CN114296298A

CN114296298A - Light distribution structure for auxiliary lighting and distance measurement and light distribution method thereof

Info

Publication number: CN114296298A
Application number: CN202110696088.5A
Authority: CN
Inventors: 郎欢标
Original assignee: Mikolta Optical Technology Co ltd
Current assignee: Mikolta Optical Technology Co ltd
Priority date: 2021-06-22
Filing date: 2021-06-22
Publication date: 2022-04-08
Also published as: WO2022267648A1

Abstract

The invention discloses a light distribution structure for auxiliary illumination and distance measurement and a light distribution method thereof, wherein the light distribution structure comprises: n emission modules and a composite astigmatic lens for uniformly distributing incident light, wherein N is more than or equal to 1; the composite astigmatic lens is arranged right above the transmitting module; the light incident surface of the combined type astigmatic lens, which is close to the emission module, is a convex surface, and after the incident light rays incident to the edge of the combined type astigmatic lens are refracted by the convex surface, the included angle between the light rays and the optical axis exceeds 40 degrees. The invention adopts the composite type astigmatic lens composed of a plurality of plano-convex lenses or a plurality of concave-convex lenses, the divergence angle of the light beam can reach 170 degrees at most, large wide-angle illumination is realized, and the requirement of uniform illumination of a wide-angle sensor can be met.

Description

Light distribution structure for auxiliary lighting and distance measurement and light distribution method thereof

Technical Field

The invention relates to the technical field of auxiliary lighting light distribution for camera shooting, in particular to a light distribution structure for auxiliary lighting and distance measurement and a light distribution method thereof.

Background

Along with increasingly popular and rapid development of mobile terminals such as smart phones, smart watches, wearable sensors, etc., increasingly higher requirements are put forward on the detection distance and detection range of the sensors. Besides meeting the requirements of common shooting and photographing, a time-of-flight sensor (ToF), laser ranging, virtual reality/augmented reality (AR/VAR) for 3D perception are also more and more popular, and the detection range is also wider and wider. The sensor for 3D perception is characterized in that a transmitting module transmits modulated near-infrared light, the near-infrared light is reflected after encountering an object, the distance of a shot scene is converted by the sensor through calculating the time difference or phase difference between light transmission and reflection so as to generate depth information, and in addition, the three-dimensional outline of the object can be presented in a topographic map mode that different colors represent different distances by combining with traditional camera shooting.

The prior auxiliary lighting and uniform light distribution device for a 3D flight time sensor and a 2D photographing sensor of a mobile terminal generally adopts a light distribution mode similar to a fly eye lens/fly eye lens, for example, patent CN208794326U discloses a high-efficiency flash lamp lens module technology with uniform light distribution, the structure of the device is shown in figure 1, the device comprises a light emitter, a collimating lens arranged above the light emitter and used for collimating light, a modulation sheet arranged above the collimating lens and used for uniform light distribution, the collimating lens is a ring-shaped total reflection collimation Fresnel lens, the collimating lens comprises an aspheric collimating surface arranged in the middle of the collimating lens, a plurality of circles of reflecting prisms surrounding the aspheric collimating surface, and the reflecting prisms comprise 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. The technology can form a uniform light spot which just covers the visual field of the camera lens, improve the utilization efficiency of light energy, solve the problems of uniformity of the shape and color temperature of the light spot, and improve the attractiveness because the shape and arrangement of the light emitting devices below the lens cannot be seen by the direct vision of human eyes. However, since the microlens array adjustment sheet in the patent is formed by compounding a plurality of biconvex lenses, the divergence angle of the output light beam is limited by the structure of the biconvex optical curved surface, the maximum divergence angle of the output light beam can only be within 90 degrees, and the structure cannot meet the requirement for a larger divergence angle. With the development of the industry, the field angle requirement of the camera is increasing day by day, and the microlens array modulation sheet with the structure of the biconvex optical curved surface cannot be used satisfactorily.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a wide-angle light distribution structure for auxiliary illumination and distance measurement and a light distribution method thereof.

The purpose of the invention is realized by the following technical scheme:

a light distribution structure for auxiliary illumination and distance measurement is characterized by comprising: n emission modules and a composite astigmatic lens for uniformly distributing incident light, wherein N is more than or equal to 1; the composite astigmatic lens is arranged right above the transmitting module; the light incident surface of the combined type astigmatic lens, which is close to the emission module, is a convex surface, and after the incident light rays incident to the edge of the combined type astigmatic lens are refracted by the convex surface, the included angle between the light rays and the optical axis exceeds 40 degrees.

Preferably, the light distribution curved surface of the combined type light scattering lens is a symmetric curved surface with the same contour lines in the XY direction or a free curved surface with different contour lines in the XY direction, wherein the light distribution curved surface is a convex surface.

Preferably, the transmitting module includes: an infrared vertical strong surface emitting laser diode and a substrate; the infrared vertical strong surface emitting laser diode is arranged on the upper surface of the substrate.

Preferably, the vertical cavity surface emitting laser diode is formed by arranging a plurality of vertical cavity emitting laser diodes, the vertical cavity surface emitting laser diodes are arranged in 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 650-1500 nm.

Preferably, the compound astigmatic lens comprises: k meniscus lens units, K > 1; the light incident surface of the concave-convex lens unit close to the emission module is a convex surface, and the light emergent surface above the concave-convex lens unit is a concave surface.

Preferably, the maximum light distribution angle of each meniscus lens unit is 170 °, and light spots output after light distribution of the meniscus lens units are mutually overlapped to form uniform light spot distribution of a large-angle rectangle after superposition.

Preferably, the composite light dispersing lens is made of liquid silicone rubber LSR or infrared plastic, and the infrared plastic is any one of infrared PMMA, PP, PS, PA, PC, PE, ABS and K26R.

Preferably, the light beam emitted from the vertical cavity surface emitting laser diode is converged by the convex surface of the meniscus unit, and then, the converged light beam is intersected in the vicinity of the concave surface, and the concave surface diffuses the light beam to form a spot distribution having a beam angle of 2 ψ.

Preferably, the compound astigmatic lens comprises: l plano-convex lens cells, L > 1; the light incident surface of the plano-convex lens unit, which is close to the emission module, is a convex surface, and the light emergent surface of the plano-convex lens unit is a plane.

Preferably, the maximum light distribution angle of the plurality of plano-convex lens units can reach 170 degrees.

