Pupil or cornea position detection device and head mount display

Abstract

To adjust a relative position between a light source part and a light receiving part with respect to a wearer.SOLUTION: A pupil or cornea position detection device provided on a mounting part mounted on a wearer comprises: a light source part; a light receiving part which receives at least a part of light emitted from the light source part and reflected by an eyeball of the wearer; and a moving part which translates the light source part and the light receiving part. The moving part varies a relative position between the light source part and the light receiving part relative to the mounting part.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a pupil or cornea position detection device and a head-mounted display. [Background technology]

[0002] For example, Patent Document 1 discloses a device that detects the pupil position based on the time change in the intensity of reflected light of a laser beam that is scanned at high speed on the surface of the eyeball. Summary of the Invention [Problem to be solved by the invention]

[0003] However, in the device described in Patent Document 1, when worn by a wearer, the relative positions of the light source unit that emits light such as laser light and the light receiving unit that receives the reflected light of the laser light by the eyeball may be misaligned relative to the wearer.

[0004] An object of the present invention is to make it possible to adjust the relative positions of the light source unit and the light receiving unit with respect to the wearer. [Means for solving the problem]

[0005] A pupil or cornea position detection device according to one aspect of the present invention is a pupil or cornea position detection device provided on a mounting part worn by a wearer, and includes a light source unit, a light receiving unit that receives at least a portion of the light emitted from the light source unit and reflected by the wearer's eyeball, and a moving unit that moves the light source unit and the light receiving unit in a translational manner, and the moving unit changes the relative positions of the light source unit and the light receiving unit with respect to the mounting part. [Effects of the Invention]

[0006] According to the present invention, the relative positions of the light source unit and the light receiving unit with respect to the wearer can be adjusted. [Brief explanation of the drawings]

[0007] [Figure 1]1 is a schematic perspective view showing a head-mounted display having a pupil or cornea position detection device according to a first embodiment of the present invention. [Figure 2] 1 is a schematic perspective view showing a state in which a head-mounted display having a pupil or cornea position detection device according to a first embodiment of the present invention is worn on the head of a wearer. [Figure 3] 1 is a schematic enlarged perspective view showing a state in which a pupil or cornea position detection device according to a first embodiment of the present invention is arranged on a head-mounted display. FIG. [Figure 4] 1 is a schematic top view showing the overall configuration of a pupil or cornea position detection device according to a first embodiment of the present invention; [Figure 5] 1 is a schematic front view showing the overall configuration of a pupil or cornea position detection device according to a first embodiment of the present invention; [Figure 6] 1 is a schematic side view showing the overall configuration of a pupil or cornea position detection device according to a first embodiment of the present invention. [Figure 7] 1 is a schematic perspective view showing the overall configuration of a pupil or cornea position detection device according to a first embodiment of the present invention. [Figure 8] 1A and 1B are first schematic top views illustrating the operation of the pupil or cornea position detection device according to the first embodiment of the present invention. [Figure 9] FIG. 4 is a second schematic top view showing the operation of the pupil or cornea position detection device according to the first embodiment of the present invention. [Figure 10] FIG. 10 is a schematic enlarged perspective view showing a state in which a pupil or cornea position detection device according to a second embodiment of the present invention is arranged on a head-mounted display. [Figure 11] FIG. 10 is a schematic top view showing the overall configuration of a pupil or cornea position detection device according to a second embodiment of the present invention. [Figure 12] FIG. 10 is a schematic front view showing the overall configuration of a pupil or cornea position detection device according to a second embodiment of the present invention. [Figure 13] FIG. 10 is a schematic side view showing the overall configuration of a pupil or cornea position detection device according to a second embodiment of the present invention. [Figure 14]FIG. 10 is a schematic perspective view showing the overall configuration of a pupil or cornea position detection device according to a second embodiment of the present invention. [Figure 15] FIG. 10 is a schematic side view showing a first mark and a second mark in a pupil or cornea position detection device according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0008] A pupil or cornea position detection device and a head-mounted display according to an embodiment of the present invention will be described in detail with reference to the drawings. However, the following embodiments are merely examples of the pupil or cornea position detection device and the head-mounted display according to the embodiment of the present invention, and are not limited to the following.

[0009] Furthermore, unless otherwise specified, the dimensions, materials, shapes, relative arrangements, etc. of components described in the embodiments of the present invention are merely illustrative examples and are not intended to limit the scope of the embodiments of the present invention to those specific embodiments. The sizes, positional relationships, etc. of components shown in the drawings may be exaggerated for clarity. In the following description, the same names and symbols indicate the same or similar components, and detailed descriptions will be omitted where appropriate.

[0010] In the following explanation, for ease of understanding, the arrangement and configuration of each part will be described using an XYZ Cartesian coordinate system. The three axes in the XYZ Cartesian coordinate system are mutually orthogonal. In the XYZ Cartesian coordinate system, the direction in which the X axis extends is referred to as the first direction X, the direction in which the Y axis extends is referred to as the second direction Y, and the direction in which the Z axis extends is referred to as the third direction Z. The direction in which the arrow indicating the X axis points is referred to as the +X direction or +X side, and the direction opposite to the +X direction is referred to as the -X direction or -X side. The direction in which the arrow indicating the Y axis points is referred to as the +Y direction or +Y side, and the direction opposite to the +Y direction is referred to as the -Y direction or +Y side. The direction in which the arrow indicating the Z axis points is referred to as the +Z direction or +Z side, and the direction opposite to the +Z direction is referred to as the -Z direction or -Z side.

[0011] However, the above directional expressions merely describe the relationship of relative position, orientation, direction, etc., and do not necessarily correspond to the relationship during use. Furthermore, these directions are unrelated to the direction of gravity. "Placing" is not limited to direct contact, but also includes indirect placement, for example, via another member. "Image" in this specification includes not only still images but also moving images. Moving images may also be called video.

[0012] [First embodiment] <Configuration of pupil or cornea position detection device according to the first embodiment of the present invention> The configuration of a pupil or cornea position detection device according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 7. FIG. 1 is a schematic perspective view showing a head mounted display (HMD) 200 having a pupil or cornea position detection device 100 according to the first embodiment of the present invention. FIG. 2 is a schematic perspective view showing a state in which the head mounted display 200 having the pupil or cornea position detection device 100 according to the first embodiment of the present invention is worn on the head 300H of a wearer 300. FIG. 3 is a schematic perspective view of the pupil or cornea position detection device 100 according to the first embodiment of the present invention, as viewed from the -Y side, showing a state in which the pupil or cornea position detection device 100 according to the first embodiment of the present invention is arranged on the head mounted display. FIG. 4 is a schematic top view showing the overall configuration of the pupil or cornea position detection device 100 according to the first embodiment of the present invention. FIG. 5 is a schematic front view showing the overall configuration of the pupil or cornea position detection device 100 according to the first embodiment of the present invention. FIG. 6 is a schematic side view showing the overall configuration of the pupil or cornea position detection device 100 according to the first embodiment of the present invention. FIG. 7 is a schematic perspective view of the pupil or cornea position detection device 100 as viewed from the +Y side, showing the overall configuration of the pupil or cornea position detection device 100 according to the first embodiment of the present invention.

[0013] Pupil or corneal position detection device 100 is a device for detecting either the pupil or the cornea, which is provided in a mounting part 201 that is mounted on a wearer 300 of pupil or corneal position detection device 100. For ease of explanation, the pupil or cornea will hereinafter be referred to as pupil P. Furthermore, pupil or corneal position detection device 100 will be simply referred to as position detection device 100.

