CN111812853A - Reflective element, optical collimation assembly, manufacturing method thereof, and structured light projection device - Google Patents

Abstract

The invention provides a reflecting element, an optical collimation assembly, a manufacturing method thereof and a structured light projection device, wherein the reflecting element comprises a reflecting main body and a molded body, wherein the reflecting main body is made of a solid light-transmitting medium, the reflecting element is provided with at least one reflecting surface, an incident surface and an emergent surface, and the molded body is molded and formed outside the reflecting surface so that light beams enter the reflecting element from the incident surface and are emitted from the emergent surface after being reflected by the reflecting surface at least once.

Description

Reflective element, optical collimation assembly, manufacturing method thereof, and structured light projection device

technical field

The present invention relates to a structured light projection device, and more specifically, to a reflective element, an optical collimation component, a manufacturing method thereof, and a structured light projection device, so as to reduce process requirements and improve yield.

Background technique

There are many technical solutions to achieve depth imaging. The mainstream solutions include binocular solution, TOF solution and structured light solution. The cost of the binocular solution is low, but the biggest problem is that the implementation of the algorithm requires high computing resources, resulting in poor real-time performance, and is basically linked to resolution and detection accuracy. That is to say, the higher the resolution and the higher the required precision, the more complicated the calculation will be. At the same time, the pure binocular scheme is affected by the illumination and the texture properties of the object.

The structured light scheme is proposed to solve the complexity and robustness of the binocular matching algorithm. The structured light method does not depend on the color and texture of the object itself, and adopts the method of actively projecting the known pattern to achieve fast and robust matching of feature points, which can achieve high accuracy and greatly expand the scope of application. With the gradual development and improvement of structured light technology, structured light depth cameras are becoming more and more popular in the market, especially its application in mobile terminals has attracted the attention of many mobile manufacturers. For example, the front camera module of Iphone X adopts speckle Structured light technology for face recognition unlocking.

The basic working process of the structured light depth camera is to project the structured light on the surface of the object to be measured and then the height of the object to be measured is modulated. The modulated structured light is collected by the camera system and sent to the computer for analysis and calculation. 3D surface data. The projection device used in the existing structured light depth camera includes a light emitter, a collimating mirror and an optical diffraction element, wherein the collimating mirror is arranged between the light emitter and the optical diffraction element. The light emitted by the light emitter is collimated by the collimating mirror, and then diffracted or replicated by the optical diffraction element, and then projected onto the surface of the space target.

However, as terminals continue to become thinner, the demand for video cameras is gradually developing towards miniaturization, and how to reduce the height and size of the camera has become an unavoidable problem. Due to the need to ensure the back focal length or focal length in the module design or work, it has become a difficult problem to reduce the height. In order to solve this problem, the size of the module is reduced by adding optical reflection elements to keep the optical path unchanged in many modules.

For example, an integrated light pipe is disclosed in the patent publication No. US20170075205A1 and titled "integrated light pipe for optical projection", through two relatively parallel light-transmitting substrates and Two relatively parallel reflective plates form a reflective space. The opposite surfaces of the two reflective plates are provided with reflective surfaces that are parallel to each other and can reflect light, and each reflective surface is inclined relative to the light-transmitting substrate. Each light-transmitting substrate is provided with opposite optical lenses on both sides of the preset area, respectively. The light enters from the two optical lenses on the incident side, is reflected by the opposite and parallel reflective surfaces, and exits from the two optical lenses on the exit side to achieve the purpose of being collimated.

In this solution, the two reflectors need to be parallel to ensure that the two opposite reflecting surfaces are parallel, so that the light after reflection and the light before reflection are parallel, and will not be scattered during the reflection process. However, to ensure that the two reflective plates and the two reflective surfaces are parallel is very demanding on the process. Once the reflective surfaces are not parallel, the sensitive light will be diverted. In this patent publication No. US20170075205A1, a solution of using spacer elements to space two reflectors is disclosed. However, even if the two surfaces of the spacer elements in contact with the two reflectors are parallel, errors may easily occur in the process of assembling the two reflectors with the spacer elements, resulting in the two reflectors being non-parallel. For example, the fixing glue between the spacer element and the reflector is not uniform, or the surface of the reflector in contact with the spacer element itself is uneven, and so on. That is to say, this solution has high requirements on the manufacturing process, which can easily lead to products that do not meet the conditions, and the product yield is low, which is not suitable for mass production. Especially for equipment with high optical precision requirements, this production scheme is not suitable.

In addition, because the center of this integrated light pipe is a cavity, the whole can only rely on the connection between the two light-transmitting substrates and the two reflecting plates to maintain the overall stability and the parallelism between the reflecting plates. Once hit or impacted, the connection between the light-transmitting substrate and the reflective plate is easily damaged, and the whole is easy to fall apart.

SUMMARY OF THE INVENTION

One object of the present invention is to provide a reflective element, an optical collimation assembly, a manufacturing method thereof, and a structured light projection device, wherein the optical collimation assembly utilizes the condition that the optical path of the reflective element remains unchanged, and the reduced size is small, especially It is small in height and size, which is suitable for the development of current miniaturization needs.

Another object of the present invention is to provide a reflective element, an optical collimation assembly, a manufacturing method thereof, and a structured light projection device, wherein the optical collimation assembly is a solid structure with high structural strength and is not easy to fall apart under impact force.

Another object of the present invention is to provide a reflective element, an optical collimation assembly, a manufacturing method thereof, and a structured light projection device, wherein the optical collimation assembly has high structural strength, especially the two opposite and parallel reflective surfaces will not be affected by The possibility of movement or deformation by impact is reduced, ensuring accuracy.

Another object of the present invention is to provide a reflective element, an optical collimation assembly, a manufacturing method thereof, and a structured light projection device, wherein the optical collimation assembly has a compact structure and is suitable for equipment requiring high optical precision.

Another object of the present invention is to provide a reflective element, an optical collimation component, a manufacturing method thereof, and a structured light projection device, wherein the manufacturing method of the optical collimation component has low requirements on the manufacturing process and high yield.

Another object of the present invention is to provide a reflective element, an optical collimation assembly, a manufacturing method thereof, and a structured light projection device, wherein the manufacturing method of the optical collimation assembly utilizes the first surface and the second surface of a light-transmitting medium A reflective surface is formed, and the first surface and the second surface can be parallelized by mature existing processes such as grinding, and the requirements for the manufacturing process are low.

Another object of the present invention is to provide a reflective element, an optical collimation assembly, a manufacturing method thereof, and a structured light projection device, wherein the manufacturing method of the optical collimation assembly utilizes the first surface and the second surface of a light-transmitting medium A reflective surface is formed, and the first surface and the second surface can be parallelized by mature existing processes such as grinding to ensure accuracy, thereby improving product yield.

Another object of the present invention is to provide a reflective element, an optical collimation assembly, a method for manufacturing the same, and a structured light projection device, wherein an optical lens can be directly mounted on the predetermined area of the incident surface and the exit surface of the optical collimation assembly , or install it by using the paneling process to achieve the purpose of alignment. That is, those skilled in the art can select an appropriate installation process according to the actual situation, so as to facilitate production.

Another object of the present invention is to provide a reflective element, an optical collimation assembly, a manufacturing method thereof, and a structured light projection device, wherein the reflective surface of the optical collimation assembly is implemented as a free-form surface, and the free-form surface pairs The beam is directly collimated.

Another object of the present invention is to provide a reflective element, an optical collimation assembly, a manufacturing method thereof, and a structured light projection device, wherein the optical diffraction element of the structured light projection device has a collimation function, and the light beam is collimated by the optical beam After the assembly is collimated, it can be further collimated through the optical diffractive element, so as to improve the collimation effect.

