CN115580720A - Projection lens, light projector and depth camera module - Google Patents

Abstract

The invention provides a projection lens, a light projector and a depth camera module, which comprise a first lens, a second lens, a lamp mirror and a lens cone; the first lens and the second lens are arranged on the light incident side of the lens barrel; the lamp mirror is arranged on the light-emitting side of the lens cone; the first lens is used for converging a plurality of laser beams projected by the light source and projecting the laser beams to the second lens; the second lens is used for converging the laser beams projected by the first lens again and projecting the laser beams to the light incident surface of the lamp mirror; the lamp mirror is used for enabling the incident multiple laser beams to be emitted in parallel or to be emitted nearly in parallel. The invention converges light rays to the lamp lens through the first lens and the second lens, and the diaphragm is positioned on the light incident surface of the lamp lens, so that the depth camera module with the projection lens is suitable for being installed in a narrow gap without being shielded by an FOV (field of view), the application of the invention on a narrow-frame screen is realized, and the lamp lens can be attached to a mobile phone glass cover plate to play a dustproof role.

Description

Projection lens, light projector and depth camera module

Technical Field

The present invention relates to the field of display technologies, and in particular, to a projection lens, a light projector, and a depth camera module.

Background

With the development of the market, the requirements of consumers on the display effect of the display screen are more and more stringent, and the requirements are not only on diversified appearance designs, but also on the requirement that the screen ratio is higher and better. The full screen technology realizes the screen occupation ratio of more than 90 percent by the design of an ultra-narrow frame or even no frame.

The mobile phone with the comprehensive screen realizes the maximization of the display area under the condition that the mobile phone body is not changed, so that the display effect is more brilliant. Present structural design based on full-face screen, for devices such as the degree of depth camera module in the installation 3D camera module, set up the non-display area at display substrate's top, bang district promptly, but, still can influence display device's pleasing to the eye and the experience of full screen like this.

Disclosure of Invention

In view of the above, the present invention provides a projection lens, a light projector and a depth camera module, so as to solve the problem that the non-display area of the existing depth camera module affects the beauty and the overall screen experience of the display device.

In order to achieve the purpose, the invention provides the following technical scheme:

the projection lens provided by the invention comprises a first lens, a second lens, a lamp mirror and a lens cone;

the first lens and the second lens are arranged on the light incident side of the lens barrel; the lamp mirror is arranged on the light-emitting side of the lens barrel;

the first lens is used for converging a plurality of laser beams projected by the light source and then projecting the laser beams to the second lens;

the second lens is used for converging the laser beams projected by the first lens again and then projecting the laser beams to the light inlet surface of the lamp mirror;

the lamp mirror is used for enabling the incident multiple laser beams to be emitted in parallel or approximately emitted in parallel.

Preferably, a concave light inlet is arranged on the light inlet side of the lamp mirror;

the bottom surface of the light inlet is a light inlet surface; the light incident surface is a convex surface; the diaphragm of the second lens is arranged on the convex surface;

the light incident surface is used for enabling the incident multiple laser beams to be emitted in parallel or to be emitted approximately in parallel.

Preferably, a spacer is disposed between the first lens and the second lens.

Preferably, a boss structure is arranged on the light-emitting side of the lamp mirror;

the end face of the boss structure is a light emergent face.

Preferably, the first lens and the second lens are convex lenses.

Preferably, the light incident side surface of the lamp mirror is attached to the second lens.

Preferably, the lens barrel is provided with a bulkhead;

the second lens is arranged on one side face of the partition frame, and the lens barrel is arranged on the other side face of the partition frame.

Preferably, the lamp mirror is made of an optical plastic material.

The light projector provided by the invention comprises the projection lens and a structured light projector;

the structured light projector is used for projecting structured light to the projection lens, and the structured light comprises a plurality of beams of laser light which are distributed randomly;

the projection lens is used for converging the multiple laser beams and then enabling the multiple laser beams to enter the light inlet surface of the lamp mirror, and then enabling the multiple laser beams to be emitted in parallel or to be emitted nearly in parallel through the lamp mirror.

