CN216901165U

CN216901165U - Light source module, structured light generator and depth camera

Info

Publication number: CN216901165U
Application number: CN202220533827.9U
Authority: CN
Inventors: 朱瑞; 朱健; 郝成龙; 谭凤泽
Original assignee: Shenzhen Metalenx Technology Co Ltd
Current assignee: Shenzhen Metalenx Technology Co Ltd
Priority date: 2022-03-11
Filing date: 2022-03-11
Publication date: 2022-07-05
Anticipated expiration: 2032-03-11

Abstract

The utility model provides a light source module, a structured light generator and a depth camera, wherein the light source module comprises: a vertical cavity surface emitting laser array and a superlens array; the vertical cavity surface emitting laser array comprises a plurality of vertical cavity surface emitting laser units, and the vertical cavity surface emitting laser units are used for emitting Gaussian beams; the super lens array comprises a plurality of super lens units which correspond to the vertical cavity surface emitting laser units one by one, the super lens array is arranged on the light emitting side of the vertical cavity surface emitting laser array, and the super lens units are used for shaping Gaussian beams into flat-topped beams. According to the light source module, the structured light generator and the depth camera provided by the embodiment of the utility model, the superlens array is used as the light source module of the tool for adjusting the Gaussian beam, so that the problem of pixel overexposure by adjusting the Gaussian beam into the flat-top beam can be well solved, and the light source module, the structured light generator and the depth camera have the advantages of light weight, thin overall thickness, simple system, lower price and high productivity.

Description

Light source module, structured light generator and depth camera

Technical Field

The utility model relates to the technical field of laser application, in particular to a light source module, a structured light generator and a depth camera.

Background

In daily life, we take pictures from pixels on a sensor, which process light into electrical signals that are combined to output a picture. When the captured object is too bright and a large amount of charge is squeezed within a single pixel, the resulting image is overexposed. The depth camera applied to the field of three-dimensional imaging also has the problem of over-exposure caused by overhigh pixel energy, and when the problem of over-exposure occurs, the depth information obtained through measurement is not accurate any more. One reason that the depth camera has the problem of overexposure is that the light source in the structured light generator is generally a laser light source, such as a common Vertical Cavity Surface Emitting Laser (VCSEL), and the light beam emitted by the laser light source is a gaussian light beam, and the energy distribution has a strong distribution rule in the middle and weak distribution rule in the periphery. When the receiving end imaging chip is applied to three-dimensional imaging, the receiving end imaging chip can receive speckle laser light sources reflected from the surface of an object, one speckle laser light source usually occupies a plurality of imaging pixels, the pixels received by the receiving end also usually show the phenomenon that the amplitudes of some pixels in the middle are large and the amplitudes of surrounding pixels are very weak, the phenomenon is similar to the Gaussian beam energy distribution rule, and for the pixel units in the middle, a large amount of charges are in a single pixel, so that the energy is too high to cause overexposure.

At present, a micro-lens array can be adopted to shape a Gaussian beam into a flat-top beam, and then the problem of pixel overexposure is solved. However, when a microlens array is used, the system complexity is high, the overall thickness is thick, and further miniaturization and thinning are difficult.

SUMMERY OF THE UTILITY MODEL

To solve the above problems, embodiments of the present invention provide a light source module, a structured light generator, and a depth camera.

In a first aspect, an embodiment of the present invention provides a light source module, including: a vertical cavity surface emitting laser array and a superlens array; the vertical cavity surface emitting laser array comprises a plurality of vertical cavity surface emitting laser units, and the vertical cavity surface emitting laser units are used for emitting Gaussian beams; the super lens array comprises a plurality of super lens units which are in one-to-one correspondence with the vertical cavity surface emitting laser units, the super lens array is arranged on the light emitting side of the vertical cavity surface emitting laser array, and the super lens units are used for shaping the Gaussian beams into flat-topped beams.

Optionally, the vertical cavity surface emitting laser array and the super lens array are uniform arrays, or the vertical cavity surface emitting laser array and the super lens array are random arrays.

