A light distribution structure and light distribution method for auxiliary lighting and distance measurement

Abstract

The present invention discloses a light distribution structure and a light distribution method for auxiliary lighting and ranging, wherein the light distribution structure comprises: N transmitting modules and a composite astigmatism lens for uniformly distributing incident light, wherein N≥1; the composite astigmatism lens is arranged directly above the transmitting module; the light incident surface of the composite astigmatism lens close to the transmitting module is a convex surface, and after the incident light incident to the edge of the composite astigmatism lens is refracted by the convex surface, the angle between the light and the optical axis exceeds 40°. The present invention adopts a composite astigmatism lens composed of a plurality of plano-convex lenses or a plurality of concave-convex lenses, and the maximum beam divergence angle thereof can reach 170°, thereby realizing wide-angle illumination and meeting the uniform illumination requirements of wide-angle sensors.

Description

Technical Field

[0001] The present invention relates to the technical field of auxiliary lighting distribution for videography, and in particular to a light distribution structure and a light distribution method for auxiliary lighting and distance measurement. Background Art

[0002] With the increasing popularity and rapid development of mobile terminals such as smartphones, smart watches, and wearable sensors, higher and higher requirements are placed on the detection distance and detection range of sensors. In addition to meeting the needs of ordinary video and photo taking, time-of-flight sensors (ToF), laser ranging, and virtual reality / augmented reality (AR / VAR) for 3D perception are becoming more and more popular, and the detection range is also getting wider and wider. The sensor used for 3D perception emits modulated near-infrared light from the transmitting module, which is reflected after encountering an object. The sensor calculates the time difference or phase difference between the emission and reflection of the light to convert the distance of the photographed scene to generate depth information. In addition, combined with traditional camera shooting, the three-dimensional outline of the object can be presented in the form of a topographic map with different colors representing different distances.

[0003] The existing auxiliary lighting and uniform light distribution devices for mobile terminal 3D time-of-flight sensors and 2D camera sensors generally adopt a light distribution method similar to that of a fly-eye lens / compound-eye lens. For example, patent CN208794326U discloses a high-efficiency flash lens module technology with uniform light distribution, and its structure is as follows: Figure 1 As shown, it includes a light emitter, a collimating lens mounted above the light emitter for collimating light, a modulator mounted above the collimating lens for uniform light distribution, the collimating lens is a ring-shaped total reflection collimating Fresnel lens, the collimating lens includes an aspheric collimating surface arranged in the middle, a plurality of circles of reflecting prisms surrounding the aspheric collimating surface, and the reflecting prism includes a conical incident surface arranged on one side of the reflecting prism and a total reflection surface arranged on the other side of the reflecting prism. This technology can form a uniform light spot that just covers the field of view of the camera lens, improve the efficiency of light energy utilization, and solve the problems of light spot shape and color temperature uniformity. Moreover, the human eye cannot see the shape and arrangement of the light emitting device under the lens directly, which improves the aesthetics. However, since the microlens array modulator in the patent is composed of a plurality of double convex lenses, the structure of the double convex optical surface limits the output light beam divergence angle, and its maximum divergence angle can only be within 90 degrees. For a larger divergence angle, this structure cannot meet the requirements. With the development of the industry, the demand for the field of view of the camera is increasing, and the microlens array modulator with a double convex optical surface structure cannot meet the needs. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the above prior art and to provide a wide-angle light distribution structure and a light distribution method for auxiliary lighting and ranging.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A light distribution structure for auxiliary lighting and ranging, characterized in that it includes: N transmitting modules and a composite astigmatism lens for uniformly distributing incident light, N≥1; the composite astigmatism lens is arranged directly above the transmitting module; the light incident surface of the composite astigmatism lens close to the transmitting module is a convex surface, and after the incident light incident on the edge of the composite astigmatism lens is refracted by the convex surface, the angle between the light and the optical axis exceeds 40°.

[0007] Preferably, the light distribution curved surface of the composite astigmatism lens is a symmetrical curved surface with the same contour lines in the XY direction or a free-form curved surface with different contour lines in the XY direction, wherein the light distribution curved surface is a convex surface.

[0008] Preferably, the emission module comprises: an infrared vertical high intensity surface emitting laser diode and a substrate; the infrared vertical high intensity surface emitting laser diode is arranged on the upper surface of the substrate.

[0009] Preferably, the vertical cavity surface emitting laser diode is formed by arranging multiple vertical cavity emitting laser diodes, and the vertical cavity surface emitting laser diodes are any one of a square arrangement, a hexagonal arrangement, a circular arrangement, a staggered arrangement, or a pseudo-random array, and the output wavelength of the vertical cavity surface emitting laser diode is 650 to 1500nm.

[0010] Preferably, the composite astigmatism lens comprises: K concave-convex lens units, K>1; wherein the light incident surface of the concave-convex lens unit close to the emission module is a convex surface, and the light emitting surface above the concave-convex lens unit is a concave surface.

[0011] Preferably, the maximum light distribution angle of each concave-convex lens unit is 170°, and the light spots output by the concave-convex lens units after light distribution overlap with each other to form a uniform light spot distribution in a large-angle rectangular shape after superposition.

[0012] Preferably, the material of the composite astigmatism lens is liquid silicone LSR or infrared plastic, and the infrared plastic is any one of infrared PMMA, PP, PS, PA, PC, PE, ABS and K26R.

[0013] Preferably, the light beam emitted by the vertical cavity surface emitting laser diode is first converged by the convex surface of the concave-convex lens unit, and then intersects near the concave surface. The concave surface diffuses the light to form a spot distribution with a full beam angle of 2ψ.

[0014] Preferably, the composite astigmatism lens comprises: L plano-convex lens units, L>1; wherein the light incident surface of the plano-convex lens unit close to the emission module is a convex surface, and the light emitting surface of the plano-convex lens unit is a plane.

[0015] Preferably, the maximum light distribution angle of the multiple plano-convex lens units can also reach 170 degrees.

[0016] Preferably, the plurality of plano-convex lens units are arranged in a square shape.

[0017] Preferably, a plurality of plano-convex lens units evenly distribute the light emitted by the vertical cavity surface emitting laser diode, and the light spots output by each plano-convex lens unit after light distribution overlap with each other to form a uniform light spot distribution in a large-angle rectangular shape after superposition.

[0018] Preferably, the light beam emitted by the vertical cavity surface emitting laser diode is first converged after passing through the light incident surface of the plano-convex lens unit, and then intersects near the plane of the plano-convex lens unit. The plane diffuses the incident light beam to form a spot distribution with a full beam angle of 2ψ.

[0019] Preferably, the emission module comprises: a light emitting diode and a condensing lens, and the condensing lens is arranged between the light emitting diode and the composite diffusing lens.