Preferably, the plurality of plano-convex lens cells are arranged in a square.

Preferably, the plurality of plano-convex lens units uniformly distribute light emitted by the vertical cavity surface emitting laser diode, and light spots output by each plano-convex lens unit after light distribution are overlapped to form large-angle rectangular uniform light spot distribution after superposition.

Preferably, the light beam emitted by the vertical cavity surface emitting laser diode is converged by the light incident surface of the plano-convex lens unit, and then the converged light beam is intersected near the plane of the plano-convex lens unit, and the plane diffuses the light beam to form a spot distribution with a beam angle of 2 psi.

Preferably, the transmitting module includes: the light-emitting diode and the condensing lens are arranged between the light-emitting diode and the composite type light-dispersing lens.

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

Preferably, the condensing lens is a flat lens, and the flat lens is any one of a fresnel lens, a zone plate lens of a concentric ring shape, and a diffractive optical lens.

Preferably, the light beam incident from the fresnel lens is converged through the light incident surface of the meniscus lens unit, and then the converged light beam intersects with the vicinity of the concave surface of the meniscus lens unit, and the concave surface diffuses the light beam to form a spot distribution having a beam angle of 2 ψ.

Preferably, the light beams incident from the serrated fresnel lens are converged through the incident surface of the plano-convex lens unit, and then intersect near the plane of the plano-convex lens unit, and the planar output light beams form a light spot distribution with a full angle of 2 ψ.

Preferably, the condensing lens is an aspherical lens, and the light emitting diode is a patch LED.

Preferably, the concave and convex surfaces of the meniscus element have contours of different curvatures in both the X and Y directions.

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

Preferably, the combined arrangement mode of the combined type astigmatic lenses is any one of quadrangle, hexagon, circle, staggered arrangement and random arrangement;

preferably, the shape of the compound astigmatic lens is any one of a square, a rounded quadrangle, an ellipse, a circle, and a polygon.

Preferably, the emitting module is a white light vertical strong surface emitting laser diode and a substrate; the white light vertical strong 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 3500-15000K.

Preferably, the light source module and the combined type astigmatic lens are separately arranged or the light source module and the combined type astigmatic lens are combined into an integrated module.

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

Preferably, the wavelength of the infrared light is 650-1500 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 5-40 degrees.

The light distribution structure is used for auxiliary lighting and uniform light distribution of a 3D flight time sensor and a 2D photographing sensor of a mobile terminal.

The purpose of the invention is also realized by the following technical scheme:

a light distribution method for auxiliary lighting and distance measurement comprises the following steps:

the emitting module outputs incident light to the composite type light dispersing lens, the convex surface of the composite type light dispersing lens refracts the incident light for light distribution to obtain first refracted light, and the first refracted light is refracted by the light emitting surface of the composite type light dispersing lens to output second refracted light.

Preferably, the vertical cavity surface emitting laser diode outputs incident light, and after incident marginal light RS is refracted and distributed by the convex surface of a single meniscus lens unit, a maximum included angle δ ° between a refracted light ST and an optical axis OZ is obtained, and δ is greater than 40 °; after the light rays ST are output through the concave surface, the maximum light distribution angle psi, psi & gtsin of the output light rays TU and the optical axis OZ^-1(n × sin (δ)), where n is the refractive index of the infrared material of the meniscus unit, and the concave surface is the secondary light distribution surface, and functions as a secondary beam expander.

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

Preferably, the vertical cavity surface emitting laser diode outputs incident light, and after incident marginal light RS is subjected to refraction and light distribution by the convex surface of a single plano-convex lens unit, a maximum included angle δ ° between a refracted light ST and an optical axis OZ is obtained, wherein δ is larger than 40 °; after the light rays ST are output from the light-emitting surface, the maximum light distribution angle psi, psi & gtsin between the output light rays TU and the optical axis OZ^-1(n sin (δ)), where n is the refractive index of the infrared material of the plano-convex lens cell.

Preferably, the refractive index n is 1.49, the refractive index δ is 40 °, and the maximum light distribution angle ψ > 73.28 between the output light ray TU passing through the plane of the planoconvex lens unit and the optical axis OZ is larger than the maximum light distribution angle δ.

Preferably, the light beams emitted by the LED light source are converged by the serrated Fresnel lens; the converged light is subjected to light distribution through the composite light dispersing lens, and light spots output after light distribution of each concave-convex lens unit in the composite light dispersing lens are overlapped to form uniform light spot distribution after superposition.

Preferably, the light beams emitted by the LED light source are converged by the serrated Fresnel lens; the converged light rays are converged by the convex surface of the plano-convex lens unit, and the converged light rays are intersected with the plane of the plano-convex lens unit.

Preferably, the light beam emitted by the patch LED light source is converged by the aspheric lens; the converged light passes through a composite type astigmatic lens; and (4) carrying out light distribution, wherein light spots output after the light distribution of each concave-convex lens unit are mutually overlapped to form uniform light spot distribution of a large-angle rectangle after superposition.

Compared with the prior art, the invention has the following advantages:

the invention adopts the composite type astigmatic lens composed of a plurality of plano-convex lenses or a plurality of concave-convex lenses, the divergence angle of the light beam can reach 170 degrees at most, large wide-angle illumination is realized, and the requirement of uniform illumination of a wide-angle (fish eye) sensor can be met. The concave-convex lens unit or the plano-convex lens unit is convex on one side close to the emission source, the included angle between the edge incident light and the optical axis exceeds 40 degrees after the edge incident light is refracted by the convex surface, and the maximum light distribution angle (full angle) can reach 170 degrees after the edge incident light is refracted by the concave surface or the plane of the light emitting surface.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a structural diagram of a conventional high-efficiency flash lens module with uniform light distribution.

Fig. 2 is a sectional view of the light distribution structure of embodiment 1.

Fig. 3 is an isometric front exploded view of the light distribution structure of embodiment 1.

Fig. 4 is an isometric rear exploded view of the light distribution structure of embodiment 1.

Fig. 5 is a light distribution diagram of the light distribution structure of embodiment 1.

Fig. 6 is a schematic diagram of light distribution of a single meniscus lens unit of example 1.

Fig. 7 is a schematic diagram of the light distribution angle of the marginal ray of the single meniscus lens unit of example 1.