Optionally, the superlens unit includes: the super-surface nano structure and the filling material filled around the super-surface nano structure; the super-surface nano structure is used for modulating the transmitted Gaussian beam into a flat-top beam; the filling material is transparent or semitransparent material in an operating waveband, and the absolute value of the difference between the refractive index of the filling material and the refractive index of the super-surface nano structure is greater than or equal to 0.5.

Optionally, the gaussian beam is infrared light.

In a second aspect, embodiments of the present invention further provide a structured light generator, including: the light source module and the optical projection module as described above; the light source module is used for emitting a flat-topped light beam; the optical projection module is arranged on the light-emitting side of the light source module and used for projecting the flat-top light beam emitted by the light source module into speckles.

Optionally, the optical projection module comprises: a collimating element and a diffractive element; the collimation element is arranged between the light source module and the diffraction element and is used for collimating the flat-top light beam emitted by the light source module; the diffraction element is used for projecting the collimated flat-top light beam into speckles.

Optionally, the collimating element comprises a collimating lens group or a first superlens; the diffractive element comprises a diffractive optical element or a second superlens; the collimation lens group or the first super lens is used for collimating the flat-top light beam emitted by the light source module; the diffractive optical element or the second superlens is used for projecting the collimated flat-top light beam into speckles.

Optionally, the optical projection module comprises: and the third super lens is arranged on the light outlet side of the light source module and used for collimating the flat-top light beam emitted by the light source module and projecting the collimated flat-top light beam into speckles.

In a third aspect, an embodiment of the present invention further provides a depth camera, including: a structured light generator, a receiving module and a processor as described in any of the above; the structured light generator is used for projecting speckles on a target; the receiving module is used for receiving the speckle structure light reflected by the target; the processor is connected to the structured light generator and the receiving module, respectively, for controlling the structured light generator and the receiving module.

Optionally, the structured light generator is multiple, and/or the receiving module is multiple.

The light source module provided by the embodiment of the utility model uses the superlens array as the light source module of the tool for adjusting the Gaussian beam, not only can the adjustment of the Gaussian beam into the flat-top beam be well realized, but also the light source module has the advantages of light weight, thin integral thickness, simple system, lower price and high productivity compared with the light source using the existing lens (such as a micro lens); the structured light generator provided by the embodiment of the utility model uses the light source module comprising the vertical cavity surface emitting laser array and the super lens array as the light source, and is combined with the optical projection module capable of projecting the flat-top light beam emitted by the light source module into speckles, so that the structured light generator with a lighter and thinner structure, a simple system, a lower price and high productivity is formed; according to the depth camera provided by the embodiment of the utility model, the structured light generator which is lighter and thinner is used, so that the depth camera can be made lighter, thinner and more miniaturized, the installation space can be further reduced, the overall weight of the depth camera is reduced, and the depth camera can be suitable for optical sensing terminals which have strict requirements on space, such as mobile phones, AR/VR equipment and the like.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram illustrating a light source module according to an embodiment of the utility model;

FIG. 2 is a graph illustrating a Gaussian beam energy distribution and a flat-top beam energy distribution in an embodiment of the present invention;

FIG. 3 is a schematic diagram illustrating a "VCSEL array and a Superlens array as a uniform array" in an embodiment of the present invention;

FIG. 4 is a schematic diagram illustrating an embodiment of the utility model in which the VCSEL array and the superlens array are random arrays;

FIG. 5 is a schematic diagram showing a detailed structure of a "superlens unit" in an embodiment of the present invention;

FIG. 6 shows a schematic layout of "super surface nanostructures" in an embodiment of the utility model;

fig. 7 shows a schematic structural diagram of a first structured light generator provided by an embodiment of the present invention;

fig. 8 shows a schematic structural diagram of a second structured light generator provided by an embodiment of the present invention;

fig. 9 shows a schematic structural diagram of a third structured light generator provided by an embodiment of the present invention;

fig. 10 shows a schematic structural diagram of a fourth structured light generator provided by an embodiment of the present invention;

fig. 11 shows a schematic structural diagram of a fifth structured light generator provided by an embodiment of the present invention;

fig. 12 is a schematic structural diagram of a depth camera according to an embodiment of the present invention.

