Video display device

Abstract

To realize a video display device having a smaller size while reducing deviation in display magnification without causing deviation in the optical axis of an imaging portion.SOLUTION: A video display device 10 includes a control board 200 having various electronic circuits for controlling imaging cameras 20L, 20R, alignment cameras 30L, 30R, and display units 100L, 100R. The imaging cameras 20L, 20R are aligned with openings 210L, 210R provided in the control board 200 and exposed from the openings 210L, 210R. The imaging cameras 20L, 20R are independent and not constrained from each other in relation to the control board 200, and in this case, are spaced apart from the edges of the openings 210L, 210R of the control board 200 and are in a non-contact state.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to an image display device. [Background technology]

[0002] In recent years, image display devices that are worn on the head of an observer and display images in front of the observer's eyes have come into use. Image display devices are used as devices that enable the experience of artificial reality (virtual reality: VR) and mixed reality (mixed reality: MR) because they allow easy viewing of images on a large screen and facilitate stereoscopic viewing.

[0003] An image display device that realizes MR has an imaging unit for capturing images of a subject corresponding to the left and right eyes of an observer, a display unit for superimposing and displaying a 3DCG image created by a PC or the like on the image captured by the imaging unit, and an observation optical system for projecting the image onto the observer. This type of image display device is called a video see-through type image display device.

[0004] The image projected to the observer is first displayed on a display element such as a small liquid crystal panel corresponding to the observer's left and right eyes, and this image is then enlarged through an observation optical system corresponding to each of the observer's left and right eyes, and then projected onto the observer's left and right eyes. The captured image of the subject is an image having parallax corresponding to the left and right eyes. Furthermore, a three-dimensional CG image (3DCG image) is created as a parallax image corresponding to the observer's left and right eyes, and is superimposed on the image captured by the imaging unit and displayed on the display unit via the observation optical system. This makes it possible to express a virtual 3DCG image as if it actually exists.

[0005] The image display device is provided with a control board for controlling the imaging unit and the display unit. However, if the control board is arranged above or below the imaging unit or the display unit, the image display device becomes large. In order to reduce the size of the video see-through image display device, it is possible to arrange the control board so that it is aligned with the imaging unit and the display unit in the thickness direction of the device. However, when the control board is arranged between the imaging unit and the display unit, a space is required between the imaging unit and the display unit for the control board to fit in. If the imaging unit and the display unit are separated from each other by this, a difference in magnification between the reality and the image captured by the imaging unit occurs, and there is a risk that the displayed image will look strange. For example, Patent Document 1 discloses an imaging device in which an opening is provided in the control board, the imaging unit is fixed to the control board so as to cover the opening, and the imaging unit and the control board are electrically connected. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2005-323396 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, when using the conventional technology disclosed in Patent Document 1, the imaging optical axis of the imaging unit is affected by the inclination of the control board. Therefore, when multiple imaging units are fixed on one control board as in the above-mentioned image display device, there is a problem that optical axis misalignment occurs between the left and right imaging units.

[0008] The present invention has been made in consideration of the above-mentioned problems, and aims to provide an image display device that can reduce the difference in display magnification and achieve miniaturization of the device without causing optical axis misalignment between the left and right imaging sections. [Means for solving the problem]

[0009] The image display device of the present invention comprises a first imaging unit and a second imaging unit corresponding to a user's left eye and right eye, respectively, which acquire images, a first display unit and a second display unit which display images captured by the first imaging unit and the second imaging unit, and a control board which controls the first imaging unit and the second imaging unit, the control board being provided with an exposed area, and the first imaging unit and the second imaging unit being in an unconstrained and independent state with respect to the control board, and at least a portion of them being exposed from the exposed area. Effect of the Invention

[0010] According to the present invention, it is possible to reduce the deviation in display magnification and to realize a compact image display device without causing any deviation in the optical axes of the left and right imaging sections. [Brief description of the drawings]

