Laser projector, camera assembly, and electronic device

Abstract

A laser projector, a camera assembly and an electronic device are disclosed. The laser projector includes a substrate assembly, a mirror holder, a bracket, a mirror cover, a laser light source and a diffractive optical element. The mirror holder is fixedly arranged on the substrate assembly, the mirror holder includes a mirror holder through hole, a cross section of the mirror holder through hole is configured as a first polygon; the bracket is arranged in the mirror holder through hole, the bracket is in interference fit with the mirror holder, the bracket includes a first end portion for facing the substrate assembly, a second end portion opposite to the first end portion and a bracket through hole extending from the first end portion to the second end portion, a cross section of a side wall outer surface of the bracket is configured as a second polygon, the second polygon is a similar polygon with the first polygon; the mirror cover accommodates the second end portion of the bracket, the mirror cover is connected to the mirror holder and is movable relative to the mirror holder in a direction of an optical axis of the laser projector; the laser light source is arranged on the substrate assembly and is used for emitting laser light; the diffractive optical element is arranged to the second end portion of the bracket and is used for diffracting the laser light to form a projection pattern.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of imaging technology, in particular, to a laser projector, a camera assembly and an electronic device having the same. BACKGROUND

[0002] The existing projector structure design scheme is to assemble a substrate, a laser light source, a collimating mirror and a diffractive optical element into a projector by using an AA (Active Alignment, active alignment) assembly process, wherein whether to use a collimating mirror is determined according to the type of the diffractive optical element. This scheme has problems of complex production process, high equipment cost and low production efficiency. Therefore, a laser projector is needed to at least partially solve the above problems. SUMMARY

[0003] A series of simplified concepts are introduced in the summary section, which will be further described in detail in the specific embodiment section. The summary section of the present application does not mean to attempt to limit the key features and necessary technical features of the claimed technical solution, nor to attempt to determine the protection scope of the claimed technical solution.

[0004] To at least partially solve the above problems, the first aspect of the present application provides a laser projector, comprising:

[0005] a substrate assembly;

[0006] a mirror seat fixedly arranged on the substrate assembly, the mirror seat comprising a mirror seat through hole, a cross section of the mirror seat through hole being configured as a first polygon;

[0007] a support arranged in the mirror seat through hole, the support being in interference fit with the mirror seat, the support comprising a first end portion for facing the substrate assembly, a second end portion opposite to the first end portion, and a support through hole extending from the first end portion to the second end portion, a cross section of a side wall outer surface of the support being configured as a second polygon, the second polygon being a similar polygon to the first polygon;

[0008] a mirror cover containing the second end portion of the support, the mirror cover being connected to the mirror seat and movable relative to the mirror seat in a direction of an optical axis of the laser projector;

[0009] a laser light source arranged on the substrate assembly for emitting laser light; and

[0010] a diffractive optical element arranged to the second end portion of the support for diffracting the laser light to form a projection pattern.

[0011] According to the application, the mirror cover accommodates the second end of the support and can move relative to the mirror seat along the optical axis, so that during movement of the mirror cover along the optical axis from the second end of the support towards the first end of the support, the mirror cover can contact the support at the second end and move the support from the second end towards the first end, so that the distance between the diffractive optical element and the laser light source can be adjusted, i.e. manual focusing is achieved, which reduces production cost and improves production efficiency. Moreover, since the diffractive optical element is arranged separately from the mirror cover and the support is in contact with the side surface of the multi-prism, during focusing (e.g. rotating the mirror cover), the diffractive optical element and the laser light source will not rotate relative to each other in the circumferential direction, so that the pattern characteristics of the projection pattern can be guaranteed not to be affected (e.g. the direction does not change, or the pattern is distorted due to the focusing action), so that the laser projector can be applied to more application scenarios and more types of diffractive optical elements can be used.

[0012] Optionally, the laser projector further comprises an elastic element, the elastic element is arranged in the through hole of the mirror seat, one end of the elastic element is configured to be immovable relative to the substrate assembly along the optical axis, and the other end of the elastic element abuts against the support.

[0013] In the application, the elastic element can apply a biasing force to the support from the first end towards the second end, which is opposite to the force applied by the mirror cover to the support, so as to further facilitate manual focusing.

[0014] Optionally, one end of the elastic element abuts against the substrate assembly, and the other end of the elastic element abuts against the support.

[0015] Optionally, the elastic element is a spring.

