Optical system device

Abstract

The purpose of the present invention is to provide an optical system device capable of irradiation with linear light with a simple configuration.　This optical system device comprises: an optical element 2 in which lenses 21 are periodically arranged with pitches Px and Py in x and y directions, respectively; and an irradiation part 1 in which light sources 10 are arranged with pitches Qx and Qy in x and y directions, respectively. When j, k, m, and n are defined as natural numbers of 1 or more, and the focal lengths to a first focus and a second focus of the lenses 21 are defined as f1 and f2, respectively, a distance L1 between the irradiation part 1 and a first focal plane 111 of the lenses 21 satisfies expression 1, the pitch between the light sources 10 of the irradiation part 1 satisfies Qx = jPy or jQx = Px, and a distance L2 between the irradiation part 1 and a second focal plane 112 of the lenses 21 does not satisfy expression 2, or the pitch between the light sources 10 of the irradiation part 1 does not satisfy Qy = kPy and kQy = Py.

Description

optical system equipment

[0001] The present invention relates to an optical system device.

[0002] In recent years, technological developments related to virtual reality (hereinafter referred to as VR), which allows users to experience computer-generated virtual spaces as if they were real, have been actively pursued. In VR, images are viewed through a head-mounted display (hereinafter referred to as HMD) worn by the user. There is a need for HMDs to track the user's eye movements and viewpoint to provide images, and technological developments have been made for eye tracking methods and devices for this purpose. Eye tracking methods include those that measure eye movements by attaching special contact lenses to the eyes, and those that measure electrical potentials generated by muscles that move the eyes by placing electrodes around the eyes. However, these methods require the user to place contact lenses and electrodes, which are time-consuming and cumbersome. Meanwhile, methods and devices that use optical techniques to measure without directly contacting an object with the eyes have also been investigated (e.g., Patent Document 1). Optical devices for projecting dot patterns have also been proposed as optical techniques (e.g., Patent Document 2).

[0003] International Publication No. 2021 / 173276 International Publication No. 2021 / 229848

[0004] However, the device configuration is complex and expensive, and it is difficult to say that a satisfactory device has been provided yet. There is also a need for eye tracking using the light section method with a line-shaped light rather than a dot pattern. Therefore, the present invention aims to provide an optical system device that can irradiate a line-shaped light with a simple configuration.

[0005] In order to achieve the above object, the optical system of the present invention is configured such that lenses that transmit light of wavelength λ are arranged at a pitch P in the x direction. ｘ , pitch P in the y direction perpendicular to the x direction ｙ and a light source that irradiates a plurality of the lenses with light of wavelength λ is arranged at a pitch Q in the x direction. ｘ , pitch Q in the y directionｙ and an illumination unit arranged in the form of a lens, j, k, m, and n being natural numbers of 1 or more, and a focal length to a first focal point according to a cross-sectional shape of the lens perpendicular to the y direction being f １ , the focal length to the second focus according to the cross-sectional shape perpendicular to the x direction is f ２ , a plane perpendicular to the z direction including the first focal point is defined as a first focal plane, and a plane perpendicular to the z direction including the second focal point is defined as a second focal plane, the distance L between the irradiation unit and the first focal plane of the lens is defined as １ is expressed by the following formula 1 and the pitch of the light sources of the irradiation unit is Q ｘ =jp ｙ or jQ ｘ =P ｘ and the distance L between the irradiation unit and the second focal plane of the lens is ２ is expressed by the following formula 2 does not satisfy, or the pitch of the light source of the irradiation unit is Q ｙ = kP ｙ and kQ ｙ =P ｙ is characterized in that the above condition is not satisfied.