Another object of the present invention is to provide a reflective element, an optical collimation assembly, a manufacturing method thereof, and a structured light projection device, wherein the optical diffraction element of the structured light projection device has a collimation function, which can also reduce the impact on the optical The requirements of the optical lens surface shape and curvature of the collimating component, thereby reducing the processing difficulty.

Another object of the present invention is to provide a reflective element, an optical collimation assembly, a manufacturing method thereof, and a structured light projection device, wherein a detection circuit is arranged on the surface of the optical diffraction element, so as to detect the conduction of the detection circuit , to ensure that the structure of the optical diffraction element is complete, and to avoid damage to the human eye caused by the projection capability of the optical diffraction element.

Another object of the present invention is to provide a reflective element, an optical collimation assembly, a manufacturing method thereof, and a structured light projection device, wherein the reflective element adopts a molding process to form a sidewall, so as to facilitate the LDS process (Laser Direct Structuring, Laser Direct Structuring). ) makes the detection circuit and the circuit board conduct, without requiring an external circuit structure, reducing the difficulty of the process and reducing the overall volume of the projection module.

In order to achieve at least one of the above objects of the present invention, according to one aspect of the present invention, the present invention further provides a reflective element, comprising:

A reflective body and a molded body, wherein the reflective body is made of a solid light-transmitting medium, the reflective body has at least a reflective surface, an incident surface and an exit surface, wherein the molded body is molded and formed on Outside the reflective surface, the light beam enters the reflective element from the incident surface, is reflected at least once by the reflective surface, and then exits from the emitting surface.

According to an embodiment of the present invention, the reflective surface is formed by covering the surface of the light-transmitting medium with a reflective material.

According to an embodiment of the present invention, the reflective element has two reflective surfaces, wherein the two reflective surfaces are opposite and parallel, and are inclined with respect to the incident surface and the outgoing surface, so that the light beam can be transmitted from the incident surface from the incident surface. The surface enters the reflecting element, is reflected by the reflecting surface at least twice, and then exits the exit surface, so that the incident light beam and the outgoing light beam are parallel.

According to an embodiment of the present invention, the incident surface and the exit surface are opposite and parallel, and the cross section of the reflection element is a parallelogram.

According to an embodiment of the invention, the two reflecting surfaces are implemented as flat surfaces.

According to an embodiment of the invention, the two reflecting surfaces are implemented as free-form surfaces.

According to an embodiment of the present invention, the turning angle of the free-form surface is 50° to 75°.

According to an embodiment of the present invention, the turning angle of the light beam on the free-form surface is 60° to 150°.

According to an embodiment of the present invention, the turning angle of the light beam on the free-form surface is 90° to 120°.

According to another aspect of the present invention, the present invention further provides an optical collimation assembly for use in a structured light projection device, comprising:

Any of the reflective elements as described above; and

At least one optical lens, wherein the optical lens is installed on the incident surface or \ and the exit preset area to achieve collimation.

According to an embodiment of the present invention, the optical collimation assembly further includes at least one optically transparent substrate, wherein the optically transparent substrate is made of a transparent material, wherein the optically transparent substrate is attached to the incident light surface or \ and the surface of the exit surface, wherein the optical lens is attached to the surface of the transparent sub-substrate, corresponding to the predetermined area of the incident surface or \ and the exit surface.

According to another aspect of the present invention, the present invention further provides a structured light projection device, comprising:

a projection unit for emitting light beams;

Any of the optical collimation assemblies as described above, wherein the optical collimation assembly collimates the light beam emitted by the projection unit; and

An optical diffractive element, wherein the light beam emitted by the projection unit is collimated by the optical collimation component, and then diffracted or replicated by the optical diffractive element, and then projected onto the surface of the space target.

According to an embodiment of the present invention, the optical diffractive element includes a collimating part and a diffractive part, wherein the diffractive part is disposed on the light beam exit side of the collimating part, so that the optical collimating component passes through the optical collimating component. The collimated light beam is further collimated by the collimating part, and then reaches the space target through the diffractive part.

According to an embodiment of the present invention, the structured light projection device further includes a circuit board and a detection circuit, wherein the projection unit is disposed on the circuit board and is connected to the circuit board, wherein the detection circuit It is arranged on the surface of the optical diffractive element and is connected to the circuit board to detect whether the optical diffractive element is complete.

According to an embodiment of the present invention, the detection circuit is implemented as ITO, which is coated on the surface of the optical diffractive element.

According to an embodiment of the present invention, the structured light projection device further includes a conducting circuit, wherein the conducting circuit conducts the detection circuit and the circuit board, wherein the conducting circuit is formed by adopting an LDS process on the surface of the molded body.

According to an embodiment of the present invention, the structured light projection device further includes a conducting circuit, wherein the conducting circuit conducts the detection circuit and the circuit board, wherein the conducting circuit is connected by the molded body pack.

According to another aspect of the present invention, the present invention further provides a method for manufacturing an optical collimation assembly for a structured light projection device, comprising:

(a) Opposite and parallel first and second surfaces of a solid light-transmitting medium form a light-transmitting medium.

a reflective surface and a second reflective surface of a light-transmitting medium;

(b) forming a package having the first reflective surface of the light-transmitting medium and the second reflective surface of the light-transmitting medium

The molding layer of the light-transmitting medium, wherein the molding layer is made of an opaque material;

(c) cutting the light-transmitting medium with the molding layer at preset intervals to form a plurality of light-transmitting single strips; and

(d) arranging the light-transmitting single strips in a preset direction, and cutting the arranged light-transmitting single strips according to a preset cutting line to form a plurality of reflective elements having an incident surface and an exit surface, wherein the extension of the light-transmitting single strip The direction and the extending direction of the cutting line form a preset angle, so that the light beam enters the reflecting element from the incident surface, and exits from the exit surface after being reflected by the reflecting element at least once.

According to an embodiment of the present invention, the step (a) forms the first reflection surface of the light-transmitting medium and the second surface of the light-transmitting medium by covering the first surface and the second surface with a material with reflective properties. Two reflective surfaces.

According to an embodiment of the present invention, before the step (d), the method for manufacturing an optical collimation component further includes:

(e) Treating the cut surface of the light-transmitting single strip to form a stray light preventing surface to prevent stray light from entering.

According to an embodiment of the present invention, in the step (e), the stray light preventing surface is formed by roughening the cut surface.

According to an embodiment of the present invention, in the step (e), the surface of the cut surface is covered with a light-shielding material, that is, the stray light prevention surface is formed.

According to an embodiment of the present invention, in the step (d), the light-transmitting single strip extends in a horizontal direction, the preset cutting direction and the extending direction of the light-transmitting single strip are at a preset angle, and the light-transmitting single strip is cut obliquely. Translucent single strip.

According to an embodiment of the present invention, in the step (d), the light-transmitting single strip is placed obliquely, and the preset cutting direction extends along the horizontal direction.

According to an embodiment of the present invention, the step (d) further comprises the steps of:

(d.1) Arranging the light-transmitting single strips on the substrate in a predetermined direction; and

(d.2) The light-transmitting single strip and the substrate are cut according to a preset cutting line to form a plurality of reflective element strips, wherein the extending direction of the light-transmitting single strip and the extending direction of the cutting line are at a predetermined angle, wherein The reflective element strip includes a substrate strip and a plurality of the reflective elements having the incident surface and the outgoing surface arranged on the substrate strip.

According to an embodiment of the present invention, the method for manufacturing an optical collimation assembly further includes:

(e) One by one, optical lenses are installed on the predetermined area of the incident surface or the output surface.

