WO2023157774A1

WO2023157774A1 - Electronic goggles

Info

Publication number: WO2023157774A1
Application number: PCT/JP2023/004643
Authority: WO
Inventors: 大樹犬飼; 岳福嶋; 慶人青島
Original assignee: 国立大学法人東海国立大学機構
Priority date: 2022-02-21
Filing date: 2023-02-10
Publication date: 2023-08-24

Abstract

Provided are electronic goggles capable of protecting eyes from various kinds of light generated in an external environment. The electronic goggles comprise an image data acquisition unit that acquires image data on an inverted real image imaged on a light-receiving surface through a first lens. The electronic goggles comprise a display unit that displays a reproduced image on a display surface on the basis of the image data. The electronic goggles comprise a second lens that forms an erect virtual image of the reproduced image displayed on the display unit. Assuming that a first distortion rate represents the percentage of a difference between an actual image height and an ideal image height to the ideal image height on the light-receiving surface and a second distortion rate represents the percentage of a difference between the actual image height and the ideal image height to the ideal image height in the erect virtual image, the sign of the first distortion rate is opposite to the sign of the second distortion rate.

Description

electronic goggles

This application claims priority based on Japanese Patent Application No. 2022-024882 filed on February 21, 2022. The entire contents of that application are incorporated herein by reference. This specification discloses technology related to electronic goggles.

It may be necessary to properly protect the eyes from various types of light (eg laser, ultraviolet light, arc light) generated in the external environment. Incidentally, Japanese Laid-Open Patent Publication No. 9-61750 discloses a related technique.

Proposing electronic goggles that can properly protect the eyes from various types of light in the external environment.

This specification discloses electronic goggles. The electronic goggles have an image data acquisition unit that acquires image data of an inverted real image formed on the light receiving surface through the first lens. Electronic goggles have a display unit that displays a reproduced image on a display surface based on image data. The electronic goggles have a second lens that forms an erect virtual image of the reproduced image displayed on the display. On the light-receiving surface, the percentage of the difference of the ideal image height from the actual image height to the ideal image height is defined as the first distortion rate, and in the erect virtual image, the ideal image height from the actual image height. When the second distortion rate is the percentage of the difference with respect to the ideal image height, the sign of the first distortion rate is opposite to the sign of the second distortion rate.

In the electronic goggles of this specification, the image data acquired by the image data acquisition unit is displayed as a reproduced image on the display unit, and the reproduced image is projected onto the eyeball. As a result, external light is not transmitted directly to the eyeballs, so the eyes can be protected from various types of light (eg, laser, ultraviolet light, arc light) generated in the external environment. Since the sign of the distortion rate of the first lens and the sign of the distortion rate of the second lens are opposite, the distortion can be optically canceled. Since image processing time is unnecessary compared to the case where distortion is corrected by software through image processing, it is possible to suppress the occurrence of delays in reproduced images. It is possible to give the user a comfortable feeling of wearing.

The first distortion rate may be negative distortion. The second distortion rate may be positive distortion.

When the difference of the ideal image height from the actual image height when the distortion of the first lens and the distortion of the second lens cancel each other out, the percentage of the ideal image height is defined as the third distortion rate. The third distortion rate may be lower than the first distortion rate and the second distortion rate. The maximum value of the third distortion rate may be ±5% or less.

The ratio of the actual image height to the ideal image height in the inverted real image on the light receiving surface is defined as the first ratio, and the ratio of the actual image height to the ideal image height in the erect virtual image is defined as the second ratio. , the value of the product of the first ratio and the second ratio may be in the range of 0.95 to 1.05.

The value of the product of the first ratio and the second ratio may be approximately one.

The first lens may be a wide-angle lens with an angle of view of 50° or more.

The image data acquired by the image data acquisition unit may be video data. The display unit may display a moving image based on the moving image data on the display surface in real time.

The electronic goggles may include a first unit including an image data acquisition section, a display section, and a second lens. The electronic goggles may comprise a second unit comprising an image data acquisition portion, a display portion and a second lens. The electronic goggles may include a retention mechanism configured to be securable to the user's head. The electronic goggles may comprise a first connection connected at one end to the first unit and at the other end to the retention mechanism. The electronic goggles may comprise a second connection, one end of which is connected to the second unit and the other end of which is connected to the retention mechanism. The first unit and the second unit may be configured to be disconnected from each other.

The first connecting portion may be configured so that the first unit can rotate about the other end. The second connecting portion may be configured such that the second unit can rotate about the other end.

