CN111626077A

CN111626077A - Biological identification module, mobile terminal and electronic device

Info

Publication number: CN111626077A
Application number: CN201910146500.9A
Authority: CN
Inventors: 邹海荣; 王丽青; 吴俊甫
Original assignee: OFilm Tech Co Ltd
Current assignee: OFilm Group Co Ltd
Priority date: 2019-02-27
Filing date: 2019-02-27
Publication date: 2020-09-04

Abstract

The invention relates to a biological identification module, a mobile terminal and an electronic device. The biological identification module is including being used for with the face that awaits measuring of finger or palm direct contact, the biological identification module still includes: the biological identification module comprises a plurality of mutually independent lenses, wherein each lens corresponds to an acquisition area on a surface to be detected of the biological identification module; the photosensitive chip is arranged on the image side of the plurality of lenses; light carrying skin texture information on the acquisition regions passes through the lens and then reaches the photosensitive chip, and two adjacent acquisition regions are overlapped to form an overlapping region. Through setting up a plurality of mutually independent camera lenses, the biological identification module possesses bigger collection area (the measured object area that can discern) to can obtain the information (the line information of skin) of more measured objects, with this identification ability that increases the biological identification module. Meanwhile, the existence of the overlapping area can improve the identification accuracy of the biological identification module.

Description

Biological identification module, mobile terminal and electronic device

Technical Field

The present invention relates to the field of biometric identification, and in particular, to a biometric identification module, a mobile terminal and an electronic device.

Background

In recent years, with the popularization of smart phones, identification functions such as fingerprints and palm prints have become basic configurations of the mobile phones. And along with the development of full-face screen, the discernment module is because of can placing in the screen and become the research hotspot, and biological identification module includes sensitization chip usually and sets up the camera lens on sensitization chip's sensitization route. The traditional identification module has the problems of limited identification range and low identification accuracy caused by small acquisition area, and cannot meet the requirements of high-end products.

Disclosure of Invention

Therefore, it is necessary to provide a biometric identification module, a mobile terminal and an electronic device for solving the problems of small acquisition area and low identification accuracy.

The utility model provides a biological identification module, is including being used for the face that awaits measuring with the measured object direct contact, biological identification module includes:

the biological identification module comprises a plurality of mutually independent lenses, wherein each lens corresponds to an acquisition area on a surface to be detected of the biological identification module;

the photosensitive chip is arranged on the image side of the plurality of lenses;

the light carrying the skin texture information on the acquisition area passes through the lens and then reaches the photosensitive chip, and the acquisition areas are overlapped to form a multi-order overlapping area.

Firstly, through setting up a plurality of mutually independent the camera lens, the biological identification module possesses bigger collection area (the measured object area that can discern) to can obtain the information (the line information of skin) of more measured objects, with this increase the identifiability of biological identification module.

And when adjacent when there is overlap in the collection region, the biological identification module can receive the light that carries large tracts of land and continuous skin line information to promote identification efficiency.

Secondly, since the general lens has problems of curvature of field, high relative illumination of off-axis field, and unbalanced chromatic aberration of off-axis field, the lens generally has an imaging region with high definition and an imaging region with low definition (for example, the marginal field is not clear, but the marginal field is clear). Because the light carrying the skin texture information on the overlapping area passes through different lenses and is imaged on the photosensitive chip, at the moment, the light of one subregion of the overlapping area has imaging with lower definition in one lens, and the light of the other subregion of the overlapping area has imaging with higher definition in the other lens, so that the imaging with higher definition of the subregion can be selected for identification and analysis or a plurality of imaging can be processed by adopting an image synthesis algorithm during analysis and processing, and the identification accuracy of the biological identification module is improved based on the analysis and processing result.

In addition, when dust exists on the photosensitive chip or part of pixels are damaged, the imaging of the light rays on one lens in the overlapping area can not be received, and at the moment, the other lens capable of receiving the light rays in the overlapping area can also obtain corresponding imaging, so that the loss of information is avoided, and the identification performance is improved.

In one embodiment, in two adjacent acquisition regions, the center of one acquisition region is at the edge of the other acquisition region. At this time, the acquisition area in the biometric module and the area of the overlapping region are balanced, and the biometric module has a larger acquisition area and a larger area of the overlapping region, so that the identification performance is improved. Meanwhile, because the relation between the acquisition regions can correspond to the lenses, the distance between the lenses can be reduced while the biological recognition module has high recognition performance, so that the size of the biological recognition module is reduced.