According to an embodiment of the present invention, the method for manufacturing an optical collimation assembly further includes:

(f) Arranging the reflective element strips according to the spacing between adjacent rows of optical lenses of an optical lens imposition, wherein the arrangement of the optical lenses in the optical lens imposition is the same as the reflective elements in the reflective element strips The arrangement corresponds to;

(g) attaching the light-transmitting substrate of the optical lens imposition to the incident surface or the exit surface of the reflective element of the reflective element strip, wherein the optical lens corresponds to a predetermined area of the incident surface or the exit surface .

According to an embodiment of the present invention, the method for manufacturing an optical collimation assembly further includes:

(h) removing the substrate strip of the reflective element strip.

According to an embodiment of the present invention, the method for manufacturing an optical collimation assembly further includes:

(i) Dividing the already assembled optical lens imposition and the strip of reflective elements to form a plurality of the optical collimation assemblies.

According to an embodiment of the present invention, in the step (d), the light-transmitting single strip is cut twice, and the two preset cutting directions are perpendicular to form the incident surface and the exit surface of the reflective element. The surface is vertical, so that the light beam enters the reflection element from the incident surface, is reflected once by the reflection element, and then exits from the exit surface.

According to an embodiment of the present invention, the first surface and the second surface in the step (a) are opposite and parallel free-form surfaces, wherein the incident surface formed by cutting the step (d) and the outgoing surface are corresponding free-form surfaces, wherein the inflection angle of the free-form surfaces of the incident surface and the outgoing surface is 50° to 75°.

According to an embodiment of the present invention, in the step (d.1), the light-transmitting single strip is arranged on the substrate in a manner that its cut surface is attached to the substrate.

Description of drawings

1 is a perspective view of a light-transmitting medium of a method of manufacturing an optical collimation assembly according to an embodiment of the present invention.

2A is a process diagram of forming a first reflective surface of a light-transmitting medium and a second reflective surface of the light-transmitting medium of a light-transmitting medium according to an embodiment of the present invention.

FIG. 2B is another process diagram of forming a first reflection surface of a transparent medium and a second reflection surface of a transparent medium of a transparent medium in a method for manufacturing an optical collimation assembly according to an embodiment of the present invention.

FIG. 2C is a perspective view of a first reflective surface and a second reflective surface of the light-transmitting medium formed by a light-transmitting medium in a method for manufacturing an optical collimation assembly according to an embodiment of the present invention.

2D is a cross-sectional view of the light-transmitting medium after the first reflective surface of another light-transmitting medium and the second reflective surface of the light-transmitting medium are formed in a method for manufacturing an optical collimation assembly according to an embodiment of the present invention.

3A is a cross-sectional view of a method for manufacturing an optical collimation assembly after molding a light-transmitting medium according to an embodiment of the present invention.

3B is a perspective view of a method for manufacturing an optical collimation assembly after molding of a light-transmitting medium according to an embodiment of the present invention.

FIG. 4 is a schematic diagram of cutting of a light-transmitting medium after molding of a method for manufacturing an optical collimation assembly according to an embodiment of the present invention.

5 is a schematic diagram of a cut surface of a light-transmitting single strip after anti-stray light treatment of a method for manufacturing an optical collimation assembly according to an embodiment of the present invention.

6A and 6B are schematic diagrams of arrangement and cutting of light-transmitting single strips in a method for manufacturing an optical collimation assembly according to an embodiment of the present invention.

6C is a perspective view of a reflective element obtained by a method for manufacturing an optical collimation assembly according to an embodiment of the present invention.

6D is a cross-sectional view of the above-mentioned reflective element obtained by a method for manufacturing an optical collimation assembly according to an embodiment of the present invention.

FIG. 7 is a light-transmitting element installation method of a method for manufacturing an optical collimation assembly according to an embodiment of the present invention.

8 is a flowchart of a method of manufacturing an optical collimation assembly according to an embodiment of the present invention.

FIG. 9 is a schematic diagram of the arrangement and cutting manner of light-transmitting single strips in a method for manufacturing an optical collimation component according to an embodiment of the present invention.

FIG. 10 is a cross-sectional view after rotation of the reflective element strip cut according to the method shown in FIG. 9 .

11A is a top view of an optical lens imposition of a method for manufacturing an optical collimation assembly according to an embodiment of the present invention.

11B is a side view of an optical lens imposition of a method of manufacturing an optical collimation assembly according to an embodiment of the present invention.

12 is an assembly diagram of an optical lens imposition and a light-transmitting single strip of a method for manufacturing an optical collimation assembly according to an embodiment of the present invention.

FIG. 13 is a cross-sectional view of the reflective element obtained by cutting after assembly according to FIG. 12 .

FIG. 14A is a schematic diagram of another arrangement and cutting manner of light-transmitting single strips of a method for manufacturing an optical collimation component according to an embodiment of the present invention.

14B is a perspective view of another reflective element obtained by a method for manufacturing an optical collimation assembly according to an embodiment of the present invention.

FIG. 15 is another installation flow chart of the light-transmitting element of the manufacturing method of the optical collimation assembly according to an embodiment of the present invention.

16 is a cross-sectional view of an optical collimation assembly according to one embodiment of the present invention.

17 is a cross-sectional view of an optical collimation assembly according to another embodiment of the present invention.

18A is a cross-sectional view of an optical collimation assembly according to another embodiment of the present invention.

18B is a cross-sectional view of an optical collimation assembly according to another embodiment of the present invention.

19 is a cross-sectional view of an optical collimation assembly according to another embodiment of the present invention.

20 is a cross-sectional view of an optical collimation assembly according to another embodiment of the present invention.

21 is a schematic diagram of a reflective element cutting molded body of an optical collimation assembly according to an embodiment of the present invention.

22 is a cross-sectional view of an optical collimation assembly according to one embodiment of the present invention.

FIG. 23 is a schematic diagram of a structured light projection device according to an embodiment of the present invention.

24 is a schematic diagram of a structured light projection device according to another embodiment of the present invention.

FIG. 25 is a schematic diagram of a structured light projection device according to another embodiment of the present invention.

26 is a schematic diagram of a structured light projection device according to another embodiment of the present invention.

FIG. 27 is a schematic diagram of a structured light projection device according to another embodiment of the present invention.

28 is a schematic top view of a structured light projection device according to another embodiment of the present invention.

Detailed ways

The following description serves to disclose the invention to enable those skilled in the art to practice the invention. The preferred embodiments described below are given by way of example only, and other obvious modifications will occur to those skilled in the art. The basic principles of the invention defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other technical solutions without departing from the spirit and scope of the invention.

It should be understood by those skilled in the art that in the disclosure of the present invention, the terms "portrait", "horizontal", "upper", "lower", "front", "rear", "left", "right", " The orientation or positional relationship indicated by vertical, horizontal, top, bottom, inner, outer, etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and to simplify the description, rather than to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus the above terms should not be construed as limiting the invention.

It should be understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be one. The number may be plural, and the term "one" should not be understood as a limitation on the number.

As shown in FIG. 1 to FIG. 15 , an optical collimation assembly for a structured light projection device and a manufacturing method thereof of the present invention are described. The optical collimation assembly 10 utilizes the fact that the optical path of the reflective element remains unchanged, and the reduced size is small, especially the height size is small, which is suitable for the development of the current miniaturization demand. At the same time, the optical collimation assembly is a solid structure with high structural strength, and is not easily broken apart by impact force and is not easily displaced or deformed. The method for manufacturing the optical collimation assembly is used to manufacture the optical collimation assembly 10 , and has low requirements on the manufacturing process and high product yield.

As shown in FIG. 8 , it is a flow chart of the manufacturing method of the optical collimation assembly of the present invention.

Step 101: Provide a light-transmitting medium 100, wherein the first surface 110 and the second surface 120 of the light-transmitting medium 100 are opposite and parallel.

