Tilt detection device, display apparatus, sight line depth position measurement apparatus, eye movement information output apparatus, and sight line direction tracking apparatus

Abstract

To downsize a device capable of detecting tilts of two objects respectively.SOLUTION: A tilt detection device comprises: a light source which includes a first light emitting unit and a second light emitting unit different from the first light emitting unit; a single light receiving unit that receives a first reflected light obtained by reflecting light emitted from the first light emitting unit by a first object, and a second reflected light obtained by reflecting light emitted from the second light emitting unit by a second object; and a processing unit that respectively outputs information on a tilt of the first object and a tilt of the second object on the basis of a result of light reception by the light receiving unit.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an inclination detection device, a display device, a line-of-sight depth position measurement device, an eye movement information output device, and a line-of-sight direction tracking device.

Background Art

[0002] An inclination detection device that detects the inclination of an object based on reflected light of light irradiated on the object is known.

[0003] For example, Patent Document 1 discloses a system that includes a plurality of illumination light sources and a plurality of cameras, irradiates light on an eye from the plurality of illumination light sources, and analyzes an image captured by the plurality of cameras to perform line-of-sight detection.

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present invention is to miniaturize a device capable of detecting the inclination of each of two objects.

Means for Solving the Problems

[0005] An inclination detection device according to an aspect of the present invention includes a light source including a first light emitting unit and a second light emitting unit different from the first light emitting unit, a first reflected light of light emitted from the first light emitting unit and reflected by a first object, and a second reflected light of light emitted from the second light emitting unit and reflected by a second object, and a processing unit that receives the first reflected light and the second reflected light with one light receiving unit and outputs information regarding the inclination of the first object and information regarding the inclination of the second object based on a result of the light receiving unit receiving the light.

Effects of the Invention

[0006] According to the present invention, it is possible to miniaturize a device capable of detecting the inclination of each of two objects.

Brief Description of the Drawings

[0007]

Figure 1

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Figure 2B

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Embodiments for Carrying Out the Invention

[0008] The tilt detection device, display device, line-of-sight depth position measurement device, and eyeball movement information output device according to embodiments of the present invention will be described in detail with reference to the drawings. However, the embodiments shown below are examples of the tilt detection device, display device, line-of-sight depth position measurement device, and eyeball movement information output device of the present invention, and are not limited thereto.

[0009] In addition, the dimensions, materials, shapes, relative arrangements, etc. of the components described in the embodiments of the present invention are not intended to limit the scope of the embodiments of the present invention only thereto without specific description, but are merely illustrative examples. Note that the sizes, positional relationships, etc. of the members shown in each drawing may be exaggerated for clarity of explanation. Further, in the following description, the same names and reference numerals indicate the same or equivalent members, and detailed descriptions thereof will be omitted as appropriate.

[0010] Hereinafter, for the sake of easy understanding, the arrangement and configuration of each part will be described using the XYZ orthogonal coordinate system. The X-axis, Y-axis, and Z-axis are mutually orthogonal. The direction in which the X-axis extends is referred to as the "X direction", the direction in which the Y-axis extends is referred to as the "Y direction", and the direction in which the Z-axis extends is referred to as the "Z direction". The direction in which the arrow indicating the X-axis points is denoted as the +X direction or the +X side, and the direction opposite to the +X direction is denoted as the -X direction or the -X side. The direction in which the arrow indicating the Y-axis points is denoted as the +Y direction or the +Y side, and the direction opposite to the +Y direction is denoted as the -Y direction or the -Y side. The direction in which the arrow indicating the Z-axis points is denoted as the +Z direction or the +Z side, and the direction opposite to the +Z direction is denoted as the -Z direction or the -Z side. In this specification, the +Y direction is referred to as "up", the -Z direction is referred to as "down", the +X direction is referred to as "right side", and the -X direction is referred to as "left side". Also, in this specification, a view of an object seen from the +Y direction is referred to as a top view, and a view of an object seen from the -Z direction is referred to as a front view. However, these only describe the relationships of relative positions, orientations, directions, etc., and do not have to match the relationships during use. Also, these directions are independent of the direction of gravity.

[0011] [First Embodiment] <Configuration of the tilt detection device according to the first embodiment of the present invention> With reference to FIGS. 1 to 3, the configuration of the tilt detection device according to the first embodiment of the present invention will be described. FIG. 1 is a schematic top view showing an example of the tilt detection device 100 according to the first embodiment of the present invention. FIG. 2A is a schematic front view showing a first example of the tilt detection device 100. FIG. 2B is a schematic front view showing a second example of the tilt detection device 100. FIG. 3 is a schematic side view showing an example of the tilt detection device 100 according to the first embodiment of the present invention.

[0012] (Overall Configuration) As shown in FIGS. 1 to 3, the tilt detection device 100 has a light source 1 including a first light emitting unit 11 and a second light emitting unit 12 different from the first light emitting unit 11. Further, the tilt detection device 100 has one light receiving unit 2 that receives a first reflected light L12 reflected by a first object E1 from among the lights L11 emitted from the first light emitting unit 11 and a second reflected light L22 reflected by a second object E2 from among the lights L21 emitted from the second light emitting unit 12. Further, the tilt detection device 100 has a processing unit 3 that outputs information A1 regarding the tilt of the first object E1 and information A2 regarding the tilt of the second object E2 respectively based on the result received by the light receiving unit 2.

[0013] In the example shown in FIGS. 1 to 3, the tilt detection device 100 is supported by a support 6 including a temple 61 and a front 62. The support 6 shown in FIGS. 1 to 3 is a glasses-type support. The first object E1 is the right eye of the wearer U of the support 6. The second object E2 is the left eye of the wearer U of the support 6. The tilt detection device 100 outputs information A1 regarding the tilt of the right eye of the wearer U and information A2 regarding the tilt of the left eye of the wearer U to an external device such as a microcomputer. The external device can acquire information regarding the line of sight of the wearer U based on the information A1 regarding the tilt of the right eye and the information A2 regarding the tilt of the left eye input from the tilt detection device 100. The information regarding the line of sight of the wearer U is, for example, information regarding the line of sight direction of the wearer U. Here, the "information regarding the line of sight direction" includes the position of the pupil or the cornea, or the relative position between the incident position of light on the eyeball and the pupil.

[0014] Note that in FIGS. 1 to 3, for the purpose of showing that the wearer U includes the first object E1, the reference numeral of the wearer U and the reference numeral of the first object E1 are shown together. Further, for the purpose of showing that the wearer U includes the second object E2, the reference numeral of the wearer U and the reference numeral of the second object E2 are shown together. There may be cases where reference numerals are shown together for the same purpose hereinafter.

[0015] In this embodiment, based on the results received by one light-receiving unit 2 that receives the first reflected light L12 and the second reflected light L22, the inclination detection device 100 outputs information regarding the inclination of each of the first object E1 and the second object E2 by the processing unit 3. Thereby, compared with the case of having two or more light-receiving units corresponding to the first reflected light L12 and the second reflected light L22, the inclination detection device 100 can be miniaturized as much as the space for arranging the light-receiving unit can be saved. In this embodiment, the inclination detection device 100 capable of detecting the inclination of each of the first object E1 and the second object E2 can be miniaturized. The light-receiving unit 2 can receive the first reflected light L12 and the second reflected light L22 at any timing, whether at the same timing, at a timing where a part overlaps in time, or at different timings from each other.