Fig. 8 is a light distribution simulation diagram of the light distribution structure of embodiment 1.

Fig. 9 is a simulated graph of irradiance distribution of the light distribution structure of embodiment 1 at a distance of 500 mm.

Fig. 10 is a sectional view of the light distribution structure of example 2.

Fig. 11 is a light distribution diagram of the light distribution structure of embodiment 2.

Fig. 12 is a schematic diagram of light distribution of a single plano-convex lens unit of embodiment 2.

Fig. 13 is a schematic diagram of light distribution angles of marginal rays of a single plano-convex lens unit of embodiment 2.

Fig. 14 is a sectional view of the light distribution structure of example 3.

Fig. 15 is a light distribution diagram of the light distribution structure of embodiment 3.

Fig. 16 is a schematic diagram of light distribution of a single meniscus lens unit according to embodiment 3.

Fig. 17 is a schematic diagram of light distribution angles of marginal rays of a single meniscus lens unit of example 3.

Fig. 18 is a sectional view of the light distribution structure of example 4.

Fig. 19 is a light distribution diagram of the light distribution structure of embodiment 4.

Fig. 20 is a schematic diagram of light distribution of a single plano-convex lens unit of embodiment 4.

Fig. 21 is a schematic diagram of light distribution angles of marginal rays of a single plano-convex lens unit of embodiment 4.

Fig. 22 is a light distribution diagram of the light distribution structure of embodiment 5.

Fig. 23 is a light distribution diagram of the light distribution structure of embodiment 6.

Fig. 24 is a light distribution diagram of the light distribution structure of embodiment 7.

Fig. 25 is a top isometric view of a meniscus composite lens unit according to example 7.

Fig. 26 is a bottom isometric view of a meniscus composite lens unit according to example 7.

Fig. 27 is a light distribution diagram of the light distribution structure of embodiment 8.

Fig. 28 is a bottom isometric view of a plano-convex compound lens unit of example 8.

FIG. 29 (a) is a schematic diagram of a square arrangement of the compound astigmatic lens.

Fig. 29 (b) is a schematic view of another square arrangement of the compound astigmatic lens.

Fig. 29 (c) is a schematic view of a hexagonal array of the composite astigmatic lenses.

Fig. 29 (d) is a schematic view of a circular arrangement of the compound astigmatic lenses.

Detailed Description

The invention is further illustrated by the following figures and examples.

Example 1:

the light distribution structure of the embodiment is composed of a substrate 130, an infrared vertical strong surface emitting laser diode (VCSEL)110, and a compound light scattering lens 120, and can be used for auxiliary lighting and uniform light distribution of a mobile terminal 3D flight time sensor and a 2D photographing sensor, wherein a cross-sectional view of the light distribution structure of the embodiment is shown in fig. 2, an isometric front exploded view is shown in fig. 3, and an isometric rear exploded view is shown in fig. 4. The vertical cavity surface emitting laser diode (VCSEL)110 is formed by arranging a plurality of vertical cavity emitting laser diodes in a square arrangement with an emission wavelength of 940 nm. The beam angle of an infrared vertical strong surface emitting laser diode (VCSEL)110 is between 15 deg. and 60 deg.. Parameters of the infrared vertical strong surface emitting laser diode (VCSEL)110 are referenced in table one, length L of VCSEL array: 972 μm, width W: 680 μm, effective emitting surface length a: 479 μm, effective emission face width B: 575 μm, emission point lateral spacing Px: 52 μm, emission point longitudinal spacing Py: 30.5 μm, diameter of emission point

11 μm, number of emission points: 361, full angle of emission: 24 ° × 18 °.

Table one: parameters of VCSEL array 5

The compound astigmatic lens 120 is composed of a plurality of meniscus lens units arranged in a square shape. The light incident surface below the meniscus lens unit and close to the light source is a convex surface, and the light emergent surface above the meniscus lens unit is a concave surface. A light distribution method of the light distribution structure of the present embodiment is shown in fig. 5. The concave-convex lens unit is used for uniformly distributing light emitted by the VCSEL array in a large angle, and the maximum light distribution angle of the concave-convex lens unit is 170 degrees. Light spots output after the light distribution of each concave-convex lens unit are mutually overlapped to form large-angle rectangular uniform light spot distribution after superposition.

The material of the composite light diffusion lens 120 is a high temperature resistant and infrared transmitting liquid silicone LSR, or an 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 japanese rui-wen), etc., and is not limited specifically herein.

The light distribution of a single meniscus lens unit 120 in the compound dispersing lens is shown in fig. 6. In the figure, 110 is a VCSEL light source, 121 is a light incident surface of a single meniscus lens unit, which is a convex surface and a main light distribution surface; and 122 is a light emergent surface of the single meniscus lens unit, which is a concave surface and is a secondary light distribution surface, and plays a role of expanding beams again. The light beams emitted from the VCSEL converge through the light incident surface 121, and intersect near the concave surface 122 after converging.

The light incident surface 121 of the meniscus lens unit satisfies the following light distribution conditions: when the incident marginal ray RS is refracted by the curved surface 121 of the single meniscus lens unit to distribute light, the maximum included angle δ between the refracted ray ST and the optical axis OZ is greater than 40 °. After the light ray ST is output through the light emitting surface 122, the maximum light distribution angle psi of the output light ray TU and the optical axis OZ is larger than sin^-1(n sin (δ)), where n is the refractive index of the infrared material. Assuming that the refractive index n is 1.49 and the refractive index δ is 40 °, the maximum light distribution angle ψ of the output light ray TU to the optical axis OZ is > 73.28 °. The concave surface 122 is a secondary light distribution surface, which functions as a secondary beam expanding, which further expands the beam angle of the outgoing light. This implementationIn the example, the concave surface 122 having the maximum light distribution angle ψ of 85 ° (the beam angle total angle 2 ψ of 170 °) diffuses an incident light beam to form a spot distribution having the beam angle total angle 2 ψ.

The angular relationship of the edge incident rays and the exiting rays of a single meniscus element 12 is shown in figure 7. OZ in the figure is the optical axis through the center of the single meniscus cell 120, with point O at the light emitting surface of the VCSEL; RS is an incident ray passing through the edge of the meniscus lens unit 120, where S is located above the top edge of the convex surface 121, and an 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 full angle of the maximum emission angle of the wig VCSEL is 24 °).