[0011] [Figure 1] 1 is a perspective view showing a state in which an image display device according to a first embodiment is worn on a head. [Diagram 2] 1 is a perspective view of an image display device according to a first embodiment, as viewed from the rear side. [Diagram 3] 2 is a cross-sectional view taken along dashed line AA in FIG. [Figure 4] 1 is a front perspective view showing an image display device in a state where a chassis is incorporated into a joint. [Diagram 5] FIG. 2 is a front perspective view showing a display unit. [Figure 6] 13 is a front perspective view showing a state in which a rear cover and a display unit are assembled with the chassis assembled into a joint. FIG. [Figure 7] 2 is a front perspective view showing a control board provided in the image display device according to the first embodiment. FIG. [Figure 8] FIG. 1 is a schematic diagram showing a video display device including a control board. [Figure 9] 4 is a schematic diagram showing the relationship between the optical axis of the imaging camera and the position of the display unit. FIG. [Figure 10]11 is a front perspective view showing a control board provided in an image display device according to a first modified example of the first embodiment. FIG. [Figure 11] 11 is a front perspective view showing a control board provided in an image display device according to a second modified example of the first embodiment. FIG. [Figure 12] 13 is a front perspective view showing a control board provided in an image display device according to a third modified example of the first embodiment. FIG. [Figure 13] FIG. 11 is a front perspective view showing a control board provided in an image display device according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the following description, components common to multiple drawings are given common reference numerals. Therefore, the common components will be described with mutual reference to multiple drawings, and the description of the components given the common reference numerals will be omitted as appropriate.

[0013] -First embodiment- In this embodiment, a video see-through type image display device 10 (hereinafter simply referred to as image display device 10) is exemplified as the image display device.

[0014] FIG. 1 is a perspective view showing an image display device according to this embodiment worn on the head. A user can observe an image by wearing the image display device 10 on the head. The image display device 10 has a front cover 12 on the front and a rear cover 13 on the rear, and is provided with imaging cameras 20L and 20R, which are a first imaging unit for the left eye and a second imaging unit for the right eye, on the front side, and alignment cameras 30L and 30R. The imaging cameras 20L and 20R are stereo cameras that acquire real images of the surroundings. The alignment cameras 30L and 30R are stereo cameras that acquire the position and orientation of the image display device 10 by using feature points such as markers and edges of objects from the acquired images.

[0015] In this embodiment, the imaging cameras 20L, 20R and the alignment cameras 30L, 30R are provided separately. The alignment cameras 30L, 30R are monochrome images, but are oriented toward high-precision and high-fault-tolerance alignment by utilizing a wide angle of view, a high shutter speed, a long baseline length, and the like. It is also possible to perform both display image acquisition and alignment information acquisition only with the imaging cameras 20L, 20R without using the alignment cameras 30L, 30R. In addition, instead of the alignment cameras 30L, 30R, distance sensors using ultrasonic waves, infrared rays, and the like may be substituted. The image display device 10 is connected to a head mounting device 40, and the image display device 10 can be rotated around a rotation axis 41 formed on the head mounting device 40. When observing, the display can be placed directly facing the face as shown in FIG. 1, and when not observing, it can be flipped up.

[0016] FIG. 2 is a perspective view of the image display device according to this embodiment, as viewed from the rear side. The image display device 10 is provided with a display unit 100L for the left eye and a display unit 100R for the right eye on the rear side as a first display unit for the left eye and a second display unit for the right eye, and an observer observes an image by looking through the display units 100L, 100R. Hoods 11L, 11R are provided around the display units 100L, 100R, and the left and right positions of the display units 100L, 100R can be adjusted to match the interpupillary distance of the observer.

[0017] FIG. 3 is a cross-sectional view taken along dashed line AA in FIG. The configuration of the left and right display units 100L, 100R will be described using Fig. 3. In the figure, parts that are not necessary for the description are omitted. Since the display unit 100L for the left eye and the display unit 100R for the right eye have the same configuration, the reference numerals for the right eye are omitted, and the following description will be given using the left eye as an example.

[0018] The display unit 100L enlarges and projects the original image displayed on the display element 120L as a virtual image, and guides it to the user's eye 110L. The display unit 100L has an optical system that folds the optical path by using polarized light, and the optical path will be described below.