1 is a schematic cross-sectional view of the electronic goggles 1 in a cross section (XZ plane); FIG. 1 is a schematic cross-sectional view of the electronic goggles 1 in a vertical cross section (YZ plane); FIG. It is an optical-path figure of the 1st lens 21R. It is a figure of the distortion rate of the 1st lens 21R. It is an optical path diagram of the second lens 17R. It is a figure of the distortion rate of the 2nd lens 17R. FIG. 10 is a diagram of the distortion rate after distortion cancellation; FIG. 10 is a perspective view of electronic goggles 101 according to Example 2; FIG. 11 is an optical path diagram showing an inverted real image according to Example 3; FIG. 11 is an optical path diagram showing an erect virtual image according to Example 3;

(Configuration of electronic goggles 1)
FIG. 1 shows a schematic cross-sectional view of the electronic goggles 1 in a cross section (XZ plane) including the optical axis at both eyes. FIG. 2 shows a schematic cross-sectional view of the electronic goggles 1 along the vertical cross section (YZ plane) taken along line II-II in FIG. 1 and 2, the direction in which the display unit 18R is viewed from the right eyeball 30R is the +Z direction. The X-direction and the Y-direction are two orthogonal directions that form a plane substantially perpendicular to the Z-direction. The direction from the left eyeball 30L to the right eyeball 30R is the +X direction. The upward direction is the +Y direction. The relationship in the X, Y, and Z directions is the same in the subsequent drawings as well.

A YZ plane located between the left eyeball 30L and the right eyeball 30R is defined as a central plane CP. The electronic goggles 1 have a line-symmetrical structure with respect to the central plane CP. Components on the right side (+X direction side) with respect to the center plane CP are denoted by "R" at the end of the reference numerals. Further, "L" is added to the end of the reference numerals for components on the left side (-X direction side) of the center plane CP. In addition, below, the configuration on the right side of the central plane CP will be described, and the description of the configuration on the left side may be omitted. As for the configuration on the left side of the center plane CP, the suffix "R" of the reference numerals may be read as "L".

FIG. 1 shows a state in which the electronic goggles 1 are worn by a user. A state in which the user's right eyeball 30R and left eyeball 30L are placed at predetermined positions PR and PL is shown.

The electronic goggles 1 are equipped with

housings

10R and 10L and cameras 20R and 20L. A goggle shape is formed by connecting the

housings

10R and 10L by the connecting portion 40. As shown in FIG. An X-direction distance DD between the

housings

10R and 10L can be adjusted by a screw mechanism provided in the connecting portion 40 or the like. This makes it possible to match the distance between the centers of the

second lenses

17R and 17L to the interpupillary distance of the right eyeball 30R and the left eyeball 30L.

The camera 20R is arranged on the outer surface on the +z direction side of the front part 11R of the housing 10R. The camera 20R is a device that acquires image data of an inverted real image formed on the image sensor 22R via the first lens 21R. The image data acquired by the camera 20R is moving image data. In Example 1, the first lens 21R is a single convex spherical lens and is a wide-angle lens with an angle of view of 50° or more.

The housing 10R includes a front portion 11R, an outer wall 12R, an inner wall 13R, an upper wall 14R, a lower wall 15R, a lens holding portion 16R, a second lens 17R, and a display portion 18R. The front portion 11R is a plate-like member substantially parallel to the XY plane. A display portion 18R is arranged on the inner surface of the front portion 11R on the -z direction side. The display unit 18R is a flat liquid crystal display panel. The display unit 18R is connected to the camera 20R via wiring and a control unit (not shown). As a result, it is possible to display a moving image based on the moving image data acquired by the camera 20R on the display unit 18R in real time. Here, the real-time display is a display with a delay time on the order of milliseconds or microseconds. The real-time display makes it possible to suppress discomfort when wearing the electronic goggles 1 .

The lens holding portion 16R is a portion that holds the second lens 17R. The second lens 17R is a single convex spherical lens. The second lens 17R is an eyepiece lens that enlarges and projects the reproduced image displayed on the display unit 18R onto the right eyeball 30R. That is, an erect virtual image of the reproduced image can be formed by the second lens 17R, and the virtual image can be looked into by the right eyeball 30R. The second lens 17R is arranged such that its optical axis OA2 coincides with the predetermined position PR.

