JP5072280B2 - Image display device - Google Patents

Description

  The present invention relates to an image display device such as a head-mounted display, and more particularly to an alignment adjustment mechanism around three orthogonal axes of a display unit and an imaging unit in the image display device.

  The head-mounted display that is mounted on the viewer's head and presents the image in front of it is equipped with an imaging unit that presents an external world image acquired by imaging or displays a CG (computer graphics) image in the external image. Some of them present composite images. A head mounted display equipped with an imaging unit is also referred to as a video sheath type head mounted display.

  In the video sheath type head mounted display, in order to present the same image as the observer actually sees with the eyes, it is necessary to optically match the observer's line-of-sight direction with the imaging direction of the imaging unit. That is, in the head-mounted display, the alignment between the display unit (an optical system for enlarging and presenting the image displayed on the display element) to the observer and the imaging unit needs to be in a certain relationship.

  In addition, when the video is presented to the observer's eyes, the alignment of the left and right display units is also important. For example, if the left and right display units are displaced in the vertical direction, the images presented to the left and right eyes will be displaced in the vertical direction, and the image may appear double or the eyes may become tired. Further, when the left and right presentation images are shifted in the left-right direction, the convergence on the observation target in the video is different from the convergence on the actual observation target, and affects the observer's sense of distance. In order to prevent such a shift of the left and right presentation images, it is necessary to adjust the alignment between the left and right display units and the imaging unit with high accuracy in the vertical direction, the horizontal direction, and the rotation direction. .

As an alignment adjustment structure of an optical system, as disclosed in Patent Document 1, a rotation position about an axis to be adjusted (in Patent Document 1, an image sensor such as a CCD sensor) about two axes orthogonal to each other ( Some of them are adjustable. Specifically, the mount base with the image sensor fixed is pressed against a steel ball, and the adjustment screw is pressed against two inclined portions provided on the mount with the steel ball as the center. Make adjustments.
Japanese Patent Laying-Open No. 2005-117253 (paragraphs 0013 to 0019, 0025, FIG. 5, etc.)

  In the conventional structure capable of adjusting the inclination around multiple axes including the alignment adjustment structure disclosed in Patent Document 1, it is necessary to perform an adjustment operation (for example, an adjustment screw) for each axis. . For example, when adjusting the rotation around the three orthogonal axes (x, y, z axes), first, the first adjustment screw is operated to rotate the adjustment object around the x axis, and the vertical tilt is performed. Next, in order to rotate the y-axis, the second adjustment screw is operated to adjust the horizontal inclination. Finally, the third adjustment screw is operated to rotate the adjustment target around the z axis, and the rotational position around the optical axis is adjusted.

  However, in this multi-axis adjustment structure that requires operation for each axis, there is no problem if the adjustment mechanisms for each axis are independent from each other. difficult. In addition, because the influence of deformation of the parts that support the load of the adjustment object differs for each axis, it is difficult to perform high-precision adjustment around all axes.

  Therefore, in the past, for example, if the horizontal tilt is adjusted after adjusting the vertical tilt, the vertical tilt changes due to the effect, so the vertical tilt is adjusted again. There is a problem that it takes time and effort.

  Accordingly, an object of the present invention is to provide an image display device such as a head-mounted display that can collectively adjust the rotation of the display unit and the imaging unit around three orthogonal axes.

The image display apparatus according to one aspect of the present invention includes a first and a second imaging unit including an imaging element, respectively, Table示素Ko simply showing display the image generated by using an output from an imaging element, respectively A first connection mechanism that connects the first and second display units, the first imaging unit, and the first display unit so as to be rotatable about three axes that intersect each other, and three axes of the first connection mechanism A single first member that is operated to fix and release the rotation, and the first and second display units are relatively connected to each other so as to be rotatable about three axes that intersect each other. And a single second member that is operated to perform fixing and releasing of the fixing around the three axes of the second connecting mechanism.