As shown in FIG. 1 , the light-transmitting medium 100 may be a solid transparent medium such as transparent glass, which is not limited in the present invention. The distance D between the first surface and the second surface is not limited, and can be designed by those skilled in the art as required. The technology for forming light-transmitting media with relatively parallel planes is currently very mature. Taking glass as an example, it can be formed by a grinding process, or by using a mold in the manufacturing process, and so on, which will not be repeated here. Preferably, the light-transmitting medium 100 has a refractive index greater than 1.

Step 102 : forming a first reflective surface 130 of a light-transmitting medium and a second reflective surface 140 of a light-transmitting medium on the first surface 110 and the second surface 120 , respectively.

As shown in FIGS. 2A to 2D , the first reflective surface 130 of the light-transmitting medium and the second reflective surface 140 of the light-transmitting medium may be formed on the first surface 110 and the first surface 110 and the second reflective surface 140 by sputtering or vapor deposition. The surfaces of the two surfaces 120 are formed by covering the material with reflective properties. The first reflective surface 130 of the light-transmitting medium and the second reflective surface 140 of the light-transmitting medium are surfaces where the light-reflecting material is in contact with the light-transmitting medium 100 .

Because the first surface 110 and the second surface 120 are opposite and parallel, the first reflecting surface 130 of the light-transmitting medium and the second reflecting surface 140 of the light-transmitting medium are also opposite and parallel. At this time, the first reflective surface 130 of the light-transmitting medium and the second reflective surface 140 of the light-transmitting medium are formed by adhering to the light-transmitting medium 100 , which reduces the requirements on the manufacturing process and does not require an additional substrate to ensure the space between the reflective surfaces. parallel, and avoid extra assembly steps leading to errors.

Specifically, during the implementation of the step 102 , the first surface 110 and the second surface 120 may be coated successively (as shown in FIG. 2A ), or the first surface 110 may be coated simultaneously. and the second surface 120 is coated with a film (as shown in FIG. 2B ), which is not limited by the present invention. Alternatively, each surface of the light-transmitting medium 100 may be coated with a film (as shown in FIG. 2D ).

Step 103 : forming a molding layer 200 wrapping the light-transmitting medium 100 having the first reflective surface 130 of the light-transmitting medium and the second reflective surface 140 of the light-transmitting medium.

The molding layer 200 is formed on the surface of the light-transmitting medium 100 by a process such as molding, molding, or injection molding. The molding layer 200 is made of an opaque material, so as to prevent the reflective element 11 of the optical collimation assembly 10 formed later from being able to shield unnecessary stray light, as shown in FIG. 3A and FIG. 3B .

Step 104 : cutting the light-transmitting medium 100 with the molding layer 200 at preset intervals to form a plurality of light-transmitting single strips 150 .

As shown in FIG. 4 , it is the implementation process of step 104 . It can be known that, since the light-transmitting medium 100 has the opposite and parallel first reflection surface 130 of the light-transmitting medium and the second reflection surface 140 of the light-transmitting medium, after cutting, the obtained light-transmitting single strip 150 should also have a single transparent first reflection surface 152 and a single transparent second reflection surface 152 formed by cutting the first reflection surface 130 of the transparent medium and the second reflection surface 140 of the transparent medium at the corresponding position. Reflecting surface 153 . The light-transmitting single first reflecting surface 152 and the light-transmitting single second reflecting surface 153 are opposite and parallel.

The preset cutting spacing is set according to the final product requirements of the optical collimation assembly 10 . After cutting, the light-transmitting unit 150 has at least one cutting surface 151 that is not covered by the molding material. For example, the light-transmitting cells 150 located at both ends have one cutting surface 151 , and the other light-transmitting cells 150 have two cutting surfaces 151 . The cutting surface 151 is also formed along the cutting route of step 104 .

Step 105: Process the cut surface 151 of the light-transmitting single strip 150 to prevent stray light from entering.

There are many methods for processing the cut surface 151 of the light-transmitting single strip 150, for example, roughening the cut surface 151 to make the cut surface 151 have a certain roughness, so as to prevent stray light from entering; or, for example, in the The surface of the cutting surface 151 is covered with a light-shielding material, that is, a light-shielding surface is formed, so as to achieve the purpose of preventing stray light from entering, etc., which is not limited in the present invention, as shown in FIG. 5 .

Step 106: Arrange the light-transmitting single strips 150 in a preset direction, and cut the arranged light-transmitting single strips 150 according to a preset cutting line to form a plurality of reflective elements 11 having an incident surface 111 and an exit surface 112, wherein the The extending direction of the light-transmitting single strip 150 and the extending direction of the cutting line form a preset angle, wherein the light beam enters the reflecting element 112 from the incident surface 111 , and after being reflected by the reflecting element 11 at least once, exits the exit surface 112 shoot.

The preset included angle is related to the required beam path, as shown in FIG. 22 . That is to say, the optical path requirements are realized according to the reflection, for example, in the projection module to ensure that the focal point of the optical lens is located on the surface of the projection unit, or in the receiving module to ensure that the optical path meets the requirements of the back focal length or total focal length of the module, the preset clip The angles are correspondingly different. The incident surface 111 and the outgoing surface 112 are two surfaces that are exposed and formed when the corresponding reflection element 11 is formed by cutting. That is to say, the incident surface 111 and the exit surface 112 are formed along the cutting path of the light-transmitting single strip 150 . It is worth mentioning that the distance between the preset cutting lines determines the size of the reflective element 11, especially the height dimension during installation and use, and those skilled in the art can design the distance between the cutting lines according to the size requirements.

In one embodiment of the present invention, as shown in FIG. 6A , the light-transmitting single strip 150 is placed in a horizontal direction, that is, the light-transmitting single strip 150 extends in the horizontal direction, and the preset cutting direction is the same as the The extending direction of the light-transmitting single strip 150 is at a predetermined angle, and the light-transmitting single strip 150 is cut obliquely. In another embodiment of the present invention, as shown in FIG. 6B , the light-transmitting single strip 150 is placed obliquely, that is, the extending direction of the light-transmitting single strip 150 forms an included angle with the horizontal direction, and the preset cutting direction Extends in the horizontal direction to achieve the cutting effect.

As shown in FIG. 6C and FIG. 6D , the reflection element 11 obtained by cutting through the aforementioned method, the cross section of the reflection element 11 is a parallelogram. Since the light-transmitting single strip 150 has the light-transmitting single-stripe first reflective surface 152 and the light-transmitting single-stripe second reflecting surface 153 that are opposite and parallel, the reflective element 11 obtained by cutting should also be in the corresponding position A first reflection surface 113 and a second reflection surface 114 are formed by cutting, and the first reflection surface 113 and the second reflection surface 114 are opposite and parallel. The incident surface 111 and the outgoing surface 112 of the reflection element 11 formed along the cutting line are parallel to each other. That is, the first reflection surface 113 and the second reflection surface 114 are inclined with respect to the incident surface 111 and the output surface 112 .

After the reflective element 11 is formed, two optical lenses 12 can be installed one by one on the predetermined area of the incident surface 111 and the exit surface 112 to form the optical collimation assembly 10 , as shown in FIG. 7 . . That is to say, one of the optical lenses 12 is directly attached to a predetermined area of the incident surface 111 , and the other optical lens 12 is directly disposed in a predetermined area of the exit surface 112 . The light beam enters the reflecting element 11 from the optical lens 12 of the incident surface 111 , is reflected at least twice by the first reflecting surface 113 and the second reflecting surface 114 that are parallel to each other, and exits the exit surface 112 The optical lens 12 is emitted, and the incident light beam and the outgoing light beam are parallel.

In another embodiment of the present invention, the optical lens 12 is arranged on the surface of the reflection element 11 through a paneling process. FIG. 15 is a flow chart of assembling an optical lens and a reflective element according to an embodiment of the present invention. Specifically, after the step 105, the following steps may be performed to realize the assembly of the optical lens and the reflective element.