[0016] In the examples shown in FIGS. 1 to 3, the light source 1 is a vertical cavity surface emitting laser. The vertical cavity surface emitting laser shown in FIGS. 1 to 3 is arranged on the -Z side surface of the substrate 7. In the inclination detection device 100, by using the vertical cavity surface emitting laser as the light source 1, the light source 1 can be miniaturized compared with the case of using a plurality of semiconductor lasers (LD: Laser Diode) or the case of using a plurality of light emitting diodes (LED: Light Emitting Diode). Further, in the inclination detection device 100, by using the vertical cavity surface emitting laser as the light source 1, the configuration of the light source 1 can be simplified, and furthermore, the relative position adjustment between the first light emitting unit 11 and the second light emitting unit 12 can be easily performed. However, each of the first light emitting unit 11 and the second light emitting unit 12 is not limited to the light emitting unit included in the vertical cavity surface emitting laser, and may be a semiconductor laser, a light emitting diode, or the like as long as it can emit light. The light source 1 is not limited to the vertical cavity surface emitting laser, and may be configured to include one or more semiconductor lasers, one or more light emitting diodes, or the like.

[0017] In addition to the first light emitting unit 11 and the second light emitting unit 12, the light source 1 may further include a light emitting unit. By having the light source 1 include a plurality of light emitting units and selecting the light emitting unit that emits light in accordance with the movements of the first object E1 and the second object E2, the tilt detection device 100 can detect the respective tilts following the movements of the first object E1 and the second object E2. For example, even when the wearer U of the support 6 moves both eyes, the tilt detection device 100 changes the light emitting unit that emits light among the plurality of light emitting units so that the first reflected light L12 and the second reflected light L22 reach the light receiving unit 2, receives the first reflected light L12 and the second reflected light L22 by the light receiving unit 2, and can detect the line-of-sight direction following the movements of both eyes. In order to prevent the light emitted from the light source 1 from being visually recognized by the wearer U, the light emitted from the light source 1 preferably has a wavelength in the non-visible region such as infrared. From the viewpoint of reducing noise due to sunlight by the absorption effect of water vapor, the light source 1 preferably emits light with a peak wavelength of 940 nm.

[0018] For the light receiving unit 2, a photoelectric conversion element such as a photodiode (PD) or a position detection element such as a PSD (Position Sensitive Detector) can be used. Also, an imaging element such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor) may be used for the light receiving unit 2. From the viewpoint of performing robust position estimation with respect to the beam profile and light intensity of the light incident on the light receiving unit 2, it is preferable to use a PSD configured by a resistive film whose light receiving surface consists of a continuous surface for the light receiving unit 2.

[0019] In the example shown in FIGS. 1 to 3, the light receiving unit 2 is disposed on the -Z side surface of the substrate 7 on which the light source 1 is disposed. However, the light source 1 and the light receiving unit 2 may be disposed on separate substrates. The light receiving unit 2 is connected to the processing unit 3 and outputs an output signal Sg, which is the result of the light receiving unit 2 receiving light, to the processing unit 3.

[0020] The processing unit 3 is composed of a processor, an electronic circuit, an electric circuit, or the like. The processing unit 3 may be arranged on the vine 61 of the support 6, may be arranged on the front 62, or may be arranged at a position separated from the support 6. The configuration of the processing unit 3 will be described in detail with reference to FIGS. 4 and 5.

[0021] In the example shown in FIGS. 1 to 3, the tilt detection device 100 includes a first deflection member 41 that deflects the light L11 emitted from the first light emitting unit 11, and a second deflection member 42 that guides the light L11 deflected by the first deflection member 41 to the first object E1. Further, the tilt detection device 100 includes a third deflection member 43 that deflects the light L21 emitted from the second light emitting unit 12, and a fourth deflection member 44 that guides the light L21 deflected by the third deflection member 43 to the second object E2. The first light emitting unit 11 and the second light emitting unit 12 are arranged on the same substrate 7.

[0022] In the example shown in FIGS. 1 and 2A, the first deflection member 41 and the third deflection member 43 are arranged on the front 62, the second deflection member 42 is arranged on the right vine 61, the fourth deflection member 44 is arranged on the left vine 61, and the substrate 7 is arranged on the front 62. Each of the second deflection member 42 and the fourth deflection member 44 includes a concave mirror. The radius of curvature of the concave mirror is determined such that the first reflected light L12 and the second reflected light L22 are each focused toward the light receiving unit 2. By using a concave mirror for each of the second deflection member 42 and the fourth deflection member 44, the amount of light of each of the first reflected light L12 and the second reflected light L22 received by the light receiving unit 2 can be increased, and the detection accuracy of the tilt detection device 100 can be improved. Further, by using a concave mirror, the configuration of the tilt detection device 100 can be simplified and the tilt detection device 100 can be miniaturized as compared with the case where a deflection member that deflects the first reflected light L12 and the second reflected light L22 and a focusing member such as a lens that focuses the first reflected light L12 and the second reflected light L22 are provided separately.

[0023] The concave mirror may be spherical or aspherical. Also, as long as the second deflection member 42 can deflect the first reflected light L12, it is not limited to a mirror, and may be a prism, a diffraction grating, or the like. The deflection surface of the second deflection member 42 is not limited to a concave surface, and may be a flat surface or the like. As long as the fourth deflection member 44 can deflect the second reflected light L22, it is not limited to a mirror, and may be a prism, a diffraction grating, or the like. The deflection surface of the fourth deflection member 44 is not limited to a concave surface, and may be a flat surface or the like. The shapes, sizes, etc. of the first deflection member 41, the second deflection member 42, the third deflection member 43, and the fourth deflection member 44 can be appropriately changed.

[0024] In the example shown in FIGS. 1 and 2A, the second deflection member 42 and the fourth deflection member 44 are arranged below the height of the central portions of the first object E1 and the second object E2, which are the eyes of the wearer U. The light L11 from the light source 1 enters the second deflection member 42 from below the first object E1, and the light L21 from the light source 1 enters the fourth deflection member 44 from below the second object E2. By doing so, it is possible to reduce the blocking of the light L11 and the light L21 by the eyelids and eyelashes of the wearer U, and to avoid a decrease in the amount of light received by the light receiving unit 2.

[0025] Each of the first deflection member 41 to the fourth deflection member 44 can be configured to include a metal material, a glass material, a resin material, or the like. By applying a metal film to the surface of the glass material or the resin material, at least one of the first deflection member 41 to the fourth deflection member 44 can also be configured.

[0026] As shown in FIG. 2B, in the tilt detection device 100, the first light emitting unit 11 can also be arranged on the right arm 61, and the second light emitting unit 12 can be arranged on the left arm 61. In this case, the tilt detection device 100 does not have to include the first deflection member 41, the second deflection member 42, the third deflection member 43, and the fourth deflection member 44.

[0027] The inclination detection device 100 shown in Fig. 1 has a light guide unit 5 that guides the first reflected light L21 and the second reflected light L22 to the light receiving unit 2 respectively. The light guide unit 5 is arranged between a first central axis C1 that intersects the direction Ar in which the first object E1 and the second object E2 are arranged and passes through the center E1C of the first object E1, and a second central axis C2 that intersects the direction Ar in which the above are arranged and passes through the center E2C of the second object E2. With this configuration, since the light guide unit 5 that guides the first reflected light L12 and the second reflected light L22 to the light receiving unit 2 respectively can be shared, the inclination detection device 100 can be miniaturized and the configuration of the inclination detection device 100 can be simplified.