  Note that an image display system including the image display device and an image supply device that supplies an image to the image display device also constitutes another aspect of the present invention.

  According to the present invention, by operating a single lock member, it is possible to perform adjustment around the three orthogonal axes of the unit to be adjusted (imaging unit or display unit), and fixing after adjustment is also possible. Become. Therefore, alignment adjustment around three axes can be performed easily and in a short time.

  Embodiments of the present invention will be described below with reference to the drawings.

    FIG. 1 shows the appearance of a video sheath type head mounted display (image display device) that is Embodiment 1 of the present invention. The head mounted display 1 includes a main body 2 that houses a display unit and an imaging unit, which will be described later, and a mounting mechanism 3 for mounting the head mounted display 1 on the head so as to place the main body 2 in front of the observer's eyes. . 2a is a window formed on the front surface of the main body 2, and the imaging unit captures an external image through the window 2a.

  As shown in FIG. 2, the main body 2 houses a display unit 10, an imaging unit 21, and a connecting unit 15 that connects them. Although FIG. 2 shows only a configuration for one eye, in practice, the display unit 10, the imaging unit 21, and the connection unit 15 are respectively left and right so that an image can be presented to both eyes of the observer. A pair is provided.

  The display unit 10 constitutes a light source (not shown), a display panel (display element) 12 such as a liquid crystal panel, and an observation optical system for presenting an image displayed on the panel 12 to a viewer's eye E as a virtual image. And a prism lens 11. The display unit 10 is held at a predetermined position by the support member 14.

  The imaging unit 21 includes an imaging element 23 such as a CCD sensor or a CMOS sensor, and an imaging optical system 22 for forming an external image on the imaging element 23.

  In FIG. 2, L1 and L2 indicated by alternate long and short dash lines indicate the optical axis of the observation optical system (here, the meaning of the optical path followed by the central principal ray from the center of the display area of the panel 12 to the center of the exit pupil). L2 also indicates the line of sight of the observer's eye E toward the center of the displayed image.

  A one-dot chain line L3 indicates the optical axis of the imaging unit 21 (imaging optical system 22). Then, by matching the line of sight L2 of the observer's eye E with the optical axis L3 of the imaging unit 21, the observer is acquired by the imaging unit 21 with the same feeling as when viewing the external image with his / her own eye E. You can see images of the outside world. The video displayed on the display panel 12 is generated by processing a signal from the image sensor 23 by an image supply device 50 such as a personal computer or a video processing device, and is supplied from the image supply device 50. The head mounted display 1 and the image supply device 50 constitute an image display system.

  As shown in FIG. 3 in an enlarged manner, the connecting unit 15 includes a fixing member 16 that is integrally attached to the display unit 10 and has a convex spherical surface 16a. The connecting unit 15 includes a movable member 17 that is integrally attached to the imaging unit 21 and has a concave spherical surface 17a having the same center C and the same diameter d2 as the convex spherical surface 16a. The convex spherical surface 16a of the fixed member 16 and the concave spherical surface 17a of the movable member 17 are in contact with each other. For this reason, the movable member 17 is centered on the center C of the spherical surfaces 16a, 17a with respect to the fixed member 16, and the three axes (x, y, z axes) directions θx, θy, θz shown in FIG. That is, it can be rotated in any direction. As described above, the fixed member 16 and the movable member 17 are provided integrally with the display unit 10 and the imaging unit 21, respectively. Therefore, the connecting unit 15 functions as a connecting mechanism that connects (holds) the imaging unit 21 to the display unit 10 so as to be rotatable in the directions θx, θy, and θz around the three axes. The connecting unit 15 is a so-called ball joint using a spherical seat.

  In FIG. 2, the x, y, and z axes are shown at positions shifted from the center C, but these three axes are actually orthogonal to each other at the center C. The z-axis extends in the left-right direction of the display unit 10 and the imaging unit 21 (direction perpendicular to the paper surface of FIG. 2), and the y-axis extends in the up-down direction. The x-axis extends in the direction of the observer's line of sight L2.