[0019] First, as shown in FIG. 3, a polarizing plate 130L and a first phase plate 140L are arranged between the display element 120L and the lens 150L in order from the display element 120L side, and a half mirror 160L is formed on the lens 151L side surface of the lens 150L by deposition. The deposition surface of this half mirror 160L acts as a semi-transmissive reflecting surface. In this embodiment, the polarizing plate 130L and the first phase plate 140L are integrated and fixed to the lens barrel 200L. Next, a second phase plate 141L and a PBS 170L of a polarization separation element are arranged between the lens 151L and the user's eye 110L in order from the display element 120L side. The second phase plate 141L and the PBS 170L are planar. The first phase plate 140L and the second phase plate 141L are wave plates with a phase difference of λ / 4. The second phase plate 141L is held in contact with the lens 151L. In this embodiment, the second phase plate 141L and the PBS 170L are integrated and attached onto the lens 150L. The lenses 150L and 151L are joined together to form a lens unit 180L together with the second phase plate 141L and the PBS 170L. The lens unit 180L is fixed to the lens barrel 200L.

[0020] At this time, the polarization direction of light transmitted through the polarizing plate 130L is inclined at 45° to the slow axis of the first phase plate 140L, and the polarization direction of light transmitted through the PBS 170L is inclined at 45° to the slow axis of the second phase plate 141L. In addition, the polarization direction of light transmitted through the polarizing plate 130L is perpendicular to the polarization direction of light transmitted through the PBS 170L.

[0021] In this configuration, the light emitted from the display element 120L passes through the polarizing plate 130L to become linearly polarized light, and passes through the first phase plate 140L to become circularly polarized light. The light passes through the half mirror 160L and the second phase plate 141L to become linearly polarized light (first linearly polarized light). Since the polarization direction of this linearly polarized light is perpendicular to the polarization direction transmitted by the PBS 170L, the light is reflected by the PBS 170L and passes through the second phase plate 141L to become circularly polarized light. The light is reflected by the half mirror 160L and passes through the second phase plate 141L to become linearly polarized light (second linearly polarized light). However, the polarization direction of this linearly polarized light is different from the previous case and coincides with the polarization direction transmitted by the PBS 170L, so the light passes through the PBS 170L and is guided to the user's eye 110L. The user's eye 110L is approximately aligned with the exit pupil of the display unit 100L. By using polarized light to fold the optical path in this way, it is possible to make the optical system thin and with a short focal length, enabling image observation with a wide angle of view.

[0022] The configuration of the image display device 10 will be described below with reference to Figs. 4 to 6. Fig. 4 is a front perspective view showing the image display device in a state where the chassis is incorporated into the joint. Fig. 5 is a front perspective view showing the display unit. Fig. 6 is a front perspective view showing the state where the rear cover and the display unit are incorporated into the state where the chassis is incorporated into the joint.

[0023] As shown in FIG. 4, the imaging cameras 20L, 20R and the alignment cameras 30L, 30R are adhesively fixed to the chassis 50. At this time, the inclination and rotation direction of the imaging cameras 20L, 20R and the alignment cameras 30L, 30R are adjusted so that the optical axes of the imaging cameras 20L, 20R and the alignment cameras 30L, 30R are aligned, and then the cameras are fixed. The chassis 50 is made of metal material, not resin, in order to minimize expansion and contraction due to heat. The chassis 50 is a part integrally molded with the resin part, and has arms 51L, 51R, 52L, 52R, 53L, 53R and bosses 54L, 54R. The bosses 54L, 54R are fitted into holes 61L, 61R formed in the joint 60, and the chassis 50 is held rotatable (pivotable) with respect to the joint 60 around the bosses 54L, 54R as the rotation center. The joint 60 is fixed to the rear cover 13 with screws 62.

[0024] As shown in FIG. 5, the lens barrels 190L and 190R are provided with grooves 191L, 191R, 192L, 192R, 193L, and 193R. As shown in FIG. 6, arm portions 51L, 51R, 52L, 52R, 53L, 53R provided on the chassis 50 are fitted into grooves 191L, 191R, 192L, 192R, 193L, 193R, and are held so as to be movable in the left-right direction.

[0025] As a result of the above, the chassis 50 and the display units 100L, 100R are fixed to the rear cover 13 via the joints 60. Finally, the front cover 12 is attached, thereby determining the position of the chassis 50 in the front-rear direction.