[0028] The light guide unit 5 shown in Fig. 1, Fig. 2A, and Fig. 2B has a first lens 51 that transmits the first reflected light L12 and a second lens 52 that transmits the second reflected light L22. Also, the light guide unit 5 shown in Fig. 1, Fig. 2A, and Fig. 2B is arranged between the first lens 51 and the second lens 52, and has a prism 53 that deflects the first reflected light L12 transmitted through the first lens 51 and the second reflected light L22 transmitted through the second lens 52 in the direction where the light receiving unit 2 is located. The first lens 51, the prism 53, and the second lens 52 are integrally configured. With this configuration, the light guide unit 5 can be configured as one member and can also be miniaturized. By configuring the light guide unit 5 as one member, the configuration of the inclination detection device 100 can be simplified. Also, by miniaturizing the light guide unit 5, the inclination detection device 100 can be miniaturized. Note that "configuring the first lens 51, the prism 53, and the second lens 52 integrally" means forming the first lens 51, the prism 53, and the second lens 52 as one member without separating them from each other. The first lens 51, the prism 53, and the second lens 52 shown in Fig. 1, Fig. 2A, and Fig. 2B are integrally configured by being joined to each other by an adhesive member.

[0029] In the examples shown in FIGS. 1, 2A, and 2B, the first light emitting unit 11 and the second light emitting unit 12 each emit linearly polarized light. The prism 53 includes a first surface S1 that reflects the first reflected light L12 polarized in the first direction toward the light receiving unit 2 and transmits the second reflected light L22 polarized in the second direction orthogonal to the first direction. The prism 53 also includes a second surface S2 that reflects the second reflected light L22 polarized in the second direction toward the light receiving unit 2 and transmits the first reflected light L12 polarized in the first direction. The light guide unit 5 shown in FIGS. 1, 2, and 2B has a half-wave plate 54 that rotates the polarization direction of the incident linearly polarized light by 90 degrees. The half-wave plate 54 is disposed either between the first reflection point P1 of the first reflected light L12 by the first object E1 and the prism 53 or between the second reflection point P2 of the second reflected light L22 by the second object E2 and the prism 53.

[0030] In the examples shown in FIGS. 1, 2, and 2B, the first light emitting unit 11 and the second light emitting unit 12 emit linearly polarized light polarized in the same polarization direction. The first reflected light L12 before entering the half-wave plate 54 is S-polarized light having a polarization direction of the second direction parallel to the Y direction. The half-wave plate 54 is disposed with its optical axis inclined 45 degrees with respect to the Y direction. The first reflected light L12 passes through the half-wave plate 54, whereby the deflection direction rotates by 90 degrees and is converted into P-polarized light having a polarization direction of the first direction parallel to the Z direction. Thereby, the first reflected light L12 of P-polarized light having a polarization direction of the first direction parallel to the Z direction enters the prism 53. On the other hand, the second reflected light L22 enters the prism 53 while remaining S-polarized light having a polarization direction of the second direction parallel to the Y direction.

[0031] A part of the first reflected light L12 incident on the prism 53 is incident on the second surface S2. Since the second surface S2 transmits P-polarized light, the first reflected light L12 incident on the second surface S2 passes through the second surface S2 and is incident on the first surface S1. Since the first surface S1 reflects P-polarized light, the first reflected light L12 incident on the first surface S1 is reflected by the first surface S1 toward the light receiving part 2. Another part of the first reflected light L12 incident on the prism 53 is directly incident on the first surface S1. Since the first surface S1 reflects P-polarized light, the first reflected light L12 directly incident on the first surface S1 is reflected by the first surface S1 toward the light receiving part 2.

[0032] On the other hand, a part of the second reflected light L22 incident on the prism 53 is incident on the first surface S1. Since the first surface S1 transmits S-polarized light, the second reflected light L22 incident on the first surface S1 passes through the first surface S1 and is incident on the second surface S2. Since the second surface S2 reflects S-polarized light, the second reflected light L22 incident on the second surface S2 is reflected by the second surface S2 toward the light receiving part 2. Another part of the second reflected light L22 incident on the prism 53 is directly incident on the second surface S2. Since the second surface S2 reflects S-polarized light, the second reflected light L22 directly incident on the second surface S2 is reflected by the second surface S2 toward the light receiving part 2.

[0033] As described above, in the examples shown in FIGS. 1, 2, and 2B, by using polarization, each of the first reflected light L12 and the second reflected light L22 can be efficiently guided toward the light receiving part 2. Thereby, the amount of light of each of the first reflected light L12 and the second reflected light L22 received by the light receiving part 2 can be increased, and the detection accuracy by the tilt detection device 100 can be improved.

[0034] In the examples shown in FIGS. 1, 2, and 2B, the prism 53 is configured by arranging four triangular prism members having a right triangle outer edge shape in a top view so that the right-angled corners are close to each other and joining them with an adhesive member. By forming a film having polarization selectivity on the surfaces corresponding to the first surface S1 and the second surface S2 of the four triangular prism members, polarization selectivity can be imparted to the first surface S1 and the second surface S2.

[0035] The first light emitting unit 11 and the second light emitting unit 12 can also emit linearly polarized light whose polarization directions are substantially orthogonal to each other. For example, separate semiconductor lasers are used as the first light emitting unit 11 and the second light emitting unit 12, and the semiconductor lasers are arranged such that the polarization directions of the laser light emitted from each semiconductor laser are substantially orthogonal. Thereby, linearly polarized light whose polarization directions are substantially orthogonal to each other can be emitted from the first light emitting unit 11 and the second light emitting unit 12. In this case, the light guiding unit 5 may not have a half-wave plate 54.

[0036] Each of the first lens 51 and the second lens 52 shown in FIGS. 1, 2, and 2B is a D-cut lens formed such that the shape of the outer edge in a top view is D-shaped. By using D-cut lenses for the first lens 51 and the second lens 52, while reducing the contact of the first lens 51 and the second lens 52 with the face and nose of the wearer U of the support 6, the first lens 51 and the second lens 52 can be made thinner, that is, the lengths of the first lens 51 and the second lens 52 along the above-described arranged direction Ar can be shortened, and the light guiding unit 5 can be miniaturized.

[0037] The configuration of the light guiding unit 5 is not limited to including the first lens 51, the second lens 52, and the prism 53. For example, a lens that focuses each of the first reflected light L12 and the second reflected light L22 toward the light receiving unit 2 may be used as the light guiding unit 5. In this case, two lenses, one that transmits the first reflected light L12 and one that transmits the second reflected light L22, may be used for the lens, or one lens that transmits both the first reflected light L12 and the second reflected light L22 may be used. When the light guiding unit 5 is configured by one lens, the configuration of the light guiding unit 5 can be simplified and the light guiding unit 5 can be miniaturized.

[0038] The lens such as the first lens 51 or the second lens 52, or the prism 53 in the light guide part 5 can be configured to include a light-transmissive glass material, a resin material, or the like. It is preferable that the light transmittance of each of the first lens 51, the second lens 52, and the prism 53 is 60% or more with respect to the emission peak wavelength of the light from the light source 1. For the half-wave plate 54, a crystal, a birefringent resin, or the like can be used.

[0039] The support 6 can be configured to include a metal material, a resin material, or the like. The shape and color of the support 6 can be appropriately selected. Note that the support for supporting the tilt detection device 100 is not limited to the support 6, and may be a goggle-type support, a head-mounted support such as a helmet, or the like.

[0040] (Hardware Configuration of Processing Unit 3) FIG. 4 is a block diagram showing an example of the hardware configuration of the processing unit 3 included in the tilt detection device 100. The processing unit 3 includes a CPU (Central Processing Unit) 301, a ROM (Read Only Memory) 302, a RAM (Random Access Memory) 303, and a communication I / F (Interface) 304. These are connected to be communicable with each other via a system bus B.