[0014] As shown in FIGS. 1 and 2, the head-mounted display 200 includes a position detection device 100. In the example shown in FIGS. 1 and 2, the head-mounted display 200 includes a mounting unit 201 for a wearer 300, display units 202 that are disposed in front of the right and left eyes of the wearer 300 and display images, respectively, and a holder 203 that is connected to the mounting unit 201 and holds the display unit 202. The display unit 202 includes a right-eye display unit 202a that displays an image to be observed by the right eye of the wearer 300, and a left-eye display unit 202b that displays an image to be observed by the left eye of the wearer 300. The position detection device 100 is disposed near the left-eye display unit 202b, or from another perspective, near the left eye of the wearer 300. The position detection device 100 is disposed in the holder 203 of the head-mounted display 200. The position detection device 100 is worn by a wearer 300 via a wearing part 201 connected to a holding part 203 .

[0015] The head mounted display 200 is a headgear type head mounted display that is worn on the head 300H of the wearer 300 via a wearing part 201 made of a soft material such as nylon. However, the head mounted display 200 is not limited to the headgear type, and may be in various forms other than the headgear type, such as glasses type, hat type, or helmet type.

[0016] The head mounted display 200 is a display device that is worn by the wearer 300 and displays an image observed by the wearer 300. The image display method by the head mounted display 200 may be, for example, a method in which a real image or a virtual image displayed by a display element such as a liquid crystal or a DMD (Digital Micromirror Device) is observed by the wearer 300 via an optical system, or a method in which an image is directly drawn on the retina of the wearer 300.

[0017] In the example shown in this specification, the image display method by the head mounted display 200 is a so-called see-through method in which an image is displayed superimposed on the field of view of the wearer 300 with respect to the outside world. As shown in Figs. 3 and 5, an opening 61 is formed in the support part 6. The wearer 300 can observe the outside world through the opening 61. However, the image display method by the head mounted display 200 is not limited to the see-through method, and may be a so-called immersion method in which an image is displayed in a state in which the field of view of the wearer 300 with respect to the outside world is blocked, or may be a stereoscopic image display method using the parallax between the left and right eyes.

[0018] 4, the position detection device 100 includes a light source unit 1, a light receiving unit 2 that receives at least a portion of light Lo emitted from the light source unit 1 and reflected by the eyeball 50 of the wearer 300, and a moving unit 3 that translates the light source unit 1 and the light receiving unit 2. In the example shown in FIG. 4, the position detection device 100 includes an optical deflection unit 4 that is disposed in an optical path between the light source unit 1 and the eyeball 50 when the position detection device 100 is worn by the wearer 300 and deflects light Li1 emitted from the light source unit 1 in the direction where the eyeball 50 is located. Furthermore, the position detection device 100 includes a connection unit 5 that is connected to the wearer 300 and a support unit 6 that supports the light source unit 1 and the light receiving unit 2.

[0019] In FIG. 4, a portion of the light Li1 emitted from the light source unit 1 and incident on the light deflection unit 4 is indicated by a dashed-dotted arrow. Furthermore, a portion of the light Li2 reflected by the light deflection unit 4 and incident on the eyeball 50 is indicated by a two-dot dashed arrow. Furthermore, a portion of the light Lo reflected by the eyeball 50 is indicated by a dashed arrow. The paths taken by the light Li1 and the light Li2 correspond to the optical path between the light source unit 1 and the eyeball 50 when the position detection device 100 is worn by the wearer 300. In FIG. 4, the eyeball 50 and the wearer 300 are both indicated with the symbols for the purpose of indicating that the wearer 300 has the eyeball 50. In the drawings shown later, the symbols may also be used for the same purpose.

[0020] The position detection device 100 detects the position of the pupil P of the left eye of the wearer 300 and passes information regarding the position of the pupil P of the left eye to the head mounted display 200. The head mounted display 200 controls the display positions of images on the right eye display unit 202a and the left eye display unit 202b, respectively, based on the information regarding the position of the pupil P of the wearer 300 received from the position detection device 100. The head mounted display 200 can display high-quality images with reduced distortion, blur, vignetting, etc. by controlling the display positions according to the tilt or line of sight of the eyeball 50 of the wearer 300. Note that in the example shown in FIG. 2, the head mounted display 200 controls the display positions of images on the right eye display unit 202a and the left eye display unit 202b, respectively, based on the detection result of the pupil P of the left eye, under the assumption that the right eye and left eye of the wearer 300 move in approximately the same way.

[0021] In a pupil or cornea position detection device, at least a portion of light reflected by the eyeball must be incident on the light receiving unit. However, there are individual differences in the shape of the face, head, or eyeball of the wearer of the pupil or cornea position detection device. Specifically, there are individual differences in the interocular distance, the intercanthal distance, the distance from the forehead to the eye, and the like. For this reason, when a wearer wears a head-mounted display, the relative positions of the light source unit and the light receiving unit with respect to the wearer may be shifted from the appropriate positions, and the light reflected by the eyeball may not properly enter the light receiving unit. If the light reflected by the eyeball does not properly enter the light receiving unit, the pupil or cornea position detection device cannot detect the position of the wearer's pupil or cornea. In particular, a device that detects the position of the pupil or cornea based on the position of light reflected by the eyeball is more affected by the relative position shift between the light source unit and the light receiving unit due to individual differences in the shape of the wearer's face, etc., compared to a device that detects the position of the pupil or cornea using a photographic image of the pupil or cornea taken by a camera.

[0022] In the position detection device 100, the moving unit 3 translates the light source unit 1, the light receiving unit 2, and the light deflection unit 4. For example, the moving unit 3 changes the relative positions of the light source unit 1 and the light receiving unit 2 with respect to the wearing unit 201 so that at least a portion of the light Lo reflected by the eyeball 50 is incident on the light receiving unit 2. This makes it possible to adjust the relative positions of the light source unit 1 and the light receiving unit 2 with respect to the wearing unit 201. For example, the position detection device 100 can adjust the positions of the light source unit 1 and the light receiving unit 2 to appropriate positions with respect to the wearing unit 201 that are predetermined so that at least a portion of the light Lo reflected by the eyeball 50 is incident on the light receiving unit 2. As a result, even if there are individual differences in the shape of the face, head 300H, eyeball 50, etc., at least a portion of the light Lo reflected by the eyeball 50 is incident on the light receiving unit 2. The position detection device 100 can detect the position of the pupil P of the wearer 300. The head mounted display 200 can display high quality images whose display position is controlled according to the inclination of the eyeballs of the wearer 300, the line of sight, or the like.

[0023] The position detection device 100 can also be retrofitted to a head-mounted display that does not have a function for detecting the position of the pupil P, thereby adding the function for detecting the position of the pupil P to the head-mounted display. In this case, by adjusting the relative positions of the light source unit 1 and the light receiving unit 2 with respect to the mounting unit 201 according to individual differences in the shape of the face, head 300H, eyeball 50, etc. of the wearer 300, it becomes possible to detect the position of the pupil P of the wearer 300 while reducing the influence of the individual differences. Note that "post-installed" means that the position detection device 100 manufactured by a manufacturer other than the manufacturer of the head-mounted display 200 or the position detection device 100 manufactured in a factory other than the factory where the head-mounted display 200 is manufactured is mounted on the head-mounted display 200.

[0024] In the position detection device 100, the light Li2 emitted from the light source unit 1 is deflected by the optical deflection unit 4, and the light Li2 deflected by the optical deflection unit 4 is incident on the eyeball 50. The light receiving unit 2 receives at least a portion of the light Lo reflected by the eyeball 50 after being deflected by the optical deflection unit 4. The connection unit 5 is fixed to the lower surface (the surface on the -Y side) of the holding unit 203 with a screw member, an adhesive member, or the like. The connection unit 5 is connected to the attachment unit 201. For example, in a configuration in which the light Li1 emitted from the light source unit 1 is directly incident on the eyeball 50, the light receiving unit 2 needs to be located on the opposite side of the light source unit 1 with respect to the eyeball 50 so that the light receiving unit 2 receives the light Lo reflected by the eyeball 50. If the light receiving unit 2 is located on the opposite side of the light source unit 1 with respect to the eyeball 50, the configuration of the position detection device becomes complicated, and the wiring for driving the light source unit 1 and the light receiving unit 2 also becomes complicated.