[0026] FIG. 7 is a front perspective view showing a control board provided in the image display device according to this embodiment. The control board 200 is a board equipped with various electronic circuits for controlling the imaging cameras 20L, 20R, the alignment cameras 30L, 30R, and the display units 100L, 100R. In this embodiment, the control board 200 is formed with openings 210L, 210R which serve as a first exposure area and a second exposure area that expose at least a part of the imaging cameras 20L, 20R (portions of the optical members of the imaging cameras 20L, 20R).

[0027] FIG. 8 is a schematic diagram showing an image display device equipped with a control board, where (a) is a front perspective view of the image display device with its front cover removed, and (b) is a cross-sectional view taken along dashed line BB in (a). The control board 200 is electrically connected to the imaging cameras 20L and 20R, the alignment cameras 30L and 30R, and the wirings 21L, 21R, 31L, 21R, 121L, and 121R from the display elements 120L and 120R. The control board 200 is fixed to the rear cover 13 with, for example, four screws 201. At this time, the imaging cameras 20L and 20R are aligned with the openings 210L and 210R provided in the control board 200, and the imaging cameras 20L and 20R are exposed from the openings 210L and 210R. In this embodiment, the imaging cameras 20L and 20R are in an independent state not constrained from each other in relation to the control board 200, and in this case, are in a non-contact state spaced apart from the edges of the openings 210L and 210R of the control board 200.

[0028] 8(b), the control board 200 is located in front of the chassis 50, which is a holding member that holds the imaging cameras 20L, 20R and the alignment cameras 30L, 30R. The imaging cameras 20L, 20R partially overlap with the control board 200 in a side view, and the control board 200 is located behind the tips of the imaging cameras 20L, 20R.

[0029] In this embodiment, in the image display device 10, the control board 200 in which the openings 210L, 210R for exposing at least a part of the imaging cameras 20L, 20R are formed is disposed at the above-mentioned position in relation to the chassis 50 and the imaging cameras 20L, 20R. With this configuration, the thickness of the device is not increased by disposing the control board 200, and the device can be made smaller. In addition, no space is required between the imaging cameras 20L, 20R and the display units 100L, 100R for the control board 200 to be inserted. Therefore, it is possible to prevent an increase in the positional deviation between the imaging cameras 20L, 20R and the display units 100L, 100R, and to reduce the difference between the actual display magnification.

[0030] In the present embodiment, in the image display device 10, the imaging cameras 20L, 20R are exposed from the openings 210L, 210R of the control board 200, but are spaced from and in a non-contact state with the edges of the openings 210L, 210R in the control board 200. With this configuration, the optical axes of the imaging cameras 20L, 20R are not affected by the inclination of the control board 200. Therefore, by making the optical axis direction of the imaging camera 20L coincide with the optical axis direction of the imaging camera 20R, it is possible to prevent the optical axis misalignment between the imaging cameras 20L and 20R due to the relationship with the control board 200.

[0031] FIG. 9 is a schematic diagram showing the relationship between the optical axis of the imaging camera and the position of the display unit. The display units 100L and 100R are adjustable in left and right position according to the distance between the user's eyes, and an adjustable range L1 is shown in FIG. 9. The imaging cameras 20L and 20R are spaced from the edges of the openings 210L and 210R in the control board 200 and are in a non-contact state, so that the optical axes of the imaging cameras 20L and 20R are not affected by the inclination of the control board 200. Therefore, as shown in FIG. 9, the vertical positions of the optical axis centers of the imaging cameras 20L and 20R can be matched with the vertical display centers of the display units 100L and 100R for each of the imaging cameras 20L and 20R, and the horizontal positions of the optical axis centers can be kept within the adjustable range L1 of the display units 100L and 100R. As described above, in the present embodiment, in the image display device 10, it is possible to minimize the optical axis misalignment of the imaging camera 20L with the display center of the display unit 100L and the optical axis misalignment of the imaging camera 20R with the display center of the display unit 100R.