The depth camera module provided by the invention comprises a light projector and an imaging module;

the light projector is used for enabling the incident multiple laser beams to be emitted in parallel or approximately emitted in parallel through the lamp mirror so as to enable the laser beams to irradiate an object to be shot;

the imaging module is used for receiving the laser reflected by the object to be shot through the other light-transmitting area and obtaining a depth image of the surface of the object to be shot according to the received spot pattern of the laser reflected by the object to be shot.

Compared with the prior art, the invention has the following beneficial effects:

the invention converges the light to the lamp lens through the first lens and the second lens, and the diaphragm is positioned on the light incident surface of the lamp lens, so that the depth camera module with the projection lens is suitable for being installed in a narrow gap without shielding FOV, thus realizing the application of the invention on a narrow-frame screen (a screen with a narrow black matrix area), and also enabling the lamp lens to be tightly attached to a mobile phone glass cover plate to play a role of dust prevention.

Drawings

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

FIG. 1 is a schematic diagram of a display device according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a display device according to a variation of the present invention;

FIG. 3 is a schematic view of an installation of a laser module according to an embodiment of the present invention;

FIG. 4 is another schematic illustration of an installation of a laser module in an embodiment of the invention;

FIG. 5 is a schematic view of an imaging module in an embodiment of the invention;

FIG. 6 is a schematic view of an installation of a depth camera module according to a variation of the present invention;

FIG. 7 is a schematic view of another installation of a depth camera module according to a variation of the present invention;

FIG. 8 is a schematic diagram of a display device based on an EEL laser according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of a VCSEL laser based display device in an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a display device according to a first embodiment of the invention;

fig. 11 is a schematic structural diagram of a display device according to a second embodiment of the invention;

FIG. 12 is a schematic structural diagram of a projection lens according to an embodiment of the invention;

FIG. 13 is a schematic view of another structure of a projection lens according to an embodiment of the invention;

FIG. 14 is a spot diagram of multiple lasers according to an embodiment of the present invention.

In the figure:

10 is a display substrate; 11 is a laser module; 12 is an imaging module; 1201 is a second lamp mirror; 1202 is receiving lens; 1203 is a photodetector array; 13 is a light splitting device; 14 is a driving circuit; 15 is a processing module; 16 is a lens assembly; 1601 is a first lens; 1602 is a second lens; 1603 is a space ring; 1604 is a lens barrel; 1605 is a bulkhead; 17 is a reflecting device; 18 is a collimating lens; 19 is a first lamp mirror; 20 is a black matrix region; 30 is a display area; 40 is an inner screen.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the concept of the invention. All falling within the scope of the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element. The connection may be for fixing or for circuit connection.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the embodiments of the present invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be in any way limiting of the present invention.

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

As described in the background art, in the existing structural design based on a full-face screen, in order to install devices such as a depth camera module in a 3D camera module, a non-display area, i.e., a bang area, is disposed at the top of a display substrate, but this may affect the beauty and the overall screen experience of the display device.

The inventor has found that, in the existing depth camera modules, a Vertical Cavity Surface Emitting Laser (VCSEL) is used as a light source, but since the output optical power of the VCSEL Laser is low, when the transmittance of the display substrate is low, the optical power of the Laser passing through the display panel is low, and an effective depth image cannot be obtained, it is necessary to provide a bang area, which is a non-display area, on the top of the display substrate, and to dig a hole in the non-display area to install the VCSEL Laser.

Based on this, the invention provides a projection lens, a light projector and a depth camera module to overcome the above problems in the prior art, comprising a first lens, a second lens, a lamp lens and a lens barrel;

the first lens and the second lens are arranged on the light inlet side of the lens barrel; the lamp mirror is arranged on the light-emitting side of the lens barrel;

the first lens is used for converging a plurality of laser beams projected by the light source and projecting the laser beams to the second lens;

the second lens is used for converging the laser beams projected by the first lens again and then projecting the laser beams to the light inlet surface of the lamp mirror;

the lamp mirror is used for enabling the incident multiple laser beams to be emitted in parallel or to be emitted nearly in parallel.