[0025] In the position detection device 100, the light Li2 deflected by the optical deflection unit 4 is incident on the eyeball 50, so the light receiving unit 2 can be disposed on the same side as the light source unit 1 with respect to the eyeball 50. This simplifies the configuration of the position detection device 100 and the wiring for driving the light source unit 1 and the light receiving unit 2. Furthermore, the position detection device 100 can adjust the relative positions of the light source unit 1 and the light receiving unit 2 with respect to the wearing unit 201 by translating the light source unit 1, the light receiving unit 2, and the optical deflection unit 4 using the moving unit 3. This allows the position detection device 100 to detect the position of the pupil P of the wearer 300 even when there are individual differences in the shapes of the face, head 300H, eyeball 50, etc. However, the position detection device 100 does not necessarily have to include the optical deflection unit 4, and the light receiving unit 2 may be disposed on the opposite side of the eyeball 50 from the light source unit 1.

[0026] As shown in FIG. 2, in the head-mounted display 200, when the head-mounted display 200 is worn by the wearer 300, the position detection device 100 is disposed on the opposite side of the display unit 202 with respect to the left eye of the wearer 300. With this arrangement, the position detection device 100 is located away from the nose 300N located approximately in the center of the face, making it easier for a person to manually perform translational movement using the movement unit 3. In the example shown in FIG. 2, the left eye of the wearer 300 is located on the -Z side of the left-eye display unit 202b. The nose 300N of the wearer 300, the display unit 202, the left eye of the wearer 300, and the position detection device 100 are aligned in the first direction X. The nose 300N of the wearer 300 is located on the +X side of the left eye of the wearer 300. The position detection device 100 is located on the -X side of the left eye of the wearer 300.

[0027] The head mounted display 200 may also include a position detection device for the pupil P of the right eye of the wearer 300 and a position detection device for the pupil P of the left eye of the wearer 300. The position detection device for the pupil P of the right eye is arranged on the opposite side of the nose 300N of the wearer 300 with respect to the right eye of the wearer 300 when the head mounted display 200 is worn by the wearer 300. The position detection device for the pupil P of the left eye is arranged on the opposite side of the nose 300N of the wearer 300 with respect to the left eye of the wearer 300. With this configuration, the position detection device 100 can control the display position of an image by the right eye display unit 202a based on information about the position of the pupil P of the right eye of the wearer 300. Furthermore, the position detection device 100 can control the display position of an image by the left eye display unit 202b based on information about the position of the pupil P of the left eye of the wearer 300. As a result, the head mounted display 200 can display a high quality image whose display position is controlled with high precision according to the inclination of the eyeballs of the wearer 300, the line of sight direction, or the like.

[0028] 4, in the position detection device 100, the moving unit 3 is connected to the support unit 6. The moving unit 3 changes the relative position of the support unit 6 with respect to the connection unit 5. In the position detection device 100, the moving unit 3 can change the relative positions of the light source unit 1 and the light receiving unit 2 supported by the support unit 6 with respect to the mounting unit 201 of the head-mounted display 200 to which the connection unit 5 is connected.

[0029] As shown in Figure 3, the moving unit 3 includes a first moving unit 31 that moves the light source unit 1 and the light receiving unit 2 translationally in a first direction X, a second moving unit 32 that moves the light source unit 1 and the light receiving unit 2 translationally in a second direction Y, and a third moving unit 33 that moves the light source unit 1 and the light receiving unit 2 translationally in a third direction Z.

[0030] The first moving unit 31 includes a first movable member 381 connected to the support unit 6. The first movable member 381 is provided with a first elongated hole 311 extending in the first direction X. The first elongated hole 311 corresponds to a hole whose longitudinal direction is the direction of translation of the light source unit 1 and the light receiving unit 2. The direction of movement in the first elongated hole 311 is the first direction X. A part of a first positioning unit 312 is inserted into the first elongated hole 311. The first moving unit 31 is a slider mechanism that uses the first elongated hole 311 to move the first movable member 381 in the first direction X.

[0031] The first positioning portion 312 corresponds to the positioning portion of the light source unit 1 and the light receiving unit 2. The first positioning portion 312 is coupled to the second moving portion 32, which is a portion other than the first moving portion 31, via the first elongated hole 311. The first positioning portion 312 fixes the first movable member 381 to the second moving portion 32, thereby positioning the light source unit 1 and the light receiving unit 2, which are supported by the support portion 6 connected to the first movable member 381. In the example shown in FIG. 3 , a portion of the first positioning portion 312 is inserted into the first elongated hole 311, so that the first positioning portion 312 guides the movement of the first movable member 381 and also fixes the first movable member 381 by pressing.

[0032] The second moving unit 32 includes a second movable member 382 connected to the support unit 6. The second movable member 382 is provided with a second elongated hole 321 extending in the second direction Y. The second elongated hole 321 corresponds to a hole whose longitudinal direction is the direction of translation of the light source unit 1 and the light receiving unit 2. The direction of movement in the second elongated hole 321 is the second direction Y. A part of a second positioning unit 322 is inserted into the second elongated hole 321. The second moving unit 32 is a slider mechanism that uses the second elongated hole 321 to move the second movable member 382 in the second direction Y.

[0033] The second positioning portion 322 corresponds to the positioning portion of the light source unit 1 and the light receiving unit 2. The second positioning portion 322 is coupled to the support portion 6, which is a portion other than the second moving portion 32, via the second elongated hole 321. The second positioning portion 322 fixes the second movable member 382 to the support portion 6, thereby positioning the light source unit 1 and the light receiving unit 2, which are supported by the support portion 6 connected to the second movable member 382. In the example shown in FIG. 3 , a portion of the second positioning portion 322 is inserted into the second elongated hole 321, so that the second positioning portion 322 guides the movement of the second movable member 382 and also fixes the second movable member 382 by pressing.

[0034] The third moving unit 33 includes a third movable member 383 connected to the support unit 6. The third movable member 383 is provided with a third elongated hole 331 extending in the third direction Z. The third elongated hole 331 corresponds to a hole whose longitudinal direction is the direction of translation of the light source unit 1 and the light receiving unit 2. The movement direction of the third elongated hole 331 is the third direction Z. A part of a third positioning unit 332 is inserted into the third elongated hole 331. The third moving unit 33 is a slider mechanism that uses the third elongated hole 331 to move the third movable member 383 in the third direction Z.

[0035] The third positioning portion 332 corresponds to the positioning portions of the light source unit 1 and the light receiving unit 2. The third positioning portion 332 is coupled to the connection portion 5, which is a portion other than the third moving portion 33, via the third elongated hole 331. The third positioning portion 332 fixes the third movable member 383 to the connection portion 5, thereby positioning the light source unit 1 and the light receiving unit 2, which are supported by the support portion 6 connected to the third movable member 383. In the example shown in FIG. 3 , the third positioning portion 332 guides the movement of the third movable member 383 and fixes the third movable member 383 by pressing it, as a portion of the third positioning portion 332 is inserted into the third elongated hole 331.

[0036] It should be noted that movable member 38 is a collective notation for first movable member 381, second movable member 382, ​​and third movable member 383. In Fig. 3, the reference numeral for movable member 38 is written alongside the reference numerals for first movable member 381, second movable member 382, ​​and third movable member 383. In the drawings shown below, the reference numerals may also be written alongside each other to indicate that the notation is a collective notation.

[0037] The first moving unit 31, the second moving unit 32, and the third moving unit 33 are each directly or indirectly connected to the connecting unit 5 and the supporting unit 6, respectively. In the example shown in FIG. 3 , the third movable member 383 of the third moving unit 33 is connected to the connecting unit 5. The first moving unit 31 is connected to the connecting unit 5 via the third moving unit 33. The second moving unit 32 is connected to the connecting unit 5 via the first moving unit 31 and the third moving unit 33. In addition, the second movable member 382 of the second moving unit 32 is connected to the supporting unit 6. The first moving unit 31 is connected to the supporting unit 6 via the second moving unit 32. The third moving unit 33 is connected to the supporting unit 6 via the first moving unit 31 and the second moving unit 32.