  The movable member 17 is formed with a female screw hole 17c extending toward the rotation center C, and a lock screw 18 as a single lock member is screwed into the female screw hole 17c.

  A contact member 19 that is in contact with the convex spherical surface 16 a of the fixing member 16 is fixed to the lower end portion of the lock screw 18. The contact member 19 is a member for improving the slidability with the convex spherical surface 16a. The movable member 17 (imaging unit 21) rotates about the three axes with respect to the fixed member 16 (display unit 10) by tightening the lock screw 18 and pressing the concave spherical surface 17a and the convex spherical surface 16a strongly. Is blocked, that is, fixed. Further, by loosening the lock screw 18 and slightly pressing the concave spherical surface 17a and the convex spherical surface 16a, the movable member 17 (imaging unit 21) can rotate about the three axes with respect to the fixed member 16 (display unit 10). An allowed state, that is, a state in which the fixation is released.

  As shown in FIG. 3, a hexagonal hole (hexagonal hole) 18 a is formed in the head of the lock screw 18. The hexagonal portion of the shaft 27 constituting the alignment adjusting tool 25 as an operation member is engaged with the hexagonal hole portion 18a. As shown in FIG. 4, a groove portion 17 b extending in the z-axis direction through the female screw hole 17 c is formed on the outer peripheral surface of the movable member 17. FIG. 4 shows a cross section of the connecting unit 15 shown in FIG. 3 taken along line BB and viewed from the direction of the arrow.

  Here, FIG. 5 shows the alignment adjusting tool 25. The alignment adjustment tool 25 includes a cylindrical portion 26 and a shaft 27 that is rotatably attached to the cylindrical portion 26. A protrusion 26 a is provided on the outer peripheral portion of the tip of the cylindrical portion 26. These protrusions 26 a have shapes that can be engaged with grooves 17 b formed in the movable member 17. A hexagonal portion 27 a that can be engaged with the hexagonal hole portion 18 a of the lock screw 18 is formed at the tip of the shaft 27. The alignment adjustment tool 25 can be attached to and detached from the movable member 17 and the lock screw 18.

  When the position of the optical axis L3 of the imaging unit 21 is adjusted with respect to the optical axis L2 of the display unit 10, the protrusion 26a of the adjustment tool 25 and the hexagonal portion 27a of the shaft 27 are respectively movable members 17 as shown in FIG. The groove portion 17b and the hexagonal hole portion 18a of the lock screw 18 are engaged.

  Next, the shaft portion 27 is rotated with respect to the cylindrical portion 26 and the lock screw 18 is tightened to some extent. Shaking of the movable member 17 can be prevented by appropriately setting the tightening amount and pressing the concave spherical surface 17a and the convex spherical surface 16 lightly. Thereby, alignment adjustment precision can be raised.

  Then, by moving the entire alignment adjusting tool 25 so as to be inclined in the directions around the three axes θx, θy, θz, the movable member 17 is rotated in the directions around the three axes θx, θy, θz with respect to the fixed member 16. be able to. Thereby, alignment adjustment can be performed in the directions θx, θy, and θz around the three axes with respect to the display unit 10 of the imaging unit 21 around the spherical center C.

  As shown in FIG. 6, the alignment adjustment includes a display center (virtual image point) P1 on the extension line of the optical axis (line of sight) L2 of the display unit 10 and an imaging center P2 on the extension line of the optical axis L3 of the imaging unit 21. This is performed so that the vertical and horizontal positions of the same. The alignment adjustment is performed so that the rotation angle of the display image (the long side of the image) matches the horizontal line of the outside world.