The first lens and the second lens converge light rays onto the lamp lens, and the diaphragm is positioned on the light incident surface of the lamp lens, so that the depth camera module with the projection lens is suitable for being installed in a narrow gap without being shielded by an FOV (field of view), the application of the depth camera module on a narrow-frame screen (a narrow screen with a black matrix area) is realized, and the lamp lens can be tightly attached to a mobile phone glass cover plate to play a dustproof role.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, so that the above is the core idea of the present invention, and the above objects, features and advantages of the present invention can be more clearly understood. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

An embodiment of the present invention provides a display device with a 3D camera module, as shown in fig. 1, including a display substrate 10 and a 3D camera module, where the 3D camera module includes a depth camera module located on a backlight side of the display substrate 10. It should be noted that the depth camera module in the embodiment of the present invention is an infrared camera module, and the laser module employs an infrared laser that emits infrared laser. The laser module adopts a vertical cavity surface emitting laser array, an edge emitting laser and a semiconductor laser.

The light-emitting side of the display substrate is a side capable of displaying images, and the backlight side is a side incapable of displaying images. That is, the depth camera module in the embodiment of the invention may be located below the display substrate 10, i.e., may be disposed below the screen, without damaging the structure of the display substrate 10, for example, without digging a hole in the non-display area on the top of the display substrate 10 to dispose the depth camera module. The display substrate comprises a display area and a black matrix area surrounding the display area; the black matrix region includes at least two light transmissive regions. The light-transmitting area is a circular area with the diameter smaller than 1 millimeter.

In the embodiment of the present invention, the depth camera module includes a laser module 11 and an imaging module 12. The laser module 11 and the imaging module 12 are both located on the backlight side of the display substrate 10, and the light outlet of the laser module 11 is disposed toward the display substrate 10, so that laser can irradiate onto an object to be photographed, which is located on the light outlet side of the display substrate 10, through a light-transmitting area, and the light inlet of the imaging module 12 is disposed toward the display substrate 10, so that laser reflected by the object to be photographed enters the imaging module 12 through another light-transmitting area.

Wherein the laser module 11 comprises a structured light projector and a projection lens; the projection lens comprises a lens assembly 16 and a first lamp mirror 19; the structured light projector is used for projecting structured light to the lens component, and the structured light comprises a plurality of laser beams which are distributed randomly; the lens assembly 16 is configured to converge the multiple laser beams and then to enter the light incident surface of the first lamp mirror; the first lamp mirror 19 is used for enabling the incident multiple laser beams to be emitted in parallel or approximately emitted in parallel so as to enable the laser beams to irradiate an object to be shot through a light transmission area;

the imaging module 12 is configured to receive the laser reflected by the object to be photographed through another light-transmitting area, and obtain a depth image of the surface of the object to be photographed according to a spot pattern of the received laser reflected by the object to be photographed. The depth image comprises depth information of different areas of the surface of the object to be photographed.

Because the laser module 11 and the imaging module 12 are arranged on the backlight side of the black matrix area, a non-display area is not required to be arranged at the top of the display device to install the depth camera module, and the attractiveness and the overall screen experience of the display device cannot be influenced.

Moreover, since the laser module 11 and the imaging module 12 are both disposed on the backlight side of the display substrate 10, the arrangement and combination of the laser module 11 and the imaging module 12 have multiple possibilities, and the distance between the laser module 11 and the imaging module 12 can be increased on the premise of not affecting the beauty, so as to improve the shooting accuracy of the depth camera module, as shown in fig. 2, the laser module 11 and the imaging module 12 can be disposed in the black matrix areas on both sides, respectively.

Optionally, the light-transmitting region is provided with an infrared film layer;

the first lamp mirror 19 is used for enabling the divergent incident multiple beams of laser to be emitted in parallel or to be emitted nearly in parallel so as to enable the laser to penetrate through an infrared film layer and a light transmission area to irradiate on an object to be shot;

the imaging module 12 is an infrared camera, and is configured to receive the infrared laser reflected by the object to be photographed through another infrared film layer and another light-transmitting area, and obtain a depth image of the surface of the object to be photographed according to the infrared laser.

Optionally, as shown in fig. 3, 6, 10, the laser module includes a beam splitting device between the structured light projector and the projection lens;

the structured light projector adopts a laser array 1101 for projecting dot matrix laser;

the light splitting device 13 is located on the light emitting side of the laser array 1101, and is configured to split the lattice laser emitted by the structured light projector into a plurality of randomly distributed laser beams.

That is, in the embodiment of the present invention, the display substrate 10 may be a glass substrate, and the inner screen 40 of the display device is located inside the display substrate 10.