In one embodiment, the centers of the plurality of acquisition regions are distributed in a straight line or a polygon. The symmetric distribution of the acquisition regions can enable the biological identification module to uniformly and intensively acquire skin texture information.

In one embodiment, the optical axes of a plurality of the lenses are parallel to each other or intersect at a point. The structure that the optical axes are parallel to each other can reduce the difficulty of module manufacturing process. For the structure that the optical axis intersects with one point, when the intersection point is positioned on one side of the measured object, the biological identification module has a larger area of the overlapping area, so that the identification accuracy is improved; when the intersection point of the optical axis is positioned on one side of the photosensitive chip, the biological identification module has a larger acquisition area.

In one embodiment, a plurality of lenses and the photosensitive chip are arranged between the lenses and the photosensitive chip, and the lenses and the photosensitive chip are spaced by the gap layer. The setting on clearance layer can make biological identification module possesses the ability of holding other components, promotes the flexibility of design, simultaneously, also can prevent photosensitive chip with independent the camera lens contact prevents to bump. In addition, the space layer can also be used as a heat dissipation space of the photosensitive chip and a back focal distance space between the lens and the photosensitive element.

In one embodiment, the number of the photosensitive chips is one.

Compared with the arrangement of a plurality of photosensitive chips, when the biological identification module is provided with one photosensitive chip, the electric connection between the photosensitive chip and the circuit board can be reduced, and the complexity of the manufacturing process is reduced. In addition, for the structure provided with one photosensitive chip, because the images of the skin texture information on the adjacent acquisition regions on the same photosensitive chip have uniform directional characteristics, and the photosensitive chip has independent pixel array coordinates (x, y), at the moment, the images of different regions on the photosensitive chip can be analyzed and processed according to the uniform array coordinates, for example, the images of different regions can be translated by matching the images of different regions during analysis and the images of different regions can be spliced into relatively complete skin texture patterns by matching the information of the overlapping regions, so that efficient identification is realized. For a general module having a plurality of lenses, each lens corresponds to a photosensitive chip, skin texture information in the modules is imaged on each photosensitive chip in a scattered manner, and during analysis, images in different array coordinates (x, y) need to be spliced and superposed (a more complex algorithm needs to be adopted to convert the images in different coordinates into images in a uniform coordinate) to obtain a relation between the images, so that the recognition efficiency is reduced; meanwhile, there is a high requirement for the arrangement of the photosensitive chips, for example, the directions of the photosensitive chips need to be unified to unify the directions of the x/y coordinates of the pixel arrays, which increases the complexity of the manufacturing process.

In one embodiment, the photosensitive chip includes a plurality of mutually independent photosensitive areas, and each photosensitive area corresponds to one of the lenses. In this case, the photosensitive element may be provided only on the photosensitive region, thereby reducing costs.

In one embodiment, the biometric module further includes a lens holder, the lens holder includes a first end surface and a second end surface opposite to the first end surface, the first end surface is provided with a receiving groove, the second end surface is provided with a plurality of mounting holes, the mounting holes are all communicated with the receiving groove, the lenses are respectively disposed in the mounting holes, and the photosensitive chip is disposed in the receiving groove. The lens base can compactly fix the photosensitive chip and the lens, so that the size of the biological identification module is reduced.

In one embodiment, the biological identification module further comprises a circuit board, the photosensitive chip is arranged on the circuit board and electrically connected with the circuit board, and the first end surface is directly arranged on the circuit board; and

the biological identification module further comprises an optical filter, and the optical filter is arranged on the surface, far away from the circuit board, of the photosensitive chip. At this time, the biological recognition module can save a general structure of supporting the optical filter by adopting a bracket, thereby achieving the effect of reducing the thickness.

A mobile terminal, comprising:

a cover plate; and

the biometric identification module of any preceding embodiment, the biometric identification module is located one side of the apron, wherein, the face that awaits measuring is located the apron is kept away from one side of biometric identification module.

In one embodiment, the mobile terminal further comprises a display module, the cover plate is arranged on one side of a light emitting surface of the display module, and the biological identification module is arranged on one side of the display module, which is far away from the cover plate; wherein

In the direction perpendicular to apron, the projection of display module assembly covers the projection of biological identification module assembly, or the projection of display module assembly with the projection of biological identification module assembly is independent each other. When the projection of the display module covers the projection of the biological identification module, the screen occupation ratio of the mobile terminal can be increased; when the projection of display module assembly with when the projection of biological identification module assembly is independent each other, the multiplicable entering biological identification module assembly's light intensity avoids light by the display module assembly shelters from.

An electronic device comprising the biometric module according to any of the above embodiments.