[0006] In the optical system of the present invention, the lenses that transmit light of wavelength λ are arranged at a pitch P ｘ , pitch P in the y direction perpendicular to the x direction ｙ and a light source that irradiates a plurality of the lenses with light of wavelength λ is arranged at a pitch Q in the y direction. ｙ and an illumination unit arranged in a line, wherein k, m, and n are natural numbers of 1 or more, and the focal length to the first focal point of the cross-sectional shape of the lens perpendicular to the y direction is f １ , the focal length to the second focus according to the cross-sectional shape perpendicular to the x direction is f ２ , a plane perpendicular to the z direction including the first focal point is defined as a first focal plane, and a plane perpendicular to the z direction including the second focal point is defined as a second focal plane, the distance L between the irradiation unit and the first focal plane of the lens is defined as １ is expressed by the following formula 1 and the distance L between the irradiation unit and the second focal plane of the lens is ２ is expressed by the following formula 2 does not satisfy, or the pitch of the light source of the irradiation unit is Q ｙ = kPｙ and kQ ｙ =P ｙ is characterized in that the above condition is not satisfied.

[0007] In the optical system of the present invention, the lenses that transmit light of wavelength λ are arranged at a pitch P ｘ , pitch P in the y direction perpendicular to the x direction ｙ and an irradiation unit having one light source that irradiates a plurality of the lenses with light of wavelength λ, wherein m and n are natural numbers of 1 or more, and the focal length to the first focus of the cross-sectional shape of the lens perpendicular to the y direction is f １ , the focal length to the second focus according to the cross-sectional shape perpendicular to the x direction is f ２ , a plane perpendicular to the z direction including the first focal point is defined as a first focal plane, and a plane perpendicular to the z direction including the second focal point is defined as a second focal plane, the distance L between the irradiation unit and the first focal plane of the lens is defined as １ is expressed by the following formula 1 and the distance L between the irradiation unit and the second focal plane of the lens is ２ is expressed by the following formula 2 is characterized in that the above condition is not satisfied.

[0008] Here, the distance L １ is expressed by the following formula 3 It is preferable to satisfy the following.

[0009] Here, the irradiation unit may have light sources arranged in a hexagonal array.

[0010] The device may also include an imaging unit that receives light from an object, and a calculation unit that calculates the distance to the object based on information from the imaging unit.

[0011] It is also preferable that the calculation unit is capable of calculating the distance to the object using both the light section method and the TOF method.

[0012] The optical system device of the present invention may have a plurality of the irradiation units, and may include a control unit that controls lighting of each of the irradiation units.

[0013] The optical system device of the present invention can provide an optical system device that can irradiate line-shaped light with a simple configuration.

[0014] FIG. 1 is a schematic cross-sectional view showing (a) and (b) an optical system device of the present invention, and (c) a perspective view showing a lens. FIG. 2 is a plan view showing an optical element of the present invention. FIG. 3 is a plan view showing an irradiation unit of the present invention. FIG. 4 is a diagram explaining an irradiation unit used in a simulation of the present invention. FIG. 5 is a diagram showing the lens shape of an optical element used in a simulation of the present invention. FIG. 6 is a projection diagram showing the results of a simulation of the present invention. FIG. 7 is a diagram showing the lens shape of an optical element used in an example of the present invention. FIG. 8 is a projection diagram showing the results of an example of the present invention. FIG. 9 is a schematic plan view showing an optical system device of the present invention.

[0015] The optical system device of the present invention will be described below. As shown in Fig. 1, the optical system device of the present invention is mainly composed of an optical element 2 and an irradiation unit 1. Here, if the mutually perpendicular directions are defined as the x direction, y direction, and z direction, and the optical axis direction of the optical element 2 is defined as the z direction, Fig. 1(a) is a diagram of the optical system device as viewed in the y direction, and Fig. 1(b) is a diagram of the optical system device as viewed in the x direction.

[0016] The optical element 2 has lenses 21 that transmit light of wavelength λ and are arranged at a pitch P ｘ , pitch P in the y direction perpendicular to the x direction ｙ The lens 21 has a cross-sectional shape perpendicular to the y direction, and the focal length to the first focal point is f １ , the focal length to the second focus according to the cross-sectional shape perpendicular to the x direction is f ２ In this specification, the focal length refers to the distance between the surface of lens 21 closest to the focal point and the focal point, as shown in Figure 5. Furthermore, lens 21 is disposed so that the focal point is located on the irradiation unit 1 side of lens 21. The optical element 2 of the present invention can improve contrast as the focal length f increases, such as 10 µm or more, 20 µm or more, 40 µm or more, or 60 µm or more.