Icon:

the optical system comprises a 1-vertical cavity surface emitting laser array, a 2-super lens array, a 3-light source module, a 4-optical projection module, a 5-structured light generator, a 6-receiving module, a 7-processor, a 11-vertical cavity surface emitting laser unit, a 21-super lens unit, a 211-super surface nano structure, 212-filling materials, a 41-collimation element, a 42-diffraction element, a 411-collimation lens group, a 412-first super lens, a 421-diffraction optical element, a 422-second super lens and a 43-third super lens.

Detailed Description

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

An embodiment of the present invention provides a light source module, as shown in fig. 1, the light source module includes: a vertical cavity surface emitting laser array 1 and a superlens array 2. Fig. 1 shows an example in which the lower side of the vertical cavity surface emitting laser array 1 is a light incident side and the upper side is a light emitting side.

As shown in fig. 1, the vertical cavity surface emitting laser array 1 includes a plurality of vertical cavity surface emitting laser units 11, the vertical cavity surface emitting laser units 11 being for emitting gaussian beams; the super lens array 2 includes a plurality of super lens units 21 corresponding to the vertical cavity surface emitting laser units 11 one to one, the super lens array 2 is disposed on the light exit side of the vertical cavity surface emitting laser array 1, and the super lens units 21 are used for shaping the gaussian beam into a flat-topped beam.

In the light source module provided in the embodiment of the present invention, an individual vertical cavity surface emitting laser may be referred to as a vertical cavity surface emitting laser unit 11, a gaussian beam may be emitted by using the vertical cavity surface emitting laser unit 11, and the energy distribution of the emitted gaussian beam exhibits a distribution rule of strong center and weak periphery, and the left diagram in fig. 2 represents "gaussian beam energy distribution". In the embodiment of the present invention, a plurality of vertical cavity surface emitting laser units 11 may be combined to form an array, that is, the vertical cavity surface emitting laser array 1 may be obtained, and each vertical cavity surface emitting laser unit 11 in the vertical cavity surface emitting laser array 1 may be capable of emitting a gaussian beam. A superlens array 2 is provided on the light exit side of the vertical cavity surface emitting laser array 1 provided in the embodiment of the present invention, the super lens array 2 is an array composed of a plurality of super lens units 21, and each super lens unit 21 in the super lens array 2 corresponds to each vertical cavity surface emitting laser unit 11 in the vertical cavity surface emitting laser array 1, so that each superlens unit 21 in the superlens array 2 can receive the gaussian light beam emitted by each vcsel unit 11 in the vcsel array 1, to realize modulation of the gaussian light beam incident to each superlens unit 21, therefore, the Gaussian beam can be shaped into the flat-top beam, the energy distribution is obtained and is presented in a more uniform flat-top distribution mode, and the right diagram in fig. 2 shows the energy distribution of the flat-top beam.

The light source module which uses the super lens array as a tool for adjusting the Gaussian beam and is adopted by the embodiment of the utility model not only can well adjust the Gaussian beam into the flat-top beam, but also has the advantages of light weight, thin overall thickness, simple system, lower price and high productivity compared with the light source using the existing lens (such as a micro lens).

Optionally, the vertical cavity surface emitting laser array 1 and the super lens array 2 are uniform arrays, or the vertical cavity surface emitting laser array 1 and the super lens array 2 are random arrays.

Referring to fig. 3, the vcsel array 1 may be a uniform array, that is, each vcsel unit 11 (shown by a square pattern in fig. 3) in the vcsel array 1 is uniformly distributed and arranged, so that the vcsel array 1 formed by the combination is a uniform array. Since each superlens unit 21 in the superlens array 2 corresponds to each vertical cavity surface emitting laser unit 11 in the vertical cavity surface emitting laser array 1, each superlens unit 21 (shown by a circular pattern in fig. 3) in the superlens array 2 is also uniformly distributed and arranged, so that the combined superlens array 2 is also a uniform array.