[0038] The light source unit 1 and the light receiving unit 2 supported by the support unit 6 are translated relative to the connection unit 5 in a first direction X, a second direction Y, and a third direction Z that are perpendicular to each other, by a first moving unit 31, a second moving unit 32, and a third moving unit 33. The light source unit 1 and the light receiving unit 2 are translated relative to the wearer 300 to which the connection unit 5 is connected in the first direction X, the second direction Y, and the third direction Z. This makes it possible to three-dimensionally adjust the relative positions of the light source unit 1 and the light receiving unit 2 with respect to the wearer 300 so that at least a portion of the light Lo reflected by the eyeball 50 is incident on the light receiving unit 2.

[0039] The wearer 300 can move the light source unit 1 and the light receiving unit 2 relative to the wearer 300, for example, by manually operating the first moving unit 31, the second moving unit 32, and the third moving unit 33. Furthermore, the wearer 300 can adjust the relative positions of the light source unit 1 and the light receiving unit 2 with respect to the wearer 300, for example, by monitoring the light receiving signal from the light receiving unit 2 using a monitoring circuit or the like, so that at least a portion of the light Lo reflected by the eyeball 50 is incident on the light receiving unit 2. However, the position detection device 100 may also make adjustments using information other than the light receiving signal from the light receiving unit 2, so that at least a portion of the light Lo reflected by the eyeball 50 is incident on the light receiving unit 2.

[0040] Each component of the position detection device 100 will be described in detail below.

[0041] (Light source part 1) The light source unit 1 includes, for example, a VCSEL (Vertical Cavity Surface Emitting Laser). The VCSEL has a plurality of light-emitting elements arranged two-dimensionally within a plane. Each light-emitting element emits laser light having directivity and a finite spread angle. The emission and non-emission of laser light from each light-emitting element is individually controlled. The light source unit 1 is mounted on a mounting substrate and placed on a support unit 6.

[0042] The light source unit 1 is not limited to a VCSEL. The light source unit 1 may use a plurality of LDs (semiconductor lasers: laser diodes) or LEDs (light emitting diodes: light emitting diodes) that emit laser beams arranged two-dimensionally in a plane. The light source unit 1 may also use a pulsed laser that emits pulsed laser beams. Furthermore, the light source unit 1 may use a combination of a plurality of types of light sources.

[0043] The light emitted from the light source unit 1 is preferably invisible light such as near-infrared light so as not to obstruct the field of vision of the wearer 300. However, the light emitted from the light source unit 1 is not limited to invisible light and may be visible light.

[0044] (Light receiving part 2) The light receiving unit 2 includes, for example, a PSD (Position Sensitive Detector). The PSD is a two-dimensional light position sensitive detector that detects a current value corresponding to the distance of incident light to an electrode in two orthogonal directions within the light receiving surface, and calculates and outputs a detection signal indicating the position of the incident light from the ratio of the current values ​​in the two orthogonal directions. The PSD outputs a detection signal indicating the position of a light spot formed on the light receiving surface of the PSD.

[0045] A PSD has four output terminals. A PSD has a resistive film arranged on a continuous light-receiving surface (a light-receiving surface not divided into pixels), and electrode pairs arranged in two orthogonal directions. The photocurrent generated at the light spot position is divided into four parts according to the distance to each output terminal. At this time, the electrical resistance of the resistive film acts so that the current decreases as the distance between the light spot position and the output terminal increases. The PSD detects the electrical signal that passes through the resistive film via the four terminals and outputs a detection signal that indicates the position within the light-receiving surface, obtained through electrical post-processing. The PSD can convert the current generated by photoelectric conversion into an analog voltage signal and output it as a detection signal from the four terminals. In other words, a PSD can detect the position of incidence by using the surface resistance to determine the distance from each terminal.

[0046] The light receiving unit 2 is not limited to a PSD and may include an image sensor (image pickup element) as a position detection means. However, if the light receiving unit 2 includes an image sensor, the output result of the image sensor varies depending on the intensity of light incident on each pixel, and low intensity results in low output current. To reduce the effects of noise light such as sunlight, it is necessary to increase the output of the light source to increase the intensity of light incident on the image sensor. Furthermore, in the case of an image sensor, image processing is required for position detection. This may result in errors in position accuracy during processing and increase the processing load. Therefore, from the perspective of increasing safety for the eyeball 50 and reducing the processing load, it is preferable that the light receiving unit 2 include a PSD as a position detection means.

[0047] By using a PSD as the light receiving unit 2, the position is detected using the current division ratio (proportion) divided between the output terminals, so the position of the incident light can be detected regardless of the intensity of the incident light. This increases safety for the eye 50. Furthermore, since image processing is not required, processing is simplified and the processing load is reduced. However, the light receiving unit 2 is not limited to a PSD and may have other configurations. Furthermore, the PSD is not limited to a two-dimensional PSD that detects two-dimensional positions within the light receiving surface, but may be a one-dimensional PSD that detects one-dimensional positions within the light receiving surface. The light receiving unit 2 is mounted on a mounting board and placed on the support unit 6. The light source unit 1 and the light receiving unit 2 may be mounted on the same mounting board.

[0048] (Mobile part 3) The moving part 3 is a sliding mechanism that utilizes a slot. The sliding part of the slider mechanism can also use a component that changes the sliding load. To reduce the sliding load, a material with a low coefficient of friction can be used for the sliding part. This reduces the sliding load and allows the movable member 38 to move smoothly. Examples of materials with a low coefficient of friction include polyoxymethylene resin (POM) and Teflon (registered trademark). To increase the sliding load, a material with a high coefficient of friction can be used for the sliding part. This increases the sliding load and reduces relative positional deviation after adjusting the position of the movable member 38. Examples of materials with a high coefficient of friction include thermoplastic polyurethane elastomer resin (TPU) and rubber. To achieve a desired sliding load, a material with a low coefficient of friction and desired elasticity can be used for the sliding part. This allows the movable member 38 to move smoothly and reduces relative positional deviation after adjustment. Examples of materials with a desired elasticity include felt.

[0049] The moving unit 3 is not limited to a slide mechanism using a slot, but may include a linear stage or the like. Furthermore, the driving of the light source unit 1 and the light receiving unit 2 by the moving unit 3 is not limited to manual. The moving unit 3 may be provided with a driving unit such as a motor or a piezoelectric actuator and may be driven electrically.

[0050] The first positioning portion 312, the second positioning portion 322, and the third positioning portion 332 may each be formed using a fixing screw member, a lock lever mechanism, or the like.

[0051] (Light deflection section 4) The light deflection unit 4 can be, for example, a concave mirror. The concave mirror is a focusing reflecting member that has a concave reflecting surface with a curvature, reflects incident light Li1, and irradiates the eyeball 50 with focused light Li2. The light Li2 is incident near the pupil of the eyeball 50. The center of curvature of the concave surface of the concave mirror is located off the optical axis of the optical path from the light source unit 1 to the light deflection unit 4. The optical system including the light source unit 1, the light receiving unit 2, and the light deflection unit 4 constitutes an off-axis optical system. An off-axis optical system is one that has a structure in which an axis of rotational symmetry exists in a space external to the optical system.

[0052] The light deflection unit 4 is not limited to a concave mirror, but may be a plane mirror, a combination of a convex lens and a plane mirror, a wavefront control element using a hologram, a diffractive optical element, etc. Furthermore, if an anamorphic aspherical surface with different curvatures in two orthogonal directions in a plane intersecting the optical axis of the focused laser light is used as the concave surface of the concave mirror, the diameter of the light beam can be further reduced and the light can be shaped into an isotropic state.

[0053] (Connection 5) The connection unit 5 is a portion that connects to the wearer 300. In the example shown in this specification, the connection unit 5 connects to the head mounted display 200 worn by the wearer 300, thereby connecting to the wearer 300. The position where the connection unit 5 connects to the head mounted display 200 can be changed as appropriate depending on the shape of the head mounted display 200, etc. The shape of the connection unit 5 can be changed as appropriate depending on the position where the connection unit 5 connects to the head mounted display 200, etc. The connection unit 5 can be made of a material that includes a resin material, a metal material, etc.