[0032] In the present embodiment, the imaging cameras 20L, 20R partially overlap with the control board 200 in a side view of the image display device 10. In this case, if the imaging cameras 210L, 210R are particularly thin, it may be difficult to overlap the imaging cameras 210L, 210R with the control board 200 in a side view. In such a case, they do not necessarily need to overlap. For example, the control board 200 may be disposed in front of the imaging cameras 20L, 20R, and the imaging cameras 20L, 20R may be seen through the openings 210L, 210R provided in the control board 200, so that the desired image can be obtained without the imaging image being cut off by the control board 200.

[0033] Even in this case, there is no optical axis misalignment in the imaging cameras 20L, 20R due to the relationship with the control board 200. The control board 200 does not increase the thickness of the device, and the device can be made smaller. In addition, it is possible to prevent an increase in positional misalignment between the imaging cameras 20L, 20R and the display units 100L, 100R, and it is possible to reduce the difference between the display magnification and reality.

[0034] In the present embodiment, the left and right positions of the display units 100L and 100R are adjustable to match the interpupillary distance of the user, but this is not necessarily required. In this case, the optical axis center of the imaging camera 20L is aligned with the display center of the display unit 100L, and the optical axis center of the imaging camera 20R is aligned with the display center of the display unit 100R, thereby making it possible to obtain an image without optical axis misalignment.

[0035] -Modification of the first embodiment- Here, various modifications of this embodiment will be described.

[0036] [Variation 1] FIG. 10 is a front perspective view showing a control board provided in an image display device according to the first modification of the first embodiment. The control board 300 is a board equipped with various circuits for controlling the imaging cameras 20L, 20R, the alignment cameras 30L, 30R, and the display units 100L, 100R, similar to the control board 200 shown in the first embodiment. In the first modification, the control board 300 is provided with cutouts 310L, 310R, which serve as first and second exposure areas exposing at least a part of the imaging cameras 20L, 20R, instead of the openings 210L, 210R of the control board 200. The first and second exposure areas do not necessarily need to be openings surrounded by the edges of the four sides as in the present embodiment, and may be cutouts 310L, 310R with the edges of three sides remaining, with the lower part missing, as shown in FIG.

[0037] Wires 21L, 21R, 31L, 21R, 121L, 121R from the imaging cameras 20L, 20R, alignment cameras 30L, 30R, and display elements 120L, 120R are electrically connected to the control board 300. The control board 300 is fixed to the rear cover 13 with, for example, four screws 201. At this time, the imaging cameras 20L, 20R are in an independent state not constrained from each other via the control board 300, here in a non-contact state separated from the control board 300, and the imaging cameras 20L, 20R are visible through notches 310L, 310R provided in the control board 300.

[0038] According to the first modification, it is possible to prevent the occurrence of optical axis misalignment between the imaging cameras 20L and 20R due to the relationship with the control board 300. The device can be made smaller without increasing the thickness of the device due to the control board 300. In addition, it is possible to prevent an increase in positional misalignment between the imaging cameras 20L, 20R and the display units 100L, 100R, and it is possible to reduce the difference between the display magnification and reality.

[0039] [Variation 2] FIG. 11 is a front perspective view showing a control board included in an image display device according to the second modification of the first embodiment. The control board 400 is a board equipped with various circuits for controlling the imaging cameras 20L, 20R, the alignment cameras 30L, 30R, and the display units 100L, 100R, similar to the control board 200 shown in the first embodiment. In the second modification, the control board 400 is provided with cutouts 410L, 410R, which serve as first and second exposure areas exposing at least a part of the imaging cameras 20L, 20R, instead of the openings 210L, 210R of the control board 200. The first and second exposure areas do not necessarily have to be openings surrounded by the edges of the four sides as in the present embodiment, and may be cutouts 410L, 410R with the edges of two sides remaining, for example, with the lower side and one side missing, as shown in FIG.

[0040] Wires 21L, 21R, 31L, 21R, 121L, 121R from the imaging cameras 20L, 20R, alignment cameras 30L, 30R, and display elements 120L, 120R are electrically connected to the control board 400. The control board 400 is fixed to the rear cover 13 with, for example, four screws 201. At this time, the imaging cameras 20L, 20R are in an independent state not constrained from each other via the control board 400, here in a non-contact state separated from the control board 400, and the imaging cameras 20L, 20R are visible through notches 410L, 410R provided in the control board 400.