[0017] The shape of the lens 21 can be freely designed to satisfy the conditions described below. For example, the shape of the lens 21 can be set to f １ = f ２ A spherical lens with f １ ≠f ２The lens 21 can be an aspherical lens having a shape such that: . Specific lens shapes include, for example, a convex lens and a concave lens. The periodic arrangement of the lenses 21 can be a quadrangular arrangement of square or rectangular lenses in a plan view as shown in FIG. 2( a), or a hexagonal arrangement of hexagonal lenses in a plan view as shown in FIG. 2( b). The lens 21 can be any lens that functions as a lens, and for example, a Fresnel lens, a DOE lens, a metalens, or the like can be used. The lens 21 is preferably provided with an anti-reflection coating that prevents reflection of light from the irradiation unit 1.

[0018] The irradiation unit 1 has a light source 10 that irradiates a plurality of lenses 21 with light of wavelength λ. As shown in FIGS. 3(a) and 3(b), the irradiation unit 1 has the light sources 10 arranged at a pitch Q in the x direction. ｘ , pitch Q in the y direction ｙ The light sources 10 may be arranged in any pattern as long as they are arranged periodically, but for example, a square pattern or a hexagonal pattern as shown in Fig. 3 may be used. In addition, as shown in Fig. 3(c), the light sources 10 are arranged at a pitch Q in the y direction in the illumination unit 1. ｙ The irradiation unit 1 may be a single light source or a plurality of light sources arranged in a row. The irradiation unit 1 may be a multiple light source configuration in which light from a single light source or a plurality of light sources passes through an aperture having a plurality of fine holes. Furthermore, when the irradiation unit 1 is configured with a plurality of light sources, it is preferable that the light sources 10 are formed on the same plane. Furthermore, the irradiation unit 1 may have only one light source 10, as shown in FIG. 3(d). Specific examples of the irradiation unit 1 include VCSELs (Vertical Cavity Surface Emitting Lasers), which are expected to achieve high output with low power. VCSELs include single-emitter VCSELs having one light source 10 that can irradiate light in a direction perpendicular to the light-emitting surface, and multi-emitter VCSELs having multiple light sources 10. Furthermore, it is preferable that a light-absorbing film is formed on the portions of the irradiation unit 1 other than the light source 10 to prevent noise due to reflected light. Furthermore, the light source 10 used in the irradiation unit 1 may be any light source that irradiates light of wavelength λ onto multiple lenses 21.

[0019] The irradiation unit 1 and the optical element 2 are arranged so that the optical axis direction of the light source 10 of the irradiation unit 1 coincides with the optical axis direction of the lens 21 of the optical element 2 .

[0020] [Positional Relationship between Irradiation Unit 1 and Optical Element 2] Next, as the irradiation unit 1, the light source 10 is arranged at a pitch Q in the x direction. ｘ , pitch Q in the y direction ｙ The positional relationship between the irradiation unit 1 and the optical element 2 will be described below in the case where j, k, m, and n are natural numbers of 1 or more, and the focal length to the first focal point of the cross-sectional shape of the lens 21 perpendicular to the y direction is f. １ , the focal length to the second focus according to the cross-sectional shape perpendicular to the x direction is f ２ In addition, a plane perpendicular to the z direction including the first focal point is defined as a first focal plane, and a plane perpendicular to the z direction including the second focal point is defined as a second focal plane. In addition, the wavelength of the light incident from the irradiation unit 1 is defined as λ. In this case, the distance L between the irradiation unit 1 and the first focal plane 111 of the lens 21 is defined as １ is expressed by the following formula α and the pitch of the light sources 10 of the irradiation unit 1 is Q ｘ =jp ｘ or jQ ｘ =P ｘ Here, a and b in formula α are coefficients indicating allowable errors, and a≦1 and b≦1 are satisfied. Furthermore, the smaller the coefficient a in formula α is, the more preferable it is, such as a=0.5, a=0.3, and a=0.1. Furthermore, the smaller the coefficient b is, the more preferable it is, such as b=0.5, b=0.3, and b=0.1. When the coefficients of formula α are a=b=1, formula α becomes formula 1 below.