[0020] Preferably, the light emitting diode is an infrared LED or a visible light LED.

[0021] Preferably, the focusing lens is a flat plate lens, and the flat plate lens is any one of a sawtooth Fresnel lens, a concentric ring-shaped zone plate lens, and a diffractive optical lens.

[0022] Preferably, the light beam incident from the sawtooth Fresnel lens is first converged by the light incident surface of the concave-convex lens unit, and then intersects near the concave surface of the concave-convex lens unit. The concave surface diffuses the light, and after diffusion, a spot distribution with a full beam angle of 2ψ is formed.

[0023] Preferably, the light beam incident from the sawtooth Fresnel lens is first converged through the light incident surface of the plano-convex lens unit, and after convergence, intersects near the plane of the plano-convex lens unit, and the plane output light beam forms a spot distribution with a full angle of 2ψ.

[0024] Preferably, the focusing lens is an aspherical lens, and the light emitting diode is a chip LED.

[0025] Preferably, the concave surface and the convex surface of the meniscus lens unit have contour lines with different curvatures in both the X and Y directions.

[0026] Preferably, the light distribution curved surface of the plano-convex lens unit is a free-form surface with different contour lines in the XY directions, and the light distribution curved surface is a concave surface.

[0027] Preferably, the combination arrangement of the composite astigmatism lenses is any one of quadrilateral, hexagonal, circular, staggered and random arrangement;

[0028] Preferably, the shape of the composite astigmatism lens is any one of a square, a rounded quadrilateral, an ellipse, a circle, and a polygon.

[0029] Preferably, the emission module is a white light vertical high intensity surface emitting laser diode and a substrate; the white light vertical high intensity surface emitting laser diode is a white light laser single chip module or a white light laser array multi-chip module, and the color temperature of the white light is 3500 to 15000K.

[0030] Preferably, the light source module and the compound astigmatism lens are separately provided or the light source module and the compound astigmatism lens are combined into an integrated module.

[0031] Preferably, the infrared vertical strong surface emitting laser is an infrared laser single chip module or an infrared laser array multi-chip module.

[0032] Preferably, the wavelength of the infrared light is 650 to 1500 nm, and the full angle of the light beam of the light source output by the infrared laser single-chip module or the infrared laser array multi-chip module is between 5 and 40 degrees.

[0033] An application of the above-mentioned light distribution structure for auxiliary lighting and ranging, the light distribution structure is used for auxiliary lighting and uniform light distribution of a 3D time-of-flight sensor and a 2D camera sensor of a mobile terminal.

[0034] The purpose of the present invention is also achieved through the following technical solutions:

[0035] A light distribution method for auxiliary lighting and ranging, comprising:

[0036] The transmitting module outputs the incident light to the compound astigmatism lens. After the convex surface of the compound astigmatism lens refracts and distributes the incident light, a first refracted light is obtained. The first refracted light is refracted by the light-emitting surface of the compound astigmatism lens to output a second refracted light.

[0037] Preferably, the vertical cavity surface emitting laser diode outputs the incident light, and when the incident edge light RS is refracted and distributed by the convex surface of a single concave-convex lens unit, the maximum angle δ° between the refracted light ST and the optical axis OZ is obtained, δ>40°; after the light ST is output through the concave surface, the maximum distribution angle ψ between the output light TU and the optical axis OZ is obtained, ψ>sin -1 (n*sin(δ)), where n is the refractive index of the infrared material of the concave-convex lens unit, and the concave surface is the secondary light distribution surface, which plays the role of beam expansion again.

[0038] Preferably, the refractive index is n=1.49, δ=40°, and the maximum light distribution angle ψ between the output light TU passing through the concave surface of the meniscus lens unit and the optical axis OZ is greater than 73.28.

[0039] Preferably, the vertical cavity surface emitting laser diode outputs the incident light, and when the incident edge light RS is refracted and distributed by the convex surface of a single plano-convex lens unit, the maximum angle δ° between the refracted light ST and the optical axis OZ is obtained, δ>40°; after the light ST is output through the light exit surface, the maximum distribution angle ψ between the output light TU and the optical axis OZ is obtained, ψ>sin -1 (n*sin(δ)), where n is the refractive index of the infrared material of the plano-convex lens unit.

[0040] Preferably, the refractive index is n=1.49, δ=40°, and the maximum light distribution angle ψ between the output light TU passing through the plane of the plano-convex lens unit and the optical axis OZ is greater than 73.28.

[0041] Preferably, the light beam emitted by the LED light source is converged by a sawtooth Fresnel lens; the converged light is then distributed by a compound astigmatism lens, and the light spots output by each concave-convex lens unit in the compound astigmatism lens after distribution overlap with each other to form a uniform light spot distribution after superposition.

[0042] Preferably, the light beam emitted by the LED light source is converged by the sawtooth Fresnel lens; the converged light is then converged by the convex surface of the plano-convex lens unit, and the converged light intersects with the plane of the plano-convex lens unit.

[0043] Preferably, the light beam emitted by the patch LED light source is converged by an aspheric lens; the converged light then passes through a compound astigmatism lens for light distribution, and the light spots output by each concave-convex lens unit after light distribution overlap with each other, and after superposition, a uniform light spot distribution in a large-angle rectangular shape is formed.

[0044] The present invention has the following advantages over the prior art:

[0045] The present invention adopts a composite astigmatism lens composed of multiple plano-convex lenses or multiple concave-convex lenses, and its beam divergence angle can reach up to 170°, realizing wide-angle illumination, and can meet the uniform illumination requirements of wide-angle (fisheye) sensors. The side of the concave-convex lens unit or the plano-convex lens unit close to the emission source is a convex surface, and the incident light at its edge is refracted by the convex surface, and the angle between it and the optical axis exceeds 40°. After being refracted by the concave surface or plane surface of the light emitting surface, its maximum light distribution angle (full angle) can reach 170°. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0047] Figure 1 The structure diagram of an existing high-efficiency flash lens module with uniform light distribution is shown.

[0048] Figure 2 It is a cross-sectional view of the light distribution structure of Example 1.

[0049] Figure 3 It is an isometric front exploded view of the light distribution structure of Example 1.

[0050] Figure 4 It is an isometric rear exploded view of the light distribution structure of Example 1.

[0051] Figure 5 Schematic diagram of light distribution of the light distribution structure of Example 1.

[0052] Figure 6 Schematic diagram of light distribution of a single concave-convex lens unit in Example 1.

[0053] Figure 7 Schematic diagram of the light distribution angle of the edge light of a single concave-convex lens unit in Example 1.

[0054] Figure 8 This is a light distribution simulation diagram of the light distribution structure of Example 1.

[0055] Fig. 9 This is a simulation diagram of the irradiance distribution of the light distribution structure of Example 1 at a distance of 500 mm.