  When the alignment adjustment is completed, the shaft 27 is rotated with respect to the cylindrical portion 26, the lock screw 18 is tightened, and the movable member 17 is fixed to the fixed member 16. Since the movable member 17 may rotate around the y axis as the lock screw 18 is tightened, the adjuster does not rotate the cylindrical portion 26 engaged with the movable member 17 around the y axis. This can be prevented by holding. After fixing the movable member 17 to the fixed member 16, the alignment adjustment tool 25 is removed from the movable member 17 and the lock screw 18.

  When the spherical center (rotation center) C of the connecting unit 15 and the imaging center P2 of the imaging unit 21 are not on the extension line of the observer's line of sight L2, the line of sight L2 and the optical axis L3 of the imaging unit 21 are angular. It will shift to. However, the positional deviation between the display unit 10 and the imaging unit 21 is mainly due to an attachment error, and is actually about 0.5 mm. Since this is slight with respect to the distance (2 m) to the display center P1 and the imaging center P2, the above-described angular deviation can be ignored in practice.

  The mounting mechanism 3 is attached to the band 7, the frames 4, 5 that are fixed (or integrally formed) with respect to the main body 2 and that extend left and right, a flexible band 7 that connects the rear end portions thereof, And a rear head presser 8. The frames 4 and 5 are provided with knobs 4a and 5a for operating a ratchet mechanism (not shown) for adjusting the length of the band 7, respectively. By moving the knobs 4 a and 5 a in the direction of arrow A in FIG. 1, the back head presser 8 can be moved back and forth together with the band 7. Thereby, an observer's head can be pinched | interposed between the forehead presser 6 provided in the main body 2, and the head mounted display 1 is set to a head so that the main body 2 is located in front of both eyes. Can be installed.

  As described above, in this embodiment, the operation of loosening the lock screw 18 with the alignment adjustment tool 25 and the operation of tilting the alignment adjustment tool 25 cause the movable member 17 to rotate around the three axes θx, θy, θz. Can be rotated. For this reason, alignment adjustment of the imaging unit 21 around the three axes with respect to the display unit 10 can be performed simultaneously. After the adjustment, the movable member 17 can be simultaneously fixed in the directions around the three axes θx, θy, and θz by performing an operation of tightening the lock screw 18. Therefore, according to the present embodiment, in the conventional alignment adjustment around three axes, an operation for each axis is required, or the alignment adjustment around one axis affects the alignment around the other axis. Therefore, it is possible to avoid the necessity of repeating readjustment.

  Further, since the connecting unit 15 can be configured with at least three components of the fixed member 16, the movable member 17, and the lock screw 18, it is optimal for the head mounted display 1 that is required to be structurally simple and lightweight. is there.

  Further, in order to reduce the size of the main body 2, it is necessary to reduce the distance between the display unit 10 and the imaging unit 21 as much as possible. For this purpose, it is necessary to reduce the longitudinal length d1 of the connecting unit 15 shown in FIG. . Further, in order to increase the coupling force (strength at which the fixed member 16 holds the movable member 17), it is necessary to increase the diameter d2 of the spherical surface of the coupling unit 15. The connecting unit 15 described in the present embodiment has a structure that can satisfy such a requirement. Furthermore, since the alignment adjustment tool 25 is attached from the direction orthogonal to the axial direction (x-axis direction) of the connecting unit 15 and adjustment work can be performed, it is easy to secure an adjustment space and workability is good.

  FIG. 7 shows the configuration of a connection unit of a head mounted display that is Embodiment 2 of the present invention. In the present embodiment, components that are the same as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment even when not shown. FIG. 7 shows x, y, and z axes at positions shifted from a spherical center C, which will be described later. These three axes are actually orthogonal to each other at the center C.

  Reference numeral 30 denotes a fixing member integrally attached to the display unit 10 (or the support member 14) shown in the first embodiment, and includes a hemispherical convex spherical surface 30a and a hemispherical protrusion 30b. The apex portion of the protrusion 30 b coincides with the center C of the convex spherical surface 30 a of the fixing member 30. Reference numeral 31 denotes a movable member integrally attached to the imaging unit 21 shown in the first embodiment, and has a concave spherical surface 31 a that abuts on the convex spherical surface 30 a of the fixed member 30. The convex spherical surface 30a and the concave spherical surface 31a have the same center C and radius. The connection mechanism of this embodiment is also one of ball joints using a spherical seat.