Step 201 : Arrange the light-transmitting single strips 150 on the substrate 300 in a predetermined direction.

The substrate 300 may be a material suitable for post-cutting such as glass or ceramics, as shown in FIG. 9 .

In an embodiment of the present invention, the step 210 can simultaneously achieve the purpose of the step 105, that is, the stray light prevention processing step. Specifically, the light-transmitting single strips 150 are arranged on the substrate 300 in a manner that the cutting surface 151 is attached to the substrate 300 . The substrate 300 may be made of an opaque material. Further, for the light-transmitting single strips 150 of the two cutting surfaces 151 , two opposite substrates 300 may be used, that is, the light-transmitting single strips 150 are attached to each of the cutting surfaces 151 correspondingly. The substrates 300 are arranged between two opposite substrates 300 .

Step 202: The transparent single strip 150 and the substrate 300 are cut according to a preset cutting line to form a plurality of reflective element strips 160, wherein the extending direction of the transparent single strip 150 and the extending direction of the cutting line are at a preset angle , wherein the reflective element strip 160 includes a substrate strip 310 and a plurality of reflective elements 11 with an incident surface 111 and an exit surface 112 arranged on the substrate strip 310 .

As mentioned above, the arrangement direction of the light-transmitting single strips 150 can be horizontal or inclined, and the corresponding cutting line direction can be changed accordingly. The transparent single strip 150 is cut to form a plurality of the reflective elements 11 . Since the light-transmitting single strip 150 is attached to the substrate 300 , the substrate 300 is correspondingly cut, and the reflective element 11 is correspondingly attached to the substrate strip 310 formed after the substrate 300 is cut, as shown in FIG. 10 . . FIG. 10 is obtained by rotating the reflective element strip 160 obtained by cutting in FIG. 9 by 90 degrees.

Step 203 : Provide at least one optical lens imposition 400 .

As shown in FIG. 11A and FIG. 11B , a plurality of the optical lenses 12 are arranged on a transparent substrate 410 in an array to form the optical lens imposition 400 . The arrangement of the optical lenses 12 in the optical lens imposition 100 corresponds to the arrangement of the reflective elements 11 in the reflective element strip 160, for example, the spacing between the adjacent optical lenses 12 in the same row and the adjacent reflections The elements 11 are equally spaced. The optical lens imposition 400 may be in a strip shape corresponding to the size of the reflection element strips 160 , or may be in a plate shape capable of covering a plurality of reflection element strips 160 .

Step 204 : Arrange the reflective element strips 160 according to the spacing between adjacent rows of the optical lenses 12 of the optical lens imposition 400 , wherein the incident surface 111 or the exit surface 112 of the reflective element 11 faces outward.

In order to facilitate the subsequent assembly of the optical lens imposition 400 and the reflective element strips 160, the arrangement of the reflective element strips 160 should correspond to the arrangement of the optical lenses 12 of the optical lens imposition 400, so as to ensure the subsequent assembly process. , the optical lens 12 can be installed in a predetermined area of the incident surface 111 or the exit surface 112 .

Step 205 : the light-transmitting substrate 410 of the optical lens imposition 400 is attached to the incident surface 111 or the exit surface 112 of the reflective element 11 of the reflective element strip 160 , wherein the optical lens 12 corresponds to the incident surface 111 or \ and the preset area of the exit surface 112.

That is to say, the optical lens 12 is disposed on the transparent substrate 410 , and the transparent substrate 410 is attached to the incident surface 111 or the output surface 112 of the reflecting element 11 . Different from the solution in which the optical lens 12 is directly attached to the incident surface 111 or the exit surface 112, this imposition process utilizes a light-transmitting substrate to realize the installation of the optical lens 12, which can improve the assembly efficiency, as shown in FIG. 12 . shown.

Optional step 206 : removing the substrate strips 310 of the reflective element strips 160 .

The step 206 is an optional step, and when the substrate strip 310 is used as a stray light preventing processing element, the substrate strip 310 does not need to be removed. However, in the embodiment in which steps such as roughening have been used to prevent stray light, the step 206 may be performed, thereby reducing the volume.

Step 207 : dividing the assembled optical lens imposition 400 and the reflective element strip 160 to form a plurality of the optical collimation assemblies 10 .

The order of the step 206 and the step 207 is not limited. Step 206 may be performed first and then step 207 may be performed, that is, the substrate strip 310 of the reflective element strip 160 may be removed first, and then only the transparent substrate 410 of the optical lens imposition 400 needs to be cut during the cutting process. Alternatively, step 207 may be performed first and then step 206 may be performed, that is, cutting is performed first, and the light-transmitting substrate 410 of the optical lens imposition 400 and the substrate strip 310 of the reflective element strip 160 may be cut during the cutting process, and then each strip may be removed one by one. a substrate strip of the optical collimation assembly 10 .

The optical collimation assembly 10 obtained by assembling and cutting according to the above imposition process is shown in FIG. 13 and FIG. 17 . The cross section of the reflecting element 11 is still a parallelogram. The light-transmitting substrate 410 is cut to form a plurality of sub-substrates 13 , and the sub-substrates 13 are attached to the incident surface 111 or the outgoing surface 112 of the corresponding reflection element 11 . Specifically, one of the optically transparent substrates 13 is attached to the surface of the incident surface 111 of the reflective element 11 , and one of the optical lenses 12 is attached to the surface of the optically transparent substrate 13 , which corresponds to the predetermined surface of the incident surface 111 . set area. The other optically transparent substrate 13 is attached to the surface of the exit surface 112 of the reflective element 11 , and the other optical lens 12 is attached to the surface of the other optically transparent substrate 13 , corresponding to the surface of the exit surface 112 . Preset area.

The light beam enters the reflective element 11 from the optical lens 12 on the incident surface 111 side, through the transparent sub-substrate 13 on the incident surface 111 side, and passes through the first reflective surfaces 113 parallel to each other. and the second reflective surface 114 reflect at least twice, and then exit from the optical lens 12 of the exit surface 112 through the optically transparent substrate 13 on the exit surface 112 side, and the incident beam and the exit beam parallel.

In another embodiment of the present invention, in the step 106, the light-transmitting single strip 150 is cut twice, and the two cutting directions are perpendicular, as shown in FIG. 14A . For example, the light-transmitting single strip 150 is placed in a horizontal direction, that is, the light-transmitting single strip 150 extends in a horizontal direction. The two preset cutting directions and the extending direction of the light-transmitting single strip 150 form a predetermined included angle, and the light-transmitting single strip 150 is cut obliquely, and the two preset cutting directions are perpendicular to each other.

The reflective element 11A obtained by the aforementioned method is shown in FIG. 14B , and the cross-section of the reflective element 11A is square. After being cut perpendicularly to each other twice, the reflective element 11A has a first reflective surface 113A, and the first reflective surface 113A extends along the diagonal of the reflective element 11A. Further, the incident surface 111A and the exit surface 112A formed along the cutting direction are perpendicular to each other, and the first reflection surface 113A faces the incident surface 111A and the exit surface 112A. The light beam enters the reflecting element 11A from the incident surface 111A, is reflected once by the first reflecting surface 113A parallel to each other, that is, exits from the exit surface 112A, and the incident light beam and the outgoing light beam are perpendicular. The reflective element 11A can be used in a periscope module.

Different cutting methods determine the final shape of the reflective element 11 , and those skilled in the art can design cutting schemes according to requirements. But it can be known that no matter how it is cut, since the surface with the reflective function is attached to the entity such as a transparent medium, and no additional assembly steps are required, it not only has high structural strength, but also has low process requirements. Taking the manufacturing solution proposed in the background art as an example, in the prior art, a substrate is provided first, a reflective structure (reflective substrate) is formed on the surface of the substrate, and the two reflective structures are arranged face to face, separated by a spacer, to form a reflective structure. cavity, and then remove the substrate. The reflective substrates are arranged face to face, the distance D between the reflective substrates should be determined by the spacers, and the spacers should be kept parallel, so it must be ensured that the heights of all the spacers are the same , and the surface is flat; further, when the spacers are placed between the reflective substrates, the distance between the spacers needs to be set according to a predetermined position. Once the predetermined position is shifted, the optical element cannot be Normal use.