[0056] Fig.10 It is a cross-sectional view of the light distribution structure of Example 2.

[0057] Fig.11 Schematic diagram of light distribution of the light distribution structure of Example 2.

[0058] Fig.12 Schematic diagram of light distribution of a single plano-convex lens unit in Example 2.

[0059] Fig.13 Schematic diagram of the light distribution angle of the edge light of a single plano-convex lens unit in Example 2.

[0060] Fig.14 It is a cross-sectional view of the light distribution structure of Example 3.

[0061] Fig.15 Schematic diagram of light distribution of the light distribution structure of Example 3.

[0062] Fig.16 Schematic diagram of light distribution of a single concave-convex lens unit in Example 3.

[0063] Fig.17 Schematic diagram of the light distribution angle of the edge light of a single concave-convex lens unit in Example 3.

[0064] Fig.18 It is a cross-sectional view of the light distribution structure of Example 4.

[0065] Fig.19 Schematic diagram of light distribution of the light distribution structure of Example 4.

[0066] Fig. 20 Schematic diagram of light distribution of a single plano-convex lens unit in Example 4.

[0067] Fig.21 Schematic diagram of the light distribution angle of the edge light of a single plano-convex lens unit in Example 4.

[0068] Fig. 22 Schematic diagram of light distribution of the light distribution structure of Example 5.

[0069] Fig.23 Schematic diagram of light distribution of the light distribution structure of Example 6.

[0070] Fig.24 Schematic diagram of light distribution of the light distribution structure of Example 7.

[0071] Fig.25 It is an isometric view from above of the concave-convex composite lens unit of Example 7.

[0072] Fig.26 This is a bottom isometric view of the concave-convex composite lens unit of Example 7.

[0073] Fig. 27 Schematic diagram of light distribution of the light distribution structure of Example 8.

[0074] Fig.28 This is a bottom isometric view of the plano-convex composite lens unit of Example 8.

[0075] Fig.29 (a) is a schematic diagram of a square arrangement of compound astigmatism lenses.

[0076] Fig.29 (b) is another schematic diagram of a square arrangement of compound astigmatism lenses.

[0077] Fig.29 (c) is a schematic diagram of the hexagonal arrangement of the compound astigmatism lens.

[0078] Fig.29 (d) is a schematic diagram of the circular arrangement of compound astigmatism lenses. DETAILED DESCRIPTION

[0079] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0080] Embodiment 1:

[0081] The light distribution structure of this embodiment is composed of a substrate 130, an infrared vertical strong surface emitting laser diode (VCSEL) 110, and a composite astigmatism lens 120, and can be used for auxiliary lighting and uniform light distribution of a 3D time-of-flight sensor and a 2D camera sensor of a mobile terminal. The cross-sectional view of the light distribution structure of this embodiment is shown in FIG. Figure 2 As shown, the isometric side view exploded view is as follows Figure 3 As shown, the isometric rear view exploded view is as follows Figure 4 As shown. The vertical cavity surface emitting laser diode (VCSEL) 110 is composed of multiple vertical cavity emitting laser diodes arranged in a square arrangement, and the emission wavelength is 940nm. The beam angle of the infrared vertical strong surface emitting laser diode (VCSEL) 110 is between 15° and 60°. The parameters of the infrared vertical strong surface emitting laser diode (VCSEL) 110 refer to Table 1. The length L of the vertical cavity surface emitting laser VCSEL array is 972μm, the width W is 680μm, the effective emission surface length A is 479μm, the effective emission surface width B is 575μm, the lateral spacing Px of the emission points is 52μm, the longitudinal spacing Py of the emission points is 30.5μm, and the emission point diameter 11μm, number of emission points: 361, full emission angle: 24°×18°.

[0082] Table 1: Parameters of vertical cavity surface emitting laser VCSEL array 5

[0083]

[0084] The composite astigmatism lens 120 is composed of a plurality of concave-convex lens units arranged in a square arrangement. The light incident surface of the concave-convex lens unit below the light source is a convex surface, and the light emitting surface above the concave surface is a concave surface. Figure 5 As shown. The concave-convex lens unit is used to evenly distribute the light emitted by the VCSEL array at a large angle, and the maximum light distribution angle of the concave-convex lens unit is 170°. The light spots output by each concave-convex lens unit after light distribution overlap with each other, and after superposition, a large-angle rectangular uniform light spot distribution is formed.

[0085] The material of the composite astigmatism lens 120 is high temperature resistant, infrared transparent liquid silicone LSR, or infrared plastic such as infrared PMMA (polymethyl methacrylate), PP (polypropylene), PS (polystyrene), PA (polyamide), PC (polycarbonate), PE (polyethylene), ABS (acrylonitrile, butadiene, styrene terpolymer), K26R (COC optical plastic of Japan Zeon), etc., without specific limitation here.

[0086] The light distribution of a single concave-convex lens unit 120 in the composite astigmatism lens is as follows: Figure 6As shown in the figure, 110 is a VCSEL light source, 121 is a light incident surface of a single concave-convex lens unit, which is a convex surface and a main light distribution surface; 122 is a light exit surface of a single concave-convex lens unit, which is a concave surface and a secondary light distribution surface, which plays a role of beam expansion again. The light beam emitted from the VCSEL first converges through the light incident surface 121, and then intersects near the concave surface 122 after convergence.

[0087] The light incident surface 121 of the concave-convex lens unit satisfies the following light distribution conditions: when the incident edge light RS is refracted and distributed through the curved surface 121 of a single concave-convex lens unit, the maximum angle δ between the refracted light ST and the optical axis OZ is greater than 40°. After the light ST is output through the light output surface 122, the maximum light distribution angle ψ between the output light TU and the optical axis OZ is greater than sin -1 (n*sin(δ)), where n is the refractive index of the infrared material. Assuming the refractive index is n=1.49, δ=40°, the maximum light distribution angle ψ between the output light TU and the optical axis OZ is greater than 73.28°. The concave surface 122 is a secondary light distribution surface, which plays the role of beam expansion again, further expanding the beam angle of the outgoing light. The maximum light distribution angle ψ of this embodiment is 85° (the full beam angle 2ψ is 170°). The concave surface 122 diffuses the incident light, and after diffusion, a spot distribution with a full beam angle of 2ψ is formed.

[0088] The angle relationship between the incident light and the outgoing light at the edge of a single concave-convex lens unit 12 is as follows: Figure 7 As shown. In the figure, OZ is the optical axis passing through the center of a single concave-convex lens unit 120, and point O is located on the light-emitting surface of the VCSEL; RS is the incident light passing through the edge of the concave-convex lens unit 120, where point S is located above the edge of the convex surface 121, and the angle between RS and the optical axis OZ is θ. The maximum angle θ between RS and the optical axis OZ is the maximum beam angle of the vertical cavity surface emitting laser diode VCSEL, and the angle θ of Example 1 is 12° (the maximum emission angle of the wig VCSEL is 24°).