Fig. 8 and 9 are the results of a computer simulation using the compound astigmatic lens of this embodiment and a simulation of the irradiance distribution at 500mm distance, respectively. As can be seen from fig. 9, at a distance of 500mm, the spot is rectangular, and the uniformity of irradiance distribution is over 60% over a range of 1.4 meters by 1 meter. The uniformity distribution requirement of the time-of-flight sensor (ToF) in this range can be met.

Example 2

The cross-sectional view of the light distribution structure of this embodiment is shown in fig. 10, and is composed of a substrate 230, an infrared vertical strong surface emitting laser diode (VCSEL)210, and a compound light dispersing lens 220. The light distribution structure of the embodiment can be used for auxiliary lighting and uniform light distribution of a 3D flight time sensor and a 2D photographing sensor of the mobile terminal. The compound astigmatic lens 220 is composed of a plurality of plano-convex lens units, the arrangement mode of the plano-convex lens units is square arrangement, one side of the plano-convex lens unit, which is close to the emission source (210), is a convex surface, and the included angle between the edge incident light and the optical axis exceeds 40 degrees after the edge incident light is refracted by the convex surface. The maximum light distribution angle of the combined type light scattering lens 220 can reach 170 degrees, so that the requirement of uniform illumination of a wide-angle (fish-eye) sensor is met. An infrared vertical strong surface emitting laser diode (VCSEL)210 is formed by arranging a plurality of vertical cavity emitting laser diodes in a square arrangement, has an emission wavelength of 940nm, has a beam angle of 15 to 60 degrees, and has parameters consistent with those of embodiment 1, please refer to table one.

The material of the compound light dispersing lens 120 is high temperature resistant, infrared transmitting liquid silicone LSR, or infrared plastics such as infrared PMMA (polymethyl methacrylate), PP (polypropylene), PS (polystyrene), PA (polyamide), PC (polycarbonate), PE (polyethylene), ABS (acrylonitrile, butadiene, styrene terpolymer), K26R (COC optical plastics of japanese ruing-an), etc.

A light distribution method of the light distribution structure of the present embodiment is shown in fig. 11. The light emitted by the VCSEL array is uniformly distributed by the plano-convex lens units in a large angle, and the maximum light distribution angle is 170 degrees. Light spots output after the light distribution of each plano-convex lens unit are mutually overlapped to form large-angle rectangular uniform light spot distribution after superposition.

The light distribution of the single plano-convex lens unit 220 is shown in fig. 12. In the figure, 210 is a VCSEL light source, 221 is the light incident surface of a single plano-convex lens unit, which is convex; 222 is a light exit surface of a single plano-convex lens unit, which is a plane. The light beams emitted from the VCSEL are converged through the light incident surface 221, and then intersect near the plane 222. The plane 222 diffuses the incident light to form a spot distribution with a beam angle of 2 psi. In the single plano-convex lens unit 220, the light incident surface 221 is a main light distribution surface, and the light emitting surface 222 is a plane, which does not have a light distribution effect.

The angular relationship between the edge incident light and the exit light of the single plano-convex lens unit 220 is shown in fig. 13. OZ in the figure is the optical axis passing through the center of the single plano-convex lens unit 220, and the point O is located on the light emitting surface of the VCSEL 210; RS is an incident ray passing through the edge of the plano-convex lens unit 220, where S is located above the edge of the convex surface 221, and an 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 VCSEL, and embodiment 2 prefers the angle θ to be 12 ° (assuming that the maximum emission angle of the VCSEL is 24 °).

The light incident surface (convex surface) 221 satisfies the following light distribution conditions: when the incident marginal ray RS is refracted by the curved surface 221 of the single plano-convex lens unit for light distribution, the maximum included angle δ between the refracted ray ST and the optical axis OZ is greater than 40 °. Light rays ST go out throughAfter the surface 222 is output, the maximum light distribution angle psi between the output light TU and the optical axis OZ is larger than sin^-1(n sin (δ)), where n is the refractive index of the infrared material. Assuming that the refractive index n is 1.49 and the refractive index δ is 40 °, the maximum light distribution angle ψ of the output light ray TU to the optical axis OZ is > 73.28 °. Plane 222 is an output plane that has no light distribution. Example 2 has a maximum light distribution angle ψ of 85 ° (a beam angle full angle 2 ψ of 170 °)

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

Example 3

A cross-sectional view of this embodiment is shown in fig. 14. The light distribution structure of the embodiment is composed of a large-angle LED light source 310, a flat lens 320, and a composite light scattering lens 330, and can be used for auxiliary lighting and uniform light distribution of a 3D flight time sensor and a 2D photographing sensor of a mobile terminal. The LED light source is an infrared LED or a visible light LED. The LED light source 310 has a large light emitting surface, typically 1mmx1mm or more. While it has a large beam angle, typically a Lambertian distribution around 120 °. The compound type astigmatic lens is composed of a plurality of concave-convex lens units. The arrangement of the plurality of meniscus lens units is a square arrangement. The light incident surface below the meniscus lens unit, which is close to the plate lens 320, is a convex surface, the light emitting surface above the meniscus lens unit is a concave surface, and after being refracted by the convex surface, the edge incident light has an included angle of more than 40 degrees with the optical axis. The maximum light distribution angle of the composite light scattering lens can reach 170 degrees, and the requirement of uniform illumination of a wide-angle (fish-eye) sensor can be met. The flat lens 320 is a fresnel lens with a sawtooth shape, and converges the light beam emitted from the LED.

The material of the compound light dispersing lens 330 is high temperature resistant, infrared transmitting liquid silica gel LSR, or infrared plastics such as infrared PMMA (polymethyl methacrylate), PP (polypropylene), PS (polystyrene), PA (polyamide), PC (polycarbonate), PE (polyethylene), ABS (acrylonitrile, butadiene, styrene terpolymer), K26R (COC optical plastics of japanese ruing-an), etc.

A light distribution method of the light distribution structure according to embodiment 3 is shown in fig. 15. The light beams emitted from the large-angle LED light source 310 are converged by the fresnel lens 320. The converged light passes through the composite light dispersing lens 330 for light distribution, and the maximum light distribution angle is 170 °. Light spots output after the light distribution of each concave-convex lens unit are mutually overlapped to form large-angle rectangular uniform light spot distribution after superposition.