[0016] Optionally, the support comprises an inner protrusion protruding inwardly from the side wall of the through hole of the support, and the elastic element abuts against the inner protrusion.

[0017] Optionally, the support comprises a collimating mirror, the collimating mirror is arranged in the through hole of the support, one end of the elastic element abuts against the substrate assembly, and the other end of the elastic element abuts against the collimating mirror.

[0018] Optionally, the elastic element comprises at least one elastic piece, one end of the elastic piece is fixed to the bottom or inner wall of the through hole of the mirror seat, and the other end of the elastic piece extends towards the inside of the through hole of the mirror seat and abuts against the support.

[0019] Further, the first polygon is a regular polygon, and in the projection of the laser projector along the optical axis, the elastic pieces are mirror-symmetrically distributed or rotationally symmetrically distributed.

[0020] In the application, the elastic element can be flexibly arranged.

[0021] Optionally, the support is provided with an outward protruding outward protrusion on the outer surface of the sidewall of the second end portion,

[0022] The mirror cover comprises a mirror cover through hole, and a radial dimension of the mirror cover through hole on a top wall of the mirror cover is smaller than a radial dimension of a radially outermost edge of the outward protrusion.

[0023] Further, the support is configured to be provided with a stepped structure at a corner of the second polygon in a tip portion of the second end portion to form the outward protrusion.

[0024] In the present application, the outward protrusion is used to contact the mirror cover at the second end portion, and the mirror cover applies a force to the support from the second end portion towards the first end portion through the outward protrusion.

[0025] Optionally, the first polygon and the second polygon are regular polygons.

[0026] In the present application, the support and the mirror seat structure are regular, easy to process and assemble.

[0027] Optionally, the mirror seat comprises an external thread, and the mirror cover comprises an internal thread matched with the external thread.

[0028] Further, the mirror seat and the mirror cover are also connected through adhesion.

[0029] In the present application, the connection mode of the mirror cover and the mirror seat is simple and stable in performance, and the focusing can be performed through a simple rotating action.

[0030] Optionally, the support through hole is provided with a clamping groove at the second end portion for accommodating the diffractive optical element.

[0031] In the present application, the support supports the diffractive optical element in a simple and stable manner.

[0032] Optionally, the diffractive optical element is a separately packaged element, and / or the laser light source is a separately packaged element.

[0033] The laser projector according to the present application is suitable for application scenarios with high reliability requirements, such as automobiles, military equipment, etc.

[0034] Optionally, the diffractive optical element is configured to make the projection pattern have different pattern characteristics in two mutually intersecting directions.

[0035] Further, the diffractive optical element is configured to make the projection pattern have the different pattern characteristics in two mutually perpendicular directions.

[0036] According to the application, the diffraction optical element and the laser light source do not rotate relative to each other in the focusing process, so that the pattern features of the projection pattern are not affected, and thus the application is applicable even in application scenarios where the projection pattern has different pattern features in two directions.

[0037] A second aspect of the application provides a camera assembly comprising:

[0038] The laser projector described above;

[0039] An image collector configured to collect a laser image formed by the projection pattern of the laser projector; and

[0040] A processor configured to process the laser image to obtain a depth image.

[0041] According to the application, the laser projector can be manually focused, so that the production cost of the camera assembly is reduced and the production efficiency is improved. The laser projector can ensure that the pattern features of the projection pattern are not affected, so that the camera assembly can be applied to more application scenarios and can use more types of diffraction optical elements.

[0042] A third aspect of the application provides an electronic device comprising:

[0043] A housing; and

[0044] The camera assembly described above, which is arranged to the housing and exposed from the housing to obtain a depth image.

[0045] According to the application, the laser projector of the camera assembly can be manually focused, so that the production cost of the electronic device is reduced and the production efficiency is improved. The laser projector of the camera assembly can ensure that the pattern features of the projection pattern are not affected, so that the electronic device can be applied to more application scenarios and can use more types of diffraction optical elements. BRIEF DESCRIPTION OF DRAWINGS

[0046] The following drawings of the application are hereby incorporated into this application as part of the application for the purpose of understanding the application. The embodiments of the application and the description thereof shown in the drawings are used to explain the principles of the application.