[0089] Figure 8 and Fig. 9 The computer simulation results of the composite astigmatism lens of this embodiment and the simulation results of the irradiance distribution at a distance of 500 mm are shown respectively. Fig. 9 It can be seen that at a distance of 500mm, the light spot is rectangular, and within a range of 1.4 meters by 1 meter, the uniformity of its irradiance distribution exceeds 60%. This can meet the uniformity distribution requirements of the time-of-flight sensor (ToF) within this range.

[0090] Example 2

[0091] The cross-sectional view of the light distribution structure of this embodiment is as follows: Fig.10As shown, it is composed of a substrate 230, an infrared vertical strong surface emitting laser diode (VCSEL) 210, and a composite astigmatism lens 220. The light distribution structure of this embodiment can be used for auxiliary lighting and uniform light distribution of 3D flight time sensors and 2D camera sensors of mobile terminals. The composite astigmatism lens 220 is composed of a plurality of plano-convex lens units, and the arrangement of the plurality of plano-convex lens units is a square arrangement. The side of the plano-convex lens unit close to the emission source (210) is a convex surface. After the edge incident light is refracted by the convex surface, the angle between it and the optical axis exceeds 40°. The maximum light distribution angle of the composite astigmatism lens 220 can reach 170 degrees to meet the uniform illumination requirements of wide-angle (fisheye) sensors. The infrared vertical strong surface emitting laser diode (VCSEL) 210 is composed of a plurality of vertical cavity emitting laser diodes arranged in a square arrangement, with an emission wavelength of 940nm, and a beam angle between 15° and 60°. Its parameters are consistent with those of Example 1. Please refer to Table 1.

[0092] The material of the composite astigmatism lens 120 is high temperature resistant, infrared transparent liquid silicone LSR, or infrared plastic such as infrared PMMA (polymethyl methacrylate), PP (polypropylene), PS (polystyrene), PA (polyamide), PC (polycarbonate), PE (polyethylene), ABS (acrylonitrile, butadiene, styrene terpolymer), K26R (COC optical plastic of Japan Zeon), etc.

[0093] The light distribution method of the light distribution structure of this embodiment is as follows: Fig.11 As shown. Multiple plano-convex lens units evenly distribute the light emitted by the VCSEL array at a large angle, with the maximum light distribution angle being 170°. The light spots output by each plano-convex lens unit after light distribution overlap with each other, and after superposition, a large-angle rectangular uniform light spot distribution is formed.

[0094] The light distribution of a single plano-convex lens unit 220 is as follows: Fig.12 As shown. In the figure, 210 is a VCSEL light source, 221 is the light incident surface of a single plano-convex lens unit, which is a convex surface; 222 is the light exit surface of a single plano-convex lens unit, which is a plane. The light beam emitted from the VCSEL first converges after passing through the light incident surface 221, and then intersects near the plane 222 after convergence. The plane 222 diffuses the incident light, and after diffusion, a light spot distribution with a full angle of the beam angle of 2ψ is formed. For a single plano-convex lens unit 220, the light incident surface 221 is the main light distribution surface, and the light exit surface 222 is a plane, which has no light distribution function.

[0095] The angle relationship between the incident light and the outgoing light at the edge of a single plano-convex lens unit 220 is as follows: Fig.13As shown. In the figure, OZ is the optical axis passing through the center of a single plano-convex lens unit 220, and point O is located on the light-emitting surface of VCSEL210; RS is the incident light passing through the edge of the plano-convex lens unit 220, where point S is located above the edge of the convex surface 221, and the angle between RS and the optical axis OZ is θ. The maximum angle θ between RS and the optical axis OZ is the maximum beam angle of the vertical cavity surface emitting laser diode VCSEL. In embodiment 2, the angle θ is preferably 12° (assuming that the maximum emission angle of VCSEL is 24°).

[0096] The light incident surface (convex surface) 221 satisfies the following light distribution conditions: when the incident edge light RS is refracted and distributed through the curved surface 221 of a single plano-convex lens unit, the maximum angle δ between the refracted light ST and the optical axis OZ is greater than 40°. After the light ST is output through the light output surface 222, the maximum light distribution angle ψ between the output light TU and the optical axis OZ is greater than sin -1 (n*sin(δ)), where n is the refractive index of the infrared material. Assuming the refractive index is n=1.49 and δ=40°, the maximum light distribution angle ψ between the output light TU and the optical axis OZ is greater than 73.28°. Plane 222 is the output surface and has no light distribution effect. The maximum light distribution angle ψ of Example 2 is 85° (the full beam angle 2ψ is 170°)

[0097] The applications of Examples 1 and 2 are emission modules for time-of-flight optical ranging of 2D and 3D imaging. The light sources are VCSEL infrared laser single-chip modules and VCSEL infrared laser array multi-chip modules, respectively. The wavelength of the infrared chip is 650-1500nm, and the full angle of the light source beam is between 5-40 degrees.

[0098] Example 3

[0099] The cross-sectional view of this embodiment is as follows Fig.14As shown. The light distribution structure of this embodiment is composed of a large-angle LED light source 310, a flat lens 320, and a compound astigmatism lens 330. The light distribution structure of this embodiment can be used for auxiliary lighting and uniform light distribution of 3D time-of-flight sensors and 2D camera sensors of mobile terminals. The LED light source is an infrared LED or a visible light LED. The LED light source 310 has a large light-emitting surface, generally more than 1mmx1mm. At the same time, it has a large beam angle, generally a Lambertian distribution of about 120°. The compound astigmatism lens is composed of a plurality of concave-convex lens units. The arrangement of the plurality of concave-convex lens units is a square arrangement. The light incident surface below the concave-convex lens unit close to the flat lens 320 is a convex surface, and the light emitting surface above it is a concave surface. After the edge incident light is refracted by the convex surface, the angle with the optical axis exceeds 40°. The maximum light distribution angle of the compound astigmatism lens can reach 170 degrees, which can meet the uniform illumination requirements of wide-angle (fisheye) sensors. The flat lens 320 is a sawtooth Fresnel lens, which converges the light beams emitted by the LED.

[0100] The material of the composite astigmatism lens 330 is high temperature resistant, infrared transparent liquid silicone LSR, or infrared plastic such as infrared PMMA (polymethyl methacrylate), PP (polypropylene), PS (polystyrene), PA (polyamide), PC (polycarbonate), PE (polyethylene), ABS (acrylonitrile, butadiene, styrene terpolymer), K26R (COC optical plastic of Japan Zeon), etc.