Alternatively, as shown in fig. 4, the vcsel array 1 provided in the embodiment of the present invention is a random array, that is, each vcsel unit 11 in the vcsel array 1 is randomly distributed and arranged, so that the vcsel array 1 formed by the combination is a random array. Since each superlens unit 21 in the superlens array 2 corresponds to each vertical cavity surface emitting laser unit 11 in the vertical cavity surface emitting laser array 1, each superlens unit 21 in the superlens array 2 is also randomly distributed and arranged, so that the combined superlens array 2 is also a random array.

Compared with the micro lens array processed by the prior art, the micro lens array adopted by the embodiment of the utility model is uniformly distributed and is only suitable for the uniform vertical cavity surface emitting laser array, and the micro lens array is not suitable when the light source of the structured light generator selects the random vertical cavity surface emitting laser array, but the embodiment of the utility model adopts the super lens array 2 as a tool for adjusting the Gaussian beam, the manufacturing process of the super lens adopts the semiconductor photoetching process for processing, the process is easy to process the random super lens array, and the limitation that only the uniform vertical cavity surface emitting laser array is used as the light source can be broken.

Optionally, the superlens unit 21 includes: a super surface nanostructure 211 and a filling material 212 filled around the super surface nanostructure; the super-surface nano structure 211 is used for modulating the transmitted Gaussian beam into a flat-top beam; the filler material 212 is a transparent or translucent material in the operating band, and an absolute value of a difference between a refractive index of the filler material 212 and a refractive index of the super-surface nanostructures 211 is greater than or equal to 0.5.

In the embodiment of the present invention, in the working wavelength band of the vcsel unit 11 in the vcsel array 1, each superlens unit 21 in the superlens array is transparent, i.e. has high transmittance for the light in the working wavelength band; for example, if the vertical cavity surface emitting laser array 1 is used in an imaging system, the operating band may be a visible light band, a near infrared band, or the like. Referring to fig. 5, the superlens unit 21 includes a super-surface nanostructure 211 and a filling material 212 filled around the super-surface nanostructure 211, wherein the super-surface nanostructure 211 can perform shaping modulation on an incident light beam, for example, the incident gaussian light beam can be adjusted to a flat-top light beam, and the super-surface nanostructure 211 is a full-medium structure unit; the materials used for the super-surface nanostructure 211 include: at least one of titanium oxide, silicon nitride, fused silica, aluminum oxide, gallium nitride, gallium phosphide, amorphous silicon, crystalline silicon, and hydrogenated amorphous silicon. The filling material 212 filled around the super-surface nano-structure 211 is also a material transparent or semi-transparent in the working wavelength band, i.e. the filling material 212 has high transmittance or transmittance between 40% and 60% for the light (such as infrared light) in the working wavelength band, so as to protect the nano-scale super-surface nano-structure 211. The absolute value of the difference between the refractive index of the filling material 212 and the refractive index of the super-surface nano-structure 211 is greater than or equal to 0.5, so as to avoid the filling material 212 from influencing the light modulation effect.

In the embodiment of the present invention, the super-surface nanostructures 211 are arranged in an array, and are divided into a plurality of super-surface structure units by a dividing manner, the super-surface structure units may be regular hexagons and/or squares, and the super-surface nanostructures 211 are disposed at the central position of each super-surface structure unit, or at the central position and the vertex position of each super-surface structure unit. Referring to fig. 6, a division manner of the super surface structure unit is schematically shown by a dotted line, in fig. 5, the super surface structure unit is a square, which includes the super surface nano structure 211 and the filling material 212, and the super surface nano structure 211 is located at a central position of the super surface structure unit. In addition, the super-surface nano-structure 211 may have a cylindrical shape, a square column shape, etc., which may be determined based on actual situations.

Optionally, the gaussian beam is infrared light.