[0041] According to the second modification, it is possible to prevent the occurrence of optical axis misalignment between the imaging cameras 20L and 20R due to the relationship with the control board 400. The control board 400 does not increase the thickness of the device, and the device can be made more compact. In addition, it is possible to prevent an increase in positional misalignment between the imaging cameras 20L, 20R and the display units 100L, 100R, and it is possible to reduce the difference between the display magnification and reality.

[0042] [Variation 3] FIG. 12 is a front perspective view showing a control board included in an image display device according to a third modification of the first embodiment. The control board 500 is a board equipped with various circuits for controlling the imaging cameras 20L, 20R, the alignment cameras 30L, 30R, and the display units 100L, 100R, similar to the control board 200 shown in the first embodiment. In the third modification, the control board 500 is formed with a cutout 510 that serves as an integral exposure area exposing at least a part of the imaging cameras 20L, 20R (the optical members of the imaging cameras 20L, 20R) instead of the openings 210L, 210R of the control board 200. The exposure area of ​​the control board 500 does not necessarily have to be two opening shapes surrounded by the edges of the four sides as in the present embodiment, and may be, for example, a single cutout 510 with the edges of three sides remaining with the lower part missing as shown in FIG. 12.

[0043] Wires 21L, 21R, 31L, 21R, 121L, 121R from the imaging cameras 20L, 20R, alignment cameras 30L, 30R, and display elements 120L, 120R are electrically connected to the control board 500. The control board 500 is fixed to the rear cover 13 with, for example, four screws 201. At this time, the imaging cameras 20L, 20R are in an independent state not constrained from each other via the control board 300, in this case, in a non-contact state separated from the control board 500, and the imaging cameras 20L, 20R are visible through a notch 510 provided in the control board 500.

[0044] According to the third modification, it is possible to prevent the occurrence of optical axis misalignment between the imaging cameras 20L and 20R due to the relationship with the control board 500. The device can be made smaller without increasing the thickness of the device due to the control board 500. In addition, it is possible to prevent an increase in positional misalignment between the imaging cameras 20L, 20R and the display units 100L, 100R, and it is possible to reduce the difference between the display magnification and reality.

[0045] The present invention is not limited to this embodiment or the above-mentioned modified examples 1 to 3, and the shape of the openings or cutouts provided in the control board is not limited, and the present invention is applicable as long as an area is formed in the board through which the imaging cameras 20L, 20R can be viewed.

[0046] -Second embodiment- In this embodiment, a video see-through type image display device is disclosed similarly to the first embodiment, but it differs from the first embodiment in that the installation state of the imaging camera and the control board are different. In this embodiment, the description of the same parts as in the first embodiment will be omitted, and the same reference numerals as in the first embodiment will be used.

[0047] FIG. 13 is a front perspective view showing a control board provided in the image display device according to this embodiment. In this embodiment, the control board is divided into two parts, a control board 600L which is a first control board and a control board 600R which is a second control board. An opening 610L is formed in the control board 600L, and an opening 610R is formed in the control board 600R. A left-eye imaging camera 620L is mounted and fixed on the control board 600L so that a front portion thereof is exposed from the opening 610L. A right-eye imaging camera 620R is mounted and fixed on the control board 600R so that a front portion thereof is exposed from the opening 610R. The control boards 600L and 600R are electrically connected to each other by a wiring board (not shown).

[0048] In this embodiment, the imaging cameras 620L and 620R are fixed to the control boards 600L and 600R, but the control boards 600L and 600R are separated from each other. Therefore, the imaging cameras 620L and 620R are in an independent state, not constrained from each other, in relation to the control boards 600L and 600R. In other words, the imaging camera 620L fixed to the control board 600L and the imaging camera 620R fixed to the control board 600R are in an independent state from each other. Therefore, the imaging camera 620L is not influenced by the control board 600R, and the imaging camera 620R is not influenced by the control board 600L. Therefore, by making the optical axis direction of the imaging camera 620L and the optical axis direction of the imaging camera 620R coincide with each other, it is possible to prevent the optical axis misalignment between the imaging cameras 620L and 620R caused by the relationship with the control boards 600L and 600R.