[0101] The light distribution method of the light distribution structure in Example 3 is as follows Fig.15 As shown. The light beam emitted by the large-angle LED light source 310 is converged by the sawtooth Fresnel lens 320. The converged light is then distributed by the compound astigmatism lens 330, and its maximum distribution angle is 170°. The light spots output by each concave-convex lens unit after light distribution overlap with each other, and after superposition, a uniform light spot distribution of a large-angle rectangular shape is formed.

[0102] The light distribution of a single concave-convex lens unit 330 is as follows: Fig.16 As shown. In the figure, 331 is the light incident surface of a single concave-convex lens unit, which is a convex surface; 332 is the light exit surface of a single concave-convex lens unit, which is a concave surface. The light beam incident from the sawtooth Fresnel lens 320 is first converged through the light incident surface 331, and then intersects near the concave surface 332. The concave surface 332 diffuses the incident light, and after diffusion, a spot distribution with a full angle of the beam angle of 2ψ is formed. The light incident surface 331 is the main light distribution surface, and the light exit surface 332 is the secondary light distribution surface, which plays the role of re-expanding the beam.

[0103] In the single concave-convex lens unit 330 of Example 3, the angle relationship between the edge incident light and the outgoing light is as follows: Fig.17In the figure, OZ is the optical axis passing through the center of a single concave-convex lens unit 330, RS is the incident light passing through the edge of the concave-convex lens unit 330, wherein point S is located above the edge of the convex surface 331, and RS is parallel to the optical axis OZ.

[0104] The light incident surface 331 satisfies the following light distribution conditions: when the incident edge light RS is refracted and distributed by the curved surface 331 of a single concave-convex lens unit, the maximum angle δ between the refracted light ST and the optical axis OZ is greater than 40°. After the light ST is output through the light output surface 332, the maximum light distribution angle ψ between the output light TU and the optical axis OZ is greater than sin -1 (n*sin(δ)), where n is the refractive index of the infrared material. Assuming the refractive index is n=1.49 and δ=40°, the maximum light distribution angle ψ between the output light TU and the optical axis OZ is greater than 73.28°. The concave surface 332 is a secondary light distribution surface, which plays a role of beam expansion, further expanding the beam angle of the outgoing light. The maximum light distribution angle ψ of Example 3 is 85° (the full beam angle 2ψ is 170°).

[0105] Embodiment 4:

[0106] The cross-sectional view of the light distribution structure of Example 4 is as follows Fig.18 As shown, it is composed of an LED light source 410, a flat lens 420, and a compound astigmatism lens 430. The light distribution structure of this embodiment can be used for auxiliary lighting and uniform light distribution of 3D time-of-flight sensors and 2D camera sensors of mobile terminals. The large-angle LED light source is an infrared LED or a visible light LED. The LED light source 410 has a large light-emitting surface, generally more than 1mmx1mm. At the same time, it has a large beam angle, generally a Lambertian distribution of about 120°. The compound astigmatism lens 420 is composed of a plurality of plano-convex lens units, and the arrangement of the plurality of plano-convex lens units is a square arrangement. The light incident surface below the plano-convex lens unit close to the flat lens 420 is a convex surface, and the light exiting surface above it is a plane. After the edge incident light is refracted by the convex surface, the angle with the optical axis exceeds 40°. The maximum light distribution angle of the compound astigmatism lens 430 can reach 170 degrees, which can meet the uniform illumination requirements of wide-angle (fisheye) sensors. The flat lens 420 is a sawtooth Fresnel lens, which converges the light beams emitted by the LED.

[0107] The composite astigmatism lens 430 is made of high temperature resistant, infrared transparent liquid silicone LSR, or infrared plastic such as infrared PMMA (polymethyl methacrylate), PP (polypropylene), PS (polystyrene), PA (polyamide), PC (polycarbonate), PE (polyethylene), ABS (acrylonitrile, butadiene, styrene terpolymer), K26R (COC optical plastic of Japan Zeon), etc.

[0108] The light distribution method of the light distribution structure of Example 4 is as follows Fig.19 As shown. The light beam emitted by the large-angle LED light source 410 is converged by the sawtooth Fresnel lens 420. The converged light is then distributed by the compound astigmatism lens 430, and its maximum distribution angle is 170°. The light spots output by each concave-convex lens unit after light distribution overlap with each other, and after superposition, a uniform light spot distribution of a large-angle rectangular shape is formed.

[0109] The light distribution of a single plano-convex lens unit 430 is as follows: Fig. 20 As shown. In the figure, 431 is the light incident surface of a single plano-convex lens unit, which is a convex surface; 432 is the light exit surface of a single plano-convex lens unit, which is a plane. The light beam incident from the sawtooth Fresnel lens 420 is first converged through the light incident surface 431, and then intersects near the plane 432. The plane 432 only serves as an output surface, and its output light beam forms a spot distribution with a full angle of 2ψ. The light incident surface 431 is the main light distribution surface, and the light exit surface 432 is a plane, which does not play any light distribution role.

[0110] The angle relationship between the incident light and the outgoing light at the edge of a single plano-convex lens unit 430 is as follows: Fig.21 In the figure, OZ is the optical axis passing through the center of a single plano-convex lens unit 430, RS is the incident light passing through the edge of the plano-convex lens unit 430, wherein point S is located above the edge of the convex surface 431, and RS is parallel to the optical axis OZ.

[0111] The light incident surface 431 satisfies the following light distribution conditions: when the incident edge light RS is refracted and distributed by the curved surface 431 of a single plano-convex lens unit, the maximum angle δ between the refracted light ST and the optical axis OZ is greater than 40°; after the light ST is output through the light exiting surface 432, the maximum light distribution angle ψ between the output light TU and the optical axis OZ is greater than sin -1 (n*sinin(δ)), where n is the refractive index of the infrared material. Assuming the refractive index is n=1.49, δ=40°, the maximum light distribution angle ψ between the output light TU and the optical axis OZ is greater than 73.28°. Plane 432 is the output surface, which has no light distribution effect, and the beam angle of the outgoing light is ψ. The maximum light distribution angle ψ of Example 4 is 85° (the full beam angle 2ψ is 170°).