[0054] (Support part 6) The support unit 6 is a part that supports the light source unit 1 and the light receiving unit 2. In the example shown in this specification, the support unit 6 is connected to the moving unit 3, and the relative position of the support unit 6 with respect to the wearer 300 is changed by the moving unit 3. As the relative position of the support unit 6 with respect to the wearer 300 changes, the positions of the light source unit 1 and the light receiving unit 2 with respect to the wearer 300 change. The shape of the support unit 6 can be changed as appropriate depending on the positions or shapes of the light source unit 1, the light receiving unit 2, and the optical deflection unit 4 that are supported, or the configuration or shape of the moving unit 3. The support unit 6 can be made of a material that includes a resin material, a metal material, or the like.

[0055] (Other components) In addition to the above components, the position detection device 100 may have a processing unit etc. The processing unit outputs a control signal to drive the VCSEL to emit light, and receives a detection signal from the light receiving unit 2 to execute processing to detect the position of the pupil P of the eyeball 50. The processing unit is disposed on the support unit 6 etc.

[0056] The position of the light Lo incident on the light receiving unit 2 changes depending on the tilt of the eyeball 50. The processing unit converts the detection signal of the light receiving unit 2 into coordinate information, thereby detecting the position of the pupil P of the eyeball 50. The light receiving unit 2 can detect the position of the reflection point on the eyeball 50 and the direction of the normal vector. The position detection device 100 can estimate the pupil position based on the correspondence between the detected positions of the reflection points, the normal vectors, and the surface shape model of the eyeball.

[0057] <Operation of the position detection device 100 according to the first embodiment of the present invention> The operation of the position detection device 100 according to the first embodiment of the present invention will be described with reference to Figures 8 and 9. Figure 8 is a first schematic top view showing the operation of the position detection device 100 according to the first embodiment of the present invention. Figure 9 is a second schematic top view showing the operation of the position detection device 100 according to the first embodiment of the present invention.

[0058] When the head-mounted display 200 connected to the position detection device 100 is worn by the wearer 300, the light source unit 1, the light receiving unit 2, the moving unit 3, and the light deflection unit 4 are positioned close to (in front of) the eyeball 50 of the wearer 300.

[0059] In the off-axis optical system of the position detection device 100, light Lo before reaching the eyeball 50 propagates through the space in front of the eye adjacent to the eyeball 50, turning back at least once, without being reflected or scattered by the eyeball 50, before reaching the eyeball 50. In the example shown in FIGS. 8 and 9 , light Li1 emitted from the light source unit 1 propagates through the space in front of the eye toward the optical deflection unit 4 in a direction substantially parallel to the face of the wearer 300 wearing the head-mounted display 200. The light Li1 is divergent light that propagates while widening the diameter of the light beam due to diffraction at the opening of the exit unit of the light source unit 1. The divergence angle of the divergent light can be controlled by the shape of the opening of the exit unit. The light Li1 propagates while diverging, and enters the optical deflection unit 4.

[0060] The light deflection unit 4 reflects the incident light Li1 and irradiates the eyeball 50 with light Li2, which is a focused light. The angle of incidence of the light Li2 on the eyeball 50 is adjusted so that it is incident at a predetermined angle on the center of the pupil of the eyeball 50 when the eye is looking straight ahead. Note that looking straight ahead means directing the line of sight in a direction along the Z axis, for example. The light source unit 1 can emit light Li1 from multiple light-emitting units. The laser light emitted from the multiple light-emitting units is irradiated onto multiple locations on the eyeball 50, or is irradiated onto the eyeball 50 at multiple angles.

[0061] The pupil surface (corneal surface) of the eyeball 50 is a transparent body containing water and generally has a reflectance of approximately 2 to 4%. Light Li1 incident near the pupil of the eyeball 50 is reflected by the surface of the pupil of the eyeball 50, and the reflected light Li2 propagates toward the light receiving unit 2. The curvature of the reflecting surface of the light deflection unit 4 is determined so as to offset the divergence of light Lo reflected by the curvature of the eyeball or cornea. This prevents the diameter of the beam of light Lo propagating toward the light receiving unit 2 from widening on the light receiving surface of the light receiving unit 2.

[0062] The light source unit 1 has multiple light-emitting units and is capable of high-speed modulation. By time-modulating the laser light irradiated onto the eyeball 50 and extracting from the output signal of the light-receiving unit 2 a component having a modulation frequency that matches the laser light incident on the light-receiving unit 2, it is possible to eliminate the influence of light from the external environment that does not involve modulation. As a result, the signal-to-noise ratio can be improved, which is advantageous for pupil position detection in bright environments. It is also possible to reduce the amount of laser light irradiated onto the eyeball 50.

[0063] FIG. 8 shows a state in which the wearer 300 is looking straight ahead. The light source unit 1 emits light Li1 from one of the multiple light-emitting units. The light deflection unit 4 reflects the light Li1 toward the eyeball 50. Light Li2, which is light Li1 reflected by the light deflection unit 4, enters the eyeball 50. The eyeball 50 reflects the light Li2. Light Lo, which is light Li2 reflected by the eyeball 50, enters the light receiving unit 2. Note that in FIG. 8, a portion of each of the light Li1, light Li2, and light Lo is represented by a solid arrow. This is also true in FIG. 9.

[0064] In the example shown in Figure 8, the light source unit 1 emits light Li1' from another light-emitting unit among the multiple light-emitting units. The light deflection unit 4 reflects light Li1' toward the eyeball 50. Light Li2', which is light reflected from the light deflection unit 4 of light Li1', enters the eyeball 50. The eyeball 50 reflects light Li2'. Light Lo', which is light reflected from the eyeball 50 of light Li2', does not enter the light receiving unit 2. Note that in Figure 8, parts of light Li1', light Li2', and light Lo' are represented by dashed arrows. This is also true in Figure 9.

[0065] 8, the light Lo is incident on the light receiving unit 2, and the light Lo' is not incident on the light receiving unit 2. The position detection device 100 can detect the position of the pupil P of the eyeball 50 using the light receiving signal of the light Lo received by the light receiving unit 2.

[0066] 9 shows a state in which the eyeball 50 is tilted relative to the eyeball 50 in the example of FIG. 8 as a result of the wearer 300 slightly moving his or her line of sight from the normal viewing state. Light Lo derived from light Li1 from one of the plurality of light-emitting units does not enter the light-receiving unit 2. Light Lo' derived from light Li1' from another of the plurality of light-emitting units enters the light-receiving unit 2. The position detection device 100 can detect the position of the pupil P of the eyeball 50 using the light-receiving unit 2's light-receiving signal of light Lo.

[0067] In the position detection device 100, for example, among the multiple light-emitting units, the light-emitting unit that emits light is switched sequentially. As a result, even if the eyeball 50 moves in response to a change in the line of sight of the wearer 300 or the like, at least one of the light beams Lo derived from the light beams Li1 emitted from the multiple light-emitting units is incident on the light-receiving unit 2. As a result, even if the eyeball 50 moves in response to a change in the line of sight of the wearer 300 or the like, the position detection device 100 can receive the light beam Lo at the light-receiving unit 2 and detect the position of the pupil P of the eyeball 50 based on the light-receiving signal of the light-receiving unit 2.

[0068] From another perspective, the position detection device 100 reduces the number of times that the laser light reflected by the eyeball 50 does not enter the light receiving unit 2 even when the eyeball 50 rotates, thereby expanding the range over which the position of the pupil P can be detected. The light receiving unit 2 detects slight movements of the laser light based on the rotational movement of the eyeball 50, and the arrangement of multiple light emitting units in the light source unit 1 detects coarse movements of the laser light based on the rotational movement of the eyeball 50, making it possible to achieve both high detection resolution and a wide detection range in detecting the rotation angle of the rotational movement of the eyeball 50.