  The movable member 31 is integrally attached with a side surface portion 32a of an L-shaped plate 32 having elasticity formed of a metal plate or the like. The upper surface portion of the L-shaped plate 32 is in contact with the protrusion 30 b of the fixing member 30.

  Reference numeral 33 denotes a lock screw having a bolt shape. The male screw portion of the lock screw 33 is fastened to the female screw portion 31 b formed in the movable member 31 through a hole portion 32 b formed in the upper surface of the L-shaped plate 32. For this reason, the movable member 31 is urged by the elasticity of the L-shaped plate 32 so that the concave spherical surface 31 a is in pressure contact with the convex spherical surface 30 a of the fixed member 30.

  The movable member 31 is held so as to be rotatable with respect to the fixed member 30 about the spherical surface center C with the spherical surface 31a as a sliding surface. The movable member 31 is fixed to the fixed member 30 by tightening the lock screw 33.

  An adjustment shaft 36 is detachably attached to the side surface of the movable member 31. In the center of the lock screw 33. A through hole 33 a extending in the axial direction is formed, and a hexagonal hole 33 b is formed in the head of the lock screw 33.

  An alignment adjustment tool 35 includes round shaft portions 35a and 35c and a hexagonal portion 35b provided between the round shaft portions 35a and 35c. The round shaft portion 35c on the distal end side is inserted in a through hole 33a formed in the lock screw 33 so as to be insertable / removable. Further, the hexagonal portion 35b is detachably engaged with the hexagonal hole portion 33b of the lock screw 33.

  When adjusting the alignment of the imaging unit 21 with respect to the display unit 10, as shown in FIG. 7, the shaft portion 35 c of the alignment adjustment tool 35 is inserted into the through hole 33 b of the lock screw 33, and the hexagonal portion 35 b is inserted into the lock screw 33. Engage with the hexagonal hole 33b. In this way, the alignment adjustment tool 35 is attached to the movable member 31.

  Then, the shaft 35 a is rotated and the lock screw 33 is appropriately tightened, and both spherical surfaces 30 a and 31 a are lightly pressed by the elastic force of the L-shaped plate 32 to remove the sliding of the movable member 31 with respect to the fixed member 30. Thereafter, the alignment adjustment tool 35 and the adjustment shaft 36 are operated to be inclined so that the movable member 31 (imaging unit 21) is centered on the spherical surface in the directions θx, θy, and θz about three axes with respect to the fixed member 30 (display unit 10). Rotate around C. Thereby, alignment with respect to the display unit 10 of the imaging unit 21 is adjusted.

  After the alignment adjustment, the lock screw 33 is tightened with the alignment adjustment tool 35 to fix the movable member 31 to the fixed member 30. Then, the alignment adjustment tool 35 and the adjustment shaft 36 are removed from the lock screw 33 and the movable member 31, respectively.

  According to the present embodiment, since the spherical surfaces 30a and 31a are hemispherical surfaces, the connecting unit can be approximately half the size of the first embodiment in the height direction (y-axis direction). This is advantageous in terms of space. Further, by sliding the spherical surfaces 30a and 31a in pressure contact with each other by the elastic force of the L-shaped plate 32, it is possible to prevent misalignment due to play of the sliding portion and misalignment when the lock pin 33 is tightened. can do.

  FIG. 8 schematically shows the configuration of a head mounted display that is Embodiment 3 of the present invention. In the head mounted display of FIG. 8, the connecting unit described in the first embodiment is provided not only between the display unit and the imaging unit but also between the left and right display units.