In the embodiment of the present invention, as shown in fig. 8 and 9, the depth camera module includes a driving circuit 14 connected to the laser module 11 and the imaging module 12. The driving circuit 14 is configured to control the laser module 11 and the imaging module 12 to be turned on or off simultaneously, and control the output optical power of the laser module 11 by controlling the driving current of the laser module 11, so as to control the optical power of the laser passing through a light-transmitting area by controlling the output optical power of the laser module 11.

Further, the depth camera module further comprises a processing module 15, and the 3D camera module further comprises a 2D imaging module. The 2D imaging module is used for shooting a 2D image of an object to be shot. The processing module 15 is used for obtaining a 3D image of the object to be shot according to the depth image shot by the 3D camera module and the 2D image shot by the 2D imaging module.

It should be noted that, in order to set the depth camera module on the backlight side of the display substrate 10, the driving circuit 14 may increase the driving current, reduce the pulse width of the laser module 11, and substantially increase the optical power of the laser module 11, while keeping the total pulse energy of the laser module 11 unchanged, thereby satisfying the optical power limitation of human eye safety.

In one embodiment of the present invention, as shown in fig. 4, 7, 11, the structured light projector includes an edge-emitting laser 1102 located between the laser module and the projection lens, a collimating lens 18, a reflecting device 17, and a light splitting device 13; a collimating lens 18 and a reflecting device 17 are arranged between the light splitting device 13 and the laser module 11;

the edge-emitting laser 1102 is configured to project laser light to the collimating lens;

the collimating lens 18 is located on the light exit side of the edge-emitting laser 1102, and is configured to collimate the incident laser and emit a collimated light beam;

the reflecting device 17 is located on the light-emitting side of the collimating lens 18, and is configured to fold the collimated light beam and project the collimated light beam to the light splitting device 13;

the light splitting device 13 is located on the light emitting side of the reflecting device 17, and is configured to split the collimated light beam projected by the reflecting device 17 into multiple laser beams distributed randomly.

Specifically, the light splitting device 13 divides the laser light emitted by the edge-emitting laser 1102 into a plurality of laser light which are randomly distributed, and when the laser light is irradiated on a plane, a light spot image as shown in fig. 14 is formed, when the plurality of laser light is irradiated on an object to be photographed, the light spot pattern is deformed or displaced, and after the first imaging module photographs the light spot pattern on the surface of the object to be photographed, a depth image of the surface of the object to be photographed is obtained according to the deformation or displacement of the light spot pattern, that is, the depth information of the surface of the object to be photographed is obtained. The processing module 15 can obtain a 3D image of the object to be photographed according to the depth image and the 2D image.

In the embodiment of the present invention, the reflecting device 17 may adopt a mirror or a triangular prism. The reflecting surface of the triangular prism can be plated with a layer of reflecting film.

The imaging module 12 is a first imaging module, and optionally, the first imaging module is an infrared camera. The first imaging module 12 obtains a depth image of the surface of the object to be photographed according to the received spot pattern of the laser reflected by the object to be photographed.

In the embodiment of the present invention, as shown in fig. 5, 6, and 7, the imaging module 12 includes a second lamp lens 1201, a receiving lens 1202, and a photo detector array 1203; the photo detector array 1203 comprises a plurality of photo detectors distributed in an array;

the second light mirror 1201 is used for receiving the laser reflected by the object to be shot through another light transmission area, and after the laser is contracted to the narrowest position at the diaphragm, the laser is divergently projected to the receiving lens;

the receiving lens 1202 is configured to converge parallel laser beams incident at the same angle on an upper optical detector located on a focal plane of the receiving lens;

the optical detector is used for receiving the laser to generate a light spot pattern and obtaining a depth image of the surface of the object to be shot according to the light spot pattern.

In the embodiment of the invention, the light detector can adopt a CMOS or CCD sensor.