[0021] In addition, the distance L between the irradiation unit 1 and the second focal plane 112 of the lens 21 ２ is expressed by the following formula β does not satisfy the above condition, or the pitch of the light source 10 of the irradiation unit 1 is ｙ = kP ｙ and kQ ｙ =P ｙ The coefficient c of formula β is c≧1, and may be c=2, c=3, or c=5. The coefficient d is also d≧1, and may be d=2, d=3, or d=5. When the coefficients of formula β are c=d=1, formula β becomes formula 2 below. By arranging the light beams in this manner, a line of light extending in the Y direction is emitted. １ , L ２ means the distance (optical path length) that light travels in a vacuum in the same time as it travels through a medium, and is expressed as the product NL, where N is the refractive index of the medium and L is the actual distance.

[0022] Here, the distance L １ It is most preferable that the following formula 3 is satisfied.

[0023] In addition, the distance L ２ does not satisfy the above formula 2, and further, Q ｙ = kP ｙ and kQ ｙ =P ｙ It is preferable to arrange them so that the above condition is not satisfied.

[0024] The light sources 10 of the irradiation unit 1 are arranged at a pitch Q in the y direction. ｙ The positional relationship between the irradiation unit 1 and the optical element 2 will be described below in the case where k, m, and n are natural numbers of 1 or more, and the focal length of the lens 21 according to the cross-sectional shape perpendicular to the y direction is f １ , the focal length of the cross-sectional shape perpendicular to the x direction is f ２ In this case, the distance L between the irradiation unit 1 and the first focal plane 111 of the lens 21 is １ are arranged so as to satisfy the above formula α. Furthermore, when the coefficients of formula α are a=b=1, formula α becomes formula 1 below.

[0025] In addition, the distance L between the irradiation unit 1 and the second focal plane 112 of the lens 21 ２ is expressed by the following formula β does not satisfy the above condition, or the pitch of the light source 10 of the irradiation unit 1 is ｙ = kP ｙ and kQ ｙ =P ｙ The coefficient c of formula β is c≧1, and may be c=2, c=3, or c=5. The coefficient d is also d≧1, and may be d=2, d=3, or d=5. When the coefficients of formula β are c=d=1, formula β becomes formula 2 below. By arranging in this way, a line of light extending in the Y direction is emitted.

[0026] Here, the distance L １ It is most preferable that the following formula 3 is satisfied.

[0027] In addition, the distance L ２ does not satisfy the above formula 2, and further, Q ｙ = kP ｙ and kQ ｙ =P ｙ It is preferable to arrange them so that the above condition is not satisfied.

[0028] In addition, the positional relationship between the irradiation unit 1 and the optical element 2 will be described in the case where the irradiation unit 1 has only one light source 10. Here, m and n are natural numbers of 1 or more, and the focal length of the lens 21 according to the cross-sectional shape perpendicular to the y direction is f １ , the focal length of the cross-sectional shape perpendicular to the x direction is f ２ In this case, the distance L between the irradiation unit 1 and the first focal plane 111 of the lens 21 is １ are arranged so as to satisfy the above formula α. Furthermore, when the coefficients of formula α are a=b=1, formula α becomes formula 1 below. are arranged so as to satisfy

[0029] In addition, the distance L between the irradiation unit 1 and the second focal plane 112 of the lens 21 ２ is expressed by the following formula β The coefficient c of formula β is c≧1, and may be c=2, c=3, or c=5. The coefficient d is also d≧1, and may be d=2, d=3, or d=5. When the coefficients of formula β are c=d=1, formula β becomes formula 2 below. By arranging in this way, a line of light extending in the Y direction is emitted.

[0030] Here, the distance L １ It is most preferable that the following formula 3 is satisfied.

[0031] [Simulation] Next, a simulation was carried out on the light intensity distribution in the far field of the optical system device of the present invention, using optical simulation software BeamPROP (manufactured by Synopsys).