In FIG. 1, light rays emitted from the right end and left end of the display section 18R and entering the right eyeball 30R are indicated by light rays L1R and L2R, respectively. Light rays L1R and L2R indicate light rays that are emitted from the right end position in the +X direction of the display section 18R and enter the right eyeball 30R. In FIG. 2, light rays L3R and L4R indicate light rays emitted from the upper end portion and the lower end portion of the display portion 18R and entering the right eyeball 30R, respectively. The image light emitted from the display surface of the display section 18R in the -Z direction is transmitted through the second lens 17R, converged, and enters the predetermined position PR of the right eyeball 30R.

The +X direction side of the second lens 17R is covered with the outer wall 12R, and the -X direction side is covered with the inner wall 13R. The +Y direction of the second lens 17R is covered with the upper wall 14R, and the -Y direction is covered with the lower wall 15R. As a result, the inside of the housing 10R is completely shielded from light from all directions, so external light does not directly enter the right eyeball 30R.

(Distortion rate of the first lens 21R)
The angle of view and the distortion rate of the first lens 21R of the camera 20R will be described with reference to the optical path diagram of FIG. 3 and the distortion rate diagram of FIG. In the camera 20R, the subject OB is positioned outside (+Z direction side) of the front focus f1 of the first lens 21R. Further, the image sensor 22R is arranged on the rear focus f1'. As a result, an inverted real image is formed and focused on the image sensor 22R. Then, due to the distortion of the first lens, the photographed image is deformed into a barrel shape.

Generally, if the maximum angle of view is 90° or more, it is said that the major viewing angles of humans can be covered. In Example 1, the height IH of the image sensor 22R in the Y direction is twice the focal length FL1 of the first lens 21R. As a result, the maximum half angle of view AL1 on the lower side is 45°, the maximum half angle of view AU1 on the upper side is 45°, and the total maximum angle of view is 90°. Therefore, it is possible to provide the user with a sufficient viewing angle. Such a wide maximum angle of view can be realized by using a wide-angle lens with an angle of view of 50° or more as the first lens 21R.

The image height H1 of the image sensor 22R can be obtained using the incident angle IA of light (the angle of light with respect to the optical axis OA1). Specifically, a formula of “image height H1=focal length FL1×tan (incidence angle IA)” holds.

In Example 1, the focal length FL1 of the first lens 21R was set to 6 mm, and the radius of curvature R1 was set to 3 mm. The height IH of the image sensor 22R is set to 12 mm. In this case, the image height H1 of the rays with the maximum half angle of view AL1 (45°) is 6 mm.

The distortion rate of the first lens 21R will be described using the distortion rate diagram of FIG. The vertical axis is the incident angle IA of light rays incident from the outside. The horizontal axis is the distortion rate. The distortion rate is the percentage of the difference of the ideal image height iy from the actual image height ry to the ideal image height iy ((ry-iy)/iy)×100) in the image sensor 22R. The left side of the horizontal axis indicates the positive distortion rate, and the right side indicates the negative distortion rate. As shown in FIG. 4, in the first lens 21R, the larger the incident angle IA (that is, the higher the image height), the lower the actual image height ry than the ideal image height iy. grow to At the maximum half angle of view (45°), the distortion rate is about -20%. Since the image height measured along the radiation from the imaging center is substantially the same along any radial direction, a plot of the distortion rate similar to that in FIG. 4 is obtained.

The focus of the camera 20R can be adjusted by the distance between the first lens 21R and the image sensor 22R. In Example 1, the distance to the subject OB is 30 cm or longer, and compared to the focal length FL1 of the first lens 21R=6 mm, it can be approximated to infinity, and is set so that focus adjustment is unnecessary.

(Distortion rate of the second lens 17R)
The angle of view and the distortion rate of the second lens 17R of the housing 10R will be described with reference to the optical path diagram of FIG. 5 and the distortion rate diagram of FIG. In the housing 10R, the display section 18R is arranged inside (-Z direction) of the front focal point f2 of the second lens 17R. As a result, an erect virtual image is formed on the display section 18R side of the second lens 17R. Due to the distortion of the second lens, the erect virtual image that can be seen with the right eyeball 30R is deformed into a pincushion shape.

The height DH of the display section 18R in the Y direction is twice the distance D2 between the second lens 17R and the display section 18R. As a result, the maximum half angle of view AL2 on the lower side is 45°, the maximum half angle of view AU2 on the upper side is 45°, and the total maximum angle of view is 90°. Therefore, it is possible to provide the user with a sufficient viewing angle.