The head mounted display includes a right display unit 10R that presents an image to the right eye ER of the observer, a right imaging unit 21R, and a connecting unit 15R that connects them. The head mounted display includes a left display unit 10L that presents an image to the left eye EL of the observer, a left imaging unit 21L, and a connecting unit 15L that connects them. Furthermore, with a connecting unit 15C which connects the right display unit 10R and the left-side display unit 10 L.

  The alignment of the right imaging unit 21R with respect to the right display unit 10R is adjusted by the connection unit 15R by the method described in the first embodiment. Similarly, the alignment of the left imaging unit 21L with respect to the left display unit 10L is adjusted by the connecting unit 15L. Further, similarly, the alignment of the left display unit 10L with respect to the right display unit 10R is adjusted by the connecting unit 15C. In this way, the alignment of each unit with respect to the observer's eyes ER and EL is adjusted.

  In this embodiment, the connection unit described in the first embodiment is used, but the connection unit described in the second embodiment may be used instead. The same applies to other embodiments described later.

  FIG. 9 schematically shows the configuration of a head mounted display that is Embodiment 4 of the present invention. In the configuration of the head mounted display shown in the third embodiment (FIG. 8), the force by the adjuster acts on the display unit side during alignment adjustment of each imaging unit with respect to each display unit. For this reason, the display unit needs to have such rigidity that it does not deform even when the force is applied. Accordingly, the weight of the display unit increases, and the weight of the entire head mounted display may increase.

  The head mounted display of the present embodiment has a configuration that can avoid such an increase in weight. That is, the head mounted display of the present embodiment has a base (supporting member) 40 serving as a support base for each unit. The left and right display units 10R and 10L and the left and right imaging units 21R and 21L are connected to the base 40 using connection units 15R1, 15R2, 15L1 and 15L2.

  Thereby, if the base 40 is fixed to the jig, even if a load is applied by the adjuster during alignment adjustment of each unit, the load does not directly act on other units. Therefore, it is not necessary to increase the rigidity of the unit in order to prevent deformation of the display unit or the imaging unit, and the weight can be reduced.

  FIG. 10 schematically shows the configuration of a head mounted display that is Embodiment 5 of the present invention.

  In the head mounted display of the present embodiment, the connection units 15C1 and 15R described in the first embodiment are provided between the left and right display units 10R and 10L, and between the right display unit 10R and the right imaging unit 21R, respectively. ing. Further, the connecting unit 15C2 described in the first embodiment is also provided between the left and right imaging units 21R and 21L.

  The alignment of the right imaging unit 21R with respect to the right display unit 10R is adjusted by the connection unit 15R by the method described in the first embodiment. Similarly, the alignment of the left display unit 10L with respect to the right display unit 10R is adjusted by the connecting unit 15C1. Further, the alignment of the left imaging unit 21L with respect to the right imaging unit 21R is adjusted by the connecting unit 15C2.

  In this way, the alignment of each unit with respect to the observer's eyes ER and EL is adjusted.

  As described above, according to each of the embodiments described above, the alignment adjustment around the three orthogonal axes of the imaging unit or the display unit and the fixing after the adjustment are required at the same time, that is, adjustment and fixing for each axis are required. Can be done without. Therefore, after adjusting the alignment around one axis, adjusting the alignment around the other axis causes a shift in the alignment around the first axis, and the trouble of performing the alignment adjustment around that axis again. Can be eliminated.

  In addition, since the operation member for fixing and releasing the fixing in the connecting unit also serves as a tool for performing the alignment adjustment operation, the adjustment work can be easily performed.

  In each of the above-described embodiments, the case where the imaging unit is rotatably connected to the display unit by the connecting unit has been described. However, the display unit may be rotatably connected to the imaging unit. .

  In each of the above-described embodiments, a head mounted display having a display unit and an imaging unit is described. However, the present invention can also be applied to a head-mounted display having one display unit and one imaging unit for single-eye observation. In addition, the present invention can be applied to a head mounted display in which one of the display unit and the imaging unit is a pair of left and right and the other is one (common to the left and right).

