrate SS to seal the light emitting unit 80k are provided. The image display device 80 emits the image light toward the protective glass GG side, that is, the + z side by performing a light emitting operation according to the drive signal received from the FPC unit 80f. The image display device 80 is housed in the case portion 88 with a part of the main body portion 80a exposed as shown in the drawing and as described above. More specifically, the image display device 80 is supported and fixed in a state where the entire back surface SSr of the silicon substrate SS arranged on the side opposite to the side from which video light is emitted is exposed.

  Here, in the present embodiment, with respect to the configuration of the image display device 80, a silicon (Si) substrate is adopted as a self-luminous element substrate on which an organic EL (OLED) is mounted. As a result, first, high heat conductivity can be imparted to the above-mentioned heat dissipation, and highly efficient heat dissipation is possible. Further, it becomes possible to form a circuit having a fine structure, that is, a finer structure (for example, in the unit of several microns) in the production of the circuit board for forming the light emitting element. Furthermore, since the silicon substrate forms the outer shape of the image display device 80, each end surface of the silicon substrate can be separated by utilizing the high accuracy in dicing of silicon (for example, within a manufacturing error of several tens μ). By cutting out the image display device 80 with high accuracy and using the image display device 80 for positioning when the image display device 80 is housed in the case part 88, the positional accuracy with respect to the case part 88 (for example, much higher than that of the surface of the protective glass GG) is improved. It can be of precision. Further, as will be described later, the case portion 88 includes a display device unit (video element unit) DU having the image display device 80 built therein as another optical member (in the present embodiment, a lens barrel portion 39 for housing the projection lens 30). However, by maintaining the high accuracy inside the unit, the positional accuracy of the image display device 80 with respect to the projection lens 30 can be kept high as a result.

  Next, the structure of the case portion 88 of the image display device 80 and the case portion 88 that form the display device unit DU will be described. As shown in the drawing (see, for example, FIG. 7B), the case portion 88 has a frame structure having a through hole in the central portion, and a heat dissipation structure portion forming an opening OP for opening a part of the image display device 80. 88a, a display device positioning portion (video element positioning portion) 88b for positioning and fixing the image display device 80, and an image provided on the image light emission side which is the opposite side of the heat dissipation structure portion 88a and the display device positioning portion 88b. A mask portion 88m that removes unnecessary light of the component light emitted from the display device 80 and a projection member (fitting portion) 88u that is an attachment portion for performing attachment alignment with the lens barrel portion 39 (see FIG. 3 and the like). , 88v. The case portion 88 is, for example, a member made of a metal having high thermal conductivity such as aluminum or magnesium, and is a one-member structure formed by die casting or the like, that is, a structure composed of one member.

  For example, as shown in FIG. 6 (C) and FIG. 7 (B), in the case portion 88, the heat dissipation structure portion 88a is on the back side (the side opposite to the side where the image light is emitted), that is, the −z side in the figure. It is formed as a U-shaped (U-shaped) groove portion opened to the + y side, and the main body portion 80a of the image display device 80 is inserted from the + y side. Further, as described above, the case portion 88 has a frame structure having a through hole in the central portion, and the heat dissipation structure portion 88a forms the opening OP together with the U-shaped (U-shaped) groove portion. It has become a thing. That is, as shown in each drawing other than FIG. 7B, the entire back surface SSr of the silicon substrate SS is exposed by the opening OP. From the standpoint of the case portion 88, the case portion 88 has a heat dissipation structure portion 88a that opens the back surface SSr through the opening OP and radiates heat, so that the back surface SSr of the silicon substrate SS serves as an exposed portion by the heat dissipation structure portion 88a. There is.

  Further, in the case portion 88, a display device positioning portion (video element positioning portion) 88b that comes into contact with the image display device 80 to perform positioning is a flat surface portion that serves as a reference for positioning in the z direction, as illustrated. It is composed of a first reference plane SF1, a second reference plane SF2 that is a plane portion that serves as a positioning reference in the x direction, and a third reference plane SF3 that is a plane portion that serves as a positioning reference in the y direction. .. As shown in FIGS. 8A and 8B, these reference surfaces SF1 to SF3 are all end surfaces SS1 to SS3 other than the back surface SSr among the end surfaces of the rectangular plate-shaped silicon substrate SS. By abutting with, it is possible to perform highly accurate positioning.

  As described above, the case portion 88 configures the display device unit DU in which the image display device 80 is positioned and supported and fixed by fitting to accommodate the image display device 80 and is unitized (modularized). It is a member that forms an alignment portion for assembling the image display device 80, that is, the display device unit DU to the lens barrel portion 39.