[0047] In the drawings:

[0048] Figure 1 It is an appearance perspective view of the laser projector according to the preferred embodiment of the application;

[0049] Figure 2 It is an axial sectional view of the laser projector according to the specific embodiment of the application;

[0050] Figure 3 It is an exploded view of the laser projector shown in the figure; Figure 2 The exploded view of the laser projector shown in the figure;

[0051] Figure 4 Fig. 1 is a perspective view of a laser projector according to an embodiment of the present application; Figure 2 Fig. 2 is a top perspective view of a bracket of the laser projector shown in Fig. 1;

[0052] Figure 5 Fig. 3 is a bottom perspective view of the bracket of the laser projector shown in Fig. 1; Figure 2 Fig. 4 is an axial sectional view of the bracket shown in Fig. 1;

[0053] Figure 6 Fig. 5 is an axial sectional view of the bracket according to another embodiment of the present application; Figure 4

[0054] Fig. 6 is an axial sectional view of the bracket according to another embodiment of the present application; Figure 7

[0055] Fig. 7 is an axial sectional view of the bracket according to another embodiment of the present application; Figure 8 Figure 7 Fig. 8 is an axial sectional view of the bracket according to another embodiment of the present application;

[0056] Figure 9 Fig. 9 is a perspective view of a mirror holder and an elastic element of the laser projector according to another embodiment of the present application;

[0057] Figure 10 Fig. 10 is an axial sectional view of the components shown in Fig. 9; and Figure 9

[0058] Fig. 11 is a bottom view of the components shown in Fig. 9. Figure 11 Figure 9 BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Explanation of Reference Numerals:

[0060] 10: substrate assembly

[0061] 20: elastic element

[0062] 21: spring

[0063] 22: elastic piece

[0064] 30: mirror holder

[0065] 31: mirror holder through-hole

[0066] 32: external thread

[0067] 39: first polygon

[0068] 40: laser light source

[0069] 50: bracket

[0070] 51: bracket through-hole

[0071] 52: collimator mirror

[0072] 53: first end portion​​

[0073] 54: second end portion

[0074] 55: inner protrusion

[0075] 56: outer protrusion

[0076] 56a: outermost edge

[0077] 57: slot

[0078] 58: tip portion

[0079] 59: second polygon

[0080] 60: diffractive optical element

[0081] 70: mirror cover

[0082] 71: mirror cover through hole

[0083] 72: internal thread

[0084] 73: top wall

[0085] 73a: opening

[0086] 74: side wall

[0087] 74a: accommodation space

[0088] 100: laser projector

[0089] L: optical axis DETAILED DESCRIPTION

[0090] In the following description, numerous specific details are set forth to provide a more thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the present application can be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the present application.

[0091] For a thorough understanding of the present application, reference is made to the following detailed description. It is appreciated that the embodiments provided are for the purpose of disclosure and full and complete disclosure of the exemplary embodiments of the present application, and to convey the full scope of the concepts underlying the exemplary embodiments of the present application to those who are skilled in the art. It is apparent that the practice of the embodiments of the present application is not limited to the particular details of construction and arrangement of parts as set forth herein. The preferred embodiments of the present application are described in detail below, however, the present application can have other embodiments in addition to those described.

[0092] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof.

[0093] The ordinal numbers such as "first" and "second" used in this invention are merely identifiers and do not have any other meaning, such as a specific order. Moreover, for example, the term "first component" does not imply the existence of "second component," and the term "second component" does not imply the existence of "first component."

[0094] It should be noted that the terms “up,” “down,” “front,” “back,” “left,” “right,” “inner,” “outer,” and similar expressions used in this article are for illustrative purposes only and are not intended to be restrictive.

[0095] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings.

[0096] A first aspect of the present invention provides a laser projector.

