WO2020103507A1

WO2020103507A1 - Projection module, imaging device, and electronic apparatus

Info

Publication number: WO2020103507A1
Application number: PCT/CN2019/102157
Authority: WO
Inventors: 林君翰; 李宗政; 陈冠宏; 周祥禾
Original assignee: 南昌欧菲生物识别技术有限公司
Priority date: 2018-11-20
Filing date: 2019-08-23
Publication date: 2020-05-28

Abstract

A projection module (10), an imaging device (100), and an electronic apparatus (1000). The projection module (10) comprises a light source (12) and a microlens array element (14) disposed on an optical path. The microlens array element (14) comprises a substrate (142). The substrate (142) comprises a first surface (1422) and a second surface (1424) facing away from each other. The first surface (1422) is provided with a first strip-shaped microlens array (144), and the second surface (1424) is provided with a second strip-shaped microlens array (146). The first strip-shaped microlens array (144) comprises a plurality of first strip-shaped microlenses (1442), and the second strip-shaped microlens array (146) comprises a plurality of second strip-shaped microlenses (1462). The arrangement direction of the plurality of first strip-shaped microlenses (1442) and the arrangement direction of the plurality of second strip-shaped microlenses (1462) intersect with each other to form an included angle.

Description

Projection module, imaging device and electronic equipment

Priority information

This application requests the priority and rights of the patent applications filed on November 20, 2018 to the State Intellectual Property Office of China with application numbers 201821915190.X and 201811382469.0, and the entire contents of which are incorporated herein by reference.

Technical field

The present application relates to the field of imaging technology, and in particular, to a projection module, imaging device, and electronic equipment.

Background technique

In structured light imaging technology, the Diffractive Optical Elements (DOE) in the projection module replicates the light beam emitted by the light source at a certain multiple and then projects the light toward the target object. The image sensor of the receiving module receives the reflection from the target object The light beam can then calculate the three-dimensional contour information of the target object according to the change of the light information. However, the design and manufacture of diffractive optical elements are difficult, and the quality of the finished product is difficult to control, which will affect the mass production of structured light imaging devices, and at the same time make the cost of structured light imaging devices higher.

Summary of the invention

Embodiments of the present application provide a projection module, imaging device, and electronic equipment.

The projection module according to the embodiment of the present application includes a light source and a microlens array element disposed on the optical path of the light source. The microlens array element includes a substrate. The substrate includes a first side and a second side opposite to each other. The first surface is provided with a first strip microlens array, and the second surface is provided with a second strip microlens array. The first strip microlens array includes a plurality of first strip microlenses, and the second strip microlens array includes a plurality of second strip microlenses. The arrangement direction of the plurality of first strip-shaped microlenses and the arrangement direction of the plurality of second strip-shaped microlenses intersect to form an included angle, that is, non-parallel.

In the projection module of the embodiment of the present application, after the light emitted by the light source is refracted twice by the microlens array element, a uniformly arranged point-like structured light pattern can be obtained. Therefore, microlens array elements can be used instead of diffractive optical elements. The manufacturing difficulty of the microlens array element is low and the technology is mature, which can realize mass production of the structured light imaging device, and at the same time can reduce the cost of the structured light imaging device.

In some embodiments, the arrangement direction of the plurality of first strip-shaped microlenses is perpendicular to the arrangement direction of the plurality of second strip-shaped microlenses. In this way, the structured light pattern obtained after the light emitted by the light source is refracted twice by the microlens array element is better.

In some embodiments, the surface shape of the first strip microlens includes a cylinder, and the surface shape of the second strip microlens includes a cylinder. In this way, both the first strip microlens and the second strip microlens may be cylindrical microlenses.

In some embodiments, the cross-sectional profile of the first strip-shaped microlens is an arc, and the cross-sectional profile of the second strip-shaped microlens is an arc, and the arc includes a circular arc, an elliptical arc, and Hyperbolic arc. In this way, the surface shapes of the first strip-shaped microlens and the second strip-shaped microlens can have various designs to meet different requirements.