[0041] The processing unit 3 is communicably connected to the light source 1 and the light receiving unit 2 via the communication I / F 304. Note that the processing unit 3 may further include a non-volatile memory such as an HDD (Hard Disk Drive) or an SSD (Solid State Drive). Further, the tilt detection device 100 may further include an operation unit for operating the tilt detection device 100, a display unit for displaying various notifications, etc., and these may be communicably connected to the processing unit 3.

[0042] The CPU 301 executes processes including various arithmetic operations. The ROM 302 is a non-volatile memory that stores programs used to drive the CPU 301 such as the IPL (Initial Program Loader). The RAM 303 is a volatile memory used as a work area for the CPU 301. The communication I / F 304 is an interface for performing communication between the processing unit 3 and devices other than the processing unit 3. In the tilt detection device 100, devices other than the processing unit 3 are external devices such as the light source 1, the light receiving unit 2, or an external device such as a microcomputer.

[0043] In the example shown in FIG. 4, the processing unit 3 outputs a first modulation signal Ms1 to the first light emitting unit 11 of the light source 1 and outputs a second modulation signal Ms2 to the second light emitting unit 12 of the light source 1. The first light emitting unit 11 emits light L11 to the first object E1 according to the first modulation signal Ms1. The second light emitting unit 12 emits light L21 to the second object E2 according to the second modulation signal Ms2. The light receiving unit 2 receives the first reflected light L12 from the first object E1 and the second reflected light L22 from the second object E2, and outputs an output signal Sg to the processing unit 3. The processing unit 3 can output information A1 regarding the tilt of the first object E1 and information A2 regarding the tilt of the second object E2 respectively based on the output signal Sg.

[0044] (Functional configuration of the processing unit 3) With reference to FIGS. 5 to 10, the functional configuration of the processing unit 3 will be described. FIG. 5 is a block diagram showing an example of the functional configuration of the processing unit 3. FIG. 6 is a diagram showing a first example of the modulation process and the extraction process by the inclination detection device 100, and is a diagram showing the output signal Sg of the light receiving unit 2 and a first example of the first modulation information Mi1. FIG. 7 is a diagram showing a first example of the modulation process and the extraction process by the inclination detection device 100, and is a diagram showing the output signal Sg of the light receiving unit 2 and a first example of the second modulation information Mi2. FIG. 8 is a diagram showing a first example of the modulation process and the extraction process by the inclination detection device 100, and is a diagram showing the output signal Sg of the light receiving unit 2 and a second example of the first modulation information Mi1. FIG. 9 is a diagram showing a first example of the modulation process and the extraction process by the inclination detection device 100, and is a diagram showing the output signal of the light receiving unit 2 and a second example of the second modulation information Mi2. FIG. 10 is a diagram showing a second example of the extraction process by the inclination detection device 100.

[0045] The processing unit 3 shown in FIG. 5 has a modulation unit 31 that modulates the light emitted from each of the first light emitting unit 11 and the second light emitting unit 12. Further, the processing unit 3 extracts information R1 regarding the first reflected light L12 and information R2 regarding the second reflected light L22 from the output signal Sg of the light receiving unit 2 based on the first modulation information Mi1 of the first light emitting unit 11 by the modulation unit 31 and the second modulation information Mi2 of the second light emitting unit 12 by the modulation unit 31. The processing unit 3 has an extraction unit 32. Further, the processing unit 3 has an output unit 33 that outputs information A1 regarding the inclination of the first object E1 based on the information R1 regarding the first reflected light L12 and outputs information A2 regarding the inclination of the second object E2 based on the information R2 regarding the second reflected light L22. Also, the processing unit 3 shown in FIG. 5 has a first inclination acquisition unit 34 that obtains information A1 regarding the inclination of the first object E1 by calculation based on the information R1 regarding the first reflected light L12, and a second inclination acquisition unit 35 that obtains information A2 regarding the inclination of the second object E2 by calculation based on the information R2 regarding the second reflected light L22. In the example shown in FIG. 5, the output unit 33 outputs the information A1 regarding the inclination of the first object E1 obtained by the first inclination acquisition unit 34 and the information A2 regarding the inclination of the second object E2 obtained by the second inclination acquisition unit 35.

[0046] The functions of the modulation unit 31 and the extraction unit 32 can be realized by the communication I / F 304 and the CPU 301 executing the processes defined in the programs stored in the ROM 302. The functions of the first slope acquisition unit 34 and the second slope acquisition unit 35 can be realized by the CPU 301 executing the processes defined in the programs stored in the ROM 302. The function of the output unit 33 can be realized by the communication I / F 304 or the like.

[0047] The modulation unit 31 and the extraction unit 32 may be included in a configuration other than the processing unit 3. For example, an external device such as a microcomputer or a PC (Personal Computer) capable of communicating with the processing unit 3 may have the modulation unit 31 and the extraction unit 32. Alternatively, the functions of the modulation unit 31 and the extraction unit 32 may be realized by a processor, an electronic circuit, or an electric circuit different from the processor, the electronic circuit, or the electric circuit that realizes the functions of the processing unit 3. Further, the processor, the electronic circuit, or the electric circuit that realizes the functions of the modulation unit 31 and the extraction unit 32 may be arranged on a substrate different from the substrate on which the processor, the electronic circuit, or the electric circuit that realizes the functions of the processing unit 3 is arranged.

[0048] Each function included in the processing unit 3 can also be realized by one or more processing circuits. Note that the processing circuits include an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), a DSP (digital signal processor), or an electric circuit capable of executing each of the above functions. Further, a part of the above functions included in the processing unit 3 may be realized by an external device such as a microcomputer or a PC connected to be communicable with the processing unit 3. Furthermore, a part of the above functions included in the processing unit 3 may be realized by distributed processing between the processing unit 3 and an external device.

[0049] In the example shown in FIG. 5, the processing unit 3 modulates each of the first light emitting unit 11 and the second light emitting unit 12 by the modulation unit 31, and extracts, from the output signal Sg of one light receiving unit 2, information R1 regarding the first reflected light L12 and information R2 regarding the second reflected light L22 by the extraction unit 32. Based on the information R1 regarding the first reflected light L12 and the information R2 regarding the second reflected light L22, the processing unit 3 acquires and outputs information A1 regarding the inclination of the first object E1 and information A2 regarding the inclination of the second object E2. Thereby, since the processing unit 3 can output information regarding the inclination of each of the first object E1 and the second object E2 based on the output signal Sg of one light receiving unit 2, the arrangement space of the light receiving unit 2 can be saved as compared with the case of using two light receiving units.

[0050] (First Example of Extraction Processing) In the first example of the extraction processing, the modulation unit 31 time-modulates the light L11 emitted from the first light emitting unit 11 according to the first coding pattern, and time-modulates the light emitted from the second light emitting unit 12 according to the second coding pattern orthogonal to the first coding pattern. The first coding pattern corresponds to an example of the first modulation information Mi1. The second coding pattern corresponds to an example of the second modulation information Mi2. By using the first coding pattern and the second coding pattern, information R1 regarding the first reflected light L12 and information R2 regarding the second reflected light L22 can be extracted from the output signal Sg with high accuracy by simple processing. Thereby, the inclination detection device 100 can acquire and output information A1 regarding the inclination of the first object E1 and information A2 regarding the inclination of the second object E2 with high accuracy.

[0051] For the first coding pattern and the second coding pattern, for example, patterns corresponding to each row of the Hadamard matrix can be used. The Hadamard matrix is a matrix consisting of two values, the elements "-1" and "1". Each row constituting the Hadamard matrix is orthogonal to each other. In the modulation of the light source 1 using the Hadamard matrix, the light source 1 lights up at the timing when the Hadamard matrix becomes "1", and the light source 1 goes out at the timing when the Hadamard matrix becomes "-1". Note that lighting means emitting light, and turning off means not emitting light.