  Further, the case portion 88 is provided with a pair of protrusion members 88u and 88v extending in parallel to the optical axis AX on the + z side (the side on which image light is emitted). These projection members 88u and 88v are loosely fitted to the rear end portion of the projection lens (projection optical system) 30 so as to sandwich the rear end portion of the lens barrel portion 39 from above and below, as shown in FIGS. 3 and 4, for example. It is a fitting portion that is used to fix the case portion 88 to the lens barrel portion 39. That is, in FIG. 3 and the like, an adhesive is filled between the inner surfaces of the protruding members (fitting portions) 88u and 88v and the side surface of the lens barrel portion 39, and the case portion 88 is aligned with the lens barrel portion 39. After that, the adhesive is cured and the case portion 88 is fixed to the lens barrel portion 39. At this time, in addition to the vertical and horizontal directions, it is possible to perform alignment with respect to the rotation axis of three rotations. As a pre-stage of the alignment, in the light guide member 10 of the light guide device 20, the root side is fixed by being fitted into the barrel portion 39. In this state, the case portion 88 accommodating the image display device 80 as described above is aligned with the lens barrel portion 39 assembled with the light guide member 10 or the like, so that the final image alignment is performed. Is possible. In particular, as in the present embodiment, in the case of a pair of left and right configurations, it is necessary to adjust in pixel units so that the image for the right eye side and the image for the left eye side are visually recognized in a state of being exactly overlapped. Alignment becomes very important. On the other hand, in the present embodiment, since the image display device 80 is incorporated in the case portion 88 with high accuracy, the adjustment margin can be minimized, and the device can be adjusted while the position is adjusted. It is possible to avoid an increase in size as much as possible.

  Hereinafter, with reference to FIGS. 9A to 9E, an example of a manufacturing process of the display device unit DU which is also a manufacturing process of the virtual image display device 100 will be described.

  First, as shown in FIG. 9A, in the case portion 88 having a frame structure, on a surface including the first reference surface SF1 serving as a reference for positioning in the z direction or in the vicinity of the first reference surface SF1. Adhesive 88s is applied to the non-stick surface NS which is the surface (adhesive applying step). Here, it is assumed that, for example, a place where a drive circuit or the like is arranged can also be used as a part of the margin surface NS for adhesion. Note that the first reference surface SF1 may be configured such that the end surface of the image display device 80 (silicon substrate SS) directly contacts the first reference surface SF1 without the adhesive 88s. Further, as the adhesive 88s, for example, it is conceivable to use a high heat conductive silicone adhesive or a heat conductive epoxy adhesive. By using the adhesive having high thermal conductivity, it is possible to enhance the heat dissipation even on the image light emission side.

  Next, as shown in FIG. 9 (B), the image display device 80 is dropped onto the surface of the first reference surface SF1 to spread the adhesive 88s while positioning on the first reference surface SF1, that is, the first reference surface SF1. The end surface SS1 of the image display device 80 (silicon substrate SS) is brought into contact with the reference surface SF1 and positioning in the z direction (corresponding to FIG. 8A) is performed (first positioning step). At this time, in the x direction, there is originally almost no margin (for example, a margin within several tens μ which is an error degree in dicing of silicon), and the positioning with respect to the second reference plane SF2, that is, the second reference plane SF2. The end surface SS2 of the image display device 80 (silicon substrate SS) comes into contact with the surface SF2, and positioning in the x direction is also performed (second positioning step).

  Next, as shown in FIG. 9C, the image display device 80 is pushed in the −y direction (direction of arrow Y1) by the rod-shaped jig JG, so that the image display device 80 (silicon) is formed on the third reference plane SF3. The end surface SS3 of the substrate SS) is brought into contact (abutting), and positioning in the y direction (corresponding to FIG. 8B) is performed (third positioning step). By the above first to third positioning steps, the first to third reference surfaces SF1 to SF3 are fixed by the adhesive 88s while keeping the slope SSr of the image display device 80 open, and thus the image display device 80 is fixed. It functions as a display device positioning portion (video element positioning portion) 88b that determines the storage position in the case portion 88. It should be noted that, during adjustment by the jig JG shown in FIGS. 9B to 9C, that is, sliding movement, a rectangular display area EA indicated by a broken line in the drawing (that is, an area in which an organic EL element or the like is formed and image light is emitted). It is possible to prevent the adhesive 88s from adhering to).