The image height H2 of the display section 18R can be obtained using the light incident angle IA (the angle of the light ray with respect to the optical axis OA2). Specifically, the formula “image height H2=distance D2×tan (incidence angle IA)” holds.

Note that in Example 1, the distance D2 was set to 40 mm, and the radius of curvature R2 of the second lens 17R was set to 20 mm. The height DH of the display portion 18R is set to 80 mm. In this case, the image height of the rays with the maximum half angle of view AL2 (45°) is 40 mm.

The distortion rate of the second lens 17R will be described using the distortion rate diagram of FIG. The vertical axis is the incident angle IA of light rays incident from the display section 18R. The horizontal axis is the distortion rate. The distortion rate is the percentage of the difference of the ideal image height iy from the actual image height ry in the erect virtual image of the display unit 18R to the ideal image height iy (((ry−iy)/iy)×100). is. In the second lens 17R, the larger the incident angle IA (that is, the higher the image height), the higher the actual image height ry than the ideal image height iy, so the distortion rate increases on the positive side. At the maximum half angle of view (45°), the distortion rate is about +20%.

(Distortion rate obtained by combining the first lens 21R and the second lens 17R)
As shown in FIGS. 4 and 6, the sign (negative) of the distortion rate of the first lens 21R and the sign (positive) of the distortion rate of the second lens 17R are opposite. Therefore, by projecting the image captured through the first lens 21R onto the right eyeball 30R via the second lens 17R, the distortion of the image viewed through the right eyeball 30R can be optically canceled. Specifically, an image having a barrel-shaped distortion captured by the first lens 21R is displayed on the display unit 18R as it is. When the barrel-shaped image displayed on the display unit 18R is projected onto the right eyeball 30R through the second lens 17R having pincushion distortion, the distortion-cancelled image can be viewed with the right eyeball 30R. becomes.

That is, by canceling each other out the distortion rate in FIG. 4 and the distortion rate in FIG. 6, the image actually seen by the right eyeball 30R can have the distortion rate as shown in FIG. As shown in FIG. 7, it can be seen that the distortion rate is small over the entire incident angle IA. It can be seen that the maximum value is ±5% or less at the maximum half angle of view (45°). Generally, it is known that when the distortion rate at the maximum half angle of view is ±10% or more, the user feels uncomfortable. According to the technology of the present specification, the distortion rate at the maximum half angle of view can be suppressed to ±5% or less, so it is possible to suppress the discomfort felt by the user.

(effect)
In the electronic goggles 1 of this specification, moving image data acquired by the cameras 20R and 20L are displayed as real-time moving images on the

display units

18R and 18L, and the real-time moving images are projected onto the eyeballs via the

second lenses

17R and 17L. do. As a result, external light is not transmitted directly to the eyeballs, and thus the eyeballs can be protected from various kinds of light (eg, laser, ultraviolet light, arc light) generated in the external environment.

With a head-mounted display that can display stereoscopic images using the parallax of the left and right eyes, if the images are distorted due to the distortion of the eyepieces, the left and right images will not overlap, hindering stereoscopic vision. When image processing is performed on software in order to correct the distortion of the eyepiece lens, a delay occurs due to the processing time. This delay is especially problematic for real-time video. Therefore, the electronic goggles 1 of this specification are configured to project an image captured through the first lens 21R onto the eyeball through the second lens 17R. By reversing the sign of the first distortion rate of the first lens 21R and the sign of the second distortion rate of the second lens 17R, the distortion can be optically canceled. Since image processing time is not required compared to the case where distortion correction is performed by software through image processing, it is possible to suppress the occurrence of delays in reproduced images. It is possible to display a real-time image on the electronic goggles 1 without delay and discomfort. In the case of software-based distortion correction by image processing, the data captured by the camera is lost due to the position conversion of pixel coordinates, but in the case of optical distortion correction, the data captured by the camera is not lost, and the real-time image can be reproduced. can be displayed.

(Configuration of electronic goggles 101)
FIG. 8 shows a perspective view of electronic goggles 101 according to the second embodiment. Parts common to the electronic goggles 101 of the second embodiment and the electronic goggles 1 of the first embodiment are denoted by the same reference numerals, and description thereof is omitted. The electronic goggles 101 includes

housings

10R and 10R, a holding mechanism 150, a first connection portion 161, and a second connection portion 162. As shown in FIG.