[0069] The light-emitting units in the light source unit 1 can be switched in time series by a drive signal from the processing unit in accordance with the movement of the eyeball 50. Furthermore, controlling the light-emitting units in accordance with the rotational movement of the eyeball 50 improves the efficiency of light use and shortens the estimation time. However, it is not necessarily necessary to switch the light-emitting units of the light source unit 1 in accordance with the rotational movement of the eyeball 50. For example, the position detection device 100 may raster scan (sequentially emit light) the light-emitting units of the light source unit 1 at predetermined time intervals independent of the eyeball movement, and detect the coarse movement position of the eyeball 50 based on the detection signal of the light-receiving unit 2 at that time.

[0070] [Second embodiment] Next, a position detection device according to a second embodiment of the present invention will be described. Note that the same names and symbols as those in the previously described embodiments indicate the same or similar components or configurations, and detailed descriptions will be omitted as appropriate. This also applies to the following embodiments.

[0071] The configuration of a position detection device according to a second embodiment of the present invention will be described with reference to FIGS. 10 to 14. FIG. 10 is a schematic perspective view of the position detection device 100a according to the second embodiment of the present invention, viewed from the -Y side, showing a state in which the position detection device 100a according to the second embodiment of the present invention is arranged on a head-mounted display 200. FIG. 11 is a schematic top view showing the overall configuration of the position detection device 100a according to the second embodiment of the present invention. FIG. 12 is a schematic front view showing the overall configuration of the position detection device 100a according to the second embodiment of the present invention. FIG. 13 is a schematic side view showing the overall configuration of the position detection device 100a according to the second embodiment of the present invention. FIG. 14 is a schematic perspective view of the position detection device 100a according to the second embodiment of the present invention, viewed from the +Y side, showing the overall configuration of the position detection device 100a.

[0072] In the position detection device 100a, the moving unit 3 includes a movable member 38 connected to the support unit 6, a feed screw member 34 connected to the movable member 38, and a conversion unit 35 coupled to the feed screw member 34 to convert the rotational motion of the feed screw member 34 into linear motion of the feed screw member 34. This point differs from the position detection device 100a according to the first embodiment of the present invention.

[0073] The moving section 3 includes a first moving section 31, a second moving section 32, and a third moving section 33. The first moving section 31 includes a first feed screw member 341 that is the feed screw member 34 of the first moving section 31, and a first conversion section 351 that is the conversion section 35 of the first moving section 31. The second moving section 32 includes a second feed screw member 342 that is the feed screw member 34 of the second moving section 32, and a second conversion section 352 that is the conversion section 35 of the second moving section 32. The third moving section 33 includes a third feed screw member 343 that is the feed screw member 34 of the third moving section 33, and a third conversion section 353 that is the conversion section 35 of the third moving section 33.

[0074] The first lead screw member 341 includes a first screw head 341a and a first screw portion 341b. The first movable member 381 includes a first abutment portion 361 that abuts against the first screw head 341a of the first lead screw member 341. The first screw head 341a of the first lead screw member 341 presses the abutment portion 361 in the first direction X due to the linear motion of the first lead screw member 341.

[0075] The first contact portions 361 are arranged on both sides of the first screw head 341a of the first feed screw member 341 in the first direction X. The first threaded portion 341b of the first feed screw member 341 penetrates a portion of the first contact portion 361. The first contact portion 361 is provided with a first open portion 371 (see FIG. 11) around the first threaded portion 341b penetrating the first contact portion 361, where a portion of the first contact portion 361 is opened. The first open portion 371 is provided only on the first contact portion 361 on the +X side, out of the first contact portions 361 arranged on both sides of the first screw head 341a.

[0076] The second lead screw member 342 includes a second screw head 342a and a second screw portion 342b. The second movable member 382 includes a second abutment portion 362 that abuts against the second screw head 342a of the second lead screw member 342. The second screw head 342a of the second lead screw member 342 presses the second abutment portion 362 in the second direction Y due to the linear motion of the second lead screw member 342.

[0077] The second contact portions 362 are arranged on both sides of the second screw head 342a of the second feed screw member 342 in the second direction Y. The second screw portion 342b of the second feed screw member 342 penetrates a portion of the second contact portion 362. The second contact portion 362 is provided with a second open portion 372 (see FIG. 14 ) around the second screw portion 342b penetrating the second contact portion 362, where a portion of the second contact portion 362 is opened. The second open portion 372 is provided only on the second contact portion 362 on the +Y side, out of the second contact portions 362 arranged on both sides of the second screw head 342a.

[0078] The third feed screw member 343 includes a third screw head 343a and a third screw portion 343b. The third movable member 383 includes a third abutment portion 363 that abuts against the third screw head 343a of the third feed screw member 343. The third screw head 343a of the third feed screw member 343 presses the third abutment portion 363 in the third direction Z due to the linear motion of the third feed screw member 343.

[0079] The third contact portions 363 are arranged on both sides of the third screw head 343a of the third feed screw member 343 in the third direction Z. The third screw portion 343b of the third feed screw member 343 penetrates a portion of the third contact portion 363. The third contact portion 363 is provided with a third open portion 373 (see FIG. 14 ) around the third screw portion 343b penetrating the third contact portion 363, where a portion of the third contact portion 363 is opened. The third open portion 373 is provided only on the third contact portion 363 on the +X side, out of the third contact portions 363 arranged on both sides of the third screw head 343a.

[0080] The feed screw member 34 is a collective term for the first feed screw member 341, the second feed screw member 342, and the third feed screw member 343. The conversion portion 35 is a collective term for the first conversion portion 351, the second conversion portion 352, and the third conversion portion 353. The abutment portion 36 is a collective term for the first abutment portion 361, the second abutment portion 362, and the third abutment portion 363. The open portion 37 is a collective term for the first open portion 371, the second open portion 372, and the third open portion 373.

[0081] In the position detection device 100a, by converting the rotational motion of the feed screw member 34 into linear motion, the resolution of the translational movement of the light source unit 1 and the light receiving unit 2 by the moving unit 3 increases according to the thread pitch of the feed screw member 34. The shorter the thread pitch of the feed screw member 34, the higher the resolution of the translational movement of the light source unit 1 and the light receiving unit 2 by the moving unit 3 increases.

[0082] In the position detection device 100a, the linear motion of the feed screw member 34 causes the screw head of the feed screw member 34 to press the abutment portion 36 in the movement direction of the light source unit 1 and the light receiving unit 2. This causes the movable member 38 including the abutment portion 36 to move linearly in the movement direction of the light source unit 1 and the light receiving unit 2. The position detection device 100a can translate the light source unit 1 and the light receiving unit 2, which are supported by the support portion 6 to which the movable member 38 is connected.

[0083] In the position detection device 100a, the abutment portions 36 are arranged on both sides of the screw head of the feed screw member 34 in the movement direction of the light source unit 1 and the light receiving unit 2. This allows the screw head of the feed screw member 34 to press the abutment portions 36 in both directions in the movement direction of the light source unit 1 and the light receiving unit 2. As a result, in the position detection device 100a, the light source unit 1 and the light receiving unit 2 can move translationally in both directions in the movement direction of the light source unit 1 and the light receiving unit 2.

[0084] In the position detection device 100a, an open portion 37 is provided around the threaded portion of the lead screw member 34 in the abutment portion 36. This allows the lead screw member 34 to be placed on the abutment portion 36 through the open portion 37. As a result, the lead screw member 34 can be placed on the abutment portion 36 so that the screw head of the lead screw member 34 can press the abutment portion 36 by linear motion of the lead screw member 34. In addition, since it is possible to insert a work tool such as a wrench or a screwdriver into the open portion 37 and perform operations such as rotating the screw head of the lead screw member 34, the options for adjusting the position of the movable member 38 can be increased.