The light distribution of the single meniscus lens unit 330 is shown in fig. 16. In the figure, 331 is the light incident surface of a single meniscus lens unit, which is convex; 332 is the light-emitting surface of the single meniscus lens unit, which is concave. The light beams incident from the fresnel lens 320 converge through the incident surface 331, and intersect near the concave surface 332 after converging. The concave surface 332 diffuses the incident light to form a spot distribution with a beam angle of 2 psi. The light incident surface 331 is a primary light distribution surface, and the light emitting surface 332 is a secondary light distribution surface, which plays a role of expanding light again.

The angular relationship between the edge incident ray and the exit ray of the single meniscus lens unit 330 of embodiment 3 is shown in fig. 17. In the figure, OZ is the optical axis passing through the center of the individual meniscus 330, RS is the ray incident through the edge of the meniscus 330, where point S is located above the very edge of the convex surface 331 and RS is parallel to the optical axis OZ.

The light incident surface 331 satisfies the following light distribution conditions: when the incident marginal ray RS is refracted by the curved surface 331 of the single meniscus lens unit to distribute light, the maximum included angle δ between the refracted ray ST and the optical axis OZ is greater than 40 °. After the light ray ST is output through the light emitting surface 332, the maximum light distribution angle psi of the output light ray TU and the optical axis OZ is larger than sin^-1(n sin (δ)), where n is the refractive index of the infrared material. Assuming that the refractive index n is 1.49 and the refractive index δ is 40 °, the maximum light distribution angle ψ of the output light ray TU to the optical axis OZ is > 73.28 °. The concave surface 332 is a secondary light distribution surface, which functions as a secondary beam expanding, which further expands the beam angle of the outgoing light. The maximum light distribution angle ψ of embodiment 3 is 85 ° (the beam angle full angle 2 ψ is 170 °).

Example 4:

fig. 18 is a cross-sectional view of the light distribution structure of example 4, which is composed of an LED light source 410, a flat lens 420, and a compound light dispersing lens 430. The light distribution structure of the embodiment can be used for auxiliary lighting and uniform light distribution of a 3D flight time sensor and a 2D photographing sensor of the mobile terminal. 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, and is generally 1mmx1mm or more. While it has a large beam angle, typically a Lambertian distribution around 120 °. The compound astigmatic lens 420 is composed of a plurality of plano-convex lens cells arranged in a square shape. The light incident surface below the plano-convex lens unit and close to the plate lens 420 is a convex surface, and the light emitting surface above the plano-convex lens unit is a plane. After being refracted by the convex surface, the edge incident light has an included angle of more than 40 degrees with the optical axis. The maximum light distribution angle of the combined type light scattering lens 430 can reach 170 degrees, and the requirement of uniform illumination of a wide-angle (fish-eye) sensor can be met. The flat lens 420 is a fresnel lens having a saw-tooth shape, and converges light beams emitted from the LEDs.

The composite light scattering lens 430 is made of high temperature resistant and 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 japanese ruing-an), etc.

A light distribution method of the light distribution structure of example 4 is shown in fig. 19. The light beams from the large-angle LED light sources 410 are converged by the fresnel lens 420. The converged light passes through the composite light dispersing lens 430 for light distribution, and the maximum light distribution angle is 170 degrees. Light spots output after the light distribution of each concave-convex lens unit are mutually overlapped to form large-angle rectangular uniform light spot distribution after superposition.

The light distribution of the single plano-convex lens unit 430 is shown in fig. 20. 431 is the light incident surface of a single plano-convex lens cell, which is convex; 432 is the light exit surface of a single plano-convex lens unit, which is a plane. The light beams incident from the fresnel lens 420 are converged through the incident surface 431 and then intersect near the plane 432. Plane 432 is only an output plane whose output beam forms a spot distribution with a full angle of 2 psi. The light incident surface 431 is a main light distribution surface, and the light emitting surface 432 is a plane, which does not play any light distribution role.

The angular relationship between the edge incident light and the exiting light of the single plano-convex lens unit 430 is shown in fig. 21. In the figure, OZ is the optical axis passing through the center of the single plano-convex lens unit 430, and RS is the incident light ray passing through the edge of the plano-convex lens unit 430, where the point S is located above the most edge of the convex surface 431, and RS is parallel to the optical axis OZ.

The light incident surface 431 satisfies the following light distribution condition: when the incident marginal ray RS is refracted and distributed through the curved surface 431 of the single plano-convex lens unit, the maximum included angle delta between the refracted ray ST and the optical axis OZ is larger than 40 degrees, and the ray ST is output through the light-emitting surface 432, and the maximum light distribution angle psi between the output ray TU and the optical axis OZ is larger than sin^-1(n × sinin (δ)), where n is the refractive index of the infrared material. Assuming that the refractive index n is 1.49 and the refractive index δ is 40 °, the maximum light distribution angle ψ of the output light ray TU to the optical axis OZ is > 73.28 °. Plane 432 is an output plane that has no light distribution effect and that will emit light at a beam angle ψ. The maximum light distribution angle ψ of embodiment 4 is 85 ° (the beam angle full angle 2 ψ is 170 °).

Example 5

The light distribution structure of the embodiment can be used for auxiliary lighting and uniform light distribution of a 3D flight time sensor and a 2D photographing sensor of the mobile terminal. The intelligent door lock imaging flight time range finder is mainly used for 2D and 3D imaging flight time range finding of an intelligent mobile phone, and can be applied to 2D and 3D imaging flight time range finding of a network camera, 2D and 3D imaging flight time range finding of face recognition, 2D and 3D imaging flight time range finding of a computer camera, 2D and 3D imaging flight time range finding of an intelligent television, 2D and 3D imaging flight time range finding of security monitoring, 2D and 3D imaging flight time range finding of an intelligent automobile auxiliary driving system, human object imaging flight time range finding of a sweeper, 2D and 3D imaging flight time range finding of gesture recognition, 2D and 3D imaging flight time range finding of a game machine and 2D and 3D imaging flight time range finding of an intelligent door lock camera shooting recognition. For these fields, the thickness requirement of the module is not so much, the thickness can be appropriately increased, based on the consideration of the manufacturing cost of the module, the flat lens in embodiment 5 can be changed into an aspheric lens with lower manufacturing cost, and meanwhile, the light source is set to be a large-angle patch LED, that is, the light distribution structure in embodiment 5 is composed of an LED light source 510, an aspheric lens 520, and a compound light dispersing lens 530. The LED light source 510 has a large light emitting surface, typically 1mmx1mm or more. While having a large beam angle, typically a Lambertian distribution of around 120 °. The aspherical lens 52 is aspherical on both upper and lower surfaces, and converges light beams emitted from the LED. The compound type astigmatic lens 530 is composed of a plurality of meniscus lens units arranged in a square shape. The light incident surface below the meniscus lens unit, which is close to the plate lens 520, is a convex surface, and the light emitting surface above the meniscus lens unit is a concave surface.