Fig. 12 is a schematic structural diagram of a projection lens according to an embodiment of the present invention, and fig. 13 is another schematic structural diagram of a projection lens according to an embodiment of the present invention, as shown in fig. 12 and 13, the projection lens includes a lens assembly 16 and a first lamp lens 19; the structured light projector is used for projecting structured light to the projection lens, and the structured light comprises a plurality of beams of laser light which are distributed randomly; the lens assembly 16 is configured to converge the multiple laser beams and then enter the light incident surface of the first lamp mirror 19; the first lamp mirror 19 is used for enabling the incident multiple laser beams to be emitted in parallel or approximately emitted in parallel so as to enable the laser beams to irradiate an object to be shot through a light transmission area;

in the embodiment of the present invention, the angle between the two nearly parallel laser beams is smaller than a preset angle threshold, and the angle threshold may be set to 5 °. The multiple laser parallel is characterized in that multiple lasers form multiple groups of lasers, and the multiple lasers in each group of lasers are mutually parallel.

In the embodiment of the present invention, the lens assembly 16 includes a first lens 1601, a second lens 1602, and a lens barrel 1604; the first lens 1601 and the second lens 1602 are arranged on the light incident side of the lens barrel; the first lamp mirror 19 is arranged on the light-emitting side of the lens barrel; the first lens 1601 is configured to converge the plurality of laser beams and project the converged laser beams to the second lens; the second lens 1602 is configured to converge the multiple laser beams projected by the first lens again and project the laser beams to the light incident surface of the first lamp mirror. The lens barrel 1604 is used for integrally assembling and fixing the first lens 1601, the second lens 1602, and the first lamp lens 19. A concave light inlet is arranged on the light inlet side of the first lamp mirror 19; the bottom surface of the light inlet is a light inlet surface; the light incident surface is a convex surface; and the diaphragm of the projection lens is arranged on the convex surface. The light incident surface is used for enabling the incident multiple beams of laser to be emitted in parallel or to be emitted approximately in parallel so as to form an image at a specified distance from infinity or a distance.

In the embodiment of the invention, because the depth camera module is arranged under the narrow gap for emitting light, the position of the diaphragm, namely the position of the narrowest light beam, is the position in the middle of the height of the narrow gap, the lens can reach the largest angle of field under the condition that the upper side and the lower side can not shield the light.

When the projection lens is located on the backlight side of the display substrate 10, a first lamp mirror 19 needs to be filled between the lens assembly 16 and the display substrate 10. Since the area available for light transmission is smaller in size, the convergence point of the light of the projection lens, i.e., the diaphragm, needs to be placed at the position of the first lamp mirror 19, and then the diameter of the projection lens needs to be larger, so that the emergent light with a certain angle can be converged at a designated position after being transmitted for a certain distance. The lower surface of the first lamp mirror 19 is made into a convex surface, and the diaphragm of the projection lens is placed on the convex surface, so that the first lamp mirror 19 can bear part of focal power, which is equivalent to a convex lens, the angle of emergent light rays from the lens below the first lamp mirror 19 is reduced, the effective caliber of the projection lens can be reduced, and the size of the whole system is reduced.

In the embodiment of the present invention, the upper surface of the first lamp lens 19 is tightly attached to the lower surface of the display substrate 10, the boss structure on the upper portion of the first lamp lens 19 is tightly attached to the lower surface of the inner screen 40, and the lower edge of the first lamp lens 19 is tightly attached to the projection lens barrel, which is convenient for assembly and testing.

A spacer is disposed between the first lens 1601 and the second lens 1602, and the spacer 1603 is used to fix the relative position between the first lens 2 and the second lens 4.

In the embodiment of the invention, a boss structure is arranged on the light emergent side of the first lamp mirror; the end face of the boss structure is a light-emitting face. The first lens 1601 and the second lens 1602 are convex lenses. The light incident side surface of the first lamp mirror 19 is attached to the second lens 1602. The first lamp lens 19 is made of optical plastic materials, and can not only realize the function of bearing focal power, but also realize the dustproof function between the projection lens and the display substrate 10.

In the modified example of the present invention, the lens barrel 1604 is provided with a bulkhead 1605; the second lens 1602 is disposed on one side of the bezel 1605, and the lens barrel 1604 is disposed on the other side of the bezel 1605.

In the embodiment of the present invention, the light incident from the first lens 1601 may be projected by any light projector, such as a structured light projector, an edge emitting laser, to project a pattern. The structured light emitted by the light projector can be a plurality of parallel telecentric light beams or light beams with main rays having certain angles.