[0097] like Figures 1 to 3 As shown, in a preferred embodiment, the laser projector 100 includes a substrate assembly 10, a mirror mount 30, a laser source 40, a support 50, a diffractive optical element 60, and a mirror cover 70. The laser source 40 is disposed on the substrate assembly 10 and is used to emit laser light. The laser source 40 has an optical axis L, which is also the optical axis of the laser projector 100. The mirror mount 30 is fixedly disposed on the substrate assembly 10. The mirror mount 30 includes a mirror mount through-hole 31. The mirror mount through-hole 31 extends along the direction of the optical axis L. The cross-sectional structure of the mirror mount through-hole 31 is a first polygon 39. Alternatively, the mirror mount through-hole 31 is constructed as a polygonal prism, and the cross-sectional shape of the polygon is the first polygon 39. The support 50 is disposed in the mirror mount through-hole 31. The support 50 and the mirror mount 30 are press-fitted, that is, the outer surface of the support 50 is press-fitted with the inner surface of the mirror mount through-hole. Figures 4 to 6As shown, the holder 50 includes a first end 53 for facing the substrate assembly 10, a second end 54 opposite to the first end 53, and a holder through-hole 51 extending from the first end 53 to the second end 54. The holder through-hole 51 also extends along the direction of the optical axis L. The cross-sectional configuration of the outer surface of the sidewall of the holder 50 is configured as a second polygon 59, i.e., the holder 50 is configured as a multi-prism shape, and the cross-sectional shape of the multi-prism is configured as the second polygon 59. The mirror cover 70 accommodates the second end 54 of the holder 50. The mirror cover 70 is connected to the mirror seat 30 and is movable relative to the mirror seat 30 along the direction of the optical axis L. The diffractive optical element 60 is disposed to the second end 54 of the holder 50 for diffracting the laser light to form a projection pattern. The optical axis of the diffractive optical element 60 coincides with the optical axis L of the laser light source 40.

[0098] Preferably, the holder through-hole 51 is provided with a clamping groove 57 at the second end 54 for accommodating the diffractive optical element 60.

[0099] When the above-mentioned elements are assembled together, since the mirror cover 70 accommodates the second end 54 of the holder 50 and is movable relative to the mirror seat 30 along the direction of the optical axis L, when the mirror cover 70 is moved along the direction of the optical axis L towards the substrate assembly 10, the mirror cover 70 can contact the second end 54 of the holder 50, thereby driving the holder 50 to move towards the substrate assembly 10. Since the laser light source 40 is disposed on the substrate assembly 10 and the diffractive optical element 60 is disposed at the second end 54 of the holder 50, the movement of the holder 50 along the direction of the optical axis L (also referred to as axial movement) can change the axial distance between the diffractive optical element 60 and the laser light source 40, thus enabling manual adjustment of the focus for different projection distances. It can be understood that the appropriate position of the holder 50 (also the appropriate position of the diffractive optical element 60) is the position when the focal length is aligned, and the holder 50 needs to be kept at this appropriate position. It can be understood that, in the case of the diffractive optical element 60 having a collimation function, the appropriate position of the holder 50 (also the appropriate position of the diffractive optical element 60) is the position when the collimation function is aligned, and the holder 50 needs to be kept at this appropriate position. Figure 2 And Figure 3 In the embodiment shown, the diffractive optical element 60 has a collimation function.

[0100] Because the first polygon 39 and the second polygon 59 are in interference fit, the holder 50 can stay at a desired position relative to the lens seat 30. Also, the contact mode of the polygons makes the holder 50 unable to rotate circumferentially relative to the lens seat 30. For example, when the diffractive optical element 60 is configured to have different pattern features in two mutually intersecting directions (i.e. two directions in a plane perpendicular to the optical axis L), preferably in two mutually perpendicular directions, the above-mentioned focusing method will not make the holder 50 rotate circumferentially, nor will it make the diffractive optical element 60 rotate circumferentially relative to the laser light source 40, thus ensuring that the pattern features of the projection pattern in the two directions will not be affected, for example, ensuring that the direction of the projection pattern will not change due to the focusing action, or that the horizontal and vertical features of the projection pattern will remain parallel in the horizontal and vertical directions respectively before and after focusing, i.e. no distortion will occur.

[0101] Preferably, the second polygon 59 and the first polygon 39 are similar polygons, for example, both are quadrilaterals, pentagons, hexagons, etc. This can make the outer surface of the holder 50 parallel to the corresponding inner surface of the lens seat through hole 31 when the holder 50 moves in the lens seat through hole 31, i.e. make the axis of the holder 50 parallel to or overlap with the axis of the lens seat through hole 31, so as not to affect the parallelism between the diffractive optical element 60 and the laser light source 40 (i.e. make the corresponding edges of the diffractive optical element 60 and the light emitting surface of the laser light source 40 in a plane perpendicular to the optical axis L parallel), i.e. make the diffractive optical element 60 coaxial with the laser light source 40.

[0102] Preferably, the second polygon 59 and the first polygon 39 are similar regular polygons, for example, both are regular hexagons, regular quadrilaterals, etc. Preferably, the second polygon 59 and the first polygon 39 are congruent polygons.