In some embodiments, the surface shape of the first strip microlens and the surface shape of the second strip microlens are the same or different. In this way, many different microlens array elements can be designed.

In some embodiments, the light source is an edge-emitting laser, and the projection module includes a prism, and the prism is disposed on the optical path of the light source and used to reflect light emitted by the light source to the microlens array element . In this way, the use of an edge-emitting laser as the light source is simple and low-cost.

In some embodiments, the light source is a vertical cavity surface emitting laser. In this way, the vertical cavity surface emitting laser is used as the light source, and the projection distance of the laser is long.

In some embodiments, the projection module includes a circuit board, and the light source is disposed on the circuit board and electrically connected to the circuit board. In this way, the power supply can be connected to the light source through the circuit board to supply power to the light source, while the circuit board can provide support for the light source.

In some embodiments, the projection module includes a lens barrel. The lens barrel is disposed on the circuit board and forms a receiving space with the circuit board. The light source and the microlens array element are accommodated in the accommodation space. In this way, the light source and the micro lens array element are protected.

The imaging device according to the embodiment of the present application includes a projection module and a receiving module. The projection module is used to project light to the target object, and the receiving module is used to receive light reflected by the target object. The projection module includes a light source and a micro lens array element disposed on the optical path of the light source. The microlens array element includes a substrate. The substrate includes a first side and a second side opposite to each other. The first surface is provided with a first strip microlens array, and the second surface is provided with a second strip microlens array. The first strip microlens array includes a plurality of first strip microlenses, and the second strip microlens array includes a plurality of second strip microlenses. The arrangement direction of the plurality of first strip-shaped microlenses and the arrangement direction of the plurality of second strip-shaped microlenses intersect to form an included angle, that is, non-parallel.

In the imaging device according to the embodiment of the present application, the light emitted by the light source can be refracted twice by the microlens array element to obtain uniformly arranged light patterns with point-like distribution structures. Therefore, microlens array elements can be used instead of diffractive optical elements. The manufacturing difficulty of the microlens array element is low and the technology is mature, which can realize mass production of the structured light imaging device, and at the same time can reduce the cost of the structured light imaging device.

In some embodiments, the cross-sectional profile of the first strip-shaped microlens is arc-shaped, and the cross-sectional profile of the second strip-shaped microlens is arc-shaped. Hyperbolic arc. In this way, the surface shapes of the first strip-shaped microlens and the second strip-shaped microlens can have various designs to meet different requirements.

In some embodiments, the imaging device includes a processor. The processor is connected to the projection module and the receiving module. The processor is used to process the light reflected by the target object to obtain depth information of the target object. In this way, the depth information of the target object can be obtained.

The electronic device according to the embodiment of the present application includes a housing and the imaging device described in the above embodiment. The imaging device is mounted on the housing.

In the electronic device according to the embodiment of the present application, the light emitted by the light source can be refracted twice by the microlens array element to obtain uniformly arranged light patterns with point-like distribution structures. Therefore, microlens array elements can be used instead of diffractive optical elements. The manufacturing difficulty of the microlens array element is low and the technology is mature, which can realize mass production of the structured light imaging device, and at the same time can reduce the cost of the structured light imaging device.

Additional aspects and advantages of the present application will be partially given in the following description, and some will become apparent from the following description, or be learned through practice of the present application.

BRIEF DESCRIPTION

The above and / or additional aspects and advantages of the present application will become obvious and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

1 is a schematic structural diagram of a projection module according to an embodiment of the present application;

2 is another schematic structural diagram of a projection module according to an embodiment of the present application;

3 is a perspective structural view of a microlens array element according to an embodiment of the present application;

4 is a schematic diagram of the structured light pattern projected by the projection module of the embodiment of the present application;

5 is a schematic structural diagram of an imaging device according to an embodiment of the present application;

6 is a schematic structural diagram of an electronic device according to an embodiment of the present application;

7 is another schematic structural diagram of an electronic device according to an embodiment of the present application.