In the present invention, a reflective film is applied on a light-transmitting medium and then molded. For example, when the light-transmitting medium is implemented as glass, the first surface and the second surface of the glass can be kept parallel by grinding technology. , that is, to keep the flatness high, thereby reducing the difficulty of the process. Part of the peripheral wall of the reflective element is formed by a molding process and roughening process, which not only has a mature process, but also has low process requirements and is not easy to cause errors. The prior art solution is prone to errors, such as parallelism error between substrates and distance error between spacers, while the glass formation of the present invention can ensure flatness, and only needs to pay attention to the distance accuracy during cutting.

It is worth mentioning that, in order to facilitate the optical element, the shape of the optical element can be improved, for example, cutting the molded body formed by molding to make the optical collimation assembly form a cubic structure, as shown in FIG. 21 . .

According to another aspect of the present invention, the present invention further provides an optical collimation assembly for a structured light projection device. The optical collimation assembly can be produced by the above-mentioned manufacturing method of the optical collimation assembly, so as to achieve the objects and advantages of the present invention.

As shown in FIG. 16 , the optical collimation assembly 10 includes the reflective element 11 and at least one of the optical lenses 12 . The reflecting element 11 includes a reflecting body 115 and a molding body 116 . The reflecting body 115 is made of a solid light-transmitting medium. The reflecting body 115 has two reflecting surfaces, namely the first reflecting surface 113 and the second reflecting surface 114 , and the first reflecting surface 113 and the second reflecting surface 114 are opposite and parallel. The first reflective surface 113 and the second reflective surface 114 may be formed by covering the surface of the light-transmitting medium with a reflective material. The reflection body 115 further has the incident surface 111 and the outgoing surface 112 , and the incident surface 111 and the outgoing surface 112 are opposite to each other. Preferably, the incident surface 111 and the exit surface 112 are opposite and parallel. The molded body 116 covers the first reflecting surface 113 and the second reflecting surface 114 , and the molded body 116 surrounds the peripheral sides of the incident surface 111 and the exit surface 112 .

Further, the reflecting body 115 has a six-sided three-dimensional structure, two of which are the first reflecting surface 113 and the second reflecting surface 114 , the two surfaces are the incident surface 111 and the exiting surface 112 , and the remaining two surfaces are the first reflecting surface 113 and the second reflecting surface 114 In order to prevent the stray light surface, it can be realized by roughening the surface, coating light-shielding material or attaching a light-shielding plate.

In an embodiment of the present invention, the optical lens 12 is attached to a predetermined area of the incident surface 111 or the exit surface 112 . Preferably, one of the optical lenses 12 is directly attached to a predetermined area of the incident surface 111 , and the other optical lens 12 is directly disposed in a predetermined area of the exit surface 112 . The light beam enters the reflecting element 11 from the optical lens 12 of the incident surface 111 , is reflected at least twice by the first reflecting surface 113 and the second reflecting surface 114 that are parallel to each other, and exits the exit surface 112 The optical lens 12 is emitted, and the incident light beam and the outgoing light beam are parallel.

Alternatively, in another embodiment of the present invention, as shown in FIG. 17 , the optical collimation assembly 10 further includes at least one optically transparent substrate 13 . The light-transmitting substrate 13 is made of a light-transmitting material. The light-transmitting substrate 13 is attached to the surface of the incident surface 111 or the output surface 112 . The optical lens 12 is attached to the surface of the light-transmitting substrate 13 and corresponds to a predetermined area of the incident surface 111 or the exit surface 112 . Preferably, one of the optically transparent substrates 13 is attached to the surface of the incident surface 111 of the reflective element 11 , and one of the optical lenses 12 is attached to the surface of the optically transparent substrate 13 , corresponding to the predetermined size of the incident surface 111 . set area. The other optically transparent substrate 13 is attached to the surface of the exit surface 112 of the reflective element 11 , and the other optical lens 12 is attached to the surface of the other optically transparent substrate 13 , corresponding to the surface of the exit surface 112 . Preset area.

The light beam enters the reflective element 11 from the optical lens 12 on the incident surface 111 side, through the transparent sub-substrate 13 on the incident surface 111 side, and passes through the first reflective surfaces 113 parallel to each other. and the second reflective surface 114 reflect at least twice, and then exit from the optical lens 12 of the exit surface 112 through the optically transparent substrate 13 on the exit surface 112 side, and the incident beam and the exit beam parallel.

In another embodiment of the present invention, as shown in FIG. 18A , the optical collimation assembly 10B includes a reflective element 11B. The reflective element 11B includes the reflective main body 115B and the molded body 116B. The reflective main body 115B has two reflective surfaces, namely the first reflective surface 113B and the second reflective surface 114B, the incident surface 111B and the exit surface 112B. Different from the previous embodiments, the first reflection surface 113B and the second reflection surface 114B are respectively implemented as a free-form surface. The reflective element 11B directly collimates the light beam through a free-form surface, so the optical lens can be eliminated in this embodiment. It is worth mentioning that, since the first reflective surface 113B and the second reflective surface 114B are designed as free-form curved surfaces, during the manufacturing process of the reflective element, the light-transmitting medium 100 directly forms corresponding The free-form surface. For example, when the light-transmitting medium 100 is implemented as glass, the light-transmitting medium 100 can be directly molded into a module having the free-form surface, and then the reflective surface is coated.

Preferably, the reflective element 11B has a turning angle α of 50° to 75°. Taking the turning angle α of 60° as an example, the incident angle and the reflection angle of the light beam entering the reflecting body 115B and being reflected by the first reflecting surface 113B or the second reflecting surface 114B are also preferably 60°, so that The beam can be better collimated. In other words, preferably, the incident angle and the reflection angle when the light beam is reflected are equal to the angle of the turning angle of the reflection element 11B.

Optionally, the turning angle of the light beam on the free-form surface is 60° to 150°. Preferably, the turning angle of the light beam on the free-form surface is 90° to 120°. When the angles of the turning angles of the light beam on the first reflecting surface 113B and the second reflecting surface 114B are equal, it can be ensured that the light beam enters vertically from the incident surface 111B and exits vertically from the exit surface 112B, thereby passing through all the The outgoing light rays and the incoming light rays of the optical collimation assembly 10B are kept parallel.

Compared with a flat reflective surface design, free-form surface coating is easier. Secondly, the free-form surface design makes the horizontal displacement insensitive and reduces the assembly difficulty. In the embodiment of the present invention, for the entire structured light projection device, since the optical lens is eliminated, the light tilt can be more easily controlled. The fewer the light beams pass through, the lower the brightness of the device, the higher the efficiency, which can reduce the power of the projection unit to a certain extent; it can further ensure the uniformity of brightness. Of course, the optical collimation assembly 10B may further include at least one optical lens 12B for further collimation. The optical lens 12B is disposed in the predetermined area of the incident surface 111B or the exit surface 112B, so that the light beam is collimated by the free-form surface and the optical lens, so that the beam collimation effect is better, such as shown in Figure 18B.

The reflective element obtained by different cutting methods will be different, and FIG. 19 is a structural diagram of another optical collimation assembly of the present invention. The optical collimation assembly 10A includes the reflective element 11A and at least one of the optical lenses 12A. The reflecting element 11A includes a reflecting body 115A and a molding body 116A.