[0103] Preferably, the laser projector 100 is configured such that the optical axis L of the laser light source 40 is aligned with the center of the substrate assembly 10; the axis of the lens seat through hole 31 is aligned with the optical axis L; the central axis of the holder clamping groove 57 is aligned with the optical axis L; the long and short edges of the lens seat 30 are parallel to the long and short edges of the light emitting surface of the laser light source 40; and the optical axis of the diffractive optical element 60 is aligned with the axis of the clamping groove 57.

[0104] In order to meet higher reliability requirements, for example, to meet the needs of automotive and military equipment, the diffractive optical element 60 is a separately packaged element, and / or the laser light source 40 is a separately packaged element.

[0105] For example, the laser light source 40 can be a laser diode, and the diffractive optical element 60 can be a diffractive optical element configured to diffract the light emitted by the laser diode into a projection pattern. Figure 3As shown, the lens cover 70 includes a top wall 73 and a side wall 74. The side wall 74 is connected to the top wall 73 at its outer periphery. The side wall 74 surrounds an internal receiving space 74a. The top wall 73 is provided with a lens cover opening 73a. The receiving space 74a of the opening 73a is connected, so the opening 73a and the receiving space 74a can also be regarded as a whole as a lens cover through hole 71, that is, the lens cover through hole 71 includes the portion 73a surrounded by the top wall 73 and the portion 74a surrounded by the side wall 74.

[0106] like Figure 2 and Figure 3 As shown, the lens mount 30 includes an external thread 32, and the lens cover 70 includes an internal thread 72 that matches the external thread 32 (the internal thread 72 is disposed on the side wall of the receiving space 74a, i.e., the inner surface of the lens cover side wall 74). Therefore, the lens cover 70 is threadedly connected to the lens mount 30, and when the lens cover 70 rotates relative to the lens mount 30 by means of the threaded structure, the lens cover 70 moves axially relative to the lens mount 30.

[0107] like Figures 4 to 6 As shown, the bracket 50 also includes an outwardly protruding portion 56 disposed at the second end 54. The outwardly protruding portion 56 protrudes outward from the outer surface of the side wall 54a of the second end 54. For example, in the end portion 58 of the second end 54, a stepped structure is provided at the corner of the second polygon 59 to form the outwardly protruding portion 56. Meanwhile, the radial dimension of the lens cover through-hole 71 in the top wall 73 of the lens cover 70 (i.e., the radial dimension of the opening 73a) is smaller than the radial dimension of the outermost radial edge 56a of the outwardly protruding portion 56, and greater than or equal to the radial dimension of the end portion 58 of the second end 54. Figure 2 As shown, when the lens cap 70 is fastened to the lens mount 30, the end portion 58 of the second end 54 of the bracket 60 is located in the opening 73a, while the outward protrusion 56 can contact the top wall 73 of the lens cap. Thus, the lens cap 70 applies force to the bracket 50 through the outward protrusion 56.

[0108] Preferably, similarly, a step structure (e.g. formed by material missing or chamfering) can also be formed at the corner of the second polygon 59 at the first end 53, so that the radial dimension of the radially outermost edge 56a of the outer protrusion 56 is larger than the radial dimension of the lens seat through hole 31, so that the holder 50 will not enter the lens seat through hole 31 completely, so as to facilitate the removal of the holder 50 from the lens seat through hole 31. Alternatively, it can also be understood that the holder 50 is composed of the first end 53, the second end 54 and the outer protrusion 56. Among them, the outer protrusion 56 is located between the first end 53 and the second end 54. The outer protrusion 56 protrudes outward from the side wall outer surface of the holder 50. The radial dimension of the outer protrusion 56 is larger than the radial dimension of the first end 53. The radial dimension of the outer protrusion 56 is larger than the radial dimension of the second end 54. Preferably, the outer protrusion 56 is configured in the form of a step at the corner of the second polygon 59, so that the radial dimension of the outer protrusion 56 is larger than the radial dimension of the first end 53 and the radial dimension of the second end 54. It can be understood that after the first end 53 and the second end 54 are separated by the outer protrusion 56, the second end 54 will no longer enter the lens seat through hole 31. At this time, the first end 53 of the holder 50 is in interference fit with the lens seat 30.