[0085] 13, in the position detection device 100a, the first distance d1 is longer than the second distance d2. The first distance d1 is the distance from the central axis 343C of the third screw portion 343b along the third direction Z to the outer edge of the third screw head 343a of the third lead screw member 343. The second distance d2 is the distance from the central axis 343C to the outer edge of the third abutment portion 363. The third direction Z is the direction in which the third screw portion 343b of the third lead screw member 343 extends.

[0086] Because the first distance d1 is longer than the second distance d2, for example, the wearer 300 can touch the outer edge of the third screw head 343a with his or her finger and apply an external force to the outer edge of the third screw head 343a, thereby rotating the third lead screw member 343 around the central axis 343C. The rotation of the third lead screw member 343 is converted into linear motion. The linear motion of the third lead screw member 343 causes the light source unit 1 and the light receiving unit 2 to move translationally. Note that while FIG. 13 illustrates the third lead screw member 343 and the third abutment portion 363, a similar configuration can also be employed for the first lead screw member 341 and the first abutment portion 361. A similar configuration can also be employed for the second lead screw member 342 and the second abutment portion 362.

[0087] The moving unit 3 may use a moving mechanism other than the configuration using the feed screw member 34 and the conversion unit 35. Examples of the moving mechanism other than the configuration using the feed screw member 34 and the conversion unit 35 include a rack and pinion mechanism.

[0088] The position detection device 100a according to the second embodiment of the present invention has the same effects as the position detection device 100 according to the first embodiment of the present invention, except for the effects described above.

[0089] [Third embodiment] Next, a position detection device according to a third embodiment of the present invention will be described. Fig. 15 is a schematic side view showing the first mark M1 and the second mark M2 in the position detection device according to the third embodiment of the present invention. Fig. 15 shows an enlarged view of the third feed screw member 343, the third conversion member 353, and the third abutment member 363 in a state in which the third feed screw member 343 of the third moving unit 33 is coupled to the third conversion member 353.

[0090] In the position detection device according to the third embodiment of the present invention, a first mark M1 is provided on the third conversion unit 353. A second mark M2 is provided on the third movable member 383 so as to be parallel to the first mark M1 in the second direction Y that intersects with the third direction Z in which the light source unit 1 and the light receiving unit 2 move translationally when the third feed screw member 343 is coupled to the third conversion unit 353. The above points are different from the position detection device 100 according to the first embodiment of the present invention.

[0091] The first mark M1 and the second mark M2 can be formed by embossing, printing, or a sticker. In the example shown in FIG. 15, the first mark M1 is a mark consisting of a substantially isosceles triangle with vertex M10 located on the -Y side. The second mark M2 is located on the -Y side of the first mark M1 and consists of six rectangles and one triangle aligned in the third direction Z. The third conversion part 353 is connected to the connection part 5 and does not move even when the third feed screw member 343 rotates. Meanwhile, the third movable member 383 moves in the third direction Z as the rotation of the third feed screw member 343 is converted into linear motion by the third conversion part 353.

[0092] For example, an adjuster who manually rotates the third feed screw member 343 can adjust the relative position of the third movable member 383 to the third conversion unit 353 in the third direction Z using the relative position of the first mark M1 to the second mark M2 as an index. This allows the adjuster to adjust the relative positions of the light source unit 1 and the light receiving unit 2 supported by the support unit 6 connected to the third movable member 383 to the wearer 300 wearing the head-mounted display 200. Using the relative positions of the second mark M2 and the first mark M1 as an index allows the adjustment to be performed easily and with high precision.

[0093] The phrase "the second mark M2 is arranged parallel to the first mark M1 in a direction intersecting the translational movement direction of the light source unit 1 and the light-receiving unit 2" means that the entire width of the second mark M2 is contained within the entire width of the first mark M1 in the translational movement direction of the light source unit 1 and the light-receiving unit 2, or the entire width of the first mark M1 is contained within the entire width of the second mark M2. In the example shown in FIG. 15, the second width W2 of the entire second mark M2 in the third direction Z is larger than the first width W1 of the entire first mark M1. In the third direction Z, the first width W1 of the entire first mark M1 is contained within the second width W2 of the entire second mark M2. Therefore, the second mark M2 shown in FIG. 15 is arranged parallel to the first mark M1 in the second direction Y intersecting the third direction Z in which the light source unit 1 and the light-receiving unit 2 translate.

[0094] 15 illustrates an adjustment method using the third moving unit 33, but similar adjustments can be made using the first mark M1 and the second mark M2 in the first moving unit 31 and the second moving unit 32. The direction in which the light source unit 1 and the light receiving unit 2 translate is not limited to the third direction Z, but may be the first direction X or the second direction Y. The direction in which the light source unit 1 and the light receiving unit 2 translate, intersecting with the third direction Z, is not limited to the second direction Y, but may be the first direction X. The shape, number, and formation position of the figures of the first mark M1 and the second mark M2 can also be changed as appropriate.

[0095] The position detection device according to the third embodiment of the present invention has the same effects as the position detection device 100 according to the first embodiment of the present invention, except for the effects described above.

[0096] Although the preferred embodiments have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments of the present invention without departing from the scope of the claims.

[0097] All ordinal numbers, quantitative numbers, and other figures used in the description of the embodiments of the present invention are provided as examples to specifically explain the technology of the present invention, and the present invention is not limited to the illustrated figures. Furthermore, the connection relationships between components are provided as examples to specifically explain the technology of the present invention, and do not limit the connection relationships that realize the functions of the present invention.

[0098] For example, aspects of the present invention are as follows. <1> A pupil or cornea position detection device provided on a mounting part worn by a wearer, the device having a light source part, a light receiving part that receives at least a portion of the light emitted from the light source part and reflected by the eyeball of the wearer, and a moving part that moves the light source part and the light receiving part in a translational manner, the moving part changing the relative positions of the light source part and the light receiving part with respect to the mounting part. <2> the moving unit includes a first moving unit that moves the light source unit and the light receiving unit in a translational manner in a first direction, a second moving unit that moves the light source unit and the light receiving unit in a translational manner in a second direction, and a third moving unit that moves the light source unit and the light receiving unit in a translational manner in a third direction, and the first direction, the second direction, and the third direction are orthogonal to one another. <1> 1. A pupil or cornea position detection device according to claim 1. <3> the pupil or cornea position detection device further includes a light deflection unit that is disposed in an optical path between the light source unit and the eyeball when the pupil or cornea position detection device is worn by the wearer, and that deflects the light emitted from the light source unit in a direction where the eyeball is located, the light receiving unit receives at least a part of the light that is deflected by the light deflection unit and then reflected by the eyeball, and the moving unit moves the light source unit, the light receiving unit, and the light deflection unit in a translational manner; <1> or the above <2> 1. A pupil or cornea position detection device according to claim 1. <4> a connecting portion connected to the mounting portion and a supporting portion supporting the light source portion and the light receiving portion, and the moving portion is connected to the supporting portion and changes the relative position of the supporting portion with respect to the connecting portion; <1> From the above <3> The pupil or cornea position detection device is described in any one of the above. <5> The moving unit includes a positioning unit that positions the light source unit and the light receiving unit relative to the mounting unit, and the moving unit is provided with a long hole whose longitudinal direction is the moving direction in which the light source unit and the light receiving unit move translationally, and the positioning unit is coupled to a member or part other than the moving unit in which the long hole is provided via the long hole, and positions the light source unit and the light receiving unit by fixing the moving unit in which the long hole is provided to a member or part other than the moving unit in which the long hole is provided. <1> From the above <4> The pupil or cornea position detection device is described in any one of the above. <6> the moving unit includes a movable member connected to the support unit, a feed screw member connected to the movable member, and a conversion unit coupled to the feed screw member to convert the rotational motion of the feed screw member into the linear motion of the feed screw member. <4> 1. A pupil or cornea position detection device according to claim 1. <7> the feed screw member includes a screw head and a threaded portion, the movable member includes a contact portion with which the screw head of the feed screw member contacts, and the screw head of the feed screw member presses the contact portion in the moving direction of the light source unit and the light receiving unit by linear motion of the feed screw member; <6> 1. A pupil or cornea position detection device according to claim 1. <8> the abutting portions are disposed on both sides of the screw head of the feed screw member in the direction of movement of the light source unit and the light receiving unit by the moving portion; <7> 1. A pupil or cornea position detection device according to claim 1. <9> The threaded portion of the feed screw member penetrates a part of the abutting portion, and the abutting portion is provided with an open portion around the threaded portion that penetrates the abutting portion, where the abutting portion is open. <7> or the above <8> 1. A pupil or cornea position detection device according to claim 1. <10> a first distance from a central axis of the screw portion along an extending direction of the screw portion to an outer edge of the screw head of the feed screw member is longer than a second distance from the central axis of the screw portion to an outer edge of the abutting portion; <7> From the above <9> The pupil or cornea position detection device is described in any one of the above. <11> a first mark is provided on the conversion unit, and a second mark is provided on the movable member so as to be aligned with the first mark in a direction intersecting a direction of translational movement of the light source unit and the light receiving unit when the feed screw member is coupled to the conversion unit; <6> From the above <10> The pupil or cornea position detection device is described in any one of the above. <12> the light source unit includes a vertical cavity surface emitting laser; <1> From the above <11> 10. A pupil or cornea position detection device according to any one of the preceding claims. <13> The aforementioned <1> From the above <12> A head-mounted display having the pupil or cornea position detection device described in any one of the above. <14> When the head-mounted display is worn by the wearer, the pupil or cornea position detection device is disposed on the opposite side of the display unit for the other eye, with respect to either the display unit for the right eye or the display unit for the left eye of the wearer. <13> 2. The head-mounted display according to claim 1, <15> a pupil or cornea position detection device for the wearer's right eye and a pupil or cornea position detection device for the wearer's left eye, wherein when the head mounted display is worn by the wearer, the pupil or cornea position detection device for the right eye is disposed on the opposite side of a display unit with the wearer's right eye as a reference, and the pupil or cornea position detection device for the left eye is disposed on the opposite side of the display unit with the wearer's left eye as a reference, <13> or the above <14> 2. The head-mounted display according to claim 1, [Explanation of symbols]