The housing 10R has a camera 20R on the front part 11R. It also has a display section 18R and a second lens 17R inside. Similarly, the housing 10L has a camera 20L on the front portion 11L. Moreover, the display part 18L and the 2nd lens 17L are provided inside. A space is formed between the

inner walls

13R and 13L. Therefore, the housing 10R and the housing 10L are not connected to each other. The holding mechanism 150 is a mechanism that can be fixed to the user's head. The retention mechanism 150 may take various forms. In Example 2, a ring-shaped headband was used.

A first end portion 161E1 of the first connection portion 161 is connected to the outer wall 12R of the housing 10R. The second end portion 161E2 is connected to the right side surface (+X direction side surface) of the holding mechanism 150 via the rotating portion 171 . The rotating portion 171 is a rotating mechanism having a rotating shaft in the X direction. The position of the rotating portion 171 may be a position corresponding to the temple of the user wearing the electronic goggles 101 . The rotating portion 171 can rotate the housing 10R around the second end portion 161E2. As a result, the housing 10R can be moved upward (in the +Y direction) to the position indicated by the dashed line, as indicated by the arrow Y1.

Similarly, the first end portion 162E1 of the second connection portion 162 is connected to the outer wall 12L of the housing 10L. The second end portion 162E2 is connected to the left side surface (−X direction side surface) of the holding mechanism 150 via the rotating portion 172 . Further, the rotating portion 172 is configured to allow the housing 10L to rotate around the second end portion 162E2. This allows the housing 10L to move upward.

(effect)
In a general head-mounted display or the like, a housing for displaying an image is integrated with a holding mechanism for fixing the housing to the head. Therefore, if you want to move the housing away from your eyes, you need to remove the head-mounted display itself. On the other hand, in the electronic goggles 101 of Example 2, the

housings

10R and 10L for displaying images and the holding mechanism 150 are separate structures. As a result, as indicated by an arrow Y1, by moving only the

housings

10R and 10L while wearing the electronic goggles 101, it is possible to remove them from the front of the eyes. Since it is not necessary to remove the electronic goggles 101 from the head when it is necessary to check an object with the naked eye while using the electronic goggles 101, convenience can be improved.

In the electronic goggles 101 of Example 2, the

housings

10R and 10L are not connected to each other, but are independently supported by the first connecting portion 161 and the second connecting portion 162. This allows the

housings

10R and 10L to move upward independently of each other. While wearing the electronic goggles 101, it is possible to remove only the housing 10R, remove only the housing 10L, or remove both the

housings

10R and 10L.

(perfect compensation for distortion)
A configuration for completely compensating for lens distortion will be described. FIG. 9 shows an inverted real image showing negative distortion at the half angle of view AU1 in the first lens 21R of the camera 20R. FIG. 9 is an optical path diagram corresponding to the configuration of FIG. A distance FL1 is the distance from the principal point of the first lens 21R to the image sensor 22R. Position B is the position of the image sensor 22R. As described above, an inverted real image is formed on the image sensor 22R. In FIG. 9, the ideal image height is indicated by iy1, and the actual image height is indicated by ry1. Here, the ratio (ry1/iy1) of the actual image height ry1 to the ideal image height iy1 in the inverted real image is defined as the first ratio.

FIG. 10 shows an erect virtual image showing positive distortion of the half angle of view AU2 in the second lens 17R of the housing 10R. FIG. 10 is an optical path diagram corresponding to the configuration of FIG. Position A is the position of the display section 18R. A distance D2 is the distance between the second lens 17R and the display section 18R. In FIG. 10, the ideal image height of the erect virtual image is indicated by iy2, and the actual image height is indicated by ry2. Here, the ratio (ry2/iy2) of the actual image height ry2 to the ideal image height iy2 in the erect virtual image is defined as the second ratio.

In the electronic goggles 1 of this embodiment, the value of the product of the first ratio and the second ratio is within the range of 0.95 to 1.05. By setting it within this range, it is possible to completely compensate for the distortion when the line of sight is directed toward the optical axis OA2 of the second lens 17R. Moreover, it is possible to appropriately compensate for distortion when the line of sight is directed off the optical axis OA2.

It is more preferable that the value of the product of the first ratio and the second ratio is approximately one. For example, if the first ratio is 0.8, the second ratio should be 1.25. Thereby, the value of the product of the first ratio and the second ratio can be set to one. Also, the positive and negative of the distortion of the first lens and the second lens may be reversed.