[0109] As shown in Figure 2 and Figure 3 Preferably, the laser projector 100 further comprises an elastic element 20. The elastic element 20 is arranged in the lens seat through hole 31. One end of the elastic element 20 is configured to be immovable relative to the substrate assembly 10 in the direction of the optical axis L, and the other end abuts against the holder 50. The elastic element 20 is configured to apply an elastic force to the holder 50, and the direction of the elastic force is from the first end 53 toward the second end 54. Therefore, the mirror cover 70 applies a force to the holder from the second end 54 toward the first end 53, and the elastic element 20 applies a force in the opposite direction, and the two forces make the holder 50 stay at a suitable position in the lens seat through hole 31. At the same time, when the mirror cover 70 is rotated in the opposite direction to cancel the force from the second end 54 toward the first end 53 applied by the mirror cover 70 to the holder 50, the holder 50 will move axially from the first end 53 toward the second end 54 under the action of the elastic element 20 (so that the biasing force of the elastic element 20 can resist the frictional force of the interference fit between the holder 50 and the lens seat 30, which is a technology mastered by those skilled in the art, and will not be described here). Therefore, the elastic element 20 cooperates with the mirror cover 70 to more conveniently adjust the position of the holder 50 in the axial direction.

[0110] Specifically, the elastic element 20 can be configured to abut against the substrate assembly 10 at one end and abut against the holder 50 at the other end. For example, in the embodiment shown in Figure 2 and Figure 3 The elastic element 20 can be a spring 21. The holder 50 comprises an inner protrusion 55 protruding inwardly from the side wall of the holder through hole 51 (see Figure 6One end of the spring 21 abuts against the substrate assembly 10, and the other end abuts against the inner protrusion 55 of the holder 50. Of course, the spring 21 can also have one end abutting against the substrate assembly 10 and the other end abutting against the first end portion 53 of the holder 50 (i.e. the spring 21 is sandwiched between the substrate assembly 10 and the holder 50). The spring 21 can be made of plastic or metal, for example.

[0111] Alternatively, in the embodiment as shown in FIG. 6, the diffractive optical element 60 does not have the collimating function, and the laser projector 100 needs to add a collimating mirror. Specifically, the holder 50 includes a collimating mirror 52, which is disposed in the holder through-hole 51. Preferably, the collimating mirror 52 is closer to the second end 54 than to the first end 53. One end of the elastic element 20 abuts against the substrate assembly 10, and the other end abuts against the side of the collimating mirror 52 facing the substrate assembly 10. Of course, the elastic element 20 can also have one end abutting against the substrate assembly 10 and the other end abutting against the first end portion 53 of the holder 50 (i.e. the elastic element 20 is sandwiched between the substrate assembly 10 and the holder 50). Figure 7 and Figure 8 Alternatively, in the embodiment as shown in FIG. 6, the diffractive optical element 60 does not have the collimating function, and the laser projector 100 needs to add a collimating mirror. Specifically, the holder 50 includes a collimating mirror 52, which is disposed in the holder through-hole 51. Preferably, the collimating mirror 52 is closer to the second end 54 than to the first end 53. One end of the elastic element 20 abuts against the substrate assembly 10, and the other end abuts against the side of the collimating mirror 52 facing the substrate assembly 10. Of course, the elastic element 20 can also have one end abutting against the substrate assembly 10 and the other end abutting against the first end portion 53 of the holder 50 (i.e. the elastic element 20 is sandwiched between the substrate assembly 10 and the holder 50).

[0112] It can be understood that the threads of the lens seat 30 and the lens cover 70 match each other with a certain torsion force, which can meet the requirement of fixing the lens seat 30 relative to the lens cover 70, i.e. fixing the holder 50 at the position where the focal lengths are aligned. Preferably, the lens cover 70 can be permanently fixed to the lens seat 30 by, for example, glue bonding, so as to ensure that the holder 50 is permanently fixed at the position where the focal lengths are aligned.