[0049] In this embodiment, since the imaging cameras 620L, 620R are independent of each other as described above, the optical axis centers of the imaging cameras 620L, 620R are adjusted to coincide with the display centers of the display units 100L, 100R. Here, with regard to the left-right direction, the left-right positions of the optical axis centers may be adjusted to fall within the adjustable ranges of the display units 100L, 100R.

[0050] If the control boards 600L, 600R are fixed to the rear cover 13 without aligning the optical axes, the optical axis directions of the imaging cameras 620L, 620R will not match due to the influence of misalignment of the imaging cameras 620L, 620R and warping of the rear cover 13. To prevent this, the inclination and rotation direction of the control boards 600L, 600R are adjusted and then fixed to the rear cover 13 so that the optical axis directions of the imaging cameras 620L, 620R match as described above. As a result, the optical axis directions of the imaging cameras 620L, 620R can be kept aligned. In this embodiment, the control board is divided into two boards 600L, 600R, so that the optical axis directions of the left and right imaging cameras 620L, 620R can be aligned.

[0051] According to this embodiment, there is no optical axis misalignment in the imaging cameras 620L, 620R due to the relationship with the control boards 600L, 600R. The thickness of the device is not increased by the control boards 600L, 600R, and the device can be made smaller. In addition, it is possible to prevent an increase in positional misalignment between the imaging cameras 620L, 620R and the display units 100L, 100R, and it is possible to reduce the difference between the display magnification and reality.

[0052] In this embodiment, the imaging cameras 620L, 620R are fixed to the control boards 600L, 600R at their front ends, so the rear ends of the imaging cameras 620L, 620R may be left unfixed. In this case, the chassis 50 for holding and fixing the imaging cameras may not be provided. The alignment cameras 30L, 30R are fixed to other members, for example, the rear cover 13. By omitting the chassis 50, it is possible to reduce the distance between the boards 600L, 600R and the display units 100L, 100R. This makes it possible to further miniaturize the device and prevent an increase in the positional deviation between the imaging cameras 620L, 620R and the display units 100L, 100R, and to reduce the difference between the display magnification and reality.

[0053] In this embodiment, the left and right control boards 600L, 600R are divided into approximately equal sizes at approximately the center, but this is not limited to this, and the sizes may be different. For example, one of the control boards 600L, 600R may be made as large as possible to concentrate the amount of electronic circuits that perform the main functions on that control board, and the other control board may be limited to the minimum amount of electronic circuits required for controlling the imaging camera. By configuring the control boards 600L, 600R in this way, the wiring connected to the control board can be concentrated around the larger control board, shortening the wiring distance, which in turn contributes to the miniaturization of the device.

[0054] The disclosure of this embodiment includes the following configuration. (Configuration 1) a first imaging unit and a second imaging unit corresponding to a left eye and a right eye of a user, respectively, for acquiring images; a first display unit and a second display unit that display images captured by the first imaging unit and the second imaging unit; A control board that controls the first imaging unit and the second imaging unit; Equipped with The control board has an exposed area, The first imaging unit and the second imaging unit are in an independent state not constrained from each other in relation to the control board, and at least a part of the first imaging unit and the second imaging unit are exposed from the exposure area. 13. A video display device comprising: (Configuration 2) The exposed area is a first exposure area that exposes at least a portion of the first imaging unit; a second exposure area that exposes at least a portion of the second imaging unit; It has 2. The image display device according to claim 1. (Configuration 3) The exposed area is an integrated area that exposes at least a part of both the first imaging unit and the second imaging unit. 2. The image display device according to claim 1. (Configuration 4) The exposed area is an opening formed in the control board. The image display device according to any one of configurations 1 to 3. (Configuration 5) The exposed area is a notch formed in the control board. The image display device according to any one of configurations 1 to 3. (Configuration 6) The first imaging unit and the second imaging unit are spaced apart from the control board. 6. The image display device according to any one of configurations 1 to 5. (Configuration 7) the control board includes a first control board and a second control board separated from each other; the first imaging unit is fixed to the first control board so that at least a portion of the first imaging unit is exposed from the exposure area; the second imaging unit is fixed to the second control board so that at least a portion of the second imaging unit is exposed from the exposure area; 6. The image display device according to any one of configurations 1 to 5. (Configuration 8) The first imaging unit and the second imaging unit have rear end sides in an unfixed state. 8. The image display device according to configuration 7. (Configuration 9) the first control board and the second control board are different in size, and the larger one has a larger amount of electronic circuits mounted thereon than the other smaller one; 8. The image display device according to configuration 7. (Configuration 10) When viewed from the side, the first imaging unit and the second imaging unit are at least partially overlapped with the control board. 10. The image display device according to any one of configurations 1 to 9. (Configuration 11) The optical axis center of the first imaging unit and the display center of the first display unit are substantially aligned, The optical axis center of the second imaging unit and the display center of the second display unit are substantially aligned. The image display device according to any one of configurations 1 to 10. (Configuration 12) The first display unit and the second display unit are capable of adjusting their left and right positions in accordance with the distance between the user's eyes, The optical axis centers of the first imaging unit and the second imaging unit are within an adjustable range of the left and right positions of the first display unit and the second display unit. 12. The image display device according to any one of configurations 1 to 11. (Configuration 13) A holding member that holds the first imaging unit and the second imaging unit, The control board is located forward of the holding member and rearward of the tips of the first imaging unit and the second imaging unit. The image display device according to any one of configurations 1 to 7. [Explanation of symbols]