The material of the composite light diffusion lens 530 is high temperature resistant, infrared transmitting liquid silicone LSR, or infrared plastics such as infrared PMMA (polymethyl methacrylate), PP (polypropylene), PS (polystyrene), PA (polyamide), PC (polycarbonate), PE (polyethylene), ABS (acrylonitrile, butadiene, styrene terpolymer), K26R (COC optical plastics of japanese ruing-an), etc.

As shown in fig. 22, the light distribution method of the light distribution structure of embodiment 5 is: the light beams emitted from the high-angle LED light source 510 are converged by the aspherical lens 520. The converged light passes through the compound light dispersing lens 530 for light distribution, and the maximum light distribution angle is 170 degrees. Light spots output after the light distribution of each concave-convex lens unit are mutually overlapped to form large-angle rectangular uniform light spot distribution after superposition.

Example 6

The light distribution structure of the embodiment is composed of an LED light source 610, an aspheric lens 620, and a toric astigmatic lens 630, and can be used for a 3D time-of-flight sensor and a 2D photographing sensor of a mobile terminal. For computer games, AR/VB, intelligent automobile auxiliary driving system, unmanned aerial vehicle, robot of sweeping the floor, application occasions such as intelligent lock, the size requirement of its module is not so harsh, and its condensing lens adopts aspherical lens 620, and aspherical lens 620's upper and lower two sides are the aspheric surface, and it converges the light beam that LED sent. The compound astigmatic lens 630 is composed of a plurality of plano-convex lens cells arranged in a square shape. The light incident surface below the plano-convex lens unit, which is close to the plate lens 620, is a convex surface, the light emitting surface above the plano-convex lens unit is a plane, and after edge incident light is refracted by the convex surface, the included angle between the edge incident light and the optical axis exceeds 40 degrees. The maximum light distribution angle of the combined type light scattering lens 630 can reach 170 degrees, and the requirement of uniform illumination of a wide-angle (fish-eye) sensor can be met. The LED light source 610 has a large light emitting surface, and is generally 1mmx1mm or more. While it has a large beam angle, typically a Lambertian distribution around 120 °.

The material of the composite light diffusion lens 630 is high temperature resistant, infrared transmitting liquid silicone LSR, or infrared plastics such as infrared PMMA (polymethyl methacrylate), PP (polypropylene), PS (polystyrene), PA (polyamide), PC (polycarbonate), PE (polyethylene), ABS (acrylonitrile, butadiene, styrene terpolymer), K26R (COC optical plastics of japanese ruing-an), etc.

As shown in fig. 23, the light distribution method of the light distribution structure of embodiment 6 is: the light beams emitted from the high angle LED light source 610 are converged by the aspherical lens 620. The converged light passes through the composite light dispersing lens 630 for light distribution, and the maximum light distribution angle is 170 degrees. Light spots output after the light distribution of each plano-convex lens unit are mutually overlapped to form large-angle rectangular uniform light spot distribution after superposition.

Example 7

The light distribution structure of the embodiment is composed of an infrared vertical strong surface emitting laser diode (VCSEL)710 and a composite light scattering lens 720, and can be used for a mobile terminal 3D flight time sensor and a 2D photographing sensor. The light distribution method of example 7 is shown in fig. 24. The combined type light scattering lens 720 is composed of a plurality of concave-convex lens units, the maximum light distribution angle of the combined type light scattering lens can reach 170 degrees, and the requirement of uniform illumination of a wide-angle (fish-eye) sensor can be met. The compound astigmatic lens adopts free-form surfaces with different contour lines in XY directions. The arrangement of the plurality of meniscus lens units is a square arrangement. The light incident surface below the meniscus lens unit and near the light source is a convex surface, the light emergent surface above the meniscus lens unit is a concave surface, and edge incident light passes throughAfter refraction, the convex surface forms an angle with the optical axis of more than 40 degrees. A vertical cavity surface emitting laser diode (VCSEL)710 is the same as embodiment 1. The beam angle of the infrared vertical strong surface emitting laser diode (VCSEL)710 of example 7 is between 15 deg. and 60 deg.. Vertical cavity surface emitting laser VCSEL array, length L: 972 μm, width W: 680 μm, effective emitting surface length a: 479 μm, effective emission face width B: 575 μm, emission point lateral spacing Px: 52 μm, emission point longitudinal spacing Py: 30.5 μm, diameter of emission point

11 μm, number of emission points: 361, full angle of emission: 24 ° × 18 °.

The light distribution method of the plurality of concave-convex lens units comprises the following steps: it is used to distribute the light from the VCSEL array 710 uniformly over a large angle, with a maximum light distribution angle of 170 °. Light spots output after the light distribution of each concave-convex lens unit are mutually overlapped to form large-angle rectangular uniform light spot distribution after superposition.

The compound astigmatic lens 720 is composed of a plurality of free-form meniscus lens units, and it is preferable in example 7 that the meniscus lens units are shown in fig. 25 in a top isometric view and in fig. 26 in a bottom isometric view. 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 for light distribution on the light incident side is also a contour line having different curvatures, and 721X and 721Y thereof have different curvatures. The meniscus lens unit of the compound astigmatic lens 720 uses a free-form surface for: light distribution at different angles is generated in the X direction and the Y direction respectively.

The material of the composite light diffusion lens 720 is high temperature resistant and infrared transmitting liquid silicone LSR, or infrared plastics such as infrared PMMA (polymethyl methacrylate), PP (polypropylene), PS (polystyrene), PA (polyamide), PC (polycarbonate), PE (polyethylene), ABS (acrylonitrile, butadiene, styrene terpolymer), K26R (COC optical plastics of japanese ruing-an), etc.