Symbol description of main components:

Projection module 10, light source 12, microlens array element 14, substrate 142, first surface 1422, second surface 1424, first strip microlens array 144, first strip microlens 1442, second strip micro Lens array 146, second strip microlens 1462, prism 16, circuit board 18, lens barrel 11;

Imaging device 100, receiving module 20, processor 30, projection window 40, acquisition window 50;

Electronic device 1000, housing 200.

detailed description

The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, in which the same or similar reference numerals indicate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary, and are only used to explain the present application, and cannot be construed as limiting the present application.

In the description of this application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back, "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise" etc. The positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, Therefore, it cannot be understood as a limitation to this application. In addition, the terms “first” and “second” are used for description purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise specifically limited.

In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be fixed connection or detachable Connect, or connect integrally. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the connection between two elements or the interaction between two elements. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.

Please refer to FIGS. 1 to 3. The projection module 10 according to the embodiment of the present application includes a light source 12 and a microlens array element 14 disposed on the optical path of the light source 12. The microlens array element 14 includes a substrate 142. The substrate 142 includes a first side 1422 and a second side 1424 opposite to each other. The first surface 1422 is provided with a first strip microlens array 144, and the second surface 1424 is provided with a second strip microlens array 146. The first strip microlens array 144 includes a plurality of first strip microlenses 1442, and the second strip microlens array 146 includes a plurality of second strip microlenses 1462. The arrangement direction of the plurality of first strip-shaped microlenses 1442 and the arrangement direction of the plurality of second strip-shaped microlenses 1462 cross to form an included angle, that is, they are not arranged in parallel.

In the projection module 10 of the embodiment of the present application, the light emitted by the light source 12 can be refracted twice by the microlens array element 14 to obtain a uniformly arranged light pattern with a point-like distribution structure (as shown in FIG. 4). Therefore, the microlens array element 14 can be used instead of the diffractive optical element. The manufacturing difficulty of the microlens array element 14 is relatively low and the technology is mature, which can realize mass production of the structured light imaging device, and at the same time can reduce the cost of the structured light imaging device.

It can be understood that, in the embodiment of the present application, the arrangement direction of the plurality of first strip-shaped microlenses 1442 and the arrangement direction of the plurality of second strip-shaped microlenses 1462 are non-parallel. The light source 12 of the projection module 10 generates light, enters the first stripe microlens array 144, the light is refracted for the first time through a plurality of first stripe microlenses 1442, and then enters the second stripe microlens array 146, the light passes A plurality of second strip-shaped microlenses 1462 are refracted for the second time (different from the direction of the first refraction) to form a uniformly arranged dot-shaped distribution structure light pattern and projected onto the target object.

In the projection module 10 of the present application, the microlens array element 14 is used instead of the diffractive optical element to project the structured light pattern to the target object. The light emitted by the light source 12 can directly enter the microlens array element 14 without collimating element to collimate The light emitted by the light source 12 can further reduce the cost of the projection module 10.

It should be noted that the plurality of first strip-shaped microlenses 1442 are arranged in the same direction, and the plurality of second strip-shaped microlenses 1462 are also arranged in the same direction. The arrangement direction of the plurality of first strip-shaped microlenses 1442 and the arrangement direction of the plurality of second strip-shaped microlenses 1462 are not parallel, which means that the arrangement direction of the plurality of first strip-shaped microlenses 1442 is The arrangement direction of the second strip-shaped microlenses 1462 is staggered at an angle (greater than 0 degrees and less than 180 degrees). In FIGS. 1 and 2, the broken line with an arrow indicates the optical path of the light source 12, and the direction of the arrow indicates the direction of light projection.

Further, before fabricating the microlens array element 14, software can be used to model and set parameters such as the size, arrangement pitch and arrangement direction of the plurality of first stripe microlenses 1442 and the plurality of second stripe microlenses 1462, Then the structured light pattern is projected through software simulation. Therefore, through continuous modeling and simulation, the optimal design parameters of the microlens array element 14 can be obtained, and then the microlens array element 14 can be produced. In this way, the yield of the microlens array element 14 can be improved, and waste of resources can be avoided.