The operating band of the vertical cavity surface emitting laser unit 11 in the vertical cavity surface emitting laser array 1 is a band corresponding to infrared light, that is, the gaussian beam emitted by the vertical cavity surface emitting laser unit 11 in the vertical cavity surface emitting laser array 1 is infrared light. The embodiment of the utility model selects infrared light as the modulated light beam to better meet the requirement of subsequently manufacturing the structured light, and because the infrared light is invisible light for human eyes, the flat-top light beam obtained by modulation and shaping and the subsequently projected structured light are invisible and have no interference; in addition, the projection of the structured light can be carried out in a dark environment (such as night or a weak environment).

Embodiments of the present invention further provide a structured light generator, as shown in fig. 7, including: the light source module 3 and the optical projection module 4 are described above. The light source module 3 is used for emitting a flat-top light beam; the optical projection module 4 is disposed on the light emitting side of the light source module 3, and is configured to project the flat-top light beam emitted by the light source module 3 into speckles.

In the embodiment of the present invention, the structured light generator includes a light source module 3 and an optical projection module 4, the light source module 3 includes a vertical cavity surface emitting laser array 1 and a super lens array 2, and the light source module 3 can emit a flat-top light beam. An optical projection module 4 may be disposed on the light exit side of the light source module 3, and the optical projection module 4 may project the flat-top light beam emitted from the light source module 3 into speckles, for example, may adjust the flat-top light beam emitted from the light source module 3 into a structured light pattern (such as speckles) to be projected outward. Fig. 7 shows an example in which the upper side of the light source module 3 is the light exit side.

The embodiment of the utility model uses the light source module 3 comprising the vertical cavity surface emitting laser array 1 and the super lens array 2 as a light source, and is combined with the optical projection module 4 capable of projecting the flat-top light beam emitted by the light source module 3 into speckles, so that the structured light generator with a lighter and thinner structure, a simple system, a lower price and a high productivity is formed.

Optionally, the optical projection module 4 comprises: a collimating element 41 and a diffractive element 42; the collimating element 41 is disposed between the light source module 3 and the diffraction element 42, and is configured to collimate the flat-top light beam emitted by the light source module 3; the diffractive element 42 is used to project the collimated flat-top beam as speckle.

In the embodiment of the present invention, the optical projection module 4 required for forming the structured light generator by combining with the light source module 3 may include: a collimating element 41 and a diffractive element 42. Referring to fig. 8, taking the upper side of the light source module 3 as the light-emitting side thereof and the lower side of the diffractive element 42 as the light-entering side thereof as an example, the collimating element 41 may be disposed between the light-emitting side of the light source module 3 and the light-entering side of the diffractive element 42, and the collimating element 41 may be configured to receive the flat-top light beam emitted by the light source module 3 and collimate the flat-top light beam. The diffraction element 42 included in the optical projection module 4 can receive the flat-top beam emitted by the collimating element 41 after being collimated, and project the flat-top beam as a speckle, for example, the flat-top beam emitted by the collimating element 41 can be adjusted to be a speckle structure light to be projected outward, such as to a target object or a target area.

The optical projection module 4 provided in the embodiment of the present invention may include two parts, one part is a collimating element 41 capable of collimating the flat-top beam emitted from the light source module 3, and the other part is a diffraction element 42 capable of projecting the collimated flat-top beam into speckles, which can make the speckles emitted by final projection more uniform and standard.

Optionally, the collimating element 41 comprises a collimating lens group 411 or a first superlens 412; the diffractive element 42 includes a diffractive optical element 421 or a second superlens 422; the collimating lens group 411 or the first superlens 412 is used for collimating the flat-top light beam emitted by the light source module 3; the diffractive optical element 421 or the second superlens 422 is used to project the collimated flat-top beam as speckle.