[0052] In the first example shown in FIGS. 6 and 7, the first modulation information Mi1 shown in FIG. 6 corresponds to one row of the Hadamard matrix, and the second modulation information Mi2 shown in FIG. 7 corresponds to another row of the Hadamard matrix. The modulation unit 31 can modulate the emission of the light L11 from the first light emitting unit 11 according to the first modulation information Mi1 of "1, 1, -1, -1". The modulation unit 31 can modulate the emission of the light L21 from the second light emitting unit 12 according to the second modulation information Mi2 of "1, -1, 1, -1". The output signal Sg shown in FIGS. 6 and 7 is the output signal of the light receiving unit 2 that has received the first reflected light L12 derived from the light L11 modulated by the first modulation signal Ms1 corresponding to the first modulation information Mi1 and the second reflected light L22 derived from the light L21 modulated by the second modulation signal Ms2 corresponding to the second modulation information Mi2. Note that the output signal Sg shown in FIG. 6 and the output signal Sg shown in FIG. 7 are the same signal.

[0053] The extraction unit 32 extracts information R1 regarding the first reflected light L12 from the output signal Sg by performing an inner product operation between the first modulation information Mi1 received from the modulation unit 31 and the output signal Sg of the light receiving unit 2. The extraction unit 32 extracts information R2 regarding the second reflected light L22 from the output signal Sg by performing an inner product operation between the second modulation information Mi2 received from the modulation unit 31 and the output signal Sg of the light receiving unit 2. As a result of these operations, the processing unit 3 can obtain the information R1 regarding the first reflected light L12 and the information R2 regarding the second reflected light L22 from the output signal Sg of one light receiving unit 2. When a PSD is used for the light receiving unit 2, in estimating the incident positions of the first reflected light L12 and the second reflected light L22 on the PSD, the above inner product operation is executed for the output of each of the four output terminals of the PSD, and the incident positions are estimated by an operation using the four inner product values.

[0054] In the second example shown in FIGS. 8 and 9, the first modulation information Mi1 shown in FIG. 8 corresponds to one row of the Hadamard matrix, and the second modulation information Mi2 shown in FIG. 9 corresponds to another row of the Hadamard matrix. In the second example shown in FIGS. 8 and 9, the inclinations of the first object E1 and the second object E2 are different, and only the second reflected light L22 from the second object E2 is incident on the light receiving unit 2, and the first reflected light L12 from the first object E1 is not incident on the light receiving unit 2. The extraction unit 32 extracts information R1 regarding the first reflected light L12 from the output signal Sg by performing an inner product operation between the first modulation information Mi1 received from the modulation unit 31 and the output signal Sg of the light receiving unit 2. The extraction unit 32 extracts information R2 regarding the second reflected light L22 from the output signal Sg by performing an inner product operation between the second modulation information Mi2 received from the modulation unit 31 and the output signal Sg of the light receiving unit 2. As a result, the processing unit 3 can obtain the information R1 regarding the first reflected light L12 and the information R2 regarding the second reflected light L22 from the output signal Sg of one light receiving unit 2.

[0055] Here, since the curvature of the cornea in the eyeball is large, in order to detect the rotational movement of the eyeball by the inclination detection device 100, it is necessary to use the light source 1 including a plurality of light emitting units, switch the light emitting unit to be lit among the plurality of light emitting units, that is, determine in advance the angular range of the eyeball rotation borne by each light emitting unit, and irradiate light. The Hadamard matrix is used to extract the information R1 regarding the first reflected light L12 and the information R2 regarding the second reflected light L22 from the output signal Sg of the light receiving unit 2. By assigning the coding patterns corresponding to each row of the Hadamard matrix to the plurality of light emitting units included in the light source 1, it is also possible to extract the information regarding the reflected light from the eyeball derived from each of the plurality of light emitting units. Instead of lighting the plurality of light emitting units simultaneously, they may be lit separately in time series. In this case, the inclination of the eyeball can be acquired over a wide angular range while sweeping the light emitting units regularly or irregularly in time.

[0056] (Second example of extraction process) In the second example of the extraction process, the modulation unit 31 causes the first light emitting unit and the second light emitting unit to emit light in non-overlapping periods. FIG. 10 is a timing chart showing the output signal Sg of the light receiving unit 2, the information R1 regarding the first reflected light L12 extracted by the extraction unit 32, and the information R2 regarding the second reflected light L22 extracted by the extraction unit 32.

[0057] In the example shown in FIG. 10, the modulation unit 31 modulates the first light emitting unit 11 so as to alternately turn on and off at a period T0 in the first period T1, and modulates the second light emitting unit 12 so as to alternately turn on and off at a period T0 in the second period T2. The first period T1 and the second period T2 are non-overlapping periods. The extraction unit 32 extracts, as the information R1 regarding the first reflected light L12, the first integrated signal R11 obtained by integrating the output signal Sg of the light receiving unit 2 in the first period T1. Further, the extraction unit 32 extracts, as the information R2 regarding the second reflected light L22, the second integrated signal R21 obtained by integrating the output signal Sg of the light receiving unit 2 in the second period T2. The tilt detection device 100 can extract the information R1 regarding the first reflected light L12 and the information R2 regarding the second reflected light L22 from the output signal Sg of one light receiving unit 2 by such modulation processing and extraction processing.

[0058] From another perspective, in the example shown in FIG. 10, the modulation unit 31 provides non-overlapping time slots for each of the right eye and the right left eye, and controls the emission of light from the first light emitting unit 11 and the second light emitting unit 12 so that the first reflected light L12 from the right eye and the second reflected light L22 from the left eye do not simultaneously enter the light receiving unit 2. The extraction unit 32 can separately extract information R1 regarding the first reflected light L12 from the output signal Sg of the light receiving unit 2 in the first period T1 and information R2 regarding the second reflected light L22 from the output signal Sg of the light receiving unit 2 in the second period T2. The extraction unit 32 separates and extracts the information R1 regarding the first reflected light L12 while integrating the 8 bits of the output signal Sg in the right eye as a signal obtained within the time slot for the right eye. Further, the extraction unit 32 separates and extracts the information R2 regarding the second reflected light L22 while integrating the 8 bits of the output signal by the left eye as a signal obtained within the time slot for the left eye. By performing the integration process, the extraction unit 32 can reduce the noise in the output signal Sg by averaging.

[0059] In the second example, in order to control the light receiving unit 2 so that it does not receive the first reflected light L12 and the second reflected light L22 simultaneously, the inclination of each of the right eye and the left eye can be detected by a simple process.

[0060] [Second Embodiment] Next, with reference to FIGS. 11 and 12, a display device according to the second embodiment will be described. Note that the same names and reference numerals as those in the already described embodiments indicate the same or similar members or configurations, and detailed descriptions will be omitted as appropriate. This also applies to the embodiments shown hereinafter.

[0061] FIG. 11 is a schematic perspective view showing an example of a display device 200 according to the second embodiment of the present invention. FIG. 12 is a schematic diagram showing a part of the configuration of the display device 200. Note that in FIG. 12, the configuration for the left eye is illustrated, but the display device 200 has the same configuration for the right eye as well.

[0062] The display device 200 includes a support 6 and an inclination detection device 100. The first object E1 is the right eye of the wearer U of the support 6, and the second object E2 is the left eye of the wearer U. The display device 200 performs display according to the information A1 regarding the inclination of the first object E1 and the information A2 regarding the inclination of the second object E2 output from the inclination detection device 100.