[0055] 10: Video see-through type image display device 20L, 20R, 620L, 620R: Imaging camera 30L, 30R: Alignment camera 50: Chassis 100L, 100R: Display unit 200, 300, 400, 500, 600: Control board 210L, 210R, 610L, 610R: Opening 310L, 310R, 410L, 510R, 510: Cutout

Claims

1. a first imaging unit and a second imaging unit corresponding to a left eye and a right eye of a user, respectively, for acquiring images; a first display unit and a second display unit that display images captured by the first imaging unit and the second imaging unit; a control board that controls the first imaging unit and the second imaging unit; Equipped with The control board has an exposed area, the first imaging unit and the second imaging unit are in an unconstrained and independent state with respect to the control board, and at least a portion of the first imaging unit and the second imaging unit are exposed from the exposure area; 13. A video display device comprising:

2. The exposed area is a first exposure area that exposes at least a portion of the first imaging unit; a second exposure area that exposes at least a portion of the second imaging unit; It has 2. The image display device according to claim 1.

3. The exposed area is an integrated area that exposes at least a part of both the first imaging unit and the second imaging unit.

2. The image display device according to claim 1.

4. The exposed area is an opening formed in the control board.

2. The image display device according to claim 1.

5. The exposed area is a notch formed in the control board.

2. The image display device according to claim 1.

6. The first imaging unit and the second imaging unit are spaced apart from the control board.

2. The image display device according to claim 1.

7. the control board includes a first control board and a second control board separated from each other; the first imaging unit is fixed to the first control board so that at least a portion of the first imaging unit is exposed from the exposure area; the second imaging unit is fixed to the second control board so that at least a portion of the second imaging unit is exposed from the exposure area; 2. The image display device according to claim 1.

8. The first imaging unit and the second imaging unit have rear end sides in an unfixed state.

8. The image display device according to claim 7.

9. the first control board and the second control board are different in size, and the larger one has a larger amount of electronic circuits mounted thereon than the other smaller one; 8. The image display device according to claim 7.

10. When viewed from the side, at least a portion of the first imaging unit and the second imaging unit overlaps with the control board.

2. The image display device according to claim 1.

11. an optical axis center of the first imaging unit and a display center of the first display unit substantially coincide with each other; The optical axis center of the second imaging unit and the display center of the second display unit are substantially aligned.

2. The image display device according to claim 1.

12. The first display unit and the second display unit are capable of adjusting their left and right positions in accordance with the distance between the user's eyes, The optical axis centers of the first imaging unit and the second imaging unit are within an adjustable range of the left and right positions of the first display unit and the second display unit.

2. The image display device according to claim 1.

13. a holding member that holds the first imaging unit and the second imaging unit, the control board is located forward of the holding member and rearward of the tips of the first imaging unit and the second imaging unit; 2. The image display device according to claim 1.

Images