[0032] The irradiation unit 1 has light sources 10 that irradiate light with a wavelength of 940 nm (λ=0.94) and a batwing light distribution as shown in FIG. 4, and the light sources 10 are arranged in a hexagonal array (Q ｘ = 40, Q ｙ The optical element 2 is composed of lenses 21 shown in FIG. ｘ is 20 μm (P ｘ = 20), P ｙ is 58 μm (P ｙ 5, the lens 21 is a rectangle with a dimension of 20 μm in the x direction and 58 μm in the y direction in a plan view, a height of 26 μm, and a focal length to the first focus of a cross section perpendicular to the y direction of 12 μm (f １ = 12), and the focal length to the second focus due to the cross-sectional shape perpendicular to the x direction is 28 μm (f ２ The refractive index of the lens was 1.53. The distance L between the irradiation unit 1 and the first focal plane 111 of the optical element 2 was １ was set to 2128 μm.

[0033] In this case, the distance L １ satisfies the above-mentioned formula 3 (m=10). ｘ =2P ｘ On the other hand, due to the difference in the distance between the first focal plane 111 and the second focal plane 112, the distance L between the irradiation unit 1 and the second focal plane 112 of the optical element 2 is ２ is 2112 μm, which does not satisfy the above-mentioned formula 2. ｙ = kP ｙ and kQ ｙ =P ｙ does not satisfy either.

[0034] The projection diagram resulting from the simulation is shown in Fig. 6. As can be seen from Fig. 6, a linear projection diagram extending in the Y direction is obtained.

[0035] [Example] The light intensity distribution of the optical system of the present invention was measured using an actual light source 10 and optical element 2.

[0036] The irradiation unit 1 has four light sources 10 emitting light with a wavelength of 940 nm (λ=0.94) and a batwing light distribution, arranged in a row (Q ｙ The optical element 2 is made up of lenses 21 shown in FIG. ｘ is 13 μm (P ｘ = 13), P ｙ is 29 μm (P ｙ 7, the lens 21 is a rectangle with a dimension of 13 μm in the x direction and 29 μm in the y direction in a plan view, a height of 24.59 μm, and a focal length to the first focus of the cross section perpendicular to the y direction of 5 μm (f １ = 5), and the focal length to the second focus due to the cross-sectional shape perpendicular to the x direction is 5 μm (f ２ The refractive index of the lens was 1.53. The distance L between the irradiation unit 1 and the first focal plane 111 of the optical element 2 was １ and the distance L to the second focal plane 112 ２ was set to 360 μm.

[0037] In this case, the distance L １ satisfies the above-mentioned formula 3 (m=4). On the other hand, the distance L ２ does not satisfy the above-mentioned formula 2. ｙ =P ｙ is met.

[0038] Figure 8 shows a projection of the optical system device at a point 22 mm ahead of the lens 21. Figures 8(1) to 8(4) are projections when each of the four light sources 10 emits light independently. Figure 8(5) is a projection when all four light sources 10 emit light. In this case, it can be seen that the light from each light source 10 overlaps to form a linear projection.

[0039] The optical system device of the present invention may also include an imaging unit 3 that receives light from an object, as shown in FIG. 9 . The imaging unit 3 detects light irradiated from the irradiation unit 1 that is reflected back from the object 9 and converts information such as its position and light intensity into digital data. The imaging unit 3 may be any device capable of detecting reflected light and converting that information into digital data, such as an existing image sensor such as a CMOS or CCD. The imaging unit 3 may also be formed on the same semiconductor chip as the irradiation unit 1. When the optical system device of the present invention is used for triangulation, the light irradiation unit 1 and the imaging unit 3 are preferably positioned at a certain distance apart in the horizontal direction. Specifically, they are preferably positioned at a distance of 3 cm or more, more preferably 5 cm or more, and even more preferably 10 cm or more. For example, the light irradiation unit 1 and the imaging unit 3 may be positioned on the left and right lenses or their edges, respectively, of glasses used for VR (virtual reality) or AR (augmented reality).