  After the first to third positioning steps, as shown in FIG. 9D, the hook jig FG capable of being sandwiched in the x direction is used to prevent the positional relationship between the image display device 80 and the case portion 88 from moving. Fix and cure the adhesive 88s. Finally, after the adhesive 88s is cured, by removing the hook jig FG, as shown in FIG. 9 (E), the display unit DU unitized by housing the image display 80 in the case 88 is formed. It is made. The cured adhesive 88s serves as an adhesive portion BP that fixes the image display device 80 and the case portion 88 together.

  As described above, in the virtual image display device 100 including the display device unit DU according to the present embodiment, the image display device 80, which is a video element, is a self-luminous element including the light emitting portion 80k that generates video light, and is separately provided. Since the light source is not required, the weight and size of the virtual image display device 100 can be reduced and the size and weight of the entire virtual image display device 100 can be reduced. Further, since the case portion 88 of the display device unit DU has the heat dissipation structure portion 88a that releases a part of the image display device 80 to dissipate the heat, the internal temperature rise of the image display device 80 is suppressed, and the image display device 80 operates. Even if it is a self-luminous type and particularly includes an organic EL (OLED) element, it is possible to avoid deterioration of performance and shortening of life due to an increase in internal temperature, and it is possible to form a good image. Moreover, in the manufacture of the display device unit DU, it is possible to perform simple and reliable assembly while ensuring high heat dissipation. At this time, particularly by utilizing the characteristics of the silicon substrate SS, highly accurate alignment can be performed.

  Hereinafter, with reference to FIG. 10A and the like, a virtual image display device of a modified example of the present embodiment will be described. In the above embodiment, the first to third reference surfaces SF1 to SF3 forming the display device positioning portion (video element positioning portion) 88b are all planar, but, for example, some of them may be projecting. Good. For example, in the example shown in FIG. 10A, the third reference protrusions TP3 and TP3 are provided at the locations instead of the plane serving as the reference for positioning in the y direction. In the illustrated example, the third reference surface SF3 is set at two positions on both ends of the surface corresponding to the plane. In this case, the positioning error in the y direction caused by pushing in the direction of the arrow Y1 with a jig or the like can be made zero or close to zero by the third reference protrusions TP3 and TP3.

  Further, for example, as shown in FIG. 10B, the projection shape may be used for the positioning in the x direction. That is, instead of the plane that serves as a reference for positioning in the x direction, the second reference protrusions TP2 and TP2 are provided at the locations. In the illustrated example, the second reference surface SF2 is set at two positions on both ends of the surface (one surface) corresponding to the flat surface. In this case, the positioning error in the x direction and the y direction caused by pushing in the direction of the arrow X1 and the direction of the arrow Y1 or the direction including the components in both directions by a jig or the like is determined. The third reference protrusions TP3 and TP3 can be set to zero or approach zero.

[Other]
Although the present invention has been described with reference to the above embodiments, the present invention is not limited to the above embodiments, and can be implemented in various modes without departing from the scope of the invention.

  For example, in the above example, the entire back surface SSr of the silicon substrate SS is assumed to be exposed by the opening OP, but the exposure of the back surface is not always the entire back surface SSr as long as heat radiation or the like is sufficient. Does not need to be exposed, and may be partially covered by another member. For example, as conceptually shown in FIG. 11A and FIG. 11B corresponding to the cross section taken along the line AA of FIG. 11A, the case portion 88 contacts a part of the back surface SSr of the silicon substrate SS. It is also possible to adopt a structure in which a pair of contact portions CP are provided and the silicon substrate SS is supported and fixed by the contact portions CP.

  Further, in the above description, regarding the configuration of the heat dissipation portion DP, as an example, a sheet-like member is directly attached to the back surface side, but the invention is not limited to this, and various types such as a cooling fan or fin structure, a Peltier element, etc. may be provided. It is conceivable to apply the structure or means described above as the heat dissipation part DP.

  Further, in the above description, the element substrate of the image display device 80 is a silicon substrate, but other members such as quartz glass can be used if necessary heat dissipation and positional accuracy are secured.

  Further, in the above description, the case portion 88 is made of a metal having a high thermal conductivity such as aluminum or magnesium, but other materials (for example, resin) may be used as long as the heat radiation and the storage position accuracy of the image display device 80 are secured. Material) may be applied.

  Further, in the above description, various types of image display devices 80 can be used, for example, a configuration using a reflective liquid crystal display device is also possible, and instead of a video display element such as a liquid crystal display device. A digital micromirror device or the like can also be used.

  In the above description, the half mirror layer on the second surface S12 is, for example, a metal reflection film or a dielectric multilayer film, but it can be replaced with a flat or curved hologram element. Further, the fifth surface S15 can also be configured by a hologram element in addition to the case where it is a mirror reflecting surface.