[0112] Example 5

[0113] The light distribution structure of this embodiment can be used for auxiliary lighting and uniform light distribution of 3D time-of-flight sensors and 2D camera sensors of mobile terminals. In addition to being mainly used for 2D and 3D imaging time-of-flight ranging of smartphones, it can also be applied to 2D and 3D imaging time-of-flight ranging of network cameras, 2D and 3D imaging time-of-flight ranging of face recognition, 2D and 3D imaging time-of-flight ranging of computer cameras, 2D and 3D imaging time-of-flight ranging of smart TVs, 2D and 3D imaging time-of-flight ranging of security monitoring, 2D and 3D imaging time-of-flight ranging of intelligent car assisted driving system cameras, 2D and 3D imaging time-of-flight ranging of sweeping robot objects, 2D and 3D imaging time-of-flight ranging of gesture action recognition, 2D and 3D imaging time-of-flight ranging of game consoles, and 2D and 3D imaging time-of-flight ranging of intelligent door lock cameras. For these fields, the thickness requirement of the module is not so high, and it can be appropriately thickened. Considering the production cost of the module, the flat lens of Example 5 can be changed to a non-spherical lens with lower production cost, and the light source is set to a large-angle patch LED, that is, the light distribution structure of Example 5 is composed of an LED light source 510, an aspherical lens 520, and a compound astigmatism lens 530. The LED light source 510 has a large light-emitting surface, generally more than 1mmx1mm. At the same time, it has a large beam angle, generally a Lambertian distribution of about 120°. The upper and lower surfaces of the aspherical lens 52 are aspherical, which converges the light beam emitted by the LED. The compound astigmatism lens 530 is composed of a plurality of concave-convex lens units, and the arrangement of the plurality of concave-convex lens units is a square arrangement. The light incident surface below the concave-convex lens unit close to the flat lens 520 is a convex surface, and the light emitting surface above it is a concave surface.

[0114] The material of the composite astigmatism lens 530 is high temperature resistant, infrared transparent liquid silicone LSR, or infrared plastic such as infrared PMMA (polymethyl methacrylate), PP (polypropylene), PS (polystyrene), PA (polyamide), PC (polycarbonate), PE (polyethylene), ABS (acrylonitrile, butadiene, styrene terpolymer), K26R (COC optical plastic of Japan Zeon), etc.

[0115] The light distribution method of the light distribution structure of Example 5 is as follows Fig. 22 As shown in the figure, the light beam emitted from the wide-angle LED light source 510 is converged by the aspheric lens 520. The converged light is then distributed by the compound astigmatism lens 530, and its maximum distribution angle is 170°. The light spots output by each concave-convex lens unit after light distribution overlap with each other, and after superposition, a uniform light spot distribution of a wide-angle rectangular shape is formed.

[0116] Example 6

[0117] The light distribution structure of this embodiment is composed of an LED light source 610, an aspheric lens 620, and a compound astigmatism lens 630, and can be used for 3D time-of-flight sensors and 2D camera sensors of mobile terminals. For computer games, AR / VB, intelligent car assisted driving systems, drones, sweeping robots, smart door locks and other applications, the size requirements of the module are not so stringent, and the focusing lens adopts an aspheric lens 620, and the upper and lower surfaces of the aspheric lens 620 are both aspheric surfaces, which converge the light beams emitted by the LED. The compound astigmatism lens 630 is composed of a plurality of plano-convex lens units, and the arrangement of the plurality of plano-convex lens units is a square arrangement. The plano-convex lens unit, the light incident surface below close to the flat lens 620 is a convex surface, and the light exiting surface above is a plane. After the edge incident light is refracted by the convex surface, the angle between it and the optical axis exceeds 40°. The maximum light distribution angle of the compound astigmatism lens 630 can reach 170 degrees, which can meet the uniform illumination requirements of the wide-angle (fisheye) sensor. The LED light source 610 has a relatively large light emitting surface, generally larger than 1 mm x 1 mm, and a relatively large beam angle, generally a Lambertian distribution of about 120°.

[0118] The material of the composite astigmatism lens 630 is high temperature resistant, infrared transparent liquid silicone LSR, or infrared plastic such as infrared PMMA (polymethyl methacrylate), PP (polypropylene), PS (polystyrene), PA (polyamide), PC (polycarbonate), PE (polyethylene), ABS (acrylonitrile, butadiene, styrene terpolymer), K26R (COC optical plastic of Japan Zeon), etc.

[0119] The light distribution method of the light distribution structure of Example 6 is as follows Fig.23 As shown in the figure, the light beam emitted from the wide-angle LED light source 610 is converged by the aspheric lens 620. The converged light is then distributed by the compound astigmatism lens 630, and its maximum distribution angle is 170°. The light spots output by each plano-convex lens unit after light distribution overlap with each other, and after superposition, a uniform light spot distribution of a wide-angle rectangular shape is formed.

[0120] Example 7

[0121] The light distribution structure of this embodiment is composed of an infrared vertical strong surface emitting laser diode (VCSEL) 710 and a composite diffraction lens 720, and can be used for a mobile terminal 3D flight time sensor and a 2D camera sensor. Fig.24As shown. The composite astigmatism lens 720 consists of multiple concave-convex lens units, and its maximum light distribution angle can reach 170°, which can meet the uniform illumination requirements of wide-angle (fisheye) sensors. The composite astigmatism lens adopts a free-form surface with different contour lines in the XY direction. The arrangement of multiple concave-convex lens units is a square arrangement. The light incident surface below the concave-convex lens unit close to the light source is a convex surface, and the light emitting surface above it is a concave surface. After the edge incident light is refracted by the convex surface, the angle between it and the optical axis exceeds 40°. The vertical cavity surface emitting laser diode (VCSEL) 710 is the same as that in Example 1. The beam angle of the infrared vertical high intensity surface emitting laser diode (VCSEL) 710 of Example 7 is between 15° and 60°. Vertical cavity surface emitting laser VCSEL array, length L: 972μm, width W: 680μm, effective emission surface length A: 479μm, effective emission surface width B: 575μm, lateral spacing of emission points Px: 52μm, longitudinal spacing of emission points Py: 30.5μm, emission point diameter 11μm, number of emission points: 361, full emission angle: 24°×18°.

[0122] The light distribution method of the multiple concave-convex lens units is as follows: they are used to evenly distribute the light emitted by the VCSEL array 710 at a large angle, and the maximum light distribution angle is 170°. The light spots output by each concave-convex lens unit after light distribution overlap with each other, and after superposition, form a large-angle rectangular uniform light spot distribution.

[0123] The composite astigmatism lens 720 is composed of a plurality of free-form surface concave-convex lens units. In the embodiment 7, the top isometric view of the concave-convex lens unit is preferably as shown in FIG. Fig.25 As shown, its bottom isometric view is as follows Fig.26 As shown. Among them, the concave surface 722 on the light-emitting side has contour lines with different curvatures in the X and Y directions, that is, 722X and 722Y have different curvatures. The convex surface 721 on the light-incoming side for light distribution is also a contour line with different curvatures, and its 721X and 721Y have different curvatures. The function of the concave-convex lens unit of the composite astigmatism lens 720 using a free-form surface is to generate light distribution at different angles in the X and Y directions respectively.

[0124] The material of the composite astigmatism lens 720 is high temperature resistant, infrared transparent liquid silicone LSR, or infrared plastic such as infrared PMMA (polymethyl methacrylate), PP (polypropylene), PS (polystyrene), PA (polyamide), PC (polycarbonate), PE (polyethylene), ABS (acrylonitrile, butadiene, styrene terpolymer), K26R (COC optical plastic of Japan Zeon), etc.