[0040] The optical system device of the present invention may further include a calculation unit 4 that calculates the distance to the object 9 based on information from the imaging unit 3. Here, the distance to the object 9 refers to the distance between the object 9 and a reference, such as the irradiation unit 1, the optical element 2, or the imaging unit 3. The calculation unit 4 may calculate the distance to the object 9 in any manner. For example, the distance between the irradiation unit 1 and the object 9 can be calculated from the time it takes for light emitted from the irradiation unit 1 to be reflected by the object 9 and received by the imaging unit 3, as in the time-of-flight (TOF) method. The distance between the irradiation unit 1 and the object 9 can also be calculated from changes in the position of a line using triangulation, as in the light-section method. Furthermore, by changing the number of illuminating units 1 of the same type, it is possible to calculate the distance from the presence or absence of a line that can be detected by the imaging unit 3 and the light intensity of the line. The distance between the irradiation unit 1 and the object 9 calculated in this manner can be used for various technologies, such as three-dimensional measurement and autofocus.

[0041] The light-section method and triangulation method calculate the distance to the object 9 by measuring an angle. Therefore, as the distance to the object 9 increases, the angle change decreases, resulting in a larger error. On the other hand, the TOF method calculates the distance between the irradiation unit 1 and the object 9 from the time it takes for light emitted from the irradiation unit 1 to be reflected by the object 9 and received by the imaging unit 3. Therefore, as the distance to the object 9 decreases, this time decreases, resulting in a larger error. Therefore, it is preferable that the calculation unit 4 be able to calculate the distance to the object 9 using both the light-section method and the TOF method. With this configuration, the results measured by the light-section method can be used when the distance to the object 9 is close, and the results measured by the TOF method can be used when the distance to the object 9 is far, thereby enabling more accurate distance measurement.

[0042] The optical system device of the present invention may also have multiple irradiation units 1. Here, if irradiation units whose light source periods in the x direction overlap are considered to be of the same type, the linear light beams emitted by the same type of irradiation units will overlap. Furthermore, if irradiation units whose light source periods in the x direction do not overlap are considered to be of different types of irradiation units, the linear light beams emitted by the different types of irradiation units will not overlap and will be shifted. Therefore, if the number of lit irradiation units of the same type can be controlled, the light intensity of the lines can be adjusted. Furthermore, if the lighting of different types of irradiation units can be switched, the position of the lines can be adjusted. Furthermore, if the number of lit irradiation units of different types can be controlled, the number of lines can also be adjusted. For this reason, the optical system device of the present invention may further include a control unit 5 that controls the lighting of each irradiation unit. Of course, the irradiation unit 1 can be configured to include both the above-mentioned different types of irradiation units and the same type of irradiation units.

[0043] The control unit 5 controls the lighting of each of the irradiation units 1. The control unit 5 may control the irradiation units 1 in any manner, but for example, it can control the lighting of each of the irradiation units 1 based on distance information calculated by the calculation unit. As a method of controlling the lighting of the irradiation units 1, for example, the number of different types of irradiation units to be turned on can be controlled so that the number of different types of irradiation units to be turned on increases as the distance to the object 9 decreases, and the number of different types of irradiation units to be turned on decreases as the distance to the object 9 increases. By controlling in this manner, when the distance to the object 9 is short, the number of lines can be increased to increase resolution, and when the distance to the object 9 is long, the number of lines can be decreased to reduce energy consumption.

[0044] Furthermore, as a method of controlling the lighting of the irradiation units 1 by another control unit 5, for example, it is also possible to control so that the number of irradiation units of the same type that are turned on decreases as the distance to the object 9 decreases, and the number of irradiation units of the same type that are turned on increases as the distance to the object 9 increases. By controlling in this way, when the distance to the object 9 is short, the light intensity of the line is reduced to reduce energy consumption, and when the distance to the object 9 is long, the light intensity of the line is increased to perform long-distance measurement.