Different from the previous embodiments, the reflecting body 115A has the first reflecting surface 113A. That is, the reflecting body 115A has only one reflecting surface. The first reflective surface 113A is formed by covering the surface of the light-transmitting medium with a reflective material and then cutting. The reflection body 115A further has the incident surface 111A and the outgoing surface 112A, and the incident surface 111A and the outgoing surface 112A are perpendicular to each other. The first reflection surface 113A faces the incident surface 111A and the exit surface 112A. The molded body 116A covers the first reflection surface 113A.

That is, the cross section of the reflection element 11A is square. The first reflection surface 113A extends along the diagonal of the reflection element 11A. The light beam enters the reflecting element 11A from the incident surface 111A, is reflected once by the first reflecting surface 113A, that is, exits from the exit surface 112A, and the incident light beam and the outgoing light beam are perpendicular. The reflective element 11A can be used in an edge-emitting structured light module, and the reflective element 11A collimates the light emitted by the edge-emitting laser and deflects the optical path.

It is worth mentioning that in some special projection structures, the incident light rays and the outgoing light rays are required to be non-parallel, correspondingly, the first reflection surface 113 and the second reflection surface 114 are not parallel, as shown in FIG. 20 . Show. The relative inclination of the first reflection surface 113 and the second reflection surface 114 is set according to the preset path of the light beam. The non-parallel first reflective surface 113 and the second reflective surface 114 only need to set the first surface and the second surface of the light-transmitting medium 100 correspondingly, which can be achieved by grinding, stamping and other processes. It will not be repeated here.

Further, the reflecting body 115 has a six-sided three-dimensional structure, two of which are the first reflecting surface 113 and the second reflecting surface 114 , the two surfaces are the incident surface 111 and the exiting surface 112 , and the remaining two surfaces are the first reflecting surface 113 and the second reflecting surface 114 In order to prevent the stray light surface, it can be realized by roughening the surface, coating light-shielding material or attaching a light-shielding plate.

According to another aspect of the present invention, the optical collimation assembly of the present invention can be applied to a structured light projection device to achieve the purpose and advantages of the present invention, as shown in FIGS. 23 to 28 .

Specifically, the structured light projection device includes the optical collimation assembly 10 , an optical diffraction element 20 and a projection unit 30 . The optical collimation assembly 10 is disposed between the projection unit 30 and the optical diffraction element 20 . The light beam emitted by the projection unit 30 is collimated by the optical collimation component 10 , and then diffracted or replicated by the optical diffraction element 20 , and then projected onto the surface of the space target. The projection unit 30 may be implemented as a VCSEL (Vertical Cavity Surface Emitting Laser). When the projection unit 30 is implemented as a VCSEL, the projection unit 30 can project a plurality of beams. The optical collimation assembly 10 adopts any of the above-mentioned structures, and the first reflection surface and the second reflection surface can be plane or free-form curved surface, and the optical lens can be directly attached to the incident surface and the reflection surface, It is also possible to use a light-transmitting substrate structure, etc., which is not limited here. The optical diffraction element 20 may adopt a single-layer structure (as shown in FIG. 23 ), or a double-layer structure (as shown in FIG. 24 ), which is not limited in the present invention.

In one embodiment, in order to improve the collimation effect of the structured light projection device, as shown in FIG. 25 , the optical diffractive element 20 includes a collimation part 21 and a diffractive part 22 . The light beam collimated by the optical collimating component 10 is further collimated by the collimating part 21 and then reaches the space target through the diffractive part 22 . The diffractive portion 22 is provided on the light beam exit side of the collimation portion 21, and diffracts and expands the re-collimated light beam. Preferably, the optical diffractive element 20 is implemented as a metalens. Preferably, the collimating part is set as a convex lens or a Fresnel lens, so that collimation can be performed. It is worth mentioning that, in this embodiment, the positional relationship between the collimating part 21 and the diffractive part 22 does not constitute a limitation, and the collimation can also be performed first by diffracting, that is, the collimating part 21 is arranged in the The light beam exit side of the diffractive part 22 .

In an embodiment of the present invention, as shown in FIGS. 26 to 28 , the structured light projection device further includes a circuit board 40 and a detection circuit 50 . The projection unit 30 is disposed on the circuit board 40 and is connected to the circuit board 40 . After the light beam projected by the projection unit 30 is received and collimated by the optical collimation component 10 , it is diffracted and expanded by the optical diffraction element 20 and then projected to a space target. Since the projection unit 30 is implemented as a VCSEL, the projection energy is relatively large, especially the zero-order problem will cause damage to the human eye. Therefore, it is necessary to avoid zero-order diffraction or prevent the light beam from directly reaching the human eye without diffraction. Therefore, it is necessary to ensure that The optical diffractive element 30 has a complete structure, so the detection circuit 50 is disposed on the surface of the optical diffractive element 20 to detect whether the optical diffractive element 20 is complete.

The detection circuit 50 is preferably implemented as ITO (Indium Tin Oxide) plated on the surface of the optical diffractive element 20 . The detection circuit 50 is connected to the circuit board 40 to detect the optical diffraction element 20 . For example, the ITO is coated on the surface of the optical diffraction element 20 to form a capacitor structure. When the surface of the optical diffraction element 20 is damaged or has water vapor or water droplets, the capacitance value of the capacitive structure changes, so that the corresponding processor determines that the optical diffraction element 20 is abnormal, and interrupts the operation of the structured light projection device. Ensure eye safety. The detection circuit 50 can also be formed of other materials (preferably transparent materials), and the detection is performed by means of resistance, inductance, or the like.

It is worth mentioning that the detection circuit 50 needs to be connected to the circuit board 40 . Therefore, in this embodiment of the present invention, LDS (Laser Direct Structuring) is further adopted on the surface of the optical reflection element 10 . The process forms a conduction circuit 60 , and the conduction circuit 60 makes the detection circuit 50 conduct with the circuit board 40 . It is worth mentioning that in the prior art, when the side wall of the reflective element is glass or other substrates, LDS cannot be used to form a circuit. Generally, an external circuit structure is added, thereby increasing the size of the entire projection module. However, in the present invention, since the reflective element adopts the molding process to form the sidewall, and the LDS process can be performed on the molding material, the present invention can dispose the conductive circuit 60 on the molded body through the LDS process. 116 surface, so there is no need to set additional circuits, reducing the difficulty of the process and reducing the overall volume of the projection module.

Alternatively, the conduction circuit 60 is implemented as an electrical conductor. During the manufacturing process, a plurality of conductive parts are provided in advance, after the molding and injection molding are completed, the conductive parts are wrapped in the molding layer 200 , and the detection circuit 50 is connected to the circuit board 40 through the conductive parts .

It should be understood by those skilled in the art that the embodiments of the present invention shown in the above description and the accompanying drawings are only examples and do not limit the present invention. The objects of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been shown and described in the embodiments, and the embodiments of the present invention may be modified or modified in any way without departing from the principles.