In the embodiment of the present invention, the collimating element 41 may be a collimating lens group 411 or may also be a first super lens 412, and the collimating lens group 411 and the first super lens 412 both have the same function and are used for collimating the flat-topped light beam emitted by the light source module 3. The collimating lens assembly 411 is an optical device composed of a plurality of lenses for aligning a light beam (e.g. a flat-top light beam) in a specific direction to form a collimated light beam or a parallel light beam, so that the light beam (e.g. the flat-top light beam) does not spread with distance or at least the spreading degree is minimized. When the collimating element 41 is the first super lens 412, the first super lens 412 can achieve the same overall effect as the collimating lens group 411, and the details are not repeated herein.

In the embodiment of the present invention, the diffractive element 42 may be a diffractive optical element 421 or may also be a second superlens 422, and the diffractive optical element 421 and the second superlens 422 both have the same function and are used for projecting the collimated flat-top beam as speckle to irradiate on the target object or the target area. Among them, Diffractive Optical Elements (DOE) are mainly used for laser beam shaping, such as homogenization, focusing, forming a specific pattern, and the like. In an embodiment of the present invention, the diffractive optical element 421 is used to form a speckle projection from a collimated light beam (e.g., a flat-top light beam). When the diffraction element 42 is the second superlens 422, the second superlens 422 can achieve the same overall effects as the diffraction optical element 421, and has all the advantages of the superlens, such as slimmer structure, simpler system, lower price, high productivity, and the like, which are not described herein again.

Fig. 9 is a view showing an example of the structure of a structured light generator using a collimating lens group 411 as a collimating element 41 and a diffractive optical element 421 as a diffractive element 42, and fig. 10 is a view showing an example of the structure of a structured light generator using a first superlens 412 as a collimating element 41 and a second superlens 422 as a diffractive element 42. In the embodiment of the present invention, the collimating lens group 411 as the collimating element 41 and the second superlens 422 as the diffraction element 42 may also be used to form a structured light generator; alternatively, the structured light generator may be configured by using the first superlens 412 as the collimating element 41 and the diffractive optical element 421 as the diffractive element 42, so that the structured light generator with a thinner profile, a simpler system, a lower price and a better effect can be obtained.

Optionally, the optical projection module 4 comprises: the third super lens 43 is disposed on the light exit side of the light source module 3, and is configured to collimate the flat-top light beam emitted by the light source module 3 and project the collimated flat-top light beam into speckles.

Referring to fig. 11, in the structured light generator proposed in this embodiment, the optical projection module 4 may include: fig. 11 shows the third superlens 43 with the upper side of the light source module 3 as the light exit side. The third super lens 43 is a super lens capable of simultaneously collimating the flat-top light beam emitted from the light source module 3 and projecting the collimated flat-top light beam outward to form speckles. By using the third superlens 43 as the optical projection module 4, the overall thickness of the structured light generator can be further reduced, and the structured light generator can be made thinner.

An embodiment of the present invention further provides a depth camera, as shown in fig. 12, including: any of the embodiments described above provides a structured light generator 5, a receiving module 6 and a processor 7; wherein the structured light generator 5 is used to project speckle on the target; the receiving module 6 is used for receiving the speckle structure light reflected by the target; the processor 7 is connected to the structured light generator 5 and the receiving module 6, respectively, for controlling the structured light generator 5 and the receiving module 6.

On the basis of any of the above-mentioned structured light generators 5, in combination with the receiving module 6 and the processor 7, a depth camera can be generated, respectively, in which the processor 7 is used to connect and control the structured light generator 5 and the receiving module 6, and a main board can also be provided between the processor 7 and the structured light generator 5 and the receiving module 6, and the main board plays a role of supporting and fixing the above-mentioned components. When 3D shooting of an object (such as a human face) or an area is required, the object or the area can be used as a target, and the structured light generator 5 projects speckle on the target; after the speckle structure light is uniformly distributed on the target surface, the speckle structure light reflected by the target surface can be received by the receiving module 6, and the processor 7 performs subsequent processing on the speckle structure light fed back by the target received by the receiving module 6, for example, the depth of the target can be calculated according to the relative positions of the speckles.

The depth camera provided by the embodiment of the utility model uses the lighter and thinner structured light generator, so that the depth camera can be made lighter, thinner and more miniaturized, the installation space can be further reduced, the overall weight of the depth camera is reduced, and the depth camera can be suitable for optical sensing terminals with strict requirements on space, such as mobile phones, AR/VR equipment and the like.