Although the embodiments of the present invention have been described in detail above, they are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

(Modification)
The cameras 20R and 20L and the

housings

10R and 10L may be separated from each other. The moving image data acquired by the cameras 20R and 20L may be transmitted by wireless communication or the like and displayed on the display units 18R and 15L in real time. This makes it possible to show the user an image at a position distant from the user with little influence of delay and distortion. This enables precise operation when remotely controlling various devices (eg, drones, submarines, vehicles, surgical equipment).

The sign of the distortion rate of the first lens 21R may be positive (pincushion type), and the sign of the distortion rate of the second lens 17R may be negative (barrel type). Telephoto lenses generally exhibit pincushion distortion, which makes it possible to construct telephoto goggles capable of magnifying distant vision.

The camera 20R may have a mechanism capable of adjusting the distance between the first lens 21R and the image sensor 22R. When the subject OB approaches inward from infinity, focusing can be achieved by adjusting the position of the first lens 21R. Even in this case, since there is no significant change in the sign or absolute value of the distortion rate of the first lens 21R, it is possible to optically cancel the distortion.

The first lens 21R and the second lens 17R are not limited to single lenses, and may be combined lenses, for example.

The holding mechanism 150 is not limited to a headband, and may take various forms. For example, a helmet shape, a hat shape, or the like may be used.

The connecting part 40 may be detachable. By removing the connecting portion 40, the

housings

10R and 10L can be brought into a non-connected state. The

housings

10R and 10L can be moved independently of each other from the front.

The image sensor 22R is an example of a light receiving surface. The housing 10R is an example of a first unit. The housing 10L is an example of a second unit.

The technical elements described in this specification or drawings demonstrate technical usefulness either alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the techniques exemplified in this specification or drawings can simultaneously achieve a plurality of purposes, and achieving one of them has technical utility in itself.

1: Electronic goggles 10R: Housing 11R: Front part 16R: Lens holding part 17R: Second lens 18R: Display part 20R: Camera 21R: First lens 22R: Image sensor 30R: Right eyeball

Claims

an image data acquisition unit that acquires image data of an inverted real image formed on the light receiving surface through the first lens;
a display unit that displays a reproduced image on a display surface based on the image data;
a second lens that forms an erect virtual image of the reproduced image displayed on the display unit;
with
On the light-receiving surface, the percentage of the difference of the ideal image height from the actual image height to the ideal image height is defined as a first distortion rate, and in the erect virtual image, the ideal image from the actual image height. Electronic goggles, wherein the sign of the first distortion rate is opposite to the sign of the second distortion rate when the percentage of the difference in height with respect to the ideal image height is taken as the second distortion rate.
the first distortion rate is negative distortion;
2. The electronic goggles of claim 1, wherein said second rate of distortion is positive distortion.
When the percentage of the ideal image height difference from the actual image height when the distortion of the first lens and the distortion of the second lens cancel each other out is defined as a third distortion rate ,
the third distortion rate is lower than the first distortion rate and the second distortion rate;
3. The electronic goggles according to claim 1, wherein the maximum value of said third distortion rate is ±5% or less.
The ratio of the actual image height to the ideal image height in the inverted real image on the light receiving surface is defined as a first ratio, and the ratio of the actual image height to the ideal image height in the erect virtual image is defined as the first ratio. The electronic formula according to any one of claims 1 to 3, wherein the product of the first ratio and the second ratio is in the range of 0.95 to 1.05 when the ratio is 2. goggles.
The electronic goggles according to claim 4, wherein the product of said first ratio and said second ratio has a value of about one.
The electronic goggles according to any one of claims 1 to 5, wherein the first lens is a wide-angle lens with an angle of view of 50° or more.
The image data acquired by the image data acquisition unit is moving image data,
The electronic goggles according to any one of claims 1 to 6, wherein the display unit displays a moving image based on the moving image data on the display surface in real time.
a first unit including the image data acquisition section, the display section, and the second lens;
a second unit comprising the image data acquisition section, the display section, and the second lens;
a holding mechanism configured to be fixable to a user's head;
a first connection portion having one end connected to the first unit and the other end connected to the holding mechanism;
a second connection portion, one end of which is connected to the second unit and the other end of which is connected to the holding mechanism;
and
The electronic goggles according to any one of claims 1 to 7, wherein the first unit and the second unit are configured to be disconnected from each other.
The first connecting portion is configured so that the first unit can rotate around the other end,
9. The electronic goggles according to claim 8, wherein the second connecting portion is configured so that the second unit can rotate around the other end.