Claims (34)

1. A reflective element, characterized in that, comprising: A reflective body and a molded body, wherein the reflective body is made of a solid light-transmitting medium, the reflective body has at least a reflective surface, an incident surface and an exit surface, wherein the molded body is molded and formed on Outside the reflective surface, the light beam enters the reflective element from the incident surface, is reflected at least once by the reflective surface, and then exits from the emitting surface. 2. The reflective element according to claim 1, wherein the reflective surface is formed by covering a surface of a light-transmitting medium with a reflective material. 3 . The reflective element according to claim 1 , wherein the reflective body has two reflective surfaces, wherein the two reflective surfaces are opposite and parallel, and are inclined relative to the incident surface and the outgoing surface, so that The light beam enters the reflective element from the incident surface, is reflected by the reflective surface at least twice, and then exits the outgoing surface, so that the incident light beam and the outgoing light beam are parallel. 4. The reflecting element according to claim 3, wherein the incident surface and the exiting surface are opposite and parallel, and the cross section of the reflecting element is a parallelogram. 5. The reflective element according to claim 3, wherein both of the reflective surfaces are implemented as flat surfaces. 6. The reflective element according to claim 3, wherein both of the reflective surfaces are implemented as free-form surfaces. 7. The reflective element according to claim 6, wherein the inflection angle of the free-form surface is 50° to 75°. 8. The reflective element according to claim 6, wherein the turning angle of the light beam on the free-form surface is 60° to 150°. 9 . The reflective element according to claim 6 , wherein the turning angle of the light beam on the free-form surface is 90° to 120°. 10 . 10. The reflective element according to any one of claims 1 to 9, wherein the reflective body further has at least one stray light preventing surface, and the stray light preventing surface is roughened and coated with a shading material on the surface of the reflective body Or any method of attaching the shading plate to process and form. 11. An optical collimation assembly for use in a structured light projection device, characterized in that it comprises: A reflective element as claimed in any one of claims 1 to 10; and At least one optical lens, wherein the optical lens is installed on the incident surface or \ and the exit preset area to achieve collimation. 12. The optical collimation assembly of claim 11, further comprising at least one optically transparent substrate, wherein the optically transparent substrate is made of a transparent material, wherein the optically transparent substrate is attached to the incident surface or \ and the surface of the exit surface, wherein the optical lens is attached to the surface of the transparent sub-substrate, corresponding to the predetermined area of the incident surface or \ and the exit surface. 13. A structured light projection device, comprising: a projection unit for emitting light beams; The optical collimation assembly of any one of claims 11 or 12, wherein the optical collimation assembly collimates the light beam emitted by the projection unit; and An optical diffractive element, wherein the light beam emitted by the projection unit is collimated by the optical collimation component, and then diffracted or replicated by the optical diffractive element, and then projected onto the surface of the space target. 14. The structured light projection device according to claim 13, wherein the optical diffractive element comprises a collimating part and a diffractive part, wherein the diffractive part is disposed on the beam exit side of the collimating part, so that the The light beam collimated by the optical collimating component is further collimated by the collimating part, and then reaches the space target through the diffractive part. 15. The structured light projection device according to claim 14, further comprising a circuit board and a detection circuit, wherein the projection unit is disposed on the circuit board and is connected to the circuit board, wherein the detection circuit It is arranged on the surface of the optical diffractive element and is connected to the circuit board to detect whether the optical diffractive element is complete. 16. The structured light projection device of claim 15, wherein the detection circuit is implemented as ITO, coated on the surface of the optical diffractive element. 17. The structured light projection device according to claim 15, further comprising a conducting circuit, wherein the conducting circuit conducts the detection circuit and the circuit board, wherein the conducting circuit is formed by adopting an LDS process on the surface of the molded body. 18. The structured light projection device according to claim 15, further comprising a conducting circuit, wherein the conducting circuit conducts the detection circuit and the circuit board, wherein the conducting circuit is connected by the molded body pack. 19. A method for manufacturing an optical collimation assembly for a structured light projection device, comprising: (a) forming a first reflection surface of a transparent medium and a second reflection surface of a transparent medium on the opposite and parallel first and second surfaces of a solid transparent medium; (b) forming a molding layer wrapping the light-transmitting medium having the first reflective surface of the light-transmitting medium and the second reflective surface of the light-transmitting medium, wherein the molding layer is made of an opaque material; (c) cutting the light-transmitting medium with the molding layer at preset intervals to form a plurality of light-transmitting single strips; and (d) arranging the light-transmitting single strips in a preset direction, and cutting the arranged light-transmitting single strips according to a preset cutting line to form a plurality of reflective elements having an incident surface and an exit surface, wherein the extension of the light-transmitting single strip The direction and the extending direction of the cutting line form a preset angle, so that the light beam enters the reflecting element from the incident surface, and exits from the exit surface after being reflected by the reflecting element at least once. 20 . The method for manufacturing an optical collimation assembly according to claim 19 , wherein the step (a) forms the first surface of the light-transmitting medium by covering the first surface and the second surface with a material having reflective properties. 21 . a reflective surface and a second reflective surface of the light-transmitting medium. 21. The method for manufacturing an optical collimation assembly according to claim 19, further comprising: (e) Treating the cut surface of the light-transmitting single strip to form a stray light preventing surface to prevent stray light from entering. 22 . The method for manufacturing an optical collimation assembly according to claim 21 , wherein the step (e) is performed by roughening the cut surface to form the stray light preventing surface. 23 . 23 . The method for manufacturing an optical collimation assembly according to claim 21 , wherein in the step (e), the stray light preventing surface is formed by covering the surface of the cut surface with a light-shielding material. 24 . 24. The method for manufacturing an optical collimation assembly according to claim 21, wherein in the step (d), the light-transmitting single strip extends in a horizontal direction, and the preset cutting direction and the extending direction of the light-transmitting single strip are in a predetermined direction. Set an included angle, and cut the light-transmitting single strip obliquely. 25. The method for manufacturing an optical collimation assembly according to claim 21, wherein in the step (d), the light-transmitting single strip is placed obliquely, and the preset cutting direction extends along a horizontal direction. 26. The method of manufacturing an optical collimation assembly according to claim 19, wherein the step (d) further comprises the step of: (d.1) Arranging the light-transmitting single strips on the substrate in a predetermined direction; and (d.2) The light-transmitting single strip and the substrate are cut according to a preset cutting line to form a plurality of reflective element strips, wherein the extending direction of the light-transmitting single strip and the extending direction of the cutting line are at a predetermined angle, wherein The reflective element strip includes a substrate strip and a plurality of the reflective elements having the incident surface and the outgoing surface arranged on the substrate strip. 27. The method of manufacturing an optical collimation assembly according to claim 19, further comprising: (e) One by one, optical lenses are installed on the predetermined area of the incident surface or the output surface. 28. The method for manufacturing an optical collimation assembly according to claim 26, further comprising: (f) Arranging the reflective element strips according to the spacing between adjacent rows of optical lenses of an optical lens imposition, wherein the arrangement of the optical lenses in the optical lens imposition is the same as the reflective elements in the reflective element strips The arrangement corresponds to; (g) attaching the light-transmitting substrate of the optical lens imposition to the incident surface or the exit surface of the reflective element of the reflective element strip, wherein the optical lens corresponds to a predetermined area of the incident surface or the exit surface . 29. The method for manufacturing an optical collimation assembly according to claim 28, further comprising: (h) removing the substrate strip of the reflective element strip. 30. The method for manufacturing an optical collimation assembly according to claim 28 or 29, further comprising: (i) Dividing the already assembled optical lens imposition and the strip of reflective elements to form a plurality of the optical collimation assemblies. 31. The method for manufacturing an optical collimation assembly according to claim 19, wherein in the step (d), the light-transmitting single strip is cut twice, and the two preset cutting directions are perpendicular to form the reflective element The incident surface and the outgoing surface are perpendicular to each other, so that the light beam enters the reflecting element from the incident surface, and exits from the outgoing surface after being reflected once by the reflecting element. 32. The method for manufacturing an optical collimation assembly according to claim 19, wherein the first surface and the second surface in the step (a) are opposite and parallel free-form surfaces, wherein the step (d) The incident surface and the outgoing surface formed by cutting are corresponding opposite and parallel free-form surfaces. 33. The method for manufacturing an optical collimation assembly according to claim 32, wherein the inflection angle of the free curved surfaces of the incident surface and the exit surface is 50° to 75°. 34 . The method for manufacturing an optical collimation assembly according to claim 26 , wherein in the step (d.1), the light-transmitting single strips are arranged on the substrate in such a manner that the cut surfaces thereof are attached to the substrate. 35 .

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