[0125] Example 8

[0126] The light distribution structure of this embodiment is composed of an infrared vertical strong surface emitting laser diode (VCSEL) 810 and a composite astigmatism lens 820, and can be used for mobile terminal 3D time-of-flight sensors and 2D camera sensors. The composite astigmatism lens 820 is composed of a plurality of plano-convex lens units, the light incident surface of the plano-convex lens unit below close to the light source is a convex surface, and the light emitting surface above is a plane. The light distribution curved surface on the light incident side of the plano-convex lens is a free-form surface with different contour lines in the XY direction. The maximum light distribution angle of the composite astigmatism lens 820 can reach 170°, which can meet the requirements of uniform illumination of wide-angle (fisheye) sensors. The side of the plano-convex lens unit close to the emission source is a convex surface, and the angle between the edge incident light and the optical axis exceeds 40° after being refracted by the convex surface.

[0127] The vertical cavity surface emitting laser diode (VCSEL) 810 is composed of multiple vertical cavity emitting laser diodes arranged in a square arrangement, and the emission wavelength is 940nm. The beam angle of the infrared vertical high intensity surface emitting laser diode (VCSEL) 810 is between 15° and 60°. The vertical cavity surface emitting laser VCSEL array 810 is 972μm long, 680μm wide, A: 479μm effective emission surface length, B: 575μm effective emission surface width, Px: 52μm emission point lateral spacing, Py: 30.5μm emission point longitudinal spacing, and the emission point diameter 11μm, number of emission points: 361, full emission angle: 24°×18°.

[0128] The material of the composite astigmatism lens 820 is high temperature resistant, infrared transparent liquid silicone LSR, or infrared plastic such as infrared PMMA (polymethyl methacrylate), PP (polypropylene), PS (polystyrene), PA (polyamide), PC (polycarbonate), PE (polyethylene), ABS (acrylonitrile, butadiene, styrene terpolymer), K26R (COC optical plastic of Japan Zeon), etc.

[0129] The light distribution method of the light distribution structure of this embodiment is as follows: Fig. 27 shown.

[0130] The light distribution method of the plano-convex lens unit is as follows: it is used to evenly distribute the light emitted by the VCSEL array 810 at a large angle, and its maximum light distribution angle is 170°. The light spots output by each plano-convex lens unit after light distribution overlap with each other, and after superposition, a large-angle rectangular uniform light spot distribution is formed.

[0131] The bottom isometric view of the plano-convex lens unit is shown in Fig.28As shown. The light-emitting side 822 is a plane. The convex surface 821 on the light-entering side for light distribution is a contour line with different curvatures, and its 821X and 821Y have different curvatures. The effect of the plano-convex lens unit of the composite astigmatism lens 820 using a free-form surface is that it can generate light distribution at different angles in the X and Y directions respectively.

[0132] Among them, the application of embodiments 3-8 is the flashlight and night vision lighting for auxiliary lighting of camera, the light source is one of white light LED module, infrared light LED module, VCSEL infrared laser single chip module, VCSEL white light laser single chip module, VCSEL infrared laser array multi-chip module, VCSEL white light laser array multi-chip module, the color temperature of the white light is 3500~15000K, and the wavelength of the infrared light is 650~1500nm. The light distribution structure of this scheme includes at least one light source module and a composite astigmatism lens, and it can also be composed of more than two light source modules and a composite astigmatism lens.

[0133] In addition, it should be noted that, in addition to the square arrangement of the above embodiment, the compound astigmatism lens can also have other different arrangements, such as Fig.29 (a) Fig.29 (b) Fig.29 (c) Fig.29 As shown in (d) in the figure. The combination and arrangement of multiple concave-convex lens units or multiple plano-convex lens units includes quadrilateral, hexagon and circle. It can also be simply deduced from this to form other polygonal combinations, which are not described one by one in this application. Any simple change in the arrangement will be deemed to infringe the claimed scope of this patent. The lens shape of the compound astigmatism lens can be a square, a rounded quadrilateral, and a circle. In addition to the shapes of the above-mentioned implementation schemes, it can also have other different lens shapes.

[0134] The above specific implementation modes are preferred embodiments of the present invention and cannot be used to limit the present invention. Any other changes or other equivalent replacement methods that do not deviate from the technical solution of the present invention are included in the protection scope of the present invention.

Claims

1. A light distribution structure for auxiliary lighting and ranging, characterized in that: include: N transmitting modules and a composite astigmatism lens for evenly distributing incident light, N ≥ 1; The composite astigmatism lens is arranged directly above the transmitting module; The light incident surface of the composite astigmatism lens close to the emitting module is a convex surface. After the incident light incident on the edge of the composite astigmatism lens is refracted by the convex surface, the angle between the light and the optical axis exceeds 40°; The transmitting module comprises: an infrared vertical cavity surface emitting laser diode and a substrate; the infrared vertical cavity surface emitting laser diode is arranged on the upper surface of the substrate; The composite astigmatism lens comprises: K concave-convex lens units or L plano-convex lens units; K>1, wherein the light incident surface of the concave-convex lens unit close to the transmitting module is a convex surface, and the light exit surface above the concave-convex lens unit is a concave surface. The maximum light distribution angle of each concave-convex lens unit is 170°. The light spots output by the concave-convex lens unit after light distribution overlap with each other, and form a rectangular uniform light spot distribution after superposition. The light beam emitted by the laser diode emitted from the vertical cavity surface first converges after passing through the convex surface of the concave-convex lens unit, and then intersects near the concave surface. The concave surface diffuses the light, and after diffusion, a light spot distribution with a full beam angle of 2ψ is formed; L>1, wherein the light incident surface of the plano-convex lens unit close to the transmitting module is a convex surface, the light exiting surface of the plano-convex lens unit is a plane, and the maximum light distribution angle of multiple plano-convex lens units can also reach 170 degrees. The light beam emitted by the laser diode is emitted from the vertical cavity surface, and is first converged after passing through the light incident surface of the plano-convex lens unit, and then intersects near the plane of the plano-convex lens unit after convergence. The plane diffuses the incident light, and after diffusion, a spot distribution with a full beam angle of 2ψ is formed.

2. The light distribution structure according to claim 1, characterized in that: The light distribution curved surface of the composite astigmatism lens is a symmetrical curved surface with the same contour lines in the XY direction or a free-form curved surface with different contour lines in the XY direction, wherein the light distribution curved surface is a convex surface.

3. The light distribution structure according to claim 1, characterized in that: The vertical cavity surface emitting laser diode is formed by arranging multiple vertical cavity emitting laser diodes. The vertical cavity surface emitting laser diode is any one of a square arrangement, a hexagonal arrangement, a circular arrangement, a staggered arrangement, or a pseudo-random array. The output wavelength of the vertical cavity surface emitting laser diode is 650 to 1500nm.