The first stripe-shaped microlens array 144 and the second stripe-shaped microlens array 146 are respectively formed on two surfaces of the substrate 142 opposite to each other. Specifically, a plurality of first strip-shaped microlenses 1442 can be arranged on the first surface 1422 of the substrate 142 in the same direction by mold injection or nano-imprinting, and can be injected by mold injection or nano-imprinting The plurality of second strip-shaped microlenses 1462 are arranged on the second surface 1424 of the substrate 142 in the same direction (different from the arrangement direction of the plurality of first strip-shaped microlenses 1442).

Preferably, the arrangement direction of the plurality of first strip-shaped microlenses 1442 is perpendicular to the arrangement direction of the plurality of second strip-shaped microlenses 1462. In this way, the structured light pattern obtained after the light emitted by the light source 12 is refracted twice by the microlens array element 14 is better.

In some embodiments, the surface shape of the first strip microlens 1442 includes a cylindrical surface. The surface shape of the second strip-shaped microlens 1462 includes a cylindrical surface. That is, the first strip-shaped microlens 1442 is a cylindrical microlens, further, the cross-sectional profile of the first strip-shaped microlens 1442 is arc-shaped; and / or, the second strip-shaped microlens 1462 is a cylindrical microlens, Further, the cross-sectional profile of the second strip-shaped microlens 1462 is arc-shaped. Wherein, the arc includes a circular arc (such as flat convex cylindrical microlens, flat concave cylindrical microlens), elliptical arc (such as flat convex cylindrical microlens, flat concave cylindrical microlens) and a hyperbolic arc (such as (Double convex cylindrical microlens, double concave cylindrical microlens). For example, the cross-sectional profile of the strip microlens is a circular arc, which means that the cross section of the strip microlens is an arc-shaped structure with a fixed radius. Of course, the arc can also be any other curved structure, as long as its optical performance meets the requirements of refraction. In addition, it should be noted that different positions of the first strip microlens 1442 or the second strip microlens 1462 on the same strip structure may also exhibit different radii, that is, the radius of the same strip structure It can be changed, and the design can be adjusted accordingly according to the needs of the optical route.

As such, the surface shapes of the first strip-shaped microlens 1442 and the second strip-shaped microlens 1462 can have various designs to meet different requirements. It can be understood that when the cross-sectional profile of the cylindrical microlens is a non-circular arc, spherical aberration and chromatic aberration can be effectively reduced. For example, in the first strip-shaped microlens array 144, the surface shapes of the plurality of first strip-shaped microlenses 1442 may all be cylindrical surfaces, may be all elliptic cylindrical surfaces or hyperbolic cylindrical surfaces, or may be partially cylindrical surfaces. Some are elliptic cylinders or hyperbolic cylinders. In the second strip-shaped microlens array 146, the surface shapes of the plurality of second strip-shaped microlenses 1462 may all be cylindrical surfaces, may be all elliptic cylindrical surfaces or hyperbolic cylindrical surfaces, or may be partially cylindrical surfaces and partially Elliptic cylinder or hyperbolic cylinder. Preferably, the first stripe microlens arrays 144 all use a cylindrical first microlens 1442, and the second stripe microlens arrays 146 all use a second cylindrical microlens 1462.

In some embodiments, the surface shape of the first strip microlens 1442 and the surface shape of the second strip microlens 1462 are the same or different.