[0045] Furthermore, as a method of controlling the lighting of the irradiation units 1 by another control unit 5, it is also possible to control the lighting of different types of irradiation units 1 in order. This changes the position of the line, and the calculation unit 4 can calculate the distance between the irradiation unit 1 and the object 9 from the change in the position of the line using triangulation.

[0046] The control unit may be any unit that can control the lighting of the light source for each irradiation unit based on information from the imaging unit 3, and for example, an existing computer, CPU, etc. may be used.

[0047] REFERENCE SIGNS LIST 1 Irradiation unit 2 Optical element 3 Imaging unit 4 Calculation unit 5 Control unit 9 Object 10 Light source 21 Lens 111 First focal plane 112 Second focal plane

Claims

1. A lens that transmits light of wavelength λ has a pitch P in the x direction. ｘ , pitch P in the y direction perpendicular to the x direction ｙ and a light source that irradiates light of wavelength λ onto a plurality of the lenses is arranged at a pitch Q in the x direction. ｘ , pitch Q in the y direction ｙ and a focal length to a first focal point according to a cross-sectional shape of the lens perpendicular to the y direction is f １ , the focal length to the second focus according to the cross-sectional shape perpendicular to the x direction is f ２ A plane perpendicular to the z direction including the first focal point is defined as a first focal plane, and a plane perpendicular to the z direction including the second focal point is defined as a second focal plane. １ is expressed by the following formula 1 and the pitch of the light source of the irradiation unit is Q ｘ =jp ｘ or jQ ｘ =P ｘ and a distance L between the irradiation unit and the second focal plane of the lens is ２ is expressed by the following formula 2 does not satisfy, or the pitch of the light source of the irradiation unit is Q ｙ = kP ｙ and kQ ｙ =P ｙ An optical system device characterized in that:

2. The lenses that transmit light of wavelength λ have a pitch P in the x direction. ｘ , pitch P in the y direction perpendicular to the x direction ｙ and a light source that irradiates light of wavelength λ onto a plurality of the lenses is arranged at a pitch Q in the y direction. ｙ and a focal length to a first focal point according to a cross-sectional shape of the lens perpendicular to the y direction is f. １ , the focal length to the second focus according to the cross-sectional shape perpendicular to the x direction is f ２ A plane perpendicular to the z direction including the first focal point is defined as a first focal plane, and a plane perpendicular to the z direction including the second focal point is defined as a second focal plane. １ is expressed by the following formula 1 and a distance L between the irradiation unit and the second focal plane of the lens is ２ is expressed by the following formula 2 does not satisfy, or the pitch of the light source of the irradiation unit is Q ｙ = kP ｙ and kQ ｙ =P ｙ An optical system device characterized in that:

3. The lenses that transmit light of wavelength λ have a pitch P in the x direction. ｘ , pitch P in the y direction perpendicular to the x direction ｙ and an irradiation unit having one light source that irradiates a plurality of the lenses with light of wavelength λ, wherein m and n are natural numbers of 1 or more, and a focal length to a first focal point according to a cross-sectional shape of the lens perpendicular to the y direction is f １ , the focal length to the second focus according to the cross-sectional shape perpendicular to the x direction is f ２ A plane perpendicular to the z direction including the first focal point is defined as a first focal plane, and a plane perpendicular to the z direction including the second focal point is defined as a second focal plane. １ is expressed by the following formula 1 and a distance L between the irradiation unit and the second focal plane of the lens is ２ is expressed by the following formula 2 An optical system device characterized in that:

4. The distance L １ is expressed by the following formula 3.

4. The optical system according to claim 1, wherein the following is satisfied:

5. The optical system device according to claim 1, wherein said illumination section has light sources arranged in a hexagonal array.

6. An optical system device according to any one of claims 1 to 3, characterized in that it comprises: an imaging unit that receives light from an object; and a calculation unit that calculates the distance to the object based on information from the imaging unit.

7. The optical system according to claim 6, wherein said calculation unit is capable of calculating the distance to said object by both the light section method and the TOF method.

8. An optical system device according to any one of claims 1 to 3, characterized in that it has a plurality of the irradiation sections, and further comprises a control section for controlling the lighting of each of the irradiation sections.

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