[0063] In the examples shown in FIGS. 11 and 12, the display device 200 is a head-mounted display that can be worn on a human head. The display device 200 includes a stem 61 and a front 62. The front 62 includes a light guide plate 210. An optical system, a control device, etc. can be arranged on the stem 61. The display device 200 shown in FIGS. 11 and 12 includes a control device 220, a light source unit 230, a light quantity adjuster 240, a movable device 250 having a reflecting surface 251, a light guide plate 210, and a half mirror 211.

[0064] The light source unit 230 is a unit formed by housing a red laser light source that emits red laser light, a green laser light source that emits green laser light, a blue laser light source that emits blue laser light, a collimator lens, a dichroic mirror, etc. in an optical housing. In the light source unit 230, the three-color laser lights are combined by a dichroic mirror. The light source unit 230 emits parallel light in which the three-color laser lights are combined.

[0065] The light from the light source unit 230 is adjusted in light quantity by the light quantity adjuster 240 and then enters the movable device 250. The movable device 250 moves the reflecting surface 251 in the XY directions based on a signal from the control device 220 and two-dimensionally scans the light from the light source unit 230. The drive control of this movable device 250 is performed in synchronization with the light emission timing of each laser light source in the light source unit 230, and a color image is formed by the scanning light M.

[0066] The scanning light M by the movable device 250 is incident on the light guide plate 210. The light guide plate 210 guides the scanning light M to the half mirror 211 while reflecting it on the inner wall surface. The light guide plate 210 is formed of a resin or the like that is transparent to the wavelength of the scanning light M.

[0067] The half mirror 211 reflects the light from the light guide plate 210 to the back side of the display device 200 and emits it in the direction where the eyes of the wearer U of the support 6 are located, that is, the direction where the second object E2 is located. The half mirror 211 has, for example, a free-form surface shape. The image by the scanning light M is imaged on the retina of the wearer U by reflection at the half mirror 211. Alternatively, it is imaged on the retina of the wearer U by the reflection at the half mirror 211 and the lens effect of the crystalline lens in the eyeball. Also, due to the reflection at the half mirror 211, the spatial distortion of the image is corrected.

[0068] The wearer U can visually recognize the image formed by the light scanned in the XY directions. In the examples shown in FIGS. 11 and 12, the wearer U can visually recognize an image in which the image by the light from the outside world passing through the half mirror 211 and the image by the scanning light M are superimposed. By providing a mirror instead of the half mirror 211, the light from the outside world can be eliminated, and the configuration may be such that the wearer U can visually recognize only the image by the scanning light M.

[0069] The display device 200 controls the irradiation position of the scanning light M by the movable device 250 so that a color image is formed on the retina through the pupil of the eyeball according to the tilt detection result of the wearer U's eyeball by the tilt detection device 100. Thereby, even when the wearer U's eyeball is tilted, a color image can be appropriately formed on the retina of the wearer U, and the wearer U can visually recognize the color image. The tilt detection device 100 is a small device capable of detecting the tilt of each of the wearer U's both eyes. Therefore, in the display device 200, the tilt detection device 100 is arranged in a narrow space such as the front 62 of the support 6, and a color image can be formed at an appropriate position according to the tilt of both eyes of the wearer U, and the wearer U can visually recognize the color image.

[0070] [Third Embodiment] FIG. 13 is a schematic top view showing an example of a line-of-sight depth position measuring device 300 according to a third embodiment of the present invention.

[0071] The line-of-sight depth position measuring device 300 includes a support 6 and an inclination detection device 100. The first object E1 is the right eye of the wearer U of the support 6, and the second object E2 is the left eye of the wearer U. The line-of-sight depth position measuring device 300 outputs information Ed regarding the line-of-sight depth position at which the line of sight of the right eye and the line of sight of the left eye of the wearer U intersect, based on information A1 regarding the inclination of the first object E1 and information A2 regarding the inclination of the second object E2 output from the inclination detection device 100.

[0072] In the example shown in FIG. 13, the line-of-sight depth position measuring device 300 has a line-of-sight depth position output unit 310 that outputs information Ed regarding the line-of-sight depth position. The inclination detection device 100 acquires information A1 regarding the inclination of the first object E1 and information A2 regarding the inclination of the second object E2, and outputs them to the line-of-sight depth position output unit 310. The line-of-sight depth position output unit 310 acquires information regarding the first line-of-sight direction v1 of the right eye of the wearer U corresponding to the first object E1, based on information A1 regarding the inclination of the first object E1. Further, the line-of-sight depth position output unit 310 acquires information regarding the second line-of-sight direction v2 of the left eye of the wearer U corresponding to the second object E2, based on information A2 regarding the inclination of the second object E2. The line-of-sight depth position output unit 310 calculates the line-of-sight depth d based on the information regarding each of the first line-of-sight direction v1 and the second line-of-sight direction v2. The line-of-sight depth position output unit 310 can output information Ed regarding the line-of-sight depth position based on the line-of-sight depth d. From another perspective, the line-of-sight depth position measuring device 300 can measure the line-of-sight depth d.

[0073] The line-of-sight depth position Dp is the position where the first line-of-sight direction v1 and the second line-of-sight direction v2 intersect. The line-of-sight depth position Dp corresponds to the position where the focus of the wearer U's eyes is set. The line-of-sight depth d is the distance between the line-of-sight depth position Dp and at least one of the first object E1 and the second object E2 in a direction substantially orthogonal to the above-described arrangement direction Ar. For example, the line-of-sight depth d is the distance between the line passing through the first reflection point P1 and the second reflection point P2 and the line-of-sight depth position Dp in a direction substantially orthogonal to the above-described arrangement direction Ar.

[0074] The line-of-sight depth d measured by the line-of-sight depth position measuring device 300 is used when the wearer U visually recognizes an image displayed by the glasses-type display device or the like. Specifically, the glasses-type display device controls the position of the virtual display surface in a direction substantially orthogonal to the arrangement direction Ar so that the wearer U can visually recognize an image displayed on a virtual display surface including the line-of-sight depth position Dp corresponding to the line-of-sight depth d. Thereby, the glasses-type display device can make the wearer U visually recognize an in-focus image. However, the line-of-sight depth d measured by the line-of-sight depth position measuring device 300 can also be used for other purposes than the above.

[0075] The processing unit 3 may have the function of the line-of-sight depth position output unit 310. In this case, the function of the line-of-sight depth position output unit 310 can be realized by the communication I / F 304 shown in FIG. 4 and the processor such as the CPU 301 executing the processing defined by the program stored in the ROM 302. Further, an external device such as a microcomputer or a PC communicably connected to the processing unit 3 may have the function of the line-of-sight depth position output unit 310. The function of the line-of-sight depth position output unit 310 may be realized by a processor, an electronic circuit, or an electric circuit different from the processor, the electronic circuit, or the electric circuit that realizes the function of the processing unit 3. Further, the processor, the electronic circuit, or the electric circuit that realizes the function of the line-of-sight depth position output unit 310 may be arranged on a substrate different from the substrate on which the processor, the electronic circuit, or the electric circuit that realizes the function of the processing unit 3 is arranged.

[0076] [Fourth Embodiment] FIG. 14 is a schematic top view showing an eye movement information output device 400 according to a fourth embodiment of the present invention.

[0077] The eye movement information output device 400 includes a support 6 and an inclination detection device 100. The first object E1 is the right eye of the wearer U of the support 6, and the second object E2 is the left eye of the wearer U. Based on the information A1 regarding the inclination of the first object E1 and the information A2 regarding the inclination of the second object E2 output from the inclination detection device, information regarding the movement of each of the right and left eyes is output.