4. The light distribution structure according to claim 1, characterized in that: The material of the composite astigmatism lens is liquid silicone LSR or infrared plastic, and the infrared plastic is any one of infrared PMMA, PP, PS, PA, PC, PE, ABS and K26R.

5. The light distribution structure according to claim 1, characterized in that: The arrangement of the plurality of plano-convex lens units is a square arrangement.

6. The light distribution structure according to claim 1, characterized in that: A plurality of plano-convex lens units evenly distribute the light emitted by the vertical cavity surface emitting laser diode. The light spots output by each plano-convex lens unit after light distribution overlap with each other to form a rectangular even light spot distribution after superposition.

7. The light distribution structure according to claim 1, characterized in that: The emission module comprises a light emitting diode and a condensing lens, wherein the condensing lens is arranged between the light emitting diode and the composite diffusing lens.

8. The light distribution structure according to claim 7, characterized in that: The light emitting diode is an infrared LED or a visible light LED.

9. The light distribution structure according to claim 7, characterized in that: The focusing lens is a flat plate lens, and the flat plate lens is any one of a sawtooth Fresnel lens, a concentric ring zone plate lens, and a diffractive optical lens.

10. The light distribution structure according to claim 9, characterized in that: The light beam incident from the sawtooth Fresnel lens is first converged by the light incident surface of the concave-convex lens unit, and then intersects near the concave surface of the concave-convex lens unit. The concave surface diffuses the light, and after diffusion, a spot distribution with a full beam angle of 2ψ is formed.

11. The light distribution structure according to claim 10, characterized in that: The light beam incident from the sawtooth Fresnel lens is first converged after passing through the light incident surface of the plano-convex lens unit, and then intersects near the plane of the plano-convex lens unit. The plane output light beam forms a spot distribution with a full angle of 2ψ.

12. The light distribution structure according to claim 4, characterized in that: The focusing lens is an aspherical lens, and the light emitting diode is a chip LED.

13. The light distribution structure according to claim 1, characterized in that: The concave surface and the convex surface of the meniscus lens unit have contour lines with different curvatures in both the X and Y directions.

14. The light distribution structure according to claim 1, characterized in that: The light distribution curved surface of the plano-convex lens unit is a free-form surface with different contour lines in the XY directions, and the light distribution curved surface is a concave surface.

15. The light distribution structure according to claim 1, characterized in that: The combination arrangement of the compound astigmatism lenses is any one of quadrilateral, hexagonal, circular, staggered and random arrangements.

16. The light distribution structure according to claim 1, characterized in that: The shape of the compound astigmatism lens is any one of a square, a rounded quadrilateral, an ellipse, a circle, and a polygon.

17. The light distribution structure according to claim 1, characterized in that: The emission module is a white light vertical high intensity surface emitting laser diode and a substrate; the white light vertical high intensity surface emitting laser diode is a white light laser single chip module or a white light laser array multi-chip module, and the color temperature of the white light is 3500 to 15000K.

18. The light distribution structure according to claim 1, characterized in that: The light source module and the compound astigmatism lens are separately arranged or the light source module and the compound astigmatism lens are combined into an integrated module.

19. The light distribution structure according to claim 1, characterized in that: The infrared vertical strong surface emitting laser is an infrared laser single chip module or an infrared laser array multi-chip module.

20. The light distribution structure according to claim 19, characterized in that: The wavelength of infrared light is 650 to 1500 nm, and the full angle of the light beam output by the infrared laser single-chip module or the infrared laser array multi-chip module is between 5 and 40 degrees.

21. An application of the light distribution structure according to any one of claims 1 to 20, characterized in that: The light distribution structure is used for auxiliary lighting and uniform light distribution of 3D time-of-flight sensors and 2D photo sensors in mobile terminals.

22. A light distribution method for the auxiliary lighting and ranging light distribution structure according to claim 1, characterized in that: include: The transmitting module outputs the incident light to the compound astigmatism lens. After the convex surface of the compound astigmatism lens refracts and distributes the incident light, a first refracted light is obtained. The first refracted light is refracted by the light-emitting surface of the compound astigmatism lens to output a second refracted light.

23. The light distribution method according to claim 22, characterized in that: include: The vertical cavity surface emitting laser diode outputs the incident light. When the incident edge light RS is refracted and distributed by the convex surface of a single concave-convex lens unit, the maximum angle δ° between the refracted light ST and the optical axis OZ is obtained, δ>40°; after the light ST is output through the concave surface, the maximum distribution angle ψ between the output light TU and the optical axis OZ is obtained, ψ>sin -1 (n*sin(δ)), where n is the refractive index of the infrared material of the concave-convex lens unit, and the concave surface is the secondary light distribution surface, which plays the role of beam expansion again.

24. The light distribution method according to claim 23, characterized in that: The refractive index is n=1.49, δ=40°, and the maximum light distribution angle ψ between the output light TU passing through the concave surface of the concave-convex lens unit and the optical axis OZ is greater than 73.

28.

25. The light distribution method according to claim 22, characterized in that: include: The vertical cavity surface emitting laser diode outputs the incident light. When the incident edge light RS is refracted and distributed by the convex surface of a single plano-convex lens unit, the maximum angle δ° between the refracted light ST and the optical axis OZ is obtained, δ>40°; after the light ST is output through the light output surface, the maximum distribution angle ψ between the output light TU and the optical axis OZ is obtained, ψ>sin -1 (n*sin(δ)), where n is the refractive index of the infrared material of the plano-convex lens unit.

26. The light distribution method according to claim 25, characterized in that: The refractive index is n=1.49, δ=40°, and the maximum light distribution angle ψ>73.28 between the output light TU passing through the plane of the plano-convex lens unit and the optical axis OZ.

27. The light distribution method according to claim 22, characterized in that: include: The light beam emitted by the LED light source is converged by a sawtooth Fresnel lens; the converged light is then distributed by a compound astigmatism lens, and the light spots output by each concave-convex lens unit in the compound astigmatism lens after distribution overlap with each other, forming a uniform light spot distribution after superposition.

28. The light distribution method according to claim 22, characterized in that: include: The light beam emitted by the LED light source is converged by the sawtooth Fresnel lens; the converged light beam is then converged by the convex surface of the plano-convex lens unit, and the converged light beam intersects with the plane of the plano-convex lens unit.

29. The light distribution method according to claim 22, characterized in that: include: The light beam emitted by the SMD LED light source is converged by an aspherical lens; the converged light then passes through a compound astigmatism lens; After light distribution, the light spots output by each concave-convex lens unit overlap with each other to form a rectangular uniform light spot distribution.

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