  In the above description, the light guide member 10 and the like extend in the horizontal direction in which the eyes are lined up, but the light guide member 10 may be arranged so as to extend in the vertical direction. In this case, the light guide member 10 has a structure in which the light guide members 10 are arranged in parallel in parallel instead of in series.

  In the above description, only the aspect in which the image light and the external light are superimposed is described, but for example, the aspect in which only the image light is allowed without superimposing and the aspect in which only the external light is observed can be switched and observed. You may apply in a virtual image display apparatus.

  Further, the technique of the present invention may be applied to a so-called video see-through product including a display and an imaging device.

  Further, the technique of the present invention, that is, the casing (image element unit structure) having a structure for heat dissipation in unitizing an image display device (image element) is used in a display device such as a camera finder or a small projector. It is also possible.

  In the case of other applications as described above, for example, when the display device unit (video element unit) does not require high-precision alignment with other optical components, a mounting portion for the alignment is required. (Typically, protrusion members (fitting portions) such as 88u and 88v) may be omitted.

  DESCRIPTION OF SYMBOLS 10 ... Light guide member, 11 ... Light guide part, 12 ... Light guide part, 20 ... Light guide device, 30 ... Projection lens, 39 ... Lens barrel part, 50 ... Light transmissive member, 80 ... Image display device (video element) , 80a ... Main body part, 80f ... FPC part, 80k ... Light emitting part, 88 ... Case part, 88a ... Heat dissipation structure part, 88b ... Display device positioning part (video element positioning part), 88m ... Mask part, 88s ... Adhesive, 88u, 88v ... Protrusion member (mounting part), 100 ... Virtual image display device, 100A ... Display device, 100B ... Display device, 101a ... Optical member, 101a, 101b ... Optical member, 101b ... Optical member, 102 ... Frame part, 102a ... central part, 102b ... support, 102c, 102d ... peripheral part, 102p ... body part, 104 ... temple, 105a, 105b ... image forming body part, 105d ... exterior member, S11-S15 ... surface, S51-S53 ... transparent Surface, SF1-SF3 ... Reference surface, SS ... Silicon substrate, SS1-SS3 ... Each end surface, SSr ... Back surface (exposed portion), TP2, TP2 ... Reference protrusion, TP3, TP3 ... Reference protrusion, X1 ... Arrow, Y1 ... Arrows, AX ... Optical axis, BP ... Adhesive part, DP ... Heat dissipation part, DU ... Display unit, EA ... Display area, FG ... Hook jig, GG ... Protective glass, GL ... Image light, JG ... Jig, NS ... Glue surface, OP ... Opening

Claims (8)

A video element including a light emitting unit for generating video light;
A case portion for accommodating the image element,
The case portion has a heat dissipation structure portion that radiates heat by opening the side of the image element opposite to the side from which image light is emitted, and an image element positioning portion that defines a storage position of the image element. A virtual image display device in which the video element positioning portion is U-shaped so that the video element can slide and come into contact with the video element positioning portion during positioning.   The virtual image display device according to claim 1, wherein the video element positioning portion has a planar shape or a protrusion shape. The video device includes an organic EL device forming the light emitting unit formed on a silicon substrate,
In the case portion, the heat dissipation structure is dissipated by opening the rear surface of the silicon substrate, the virtual image display device according to claim 1 or 2. The case unit is made of metal, the virtual image display device according to any one of claims 1-3. The case unit includes a mask portion for covering a portion of the surface of the exit side of the image light of the image element, and a mounting portion for performing attaching alignment with other optical components, according to claim 1-4 The virtual image display device according to any one of claims. Is formed by high heat conductive silicone adhesive or a thermally conductive epoxy adhesive has an adhesive portion for fixing the said image element and the case section, the virtual image display device according to any one of claims 1 to 5 .. A light guide member for guiding the image light from the image element by total reflection on a plurality of surfaces,
It said to be incident on the light guide member to image light from the image sensor further comprising a projection optical system, the virtual image display device according to any one of claims 1-6. A video device including a light emitting unit for generating video light and a case unit for housing the video device are provided, and the case unit radiates heat by opening the side of the video device opposite to the side from which the video light is emitted. Virtual image display provided with a video element unit having a heat dissipation structure section and a video element positioning section arranged in a U-shape that abuts on a location other than the location where the video element is opened to define the storage position of the video element A method of manufacturing a device , comprising:
Applying an adhesive for fixing the image element in the image element positioning portion of the case portion,
While a state of said opens the image elements in the heat dissipation structure, the image element is slid in the reference surface of the case portion aligned by abutting on the image sensor positioning unit, secured by the adhesive A method of manufacturing a virtual image display device including a video element unit.

Images