[0078] In the example shown in FIG. 14, the eye movement information output device 400 has an eye movement information output unit 410 that outputs information Fd regarding the movement of each of the right and left eyes. The inclination detection device 100 acquires the information A1 regarding the inclination of the first object E1 and the information A2 regarding the inclination of the second object E2, and outputs them to the eye movement information output unit 410. The eye movement information output unit 410 acquires information regarding the movement of the right eye of the wearer U corresponding to the first object E1 based on the information A1 regarding the inclination of the first object E1. Further, the eye movement information output unit 410 acquires information regarding the movement of the left eye of the wearer U corresponding to the second object E2 based on the information A2 regarding the inclination of the second object E2. The eye movement information output unit 410 can output the acquired information Fd regarding the movement of each of the right and left eyes. The information Fd regarding the movement of each of the right and left eyes can be used, for example, to recognize or evaluate the physical or mental state of the wearer U.

[0079] The processing unit 3 may have the function of the eye movement information output unit 410. In this case, the function of the eye movement information output unit 410 can be realized by, for example, the communication I / F 304 shown in FIG. 4 and the processing executed by the CPU 301 according to the program stored in the ROM 302. Further, an external device such as a microcomputer or a PC communicably connected to the processing unit 3 may have the function of the eye movement information output unit 410. The function of the eye movement information output unit 410 may be realized by a processor, an electronic circuit, or an electric circuit, etc., which is different from the processor, the electronic circuit, or the electric circuit, etc., that realizes the function of the processing unit 3. Further, the processor, the electronic circuit, or the electric circuit, etc., that realizes the function of the eye movement information output unit 410 may be arranged on a substrate different from the substrate on which the processor, the electronic circuit, or the electric circuit, etc., that realizes the function of the processing unit 3 is arranged.

[0080] As described above, the preferred embodiments have been described in detail. However, the present invention is not limited to the embodiments described above, and various modifications and substitutions can be made to the embodiments of the present invention without departing from the scope described in the claims.

[0081] The modulation of each of the first light emitting unit 11 and the second light emitting unit 12 by the modulation unit 31 is not limited to time modulation, and may be spatial modulation. The light receiving unit 2 receives the first reflected light L12 and the second reflected light L22 derived from the light L11 and the light L21 spatially modulated by the modulation unit 31, and outputs an output signal Sg. The extraction unit 32 can extract the information R1 regarding the first reflected light L12 and the information R2 regarding the second reflected light L22 from the output signal Sg using the information regarding the spatial modulation by the modulation unit 31.

[0082] In the example shown in FIGS. 1 to 3 described above, the configuration in which the light L11 and the light L21, and the first reflected light L12 and the second reflected light L22 each propagate in space is shown, but the present invention is not limited to this configuration. For example, a light transmissive member may be arranged between the light source 1 and the first object E1 and the second object E2, and between the first object E1 and the second object E2 and the light receiving unit 2, respectively, so that the light L11 and the light L21, and the first reflected light L12 and the second reflected light L22 each propagate in the light transmissive member.

[0083] For example, in the case of VR (Virtual Reality) or AR (Augmented Reality) goggles, in order to improve the adhesion to the wearer U of the goggles, prevent the displacement of the goggles when using the goggles, and improve the usability of the goggles, the periphery of the display unit in the goggles may be shaped to protrude toward the wearer U side. At this time, when the tilt detection device 100 having a configuration in which the light L11 and the light L21 from the light source 1 propagate in the space is arranged in the goggles, it is necessary to make the portion where the tilt detection device 100 in the goggles is arranged protrude further toward the wearer U side than the above-mentioned protruding portion. When the portion where the tilt detection device 100 in the goggles is arranged protrudes, there is a possibility that the tilt detection device 100 comes into contact with the wearer U. The fact that the tilt detection device 100 comes into contact with the wearer U is not preferable from the viewpoint of the usability of the goggles and the like.

[0084] By forming at least a part of the above-mentioned protruding portion with a light-transmissive member and propagating light in the light-transmissive member, it is possible to reduce the protrusion of the portion where the tilt detection device 100 in the goggles is arranged and prevent the tilt detection device 100 from coming into contact with the wearer U. Thereby, it is possible to achieve both the effect of preventing the displacement of the goggles and improving the usability and the effect of the tilt detection device 100.

[0085] The numbers such as ordinal numbers and quantities used in the description of the embodiments of the present invention are all exemplified for specifically explaining the technology of the present invention, and the present invention is not limited to the exemplified numbers. Further, the connection relationship between the components is exemplified for specifically explaining the technology of the present invention, and the present invention is not limited to the connection relationship that realizes the functions of the present invention.

[0086] In the tilt detection device according to the present invention, since a device capable of detecting the tilt of each of two objects can be miniaturized, it can be used for a display device, a line-of-sight depth position measuring device, an eye movement information output device, a line-of-sight direction tracking device, and the like. However, the tilt detection device according to the present invention is not limited to the above applications and can be used for various applications.

[0087] Aspects of the present invention are as follows, for example. <1> A light source including a first light emitting unit and a second light emitting unit different from the first light emitting unit, a first reflected light reflected by a first object among the lights emitted from the first light emitting unit, and a second reflected light reflected by a second object among the lights emitted from the second light emitting unit, a single light receiving unit that receives the second reflected light, and a processing unit that outputs information regarding the inclination of the first object and information regarding the inclination of the second object based on the result received by the light receiving unit. It is an inclination detection device. <2> A modulation unit that modulates the light emitted from each of the first light emitting unit and the second light emitting unit, a first modulation information of the first light emitting unit by the modulation unit, and a second modulation information of the second light emitting unit by the modulation unit. And an extraction unit that extracts information regarding the first reflected light and information regarding the second reflected light from the output signal of the light receiving unit. The processing unit outputs information regarding the inclination of the first object based on the information regarding the first reflected light, and outputs information regarding the inclination of the second object based on the information regarding the second reflected light. It is the inclination detection device according to <1>. <3> The modulation unit time-modulates the light emitted from the first light emitting unit according to a first coding pattern, and time-modulates the light emitted from the second light emitting unit according to a second coding pattern orthogonal to the first coding pattern. It is the inclination detection device according to <2>. <4> The modulation unit causes the first light emitting unit and the second light emitting unit to emit light during non-overlapping periods. It is the inclination detection device according to <2>. <5> The light source is a vertical cavity surface emitting laser. It is the inclination detection device according to any one of <1> to <4>. <6> A first central axis that intersects the direction in which the first object and the second object are arranged and passes through the center of the first object, and a second central axis that intersects the arranged direction and passes through the center of the second object, and is disposed therebetween, and has a light guiding unit that guides each of the first reflected light and the second reflected light to the light receiving unit. The tilt detection device according to any one of <1> to <5> above. <7> The light guiding unit includes a first lens that transmits the first reflected light, a second lens that transmits the second reflected light, and is disposed between the first lens and the second lens, and transmits the first reflected light that has passed through the first lens and the second reflected light that has passed through the second lens. A prism that deflects each in the direction in which the light receiving unit is located, and the first lens, the prism, and the second lens are integrally configured. The tilt detection device according to <6> above. <8> The first light emitting unit and the second light emitting unit each emit linearly polarized light, and the prism reflects the first reflected light polarized in the first direction toward the light receiving unit and transmits the second reflected light polarized in a second direction orthogonal to the first direction. A first surface, and a second surface that reflects the second reflected light polarized in the second direction toward the light receiving unit and transmits the first reflected light polarized in the first direction. The tilt detection device according to <7> above. <9> The light guiding unit is disposed between either the first reflection point of the first reflected light by the first object and the prism or the second reflection point of the second reflected light by the second object and the prism, and has a half-wave plate that rotates the polarization direction of incident linearly polarized light by 90 degrees. The tilt detection device according to <8> above. <10> A support and the tilt detection device according to any one of <1> to <9> above, wherein the first object is the right eye of the wearer of the support, and the second object is the left eye of the wearer, and is output from the tilt detection device. A display device that performs display according to the information regarding the tilt of the first object and the information regarding the tilt of the second object. <11> It has a support body and the tilt detection device according to any one of <1> to <9> above, wherein the first object is the right eye of the wearer of the support body, the second object is the left eye of the wearer, and based on the information on the tilt of the first object and the information on the tilt of the second object output from the tilt detection device, it outputs information on the depth position of the line of sight where the line of sight of the right eye and the line of sight of the left eye intersect. It is a line of sight depth position measuring device. <12> It has a support body and the tilt detection device according to any one of <1> to <9> above, wherein the first object is the right eye of the wearer of the support body, the second object is the left eye of the wearer, and based on the information on the tilt of the first object and the information on the tilt of the second object output from the tilt detection device, it outputs information on the movement of each of the right eye and the left eye. It is an eyeball movement information output device. <13> A line of sight direction tracking device that tracks the line of sight direction of a wearer, including a light source including a first light emitting part and a second light emitting part different from the first light emitting part, a first reflected light reflected by the right eye of the wearer among the light emitted from the first light emitting part, and a second reflected light reflected by the left eye of the wearer among the light emitted from the second light emitting part, and a processing part that outputs information on the line of sight direction of the right eye of the wearer and information on the line of sight direction of the left eye of the wearer based on the result received by the light receiving part. It is a line of sight direction tracking device.