Example 8

The light distribution structure of the embodiment is composed of an infrared vertical strong surface emitting laser diode (VCSEL)810 and a composite light scattering lens 820, and can be used for a mobile terminal 3D flight time sensor and a 2D photographing sensor. The compound astigmatic lens 820 is composed of a plurality of plano-convex lens units, the light incident surface below the plano-convex lens unit close to the light source is a convex surface, and the light emergent surface above the plano-convex lens unit is a plane. The light distribution curved surface on the light incidence 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 combined type light scattering lens 820 can reach 170 degrees, and the requirement of uniform illumination of a wide-angle (fish-eye) sensor can be met. One side of the plano-convex lens unit, which is close to the emission source, is a convex surface, and after edge incident light is refracted by the convex surface, the included angle between the edge incident light and the optical axis exceeds 40 degrees.

The vertical cavity surface emitting laser diode (VCSEL)810 is formed by arranging a plurality of vertical cavity emitting laser diodes in a square arrangement, and the emission wavelength is 940 nm. The beam angle of the infrared vertical strong surface emitting laser diode (VCSEL)810 is between 15 deg. and 60 deg.. Vertical cavity surface emitting laser VCSEL array 810 length L: 972 μm, width W: 680 μm, effective emitting surface length a: 479 μm, effective emission face width B: 575 μm, emission point lateral spacing Px: 52 μm, emission point longitudinal spacing Py: 30.5 μm, diameter of emission point

11 μm, number of emission points: 361, full angle of emission: 24 ° × 18 °.

The composite light scattering lens 820 is made of high temperature resistant and infrared transmitting liquid silicone rubber LSR, or infrared plastics such as infrared PMMA (polymethyl methacrylate), PP (polypropylene), PS (polystyrene), PA (polyamide), PC (polycarbonate), PE (polyethylene), ABS (acrylonitrile, butadiene, styrene terpolymer), K26R (COC optical plastics of japanese ruing-an), and the like.

A light distribution method of the light distribution structure of the present embodiment is shown in fig. 27.

The light distribution method of the plano-convex lens unit comprises the following steps: which is used to distribute the light from the VCSEL array 810 uniformly over a large angle with a maximum light distribution angle of 170. Light spots output after the light distribution of each plano-convex lens unit are mutually overlapped to form large-angle rectangular uniform light spot distribution after superposition.

An isometric bottom view of a plano-convex lens unit is shown in fig. 28. Wherein the light exit side 822 is planar. The convex surface 821 for light distribution on the light incident side thereof is a contour line having different curvatures, and 821X and 821Y thereof have different curvatures. The plano-convex lens unit of the compound astigmatic lens 820 adopts a free-form surface, and has the following functions: which can generate light distribution of different angles in the X and Y directions respectively.

The embodiment 3-8 is applied to flash lamps and night vision illumination of camera auxiliary illumination, the light source is one of a white light LED module and an infrared light LED module, a VCSEL infrared laser single-chip module, a VCSEL white light laser single-chip module, a VCSEL infrared laser array multi-chip module and a VCSEL white light laser array multi-chip module, the color temperature of the white light is 3500-15000K, and the wavelength of infrared light is 650-1500 nm. The light distribution structure of the scheme comprises at least one light source module and a composite light scattering lens, or more than two light source modules and the composite light scattering lens.

In addition, it should be noted that, in addition to the square arrangement in the above embodiment, the composite astigmatic lens may have other different arrangements, as shown in fig. 29 (a), 29 (b), 29 (c), and 29 (d). The combination of the meniscus lens units or the plano-convex lens units may be a quadrangle, a hexagon, or a circle, and may also be formed by simply arranging other polygons, which is not described in detail in this application. Any simple change in arrangement is deemed to infringe the scope of the claimed right of this patent. The lens profile of the compound astigmatic lens can be square, rounded quadrilateral, and circular, and it can have other different lens shapes in addition to the shapes of the above embodiments.

The above-mentioned embodiments are preferred embodiments of the present invention, and the present invention is not limited thereto, and any other modifications or equivalent substitutions that do not depart from the technical spirit of the present invention are included in the scope of the present invention.

Claims

1. A light distribution structure for auxiliary illumination and distance measurement is characterized by comprising: n emission modules and a composite astigmatic lens for uniformly distributing incident light, wherein N is more than or equal to 1;

the composite astigmatic lens is arranged right above the transmitting module; the light incident surface of the combined type astigmatic lens, which is close to the emission module, is a convex surface, and after the incident light rays incident to the edge of the combined type astigmatic lens are refracted by the convex surface, the included angle between the light rays and the optical axis exceeds 40 degrees.

2. The light distribution structure of claim 1, wherein the light distribution curved surface of the combined type light diffusion lens is a symmetric curved surface with the same contour lines in XY directions or a free curved surface with different contour lines in XY directions, and the light distribution curved surface is a convex surface.

3. The light distribution structure according to claim 1, wherein the emission module includes: an infrared vertical strong surface emitting laser diode and a substrate; the infrared vertical strong surface emitting laser diode is arranged on the upper surface of the substrate.

4. The light distribution structure of claim 3, wherein the VCSEL diodes are formed by arranging a plurality of VCSELs, the VCSELs 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 VCSELs is 650-1500 nm.

5. The light distribution structure of claim 3, wherein the compound light dispersing lens comprises: k meniscus lens units, K > 1; the light incident surface of the concave-convex lens unit close to the emission module is a convex surface, and the light emergent surface above the concave-convex lens unit is a concave surface.

6. The light distribution structure of claim 5, wherein the maximum light distribution angle of each meniscus lens unit is 170 °, and light spots output after light distribution of the meniscus lens units are overlapped with each other to form a rectangular uniform light spot distribution.

7. The light distribution structure of claim 1, wherein the composite light dispersing lens is made of liquid silicone rubber LSR or infrared plastic, and the infrared plastic is any one of infrared PMMA, PP, PS, PA, PC, PE, ABS and K26R.

8. The light distribution structure of claim 5, wherein the light beams emitted from the VCSEL are converged by the convex surface of the meniscus unit and then intersect near the concave surface, and the concave surface diffuses the light beams to form a spot distribution having a beam angle of 2 ψ.

9. The light distribution structure of claim 3, wherein the compound light dispersing lens comprises: l plano-convex lens cells, L > 1; the light incident surface of the plano-convex lens unit, which is close to the emission module, is a convex surface, and the light emergent surface of the plano-convex lens unit is a plane.