In this way, a variety of different microlens array elements 14 can be designed. Specifically, when the surface shape of the first strip microlens 1442 and the surface shape of the second strip microlens 1462 are the same, the surface shape of the first strip microlens 1442 and the surface shape of the second strip microlens 1462 can be They are all cylindrical surfaces, they can all be elliptic cylindrical surfaces, or they can all be hyperbolic cylindrical surfaces. When the surface shape of the first strip-shaped microlens 1442 and the surface shape of the second strip-shaped microlens 1462 are different, it may be that the surface shape of the first strip-shaped microlens 1442 is a cylindrical surface, and the surface shape of the second strip-shaped microlens 1462 The surface shape is elliptic cylinder or hyperbolic cylinder. It should be noted that in this embodiment, the surface shapes of all the first strip-shaped microlenses 1442 of the first strip-shaped microlens array 144 are the same, and all the second strip-shaped microlenses of the second strip-shaped microlens array 146 The surface shape of the lens 1462 is the same.

In one example, the surface shape of the first strip-shaped microlens 1442 and the surface shape of the second strip-shaped microlens 1462 are both cylindrical surfaces. In this case, the cross-sectional radius of the first strip-shaped microlens 1442 or the second strip-shaped The cross-sectional radii of the microlenses 1462 are all greater than 0.05mm, and the spacing between different strip-shaped microlens structures ranges from 0.05mm to 0.5mm. In this way, the first strip-shaped microlens array 144 or the second strip-shaped microlens array 146 can achieve better optical refraction control under the above-mentioned dimensions, and then cooperate with each other to form a predetermined structured light pattern.

Please refer to FIG. 2. In some embodiments, the light source 12 is an edge-emitting laser, and the projection module 10 includes a prism 16. The prism 16 is disposed on the optical path of the light source 12 and is used to reflect the light emitted by the light source 12 to the microlens array element 14.

In this way, using an edge-emitting laser as the light source 12 is simple to manufacture and low in cost. Edge-emitting lasers are used to emit laser light, such as a distributed feedback laser (Distributed Feedback Laser, DFB).

Please refer to FIG. 1. In some embodiments, the light source 12 is a vertical cavity surface emitting laser (Vertical-Cavity Surface-Emitting Laser, VCSEL).

In this way, a vertical cavity surface emitting laser is used as the light source 12, and the projection distance of the laser is long. The vertical cavity surface emitting laser can emit infrared laser light, and the infrared light is non-visible light, and at the same time, it has the least amount in the spectrum, which can avoid the interference of ambient light.

In some embodiments, the material of the substrate 142 is a material that can transmit light emitted by the light source 12.

In this way, the light emitted by the light source 12 can project the structured light pattern through the microlens array. Specifically, the substrate 142 can be made of polyimide (PI), polyethylene terephthalate (Polyethylene Terephalate, PET), polyethylene naphthalate (PEN), etc. One of them.

In some embodiments, the projection module 10 includes a circuit board 18, and the light source 12 is disposed on the circuit board 18 and electrically connected to the circuit board 18.

In this way, the power supply can be connected to the light source 12 through the circuit board 18 to supply power to the light source 12, while the circuit board 18 can provide support for the light source 12. The circuit board 18 may be at least one of a flexible circuit board, a rigid circuit board, or a rigid-flex circuit board.

In some embodiments, the projection module 10 includes a lens barrel 11 that is disposed on the circuit board 18 and forms a receiving space with the circuit board 18. The connection modes of the lens barrel 11 and the circuit board 18 include screwing, gluing, and snapping. Both the light source 12 and the microlens array element 14 are accommodated in the accommodating space to protect the light source 12 and the microlens array element 14. In the example of FIG. 1, the inner side wall of the lens barrel 11 may be provided with a supporting step inward in a direction perpendicular to the optical path, and the microlens array element 14 is provided on the supporting step.

Referring to FIG. 5, the imaging device 100 of the embodiment of the present application includes the projection module 10 and the receiving module 20 of any of the above embodiments. The projection module 10 is used to project light to the target object, and the receiving module 20 is used to receive light reflected by the target object.

In the imaging device 100 of the embodiment of the present application, the light emitted by the light source 12 can be refracted twice by the microlens array element 14 to obtain a uniformly arranged light pattern with a dot-like distribution structure. Therefore, the microlens array element 14 can be used instead of the diffractive optical element. The manufacturing difficulty of the microlens array element 14 is relatively low and the technology is mature, which can realize mass production of the structured light imaging device 100 and at the same time can reduce the cost of the structured light imaging device 100.