Explanation of Signs

[0088] 1 Light source 11 First light emitting part 12 Second light emitting part 2 Light receiving part 3 Processing part 31 Modulation part 32 Extraction part 33 Output part 34 First tilt acquisition part 35 Second tilt acquisition part 301 CPU 302 ROM 303 RAM 304 I / F 5 Light guide section 51 First lens 52 Second lens 53 Prism 54 Half-wave plate 6 Support 61 Hanger 62 Front 7 Substrate 41 First deflection member 42 Second deflection member 43 Third deflection member 44 Fourth deflection member 100 Tilt detection device 200 Display device 210 Light guide plate 211 Half mirror 220 Control device 230 Light source unit 240 Light quantity adjuster 250 Movable device 251 Reflecting surface 300 Line-of-sight depth position measuring device 310 Line-of-sight depth position output section 400 Eye movement information output device 410 Eye movement information output section A1 Information on the tilt of the first object A2 Information on the tilt of the second object Ar Aligning direction B System bus C1 First central axis C2 Second central axis d Line-of-sight depth Dp Line-of-sight depth position E1 First object E1C Center of the first object E2 Second object E2C Center of the second object Ed Information on the line-of-sight depth position Fd Information on movement L11, L21 Light L12 First reflected light L22 Second reflected light M Scanning light Ms1 First modulation signal Ms2 Second modulation signal Mi1 First modulation information Mi2 Second modulation information P1 First reflection point P2 Second reflection point R1 Information regarding the first reflected light R11 First integrated signal R2 Information regarding the second reflected light R21 Second integrated signal S1 First surface S2 Second surface Sg Output signal T0 Period T1 First period T2 Second period U Wearer v1 First line-of-sight direction v2 Second line-of-sight direction

Prior art documents

Patent documents

[0089]

Patent Document 1

Claims

1. A light source including a first light emitting part and a second light emitting part different from the first light emitting part; One light receiving part that receives first reflected light reflected by a first object from among the light emitted from the first light emitting part and second reflected light reflected by a second object from among the light emitted from the second light emitting part; An inclination detection device having a processing part that outputs information regarding the inclination of the first object and information regarding the inclination of the second object based on the result received by the light receiving part.

2. A modulation part that modulates the light emitted from each of the first light emitting part and the second light emitting part; An extraction part that extracts information regarding the first reflected light and information regarding the second reflected light from the output signal of the light receiving part based on first modulation information of the first light emitting part by the modulation part and second modulation information of the second light emitting part by the modulation part; and The processing part outputs information regarding the inclination of the first object based on the information regarding the first reflected light and outputs information regarding the inclination of the second object based on the information regarding the second reflected light. The inclination detection device according to Claim 1.

3. The modulation part time-modulates the light emitted from the first light emitting part according to a first coding pattern and time-modulates the light emitted from the second light emitting part according to a second coding pattern orthogonal to the first coding pattern. The inclination detection device according to Claim 2.

4. The modulation part causes the first light emitting part and the second light emitting part to emit light during non-overlapping periods. The inclination detection device according to Claim 2.

5. The light source is a vertical cavity surface emitting laser. The inclination detection device according to Claim 1.

6. Between a first central axis that intersects the direction in which the first object and the second object are arranged and passes through the center of the first object, and a second central axis that intersects the arranged direction and passes through the center of the second object, and having a light guiding part that guides each of the first reflected light and the second reflected light to the light receiving part. The inclination detection device according to Claim 1.

7. The light guiding part includes A first lens that transmits the first reflected light; A second lens that transmits the second reflected light; and A prism that is disposed between the first lens and the second lens and deflects each of the first reflected light that has passed through the first lens and the second reflected light that has passed through the second lens in the direction in which the light receiving part is located. The tilt detection device according to claim 6, wherein the first lens, the prism, and the second lens are integrally formed.

8. The first light emitting unit and the second light emitting unit each emit linearly polarized light. The prism has a first surface that reflects the first reflected light polarized in the first direction toward the light receiving unit and transmits the second reflected light polarized in a second direction orthogonal to the first direction; The tilt detection device according to claim 7, further comprising a second surface that reflects the second reflected light polarized in the second direction toward the light receiving unit and transmits the first reflected light polarized in the first direction.

9. The light guiding unit is disposed either between the first reflection point of the first reflected light by the first object and the prism or between the second reflection point of the second reflected light by the second object and the prism, and has a half-wave plate that rotates the polarization direction of the incident linearly polarized light by 90 degrees. The tilt detection device according to claim 8.

10. A support body; A tilt detection device according to any one of claims 1 to 9, wherein the first object is the right eye of the wearer of the support body, the second object is the left eye of the wearer, A display device that performs display according to information regarding the tilt of the first object and information regarding the tilt of the second object output from the tilt detection device.

11. A support body; A tilt detection device according to any one of claims 1 to 9, wherein the first object is the right eye of the wearer of the support body, the second object is the left eye of the wearer, A line-of-sight depth position measurement device that outputs information regarding the line-of-sight depth position at which the line of sight of the right eye and the line of sight of the left eye intersect based on the information regarding the tilt of the first object and the information regarding the tilt of the second object output from the tilt detection device.

12. A support body; A tilt detection device according to any one of claims 1 to 9, wherein the first object is the right eye of the wearer of the support body, the second object is the left eye of the wearer, An eyeball movement information output device that outputs information regarding the movement of the right eye and the left eye based on the information regarding the tilt of the first object and the information regarding the tilt of the second object output from the tilt detection device.

13. A line-of-sight direction tracking device that tracks the line-of-sight direction of a wearer. A light source including a first light emitting unit and a second light emitting unit different from the first light emitting unit. One light receiving unit that receives a first reflected light reflected by the wearer's right eye among the light emitted from the first light emitting unit and a second reflected light reflected by the wearer's left eye among the light emitted from the second light emitting unit. A line-of-sight direction tracking device having a processing unit that outputs information regarding the line-of-sight direction of the wearer's right eye and information regarding the line-of-sight direction of the wearer's left eye based on the result received by the light receiving unit.

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