[0113] Alternatively, in the embodiment as shown in FIG. 6, the diffractive optical element 60 does not have the collimating function, and the laser projector 100 needs to add a collimating mirror. Specifically, the holder 50 includes a collimating mirror 52, which is disposed in the holder through-hole 51. Preferably, the collimating mirror 52 is closer to the second end 54 than to the first end 53. One end of the elastic element 20 abuts against the substrate assembly 10, and the other end abuts against the side of the collimating mirror 52 facing the substrate assembly 10. Of course, the elastic element 20 can also have one end abutting against the substrate assembly 10 and the other end abutting against the first end portion 53 of the holder 50 (i.e. the elastic element 20 is sandwiched between the substrate assembly 10 and the holder 50). Figures 9 to 11 Alternatively, in the embodiment as shown in FIG. 6, the diffractive optical element 60 does not have the collimating function, and the laser projector 100 needs to add a collimating mirror. Specifically, the holder 50 includes a collimating mirror 52, which is disposed in the holder through-hole 51. Preferably, the collimating mirror 52 is closer to the second end 54 than to the first end 53. One end of the elastic element 20 abuts against the substrate assembly 10, and the other end abuts against the side of the collimating mirror 52 facing the substrate assembly 10. Of course, the elastic element 20 can also have one end abutting against the substrate assembly 10 and the other end abutting against the first end portion 53 of the holder 50 (i.e. the elastic element 20 is sandwiched between the substrate assembly 10 and the holder 50).

[0114] Figure 11 Alternatively, in the embodiment as shown in FIG. 6, the diffractive optical element 60 does not have the collimating function, and the laser projector 100 needs to add a collimating mirror. Specifically, the holder 50 includes a collimating mirror 52, which is disposed in the holder through-hole 51. Preferably, the collimating mirror 52 is closer to the second end 54 than to the first end 53. One end of the elastic element 20 abuts against the substrate assembly 10, and the other end abuts against the side of the collimating mirror 52 facing the substrate assembly 10. Of course, the elastic element 20 can also have one end abutting against the substrate assembly 10 and the other end abutting against the first end portion 53 of the holder 50 (i.e. the elastic element 20 is sandwiched between the substrate assembly 10 and the holder 50).

[0115] ​In the present application, the substrate assembly 10 may, for example, adopt a PCB substrate, a copper substrate, an aluminum substrate, a BT (Bismaleimide Triazine) resin substrate, etc.; the laser light source 40 may, for example, adopt an EEL (Edge Emitting Laser) or a VCSEL (Vertical-Cavity Surface-Emitting Laser); the lens holder 30, the lens cover 70, and the holder 50 may, for example, adopt a plastic, a ceramic, a metal, etc.; and the diffractive optical element 60 may, for example, adopt a PC (Polycarbonate), a PET (Polyethylene Terephthalate), a UV curing material, a glass, a transparent alumina material, etc.

[0116] The laser light source 40 is bonded to the substrate assembly 10, which may, for example, adopt an SMT (Surface Mount Technology) soldering process, a silver glue die bond process, a eutectic die bond process, etc.; the lens holder 30 is bonded to the substrate assembly 10, which may, for example, adopt an SMT soldering process, a capacitive energy storage welding process, a holder bond process, etc.; and the diffractive optical element 60 is bonded to the holder 50, which may, for example, adopt an IRCF bond process, a brazing process, etc.

[0117] The laser projector 100 may, for example, be designed in an SMD (Surface Mounted Devices) form and applied by SMT (Surface Mount Technology) soldering; or may, for example, be designed in a form with an FPC (Flexible Printed Circuit) and applied by direct electrical connection through a connector.

[0118] In summary, the laser projector 100 according to the present application can manually adjust the focal length, and in the focusing process, the diffractive optical element 60 and the laser light source 40 only change the axial distance and do not rotate relative to each other in the circumferential direction, so as not to affect the pattern characteristics of the projection pattern, for example, to ensure that the horizontal and vertical characteristics of the projection pattern are parallel in the horizontal and vertical directions, respectively.

[0119] The second aspect of the present application provides a camera assembly, in preferred embodiments, the camera assembly comprises the above-mentioned laser projector 100, an image collector and a processor. The image collector is configured to collect a laser image formed by the projected pattern projected by the laser projector 100 into the target space, and the processor is configured to process the laser image to obtain a depth image. The image collector is for example an infrared camera. The processor is for example configured to calculate the deviation of each pixel point in the laser image from each corresponding pixel point in a reference laser image using a DIC (Digital Image Correlation) algorithm, and then obtain the depth image according to the deviation value.

[0120] The third aspect of the present application provides an electronic device, in preferred embodiments, the electronic device comprises a housing and the above-mentioned camera assembly according to the present application. The camera assembly is arranged to the housing and exposed from the housing to obtain a depth image. The electronic device according to the present application is for example a mobile phone, a bracelet, a watch, a tablet computer, smart glasses, a smart helmet, a body sensing game device, etc.

[0121] The camera assembly and the electronic device according to the present application have all the features and effects of the laser projector according to the present application.