Specifically, the imaging device 100 of the present application further includes a processor 30, which is connected to the projection module 10 and the receiving module 20. The processor 30 is used to process the light reflected by the target object to obtain the depth information of the target object. The imaging device 100 may also be formed with a projection window 40 corresponding to the projection module 10 and a collection window 50 corresponding to the receiving module 20. The projection module 10 can emit light to the target object through the projection window 40, and the receiving module 20 can receive the light reflected by the target object through the collection window 50.

In an example. The projection module 10 projects uniformly arranged dot-shaped structured light patterns to the target object, and the receiving module 20 collects the dot-shaped structured light patterns reflected by the target object. Then, the processor 30 compares the dot-shaped distribution structured light pattern with the reference pattern, and generates a depth image containing depth information according to the difference between the dot-shaped distribution structured light pattern and the reference pattern. Among them, the reference pattern is a plurality of point-like distributed structured light patterns that are collected in advance and projected on the collection model at different distances.

The imaging device 100 of the present application can be applied to fields such as face recognition and 3D modeling.

In some embodiments, the receiving module 20 includes a lens and an image sensor. The image sensor is located on the image side of the lens, and the lens is used to focus the light emitted by the projection module 10 reflected by the target object to the image sensor.

6 and 7, the electronic device 1000 according to the embodiment of the present application includes a housing 200 and the imaging device 100 in the above embodiment. The imaging device 100 is mounted on the housing 200.

In the electronic device 1000 according to the embodiment of the present application, the light emitted by the light source 12 can be refracted twice by the microlens array element 14 to obtain a uniformly arranged point-like structured light pattern. Therefore, the microlens array element 14 can be used instead of the diffractive optical element. The manufacturing difficulty of the microlens array element 14 is relatively low and the technology is mature. Mass production of the structured light imaging device 100 can be realized, and at the same time the cost of the structured light imaging device 100 can be reduced.

It can be understood that the imaging device 100 is provided on the housing 200 to acquire depth information of the target object. Specifically, the imaging device 100 may be disposed within the housing 200 and exposed from the housing 200, and the housing 200 may provide the imaging device 100 with protection against dust, water, or falling. The electronic device 1000 may be a surveillance camera, a mobile phone, a tablet computer, a laptop computer, a game machine, a head-mounted display device, an access control system, a teller machine, and the like. In the example of FIG. 6, the electronic device 1000 is a mobile phone. In the example of FIG. 7, the electronic device 1000 is a notebook computer.

In this application, unless otherwise clearly specified and defined, the first feature "above" or "below" the second feature may include the direct contact of the first and second features, or may include the first and second features Contact not directly but through another feature between them. Moreover, the first feature is “above”, “above” and “above” the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature is "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature level is less than the second feature.

The above disclosure provides many different implementations or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described above. Of course, they are only examples, and the purpose is not to limit this application. In addition, the present application may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

In the description of this specification, the descriptions referring to the terms "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" mean combined embodiments The specific features, structures, materials, or characteristics described in the examples are included in at least one embodiment or example of the present application. In this specification, the schematic expression of the above-mentioned terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present application have been shown and described, those of ordinary skill in the art may understand that various changes, modifications, replacements, and variations can be made to these embodiments without departing from the principle and purpose of the present application, The scope of the application is defined by the claims and their equivalents.