  Furthermore, the present invention can also be applied to a head-mounted display that does not have an imaging unit and has a left and right display unit and is not a video sheath type.

1 is a perspective view showing a sheath-type head mounted display that is Embodiment 1 of the present invention. FIG. FIG. 2 is a schematic diagram illustrating a configuration within a main body of the head mounted display according to the first embodiment. FIG. 3 is an enlarged side view illustrating a connection unit of the head mounted display according to the first embodiment. 4 of the head mounted display of Example 1 is front sectional drawing which shows a connection unit (BB sectional drawing in FIG. 3). FIG. 3 is a perspective view showing an alignment adjustment tool of Example 1. FIG. 3 is an explanatory diagram illustrating an alignment adjustment method according to the first embodiment. The front view which shows the connection unit of the head mounted display which is Example 2 of this invention. FIG. 6 is a top view showing a configuration of a head mounted display that is Embodiment 3 of the present invention. FIG. 6 is a top view showing a configuration of a head mounted display that is Embodiment 4 of the present invention. FIG. 6 is a top view showing a configuration of a head mounted display that is Embodiment 5 of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Video sheath type head mounted display 2 Main body 3 Mounting mechanism 10, 10R, 10L Display unit 11 Prism lens 12 Display panel 14 Support member 15, 15C, 15R, 15L, 15C1, 15C2, 15R1, 15R2, 15L1, 15L2 Connection unit 16 , 30 Fixed member 17, 31 Movable member 18, 33 Lock screw 21, 21R, 21L Imaging unit 22 Imaging optical system 23 Imaging element 25, 35 Alignment adjustment tool 32 L-shaped plate 36 Adjustment shaft

Claims (9)

A first and a second imaging unit including an imaging element, respectively,
First and second display unit including pre Symbol Table示素Ko simply showing display the image generated by using an output from an imaging element, respectively,
A first coupling mechanism that couples the first imaging unit and the first display unit so as to be relatively rotatable about three axes intersecting each other;
A single first member operated to fix and release the first connecting mechanism around three axes;
A second coupling mechanism that couples the first and second display units so as to be relatively rotatable about three axes that intersect each other;
An image display device comprising: a single second member operated to fix and release the second connecting mechanism around three axes. A third coupling mechanism that couples the second imaging unit and the second display unit so as to be relatively rotatable about three axes intersecting each other;
The image display apparatus according to claim 1, further comprising: a single third member that is operated to fix and release the third connection mechanism around three axes.   The image display apparatus according to claim 1, further comprising a support member that supports the first and third coupling mechanisms. Each of the first and second members is a single screw;
4. The image display apparatus according to claim 1, wherein the first and second members are respectively screwed into screw holes formed in the first and second coupling mechanisms. 5. . The first and second coupling mechanisms are mechanisms that abut the convex spherical surface and the concave spherical surface so as to be relatively rotatable,
The image display device according to claim 4, wherein the screw hole is formed in a member having the concave spherical surface. Removably attached to the first and second members, each having an operation member for operating the first and second members,
6. The image display device according to claim 1, wherein the first and second coupling mechanisms have a structure that is rotated around the three axes by the operation member. 7. The image display apparatus according to any one of claims 1 to 6, characterized in that it comprises a first and respectively the second display unit, an observation optical system for observing the image displayed before Symbol Table示素Ko . An image display device according to any one of claims 1 to 7,
Video Sea sul head mounted display characterized by having a a mounting mechanism for mounting on the head of the observer to place in front of the eyes of the observer who observes the image displayed before Symbol Table示素Ko . A video sheath type head mounted display according to claim 8,
To the video Sea sul head-mounted display, and an image supply apparatus for supplying an image to be displayed before Symbol Table示素Ko the synthesized image another image to images based on the output from the previous SL IMAGING element An image display system comprising: