CN216930133U

CN216930133U - Miniaturized TOF module for face recognition

Info

Publication number: CN216930133U
Application number: CN202220089736.0U
Authority: CN
Inventors: 易康; 李坚; 卢庆德
Original assignee: Shine Optics Technology Company Ltd
Current assignee: Shine Optics Technology Company Ltd
Priority date: 2022-01-13
Filing date: 2022-01-13
Publication date: 2022-07-08
Anticipated expiration: 2032-01-13

Abstract

The utility model relates to the technical field of TOF modules, and discloses a miniaturized TOF module for face recognition, which comprises a prism, a laser emitter, a lens and a PCB (printed circuit board); the prism and the lens are arranged on the PCB, the lens is arranged on one side of the prism, and the laser transmitter is arranged on the other side of the prism; the light emitting port of the laser emitter is aligned to the light inlet surface of the prism, and the light outlet surface of the prism is parallel to the lens. The TOF module provided by the utility model has the advantages that the whole module is small in size, strong in adaptability to a terminal, small in size, convenient for arrangement of a heat dissipation structure and good in heat dissipation performance.

Description

Miniaturized TOF module for face recognition

Technical Field

The utility model relates to the technical field of TOF modules, in particular to a miniaturized TOF module for face recognition.

Background

TOF technology is mainly generated for realizing 3D imaging, and the TOF technology increases depth information of a Z axis on the basis of a conventional X, Y two-dimensional mobile phone photographing technology. Compared with a structured light scheme which is also generated for realizing 3D imaging, the 3D scheme of the TOF is simpler to realize, mainly comprises a projector and a receiving module, the projector is controlled to emit modulated near-infrared light waves, the modulated near-infrared light waves are reflected after meeting an object, and the receiving module calculates the time difference or phase difference between the emitted light waves and the received light waves and converts the time difference or phase difference into the distance of a shot scenery to acquire depth information. The 3D scheme of the TOF can simultaneously obtain a gray image and a distance image, and is widely applied to the fields of face recognition, somatosensory control, behavior analysis, artificial intelligence, machine vision, automatic 3D modeling and the like.

Inside many types of cell-phones also began to make a video recording the module with TOF and replaced the structured light scheme in the past, relied on TOF to make a video recording the module and realize functions such as face identification, mobile payment for it. Correspondingly, the design of the camera module tends to be miniaturized due to the development trend of the current smart phone and the like of being light, thin and comprehensive in screen. However, the size of the conventional TOF camera module cannot meet such a miniaturization trend, and application thereof is hindered to some extent. Simultaneously, current TOF makes a video recording the heat dispersion of module relatively poor, and the projecting apparatus in the TOF module of making a video recording, if the high light power that then can influence the projecting apparatus of high temperature, or influence the life of TOF module of making a video recording, the reliability of module is not enough.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a miniaturized TOF module for face recognition, which has the advantages of small overall module volume, strong adaptability to a terminal, overall miniaturization of the module, convenience in arrangement of a heat dissipation structure and good heat dissipation performance.

The basic scheme provided by the utility model is as follows: a miniaturized TOF module for face recognition comprises a prism, a laser emitter, a lens and a PCB; the prism and the lens are arranged on the PCB, the lens is arranged on one side of the prism, and the laser transmitter is arranged on the other side of the prism; the light emitting port of the laser emitter is aligned to the light inlet surface of the prism, and the light outlet surface of the prism is parallel to the lens.

The working principle and the advantages of the utility model are as follows: through setting up the prism, utilized the prism to the refraction characteristic of light, changed the transmission path of the laser that is sent by laser emitter, laser emitter's laser emission direction aims at the light face that advances of prism, and the image sensor department is reachd after the prism refraction to laser, and then is received the sensing by the module. Set up like this, compare in conventional TOF module, laser emitter's mounted position has changed, no longer locate on the PCB board, correspondingly, need not to reserve laser emitter's installation space on the PCB board again, the area of PCB board can effectively reduce, and simultaneously, though laser emitter's mounted position has been changed, the prism still can guarantee that laser can reach effectual sensing position, when guaranteeing that whole module function is effectual, through the reduction of PCB board size, and then effectively reduced the volume of whole TOF module.

The PCB is characterized by further comprising a bracket, wherein the bracket is arranged on the PCB; the prism is arranged on the support.

Adopt the support fixed prism, set up like this, can guarantee that the mounted position of prism is stable, guarantee that the laser that laser emitter sent can be refracted to the correct position.

Further, the device also comprises a flexible circuit board; the flexible circuit board is connected with the PCB, and the laser emitter is arranged on the flexible circuit board.

The flexible circuit board can be freely bent, wound and folded, the structure of the flexible circuit board can be randomly arranged according to the space layout requirement, and the flexible circuit board is adopted to fix the laser emitter, so that the position of the laser emitter can be conveniently adjusted. And the flexible circuit board has good heat dissipation performance, can conduct heat well, and avoids the laser emitter from being overheated to influence the service life thereof.

Further, the device also comprises a microscope base; the lens base is arranged on the PCB, the lens is arranged on the lens base, and the lens base is used for fixing the lens.

Set up like this, the camera lens installation is firm, and the whole module structure steadiness is better.

Further, the prism is a right-angle prism.

By adopting the right-angle prism, compared with an equilateral prism, a pentagonal prism and the like, the structure of the right-angle prism is more regular and is convenient to install and fix.

Further, the bracket comprises a mounting inclined plane; the installation inclined plane is attached to the inclined plane of the right-angle prism, and the slope of the installation inclined plane is the same as that of the inclined plane of the right-angle prism.

Set up like this, right angle prism can perfect adaptation with the support, and the support is more reliable with the cooperation of prism.

Further, the flexible circuit board comprises a bottom plate part and a connecting part, and the laser emitter is arranged on the bottom plate part; the bottom plate portion is attached to the terminal housing surface.

Set up like this, the heat accessible bottom plate portion that produces when laser emitter operates conducts to terminal shell face, and then reaches the radiating effect, need not additionally add the heating panel, subassembly such as heat dissipation silica gel pad, rely on self structure to arrange and can reach the radiating effect, the radiating mode is simple and convenient, and laser emitter's timely heat dissipation helps saving laser emitter's energy loss, reach the power saving effect, help guaranteeing laser emitter's job stabilization nature simultaneously.

Furthermore, the connecting part is connected with the PCB and is positioned on the same horizontal line, and the connecting part of the bottom plate part and the connecting part is bent by 90 degrees.

Set up like this, the contained angle that bottom plate portion and PCB board formed is 90 degrees, and the laser emitter of locating on the bottom plate portion also is 90 degrees settings with the PCB board, and laser can jet into the light face that advances of prism perpendicularly, and the incident path of light is more regular, and the refraction angle of laser is the timing of being more convenient for.

Drawings

Fig. 1 is a front view of a structure of a miniaturized TOF module for face recognition according to an embodiment of the present invention.

FIG. 2 is a structural isometric view of an embodiment of a miniaturized TOF module for face recognition according to the present invention.

Detailed Description

The following is further detailed by the specific embodiments:

the reference numbers in the drawings of the specification include: prism 1, support 2, camera lens 3, microscope base 4, PCB board 5, laser emitter 6, flexible circuit board 7, bottom plate portion 71, connecting portion 72.

The embodiment is basically as shown in the attached figures 1 and 2: a miniaturized TOF module for face recognition comprises a prism 1, a bracket 2, a laser emitter 6, a flexible circuit board 7, a lens 3, a lens base 4 and a PCB 5; the prism 1 and the lens 3 are both arranged on the PCB 5, the lens 3 is arranged on one side of the prism 1, and the laser transmitter 6 is arranged on the other side of the prism 1; in this embodiment, the lens 3 is disposed on the right side of the prism 1, and the laser emitter 6 is disposed on the left side of the prism 1, opposite to the lens 3. The light emitting port of the laser emitter 6 is aligned with the light inlet surface of the prism 1, and the light outlet surface of the prism 1 is parallel to the lens 3.

Specifically, the bracket 2 can be fixedly mounted on the PCB 5 by welding; the prism 1 is fixedly mounted on the support 2. The prism 1 is a right angle prism. The bracket 2 comprises a mounting inclined plane; the installation inclined plane is attached to the inclined plane of the right-angle prism, and the slope of the installation inclined plane is the same as that of the inclined plane of the right-angle prism. In this embodiment, the cross-section of support 2 is right trapezoid, and right trapezoid's hypotenuse corresponds right angle prism's hypotenuse, can with right angle prism better adaptation. The microscope base 4 is installed on the PCB 5, the lens 3 is installed on the microscope base 4, and the microscope base 4 is used for fixing the lens 3.

The flexible circuit board 7 and the PCB 5 are fixedly connected together in a welding mode, and the laser emitter 6 is arranged on the flexible circuit board 7. Specifically, the flexible circuit board 7 includes a bottom plate portion 71 and a connecting portion 72, and the laser emitter 6 is fixedly mounted on the bottom plate portion 71; the bottom plate portion 71 is attached to the terminal housing surface. Connecting portion 72 links to each other and is in same water flat line with PCB board 5, and bottom plate portion 71 is 90 degrees settings of buckling with the junction of connecting portion 72, and laser emitter 6 of locating on bottom plate portion 71 also is 90 degrees settings with PCB board 5, and the laser that laser emitter 6 sent can inject into prism 1 perpendicularly and advance the light face, through the refraction back of prism 1, and effectual sensing position can be reachd to laser, and then is received the sensing by the module.

In addition, the laser emitter 6, the lens 3, the lens holder 4, and the like used in the present embodiment are all conventional devices commercially available.

According to the miniaturized TOF module for face recognition, the laser emitter 6 is not arranged on the PCB 5, but is fixed on the direction perpendicular to the PCB 5 through the flexible circuit board 7, and the prism 1 is arranged on the PCB 5 to refract laser emitted by the laser emitter 6, so that the final projection position of the laser is guaranteed to be accurate. This scheme is through the mounted position who changes laser emitter 6, can effectively reduce PCB board 5's size, simultaneously, what laser emitter 6 after the change utilized is that the height space that does not have the hindrance and vacate for guaranteeing the light transmission in the conventional module, this scheme sets up like this for module structure arranges more compactly, space utilization is higher, whole module volume is less, correspondingly, when cooperating with the terminal, the space that needs the terminal reservation is less, stronger with the adaptability at terminal.

And, the structure of this scheme itself can reach certain radiating effect, bottom plate portion 71 and the laminating of terminal shell face of flexible circuit board 7 in this scheme, the heat accessible bottom plate portion 71 that laser emitter 6 during operation produced conducts to terminal shell face department and then dissipates, can reach the radiating effect through simple structure setting, and, laser emitter 6 dispels the heat in this scheme in time, help prolonging laser emitter 6's life, guarantee its working property, and can reduce laser emitter 6's energy loss, reach certain power saving effect.

The foregoing are merely exemplary embodiments of the present invention, and no single details of the structure, or characteristics thereof, known to the skilled person is hereby incorporated by reference, and it should be appreciated that these statements are made only by those skilled in the art, which read this disclosure as including the general knowledge of the art as presently claimed in the claims and their equivalents, and that these statements are to be read in this light of the teaching of the present application and the equivalents thereof. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.

Claims

1. A miniaturized TOF module for face recognition is characterized by comprising a prism, a laser transmitter, a lens and a PCB; the prism and the lens are arranged on the PCB, the lens is arranged on one side of the prism, and the laser transmitter is arranged on the other side of the prism; the light emitting port of the laser emitter is aligned to the light inlet surface of the prism, and the light outlet surface of the prism is parallel to the lens.

2. The miniaturized TOF module for human face recognition according to claim 1, further comprising a bracket disposed on the PCB; the prism is arranged on the support.

3. The miniaturized TOF module for human face recognition according to claim 1, further comprising a flexible circuit board; the flexible circuit board is connected with the PCB, and the laser emitter is arranged on the flexible circuit board.

4. The miniaturized TOF module for human face recognition according to claim 1, further comprising a lens holder; the lens base is arranged on the PCB, the lens is arranged on the lens base, and the lens base is used for fixing the lens.

5. The miniaturized TOF module for human face recognition according to claim 2, wherein the prism is a right-angle prism.

6. The miniaturized TOF module for human face recognition according to claim 5 wherein said frame includes a mounting ramp; the installation inclined plane is attached to the inclined plane of the right-angle prism, and the slope of the installation inclined plane is the same as that of the inclined plane of the right-angle prism.

7. The miniaturized TOF module for human face recognition according to claim 3, wherein the flexible circuit board comprises a bottom plate portion and a connecting portion, and the laser emitter is arranged on the bottom plate portion; the bottom plate portion is attached to the terminal housing surface.

8. The miniaturized TOF module for human face recognition according to claim 7, wherein the connecting part is connected with the PCB and located on the same horizontal line, and the joint of the bottom plate part and the connecting part is bent by 90 degrees.