Claims

A projection module is characterized by comprising:

Light source; and

A microlens array element disposed on the optical path of the light source, the microlens array element includes a base material, the base material includes a first surface and a second surface opposite to each other, the first surface is provided with a first strip Micro-lens array, the second surface is provided with a second strip-shaped micro-lens array, the first strip-shaped micro-lens array includes a plurality of first strip-shaped micro-lenses, and the second strip-shaped micro-lens array includes a plurality of A second strip-shaped microlens, the arrangement direction of the plurality of first strip-shaped microlenses and the arrangement direction of the plurality of second strip-shaped microlenses intersect to form an angle.
The projection module according to claim 1, wherein the arrangement direction of the plurality of first strip-shaped microlenses is perpendicular to the arrangement direction of the plurality of second strip-shaped microlenses.
The projection module according to claim 1, wherein the surface shape of the first strip-shaped microlens includes a cylindrical surface, and the surface shape of the second strip-shaped microlens includes a cylindrical surface.
The projection module according to claim 3, wherein the cross-sectional profile of the first strip-shaped microlens is an arc, and the cross-sectional profile of the second strip-shaped microlens is an arc, and the arc Shapes include circular arcs, elliptical arcs, and hyperbolic arcs.
The projection module according to claim 4, wherein the surface shape of the first stripe microlens and the surface shape of the second stripe microlens are the same or different.
The projection module according to claim 1, wherein the light source is an edge emitting laser, the projection module includes a prism, the prism is disposed on the optical path of the light source and is used to reflect the light emitted by the light source The light reaches the microlens array element.
The projection module according to claim 1, wherein the light source is a vertical cavity surface emitting laser.
The projection module according to claim 1, wherein the projection module includes a circuit board, and the light source is disposed on the circuit board and electrically connected to the circuit board.
The projection module according to claim 8, wherein the projection module includes a lens barrel, the lens barrel is disposed on the circuit board and forms a receiving space with the circuit board, the light source and the The microlens array element is accommodated in the accommodation space.
An imaging device, characterized in that it includes:

A projection module, the projection module is used to project light to a target object; and

A receiving module, the receiving module is used to receive light reflected by the target object;

The projection module includes:

Light source; and

A microlens array element disposed on the optical path of the light source, the microlens array element includes a base material, the base material includes a first surface and a second surface opposite to each other, the first surface is provided with a first strip Micro-lens array, the second surface is provided with a second strip-shaped micro-lens array, the first strip-shaped micro-lens array includes a plurality of first strip-shaped micro-lenses, the second strip-shaped micro-lens array includes A second strip-shaped microlens, the arrangement direction of the plurality of first strip-shaped microlenses and the arrangement direction of the plurality of second strip-shaped microlenses intersect to form an angle.
The imaging device according to claim 10, wherein the arrangement direction of the plurality of first strip-shaped microlenses is perpendicular to the arrangement direction of the plurality of second strip-shaped microlenses.
The imaging device according to claim 10, wherein the surface shape of the first strip-shaped microlens includes a cylindrical surface, and the surface shape of the second strip-shaped microlens includes a cylindrical surface.
The imaging device according to claim 12, wherein the cross-sectional profile of the first strip-shaped microlens is an arc, and the cross-sectional profile of the second strip-shaped microlens is an arc, the arc Including circular arc, elliptical arc and hyperbolic arc.
The imaging device according to claim 13, wherein the surface shape of the first stripe microlens and the surface shape of the second stripe microlens are the same or different.
The imaging device according to claim 10, wherein the light source is an edge emitting laser, the projection module includes a prism, and the prism is disposed on an optical path of the light source and used to reflect light emitted by the light source To the microlens array element.
The imaging device according to claim 10, wherein the light source is a vertical cavity surface emitting laser.
The imaging device according to claim 10, wherein the projection module includes a circuit board, and the light source is disposed on the circuit board and electrically connected to the circuit board.
The imaging device according to claim 17, wherein the projection module includes a lens barrel, the lens barrel is disposed on the circuit board and forms a receiving space with the circuit board, the light source and the The microlens array element is accommodated in the accommodation space.
The imaging device according to claim 10, wherein the imaging device includes a processor, the processor is connected to the projection module and the receiving module, and the processor is used to process the target object Reflected light to obtain depth information of the target object.
An electronic device, characterized in that it includes:

Shell; and

The imaging device according to any one of claims 10 to 19, which is provided in the housing.