[0122] Unless otherwise defined, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. Features described in one embodiment can be applied to another embodiment, unless the features are not applicable or are otherwise described.

[0123] The present application has been described by the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of example and illustration, and the present application is not limited to the above-mentioned embodiments, and more kinds of variations and modifications can be made according to the teachings of the present application, which all fall within the scope of the present application.

Claims

1. A laser projector, characterized in that, include: Substrate assembly; A lens mount is fixedly disposed on the substrate assembly. The lens mount includes a lens mount through hole, and the cross-sectional structure of the lens mount through hole is a first polygon. A bracket is disposed in the through hole of the mirror mount and is interference-fitted with the mirror mount. The bracket includes a first end facing the substrate assembly, a second end opposite to the first end, and a bracket through hole extending from the first end to the second end. The cross-sectional structure of the outer surface of the sidewall of the bracket is a second polygon, and the second polygon is a similar polygon to the first polygon. A mirror cover that accommodates the second end of the bracket, the mirror cover being connected to the mirror base and movable relative to the mirror base along the optical axis of the laser projector, and the mirror cover being capable of moving the bracket along the optical axis toward the substrate assembly; A laser source, which is disposed on the substrate assembly, is used to emit laser light; and A diffractive optical element is disposed at the second end of the bracket for diffracting the laser to form a projection pattern.

2. The laser projector according to claim 1, characterized in that, It also includes an elastic element disposed in the through hole of the mirror mount, one end of the elastic element being configured to be immovable relative to the substrate assembly along the optical axis, and the other end of the elastic element abutting against the bracket.

3. The laser projector according to claim 2, characterized in that, One end of the elastic element abuts against the substrate assembly, and the other end of the elastic element abuts against the support.

4. The laser projector according to claim 3, characterized in that, The elastic element is a spring.

5. The laser projector according to claim 3, characterized in that, The bracket includes an inwardly projecting portion protruding from the sidewall of the bracket through hole, and the elastic element abuts against the inwardly projecting portion.

6. The laser projector according to claim 3, characterized in that, The support includes a collimating lens disposed in a through hole of the support, one end of the elastic element abuts against the substrate assembly, and the other end of the elastic element abuts against the collimating lens.

7. The laser projector according to claim 2, characterized in that, The elastic element includes at least one spring piece, one end of which is fixed to the bottom or inner wall of the lens mount through hole, and the other end of which extends toward the inside of the lens mount through hole and abuts against the bracket.

8. The laser projector according to claim 7, characterized in that, The first polygon is a regular polygon, and in the projection of the laser projector along the optical axis, the spring pieces are distributed in a mirror-symmetric or rotationally symmetric manner.

9. The laser projector according to claim 1, characterized in that, The bracket has an outwardly protruding portion on the outer surface of the side wall at the second end. The lens cover includes a lens cover through hole, the radial dimension of which on the top wall of the lens cover is smaller than the radial dimension of the outermost radial edge of the outward protrusion.

10. The laser projector according to claim 9, characterized in that, The bracket is constructed such that, in the end portion of the second end, a stepped structure is provided at the corner of the second polygon to form the outward protrusion.

11. The laser projector according to claim 1, characterized in that, The first polygon and the second polygon are regular polygons.

12. The laser projector according to any one of claims 1-11, characterized in that, The mirror mount includes an external thread, and the mirror cover includes an internal thread that matches the external thread.

13. The laser projector according to claim 12, characterized in that, The mirror base and the mirror cover are also connected by adhesive bonding.

14. The laser projector according to any one of claims 1-11, characterized in that, The support through hole has a slot at the second end for accommodating the diffractive optical element.

15. The laser projector according to any one of claims 1-11, characterized in that, The diffractive optical element is a separately packaged element, and / or the laser source is a separately packaged element.

16. The laser projector according to any one of claims 1-11, characterized in that, The diffractive optical element is configured such that the projected pattern has different pattern features in two intersecting directions.

17. The laser projector according to claim 16, characterized in that, The diffractive optical element is configured such that the projected pattern has the different pattern features in two mutually perpendicular directions.

18. A camera assembly, characterized in that, include: Laser projector according to any one of claims 1-17; An image acquisition device is used to acquire a laser image formed by the projection pattern of the laser projector; and A processor for processing the laser image to obtain a depth image.

19. An electronic device, characterized in that, include: shell; and The camera assembly of claim 18 is disposed to and exposed from the housing to obtain a depth image.

Images