[0099] 1 Light source section 2 Light receiving section 3. Moving Part 31 First Mobile Section 311 1st long hole 312 First positioning part 32 Second Mobile Section 321 2nd long hole 322 Second positioning part 33 Third Mobile Section 331 3rd long hole 332 Third positioning part 34 Lead screw member 341 First feed screw member 341a First screw head 341b First screw part 342 Second feed screw member 342a Second screw head 342b Second screw part 343 Third feed screw member 343a 3rd screw head 343b Third screw part 35 Conversion unit 351 First Conversion Unit 352 Second Conversion Unit 353 Third Conversion Unit 36 Contact part 361 1st contact part 362 Second contact part 363 Third contact part 37 Open area 371 1st open section 372 2nd open section 373 Third opening 38 Movable parts 381 First Movable Member 382 Second movable member 383 Third Movable Member 4 Light deflection section 5 Connection 6 Support part 61 Aperture 50 Eyeball 100, 100a Position detection device 200 Head-Mounted Display 201 Mounting part 202 Display section 202a Right eye display 202b Left eye display 203 Holding part 300 wearers 300H head 300N nose d1 First distance d2 2nd distance Li1, Li2, Lo, Li1', Li2', Lo' light M1 1st Mark M10 vertex M2 2nd Mark P pupil W1 1st width W2 Second width [Prior art documents] [Patent documents]

[0100] [Patent Document 1] US Patent Application Publication No. 2016 / 0166146

Claims

1. A pupil or cornea position detection device provided in a mounting part that is mounted on a wearer, A light source unit; a light receiving unit that receives at least a portion of light emitted from the light source unit and reflected by the eyeball of the wearer; a moving unit that translates the light source unit and the light receiving unit, The moving unit changes the relative positions of the light source unit and the light receiving unit with respect to the mounting unit.

2. The moving unit is a first moving unit that translates the light source unit and the light receiving unit in a first direction; a second moving unit that translates the light source unit and the light receiving unit in a second direction; a third moving unit that translates the light source unit and the light receiving unit in a third direction, The pupil or cornea position detection device according to claim 1 , wherein the first direction, the second direction, and the third direction are orthogonal to one another.

3. a light deflection unit that is disposed in an optical path between the light source unit and the eyeball when the pupil or cornea position detection device is worn by the wearer, and that deflects light emitted from the light source unit in a direction toward the eyeball, the light receiving unit receives at least a portion of the light that has been deflected by the light deflection unit and then reflected by the eyeball; The pupil or cornea position detection device according to claim 1 , wherein the moving unit translates the light source unit, the light receiving unit, and the light deflection unit.

4. a connection portion connected to the mounting portion; a support portion that supports the light source portion and the light receiving portion, The pupil or cornea position detection device according to claim 1 , wherein the moving portion is connected to the support portion and changes the relative position of the support portion with respect to the connecting portion.

5. the moving unit includes a positioning unit that determines relative positions of the light source unit and the light receiving unit with respect to the mounting unit, the moving unit is provided with a slot whose longitudinal direction is the direction of translation of the light source unit and the light receiving unit; 2. The pupil or cornea position detection device according to claim 1, wherein the positioning unit is coupled to a member or part other than the moving unit in which the long hole is provided via the long hole, and the light source unit and the light receiving unit are positioned by fixing the moving unit in which the long hole is provided to a member or part other than the moving unit in which the long hole is provided.

6. The moving unit is a movable member connected to the support; a feed screw member connected to the movable member; 5. The pupil or cornea position detection device according to claim 4, further comprising: a conversion unit coupled to the feed screw member to convert the rotational motion of the feed screw member into the linear motion of the feed screw member.

7. the lead screw member includes a screw head and a threaded portion; the movable member includes an abutment portion against which the screw head of the feed screw member abuts, 7. The pupil or cornea position detection device according to claim 6, wherein the screw head of the feed screw member presses the contact portion in the direction of movement of the light source unit and the light receiving unit by linear motion of the feed screw member.

8. 8. The pupil or cornea position detection device according to claim 7, wherein the contact portions are arranged on both sides of the screw head of the feed screw member in the direction of movement of the light source unit and the light receiving unit by the movement portion.

9. the threaded portion of the feed screw member penetrates a part of the abutment portion, The pupil or cornea position detection device according to claim 7 , wherein the contact portion is provided with an open portion around the screw portion that penetrates the contact portion, the open portion being a part of the contact portion that is open.

10. 8. The pupil or cornea position detection device according to claim 7, wherein a first distance from a central axis of the screw portion along the extension direction of the screw portion to an outer edge of the screw head of the feed screw member is longer than a second distance from the central axis of the screw portion to an outer edge of the abutment portion.

11. a first mark is provided on the conversion portion; 7. The pupil or cornea position detection device according to claim 6, wherein the movable member is provided with a second mark aligned with the first mark in a direction intersecting a direction of translational movement of the light source unit and the light receiving unit when the feed screw member is coupled to the conversion unit.

12. The pupil or cornea position detection device according to claim 1 , wherein the light source unit includes a vertical cavity surface emitting laser.

13. A head-mounted display comprising the pupil or cornea position detection device according to any one of claims 1 to 12.

14. When the head-mounted display is worn by the wearer, The head-mounted display according to claim 13, wherein the pupil or cornea position detection device is positioned on the opposite side of the display unit for the other eye, relative to either the display unit for the right eye or the display unit for the left eye of the wearer.

15. a pupil or cornea position detection device for the wearer's right eye; a pupil or cornea position detection device for the wearer's left eye, When the head-mounted display is worn by the wearer, the pupil or cornea position detection device for the right eye is disposed on the opposite side of the display unit with respect to the right eye of the wearer; The head mounted display according to claim 13 , wherein the pupil or cornea position detection device for the left eye is disposed on the opposite side of the display unit with respect to the left eye of the wearer.

Images