In the embodiment of the present invention, the light splitter 13 may be a waveguide device, a nano-photonic chip, or a diffraction grating (DOE) or a photomask with a code structure, and the present invention is not limited thereto.

The embodiment of the invention also provides electronic equipment, which comprises the display device provided by any one of the embodiments, and the electronic equipment can be a mobile phone, a tablet computer, a digital camera and the like. According to the electronic equipment with the 3D camera module, the depth camera module is installed without arranging a non-display area on the top of the display device, so that the appearance is more attractive, and the full-screen experience is more favorably realized.

In the embodiment of the invention, light rays are converged on the first lamp lens through the first lens and the second lens of the lens component, and the diaphragm is positioned on the light incident surface of the first lamp lens, so that the depth camera module with the projection lens is suitable for being installed in a narrow gap without being shielded by an FOV (field of view), thus the application of the invention on a narrow-frame screen (a narrow screen with a black matrix area) is realized, and the first lamp lens can be tightly attached to a mobile phone glass cover plate to play a dustproof role; according to the display device and the electronic equipment with the 3D camera module, which are provided by the embodiment of the invention, the depth camera module is arranged on the backlight side of the black matrix area of the display substrate, so that a non-display area, namely a sea area, does not need to be arranged at the top of the display device for installing the depth camera module, and the attractiveness and the comprehensive screen experience of the display device cannot be influenced; according to the embodiment of the invention, the infrared film layer is arranged in the light-transmitting area of the black matrix area, the infrared film layer can transmit infrared light so as not to influence the work of the depth camera module, but visible light cannot pass through the infrared film layer, so that the integrity of the black matrix area is ensured, and the attractiveness of a display screen is not influenced.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.

Claims (10)

1. A projection lens is characterized by comprising a first lens, a second lens, a lamp mirror and a lens cone;

the first lens and the second lens are arranged on the light inlet side of the lens barrel; the lamp mirror is arranged on the light-emitting side of the lens barrel;

the first lens is used for converging a plurality of laser beams projected by the light source and projecting the laser beams to the second lens;

the second lens is used for converging the laser beams projected by the first lens again and projecting the laser beams to the light incident surface of the lamp mirror;

the lamp mirror is used for projecting the incident multiple laser beams.

2. The projection lens of claim 1 wherein the light entrance side of the lamp mirror is provided with a concave light entrance;

the bottom surface of the light inlet is a light inlet surface; the light incident surface is a convex surface; the diaphragm of the second lens is arranged on the convex surface;

the light incident surface is used for enabling the incident multiple beams of laser to be emitted in parallel or to be emitted approximately in parallel.

3. The projection lens of claim 1, wherein a spacer is disposed between the first lens and the second lens.

4. The projection lens of claim 1, wherein the light exit side of the lamp mirror is provided with a boss structure;

the end face of the boss structure is a light emergent face.

5. The projection lens of claim 1, wherein the first lens and the second lens are convex lenses.

6. The projection lens of claim 1 wherein the light incident side of the lamp mirror is attached to the second lens.

7. The projection lens according to claim 3, wherein the lens barrel is provided with a bulkhead;

the second lens is arranged on one side face of the partition frame, and the lens barrel is arranged on the other side face of the partition frame.

8. The projection lens of claim 3 wherein the lamp mirror is made of an optical plastic material.

9. A light projector comprising the projection lens of any one of claims 1 to 8 and further comprising a structured light projector;

the structured light projector is used for projecting structured light to the projection lens, and the structured light comprises a plurality of beams of laser light which are distributed randomly;

the projection lens is used for converging the multiple laser beams and then enabling the multiple laser beams to enter the light inlet surface of the lamp mirror, and then enabling the multiple laser beams to enter the lamp mirror to be emitted in parallel or to be emitted in an approximately parallel mode through the lamp mirror.

10. A depth camera module comprising the light projector of claim 9, and further comprising an imaging module;

the light projector is used for enabling the incident multiple laser beams to be emitted in parallel or to be emitted nearly in parallel through the lamp mirror so as to enable the laser beams to irradiate on an object to be shot;

the imaging module is used for receiving the laser reflected by the object to be shot through the other light-transmitting area and obtaining a depth image of the surface of the object to be shot according to the received spot pattern of the laser reflected by the object to be shot.

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