Optionally, the number of structured light generators 5 is multiple, and/or the number of receiving modules 6 is multiple.

The number of the structured light generators 5 provided in the embodiment of the present invention may be multiple, so as to realize the projection of speckles to different targets, or the projection of speckles to larger targets; moreover, the number of the receiving modules 6 may be multiple, so as to respectively receive the speckles projected by each structured light generator 5 reflected by different targets (or targets with larger area). The arrangement can meet the requirement of carrying out speckle projection and reception on a larger-area target or more targets at the same time, and 3D shooting is better realized.

The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention, and the present invention shall be covered by the claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A light source module, comprising: a vertical cavity surface emitting laser array (1) and a super lens array (2);

the vertical cavity surface emitting laser array (1) comprises a plurality of vertical cavity surface emitting laser units (11), and the vertical cavity surface emitting laser units (11) are used for emitting Gaussian beams;

the super lens array (2) comprises a plurality of super lens units (21) which are in one-to-one correspondence with the vertical cavity surface emitting laser units (11), the super lens array (2) is arranged on the light emergent side of the vertical cavity surface emitting laser array (1), and the super lens units (21) are used for shaping the Gaussian beam into a flat-top beam.

2. The light source module according to claim 1, wherein the vertical cavity surface emitting laser array (1) and the super lens array (2) are uniform arrays, or the vertical cavity surface emitting laser array (1) and the super lens array (2) are random arrays.

3. The light source module according to claim 1, wherein the superlens unit (21) comprises: a super surface nanostructure (211) and a filling material (212) filled around the super surface nanostructure (211);

the super-surface nano structure (211) is used for modulating the transmitted Gaussian beam into a flat-top beam;

the filling material (212) is transparent or semitransparent material in a working waveband, and the absolute value of the difference between the refractive index of the filling material (212) and the refractive index of the super-surface nanostructure (211) is greater than or equal to 0.5.

4. The light source module of claim 1, wherein the Gaussian beam is infrared light.

5. A structured light generator, comprising: a light source module (3) according to any one of claims 1 to 4, and an optical projection module (4);

the light source module (3) is used for emitting a flat-top light beam;

the optical projection module (4) is arranged on the light outlet side of the light source module (3) and used for projecting the flat-top light beam emitted by the light source module (3) into speckles.

6. A structured light generator according to claim 5, wherein the optical projection module (4) comprises: a collimating element (41) and a diffractive element (42);

the collimation element (41) is arranged between the light source module (3) and the diffraction element (42) and is used for collimating the flat-top light beam emitted by the light source module (3);

the diffractive element (42) is configured to project the collimated flat-topped beam as speckle.

7. The structured light generator according to claim 6, wherein the collimating element (41) comprises a collimating lens group (411) or a first superlens (412); the diffractive element (42) comprises a diffractive optical element (421) or a second superlens (422);

the collimating lens group (411) or the first super lens (412) is used for collimating the flat-top light beam emitted by the light source module (3);

the diffractive optical element (421) or the second superlens (422) is configured to project the collimated flat-top beam as speckle.

8. A structured light generator according to claim 5, wherein the optical projection module (4) comprises: and the third super lens (43) is arranged on the light outlet side of the light source module (3) and used for collimating the flat-top light beam emitted by the light source module (3) and projecting the collimated flat-top light beam into speckles.

9. A depth camera, comprising: a structured light generator (5) according to any of claims 5-8, a receiving module (6) and a processor (7);

the structured light generator (5) is used for projecting speckles on an object;

the receiving module (6) is used for receiving the speckle structure light reflected by the target;

the processor (7) is connected to the structured light generator (5) and the receiving module (6), respectively, for controlling the structured light generator (5) and the receiving module (6).

10. Depth camera according to claim 9, characterized in that the number of structured light generators (5) is multiple and/or the number of receiving modules (6) is multiple.