10. The light distribution structure of claim 9, wherein the maximum light distribution angle of the plurality of plano-convex lens units can also reach 170 degrees.

11. The light distribution structure according to claim 9, wherein the plurality of plano-convex lens units are arranged in a square.

12. The light distribution structure of claim 9, wherein the plurality of plano-convex lens units uniformly distribute light emitted from the vcsel diode, and light spots output after light distribution by each plano-convex lens unit are overlapped to form a rectangular uniform light spot distribution.

13. The light distribution structure of claim 9, wherein the light beams emitted from the vertical cavity surface emitting laser diode are converged through the light incident surface of the plano-convex lens unit, and then intersect near the plane of the plano-convex lens unit, and the plane diffuses the light beams to form a spot distribution having a beam angle of 2 ψ.

14. The light distribution structure according to claim 5, wherein the emission module includes: the light-emitting diode and the condensing lens are arranged between the light-emitting diode and the composite type light-dispersing lens.

15. The light distribution structure of claim 14, wherein the light emitting diode is an infrared LED or a visible light LED.

16. The light distribution structure according to claim 14, wherein the condenser lens is a flat lens, and the flat lens is any one of a fresnel lens in a sawtooth shape, a zone plate lens in a concentric ring shape, and a diffractive optical lens.

17. The light distribution structure of claim 16, wherein the light beams incident from the fresnel lens having a sawtooth shape converge through the incident surface of the meniscus lens unit, converge and intersect near the concave surface of the meniscus lens unit, and the concave surface diffuses the light beams to form a spot distribution having a beam angle of 2 ψ.

18. The light distribution structure of claim 17, wherein light beams incident from the fresnel lens in the sawtooth shape converge through the incident surface of the plano-convex lens unit, and intersect near the plane of the plano-convex lens unit after converging, and the plane output light beams form a light spot distribution with a total angle of 2 ψ.

19. The light distribution structure of claim 14, wherein the condenser lens is an aspheric lens and the light emitting diode is a patch LED.

20. The light distribution structure of claim 5, wherein the concave and convex surfaces of the meniscus unit have contours of different curvatures in both the X and Y directions.

21. The light distribution structure according to claim 9, wherein the light distribution curved surface of the plano-convex lens unit is a free-form surface with different contour lines in the XY direction, and the light distribution curved surface is a concave surface.

22. The light distribution structure of claim 1, wherein the combined arrangement of the combined type light dispersing lenses is any one of a quadrangle, a hexagon, a circle, a staggered arrangement and a random arrangement.

23. The light distribution structure of claim 1, wherein the shape of the compound light dispersing lens is any one of a square, a rounded quadrangle, an ellipse, a circle, and a polygon.

24. The light distribution structure of claim 1, wherein the emission module is a white light vertical intensity surface emitting laser diode and a substrate; the white light vertical strong 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 3500-15000K.

25. The light distribution structure of claim 1, wherein the light source module and the compound light dispersing lens are separately arranged or the light source module and the compound light dispersing lens are combined into an integrated module.

26. The light distribution structure of claim 3, wherein the infrared vertical strong surface emitting laser is an infrared laser single chip module or an infrared laser array multi-chip module.

27. The light distribution structure of claim 26, wherein the wavelength of the infrared light is 650-1500 nm, and the total beam angle of the light source output by the infrared laser single-chip module or the infrared laser array multi-chip module is 5-40 degrees.

28. Use of the light distribution structure according to any one of claims 1 to 27, wherein the light distribution structure is used for auxiliary illumination and uniform light distribution of a 3D flight time sensor and a 2D photographing sensor of a mobile terminal.

29. A light distribution method for auxiliary illumination and distance measurement is characterized by comprising the following steps:

30. A light distribution method according to claim 29, characterized by comprising:

the vertical cavity surface emitting laser diode outputs incident light, and after incident marginal light RS is refracted and distributed through the convex surface of a single concave-convex lens unit, the maximum included angle delta degrees and delta degrees larger than 40 degrees between the refracted light ST and the optical axis OZ are obtained; after the light rays ST are output through the concave surface, the maximum light distribution angle psi, psi & gtsin of the output light rays TU and the optical axis OZ^-1(n × sin (δ)), where n is the refractive index of the infrared material of the meniscus unit, and the concave surface is the secondary light distribution surface, and functions as a secondary beam expander.

31. A light distribution method as claimed in claim 30, wherein the refractive index n is 1.49, and the refractive index δ is 40 °, and the maximum light distribution angle ψ of the output light ray TU passing through the concave surface of the meniscus lens unit and the optical axis OZ is > 73.28.

32. A light distribution method according to claim 29, characterized by comprising:

the vertical cavity surface emitting laser diode outputs incident light, and when the incident marginal light RS is subjected to light distribution by the convex refraction of a single plano-convex lens unit, the incident marginal light RS is obtainedThe maximum included angle delta DEG, delta & gt 40 DEG between the refracted ray ST and the optical axis OZ; after the light rays ST are output from the light-emitting surface, the maximum light distribution angle psi, psi & gtsin between the output light rays TU and the optical axis OZ^-1(n sin (δ)), where n is the refractive index of the infrared material of the plano-convex lens cell.

33. The light distribution method of claim 32, wherein the refractive index n is 1.49, and the refractive index δ is 40 °, and the maximum light distribution angle ψ of the output light ray TU passing through the plane of the planoconvex lens unit and the optical axis OZ is > 73.28.

34. A light distribution method according to claim 29, characterized by comprising:

light beams emitted by the LED light source are converged by the serrated Fresnel lens; the converged light is subjected to light distribution through the composite light dispersing lens, and light spots output after light distribution of each concave-convex lens unit in the composite light dispersing lens are overlapped to form uniform light spot distribution after superposition.

35. A light distribution method according to claim 29, characterized by comprising:

light beams emitted by the LED light source are converged by the serrated Fresnel lens; the converged light rays are converged by the convex surface of the plano-convex lens unit, and the converged light rays are intersected with the plane of the plano-convex lens unit.

36. A light distribution method according to claim 29, characterized by comprising:

light beams emitted by the surface mounted LED light source are converged through the aspheric lens; the converged light passes through a composite type astigmatic lens; and (4) carrying out light distribution, wherein light spots output after the light distribution of each concave-convex lens unit are mutually overlapped to form rectangular uniform light spot distribution after superposition.