Drawings

Fig. 1 is a schematic view of a biometric module and a cover plate according to an embodiment of the present disclosure;

FIG. 2 is a cross-sectional view of the biometric identification module and the cover plate shown in FIG. 1 taken along the A-A direction;

FIG. 3 is a schematic view of the biometric module shown in FIG. 1 in a collection area of the cover plate;

FIG. 4 is an internal view of the biometric module shown in FIG. 1;

fig. 5 is a schematic view of a biometric module and a cover plate according to another embodiment of the present disclosure;

FIG. 6 is a cross-sectional view of the biometric identification module and the cover plate shown in FIG. 5 taken along the A-A direction;

FIG. 7 is a cross-sectional view of the biometric identification module and the cover plate shown in FIG. 5 taken along the direction B-B;

FIG. 8 is a schematic view of the biometric module shown in FIG. 5 in a collection area of the cover plate;

FIG. 9 is an internal view of the biometric module shown in FIG. 5;

fig. 10 is a schematic view of a biometric module and a cover plate according to another embodiment of the present disclosure;

FIG. 11 is a cross-sectional view of the biometric identification module and the cover plate shown in FIG. 10 taken along the A-A direction;

FIG. 12 is a schematic view of the biometric module shown in FIG. 10 in a collection area of the cover plate;

FIG. 13 is an internal view of the biometric module shown in FIG. 10;

fig. 14 is a schematic view of a biometric module and a cover plate according to another embodiment of the present disclosure;

FIG. 15 is a cross-sectional view of the biometric identification module and the cover plate shown in FIG. 14 taken along the A-A direction;

FIG. 16 is a schematic view of the biometric module shown in FIG. 14 in a collection area of the cover plate;

FIG. 17 is an internal view of the biometric module shown in FIG. 14;

fig. 18 is a schematic view of a biometric module according to another embodiment of the present application;

fig. 19 is a diagram of a mobile terminal according to an embodiment of the present application;

fig. 20 is a cross-sectional view of a mobile terminal provided in an embodiment of the present application;

fig. 21 is a cross-sectional view of a mobile terminal provided in another embodiment of the present application;

fig. 22 is a schematic view of an electronic device according to an embodiment of the present application.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1 and 2, in the biometric module 10 according to an embodiment of the present invention, the biometric module 10 can be used to identify a detected object (such as a skin texture like a fingerprint or a palm print), so as to achieve functions of screen unlocking, mobile payment, security monitoring, and the like.

In some embodiments, the biometric module 10 can be applied to electronic products such as smart phones, tablet computers, handheld game consoles, fingerprint locks, fingerprint attendance machines, and the like. Specifically, the biometric module 10 is disposed under a cover plate 40 of the electronic product, and a side of the cover plate 40 away from the biometric module 10 is used for a user to view video and/or touch.

Referring to fig. 2 and 3, the biometric module 10 includes a plurality of mutually independent lenses 11 (at least two lenses) and a photosensitive chip 12 located on the image side of the lenses 11. Wherein, each lens 11 is provided with at least one independent lens, and the lens 11 can generate the effect of converging light. The structure of the lenses 11 enables the biometric identification module 10 to have a larger acquisition area, so as to obtain more information (skin texture information) of the object to be detected, thereby increasing the identification capability.

The lenses in the lens 11 may be any type of single lens (e.g., bi-convex, meniscus, etc. lens) or any combination of lenses capable of generating a converging light effect. Specifically, in one embodiment, the lens element 11 includes, in order from an object side to an image side, a first lens element with negative refractive power and a second lens element with positive refractive power. In another embodiment, the lens element 11 includes, in order from an object side (a side to be measured) to an image side, a first lens element with negative refractive power, a second lens element with positive refractive power, and a third lens element with positive refractive power.

The independent lens has abundant face type selection and a flexible curvature design of the mirror surface, so that aberration can be effectively corrected, imaging quality is improved, and identification accuracy is improved. When the lens 11 has a plurality of individual lenses, the plurality of individual lenses can be fitted to each other (fitting of surface type, refractive index, radius of curvature) to better correct aberrations and form a lens of short focal length, so that a balance can be achieved between high imaging quality and small thickness.

Referring to fig. 2 and 3, the biometric module 10 includes a surface to be measured 110 for directly contacting with a measured object (finger or palm), each lens 11 corresponds to a collecting area 111 on the surface to be measured 110, and the biometric module 10 can identify the measured object located on the collecting area 111.

In some embodiments, the surface to be measured 110 is located on the surface of the cover plate 40 away from the lens 11, and the biometric identification module 10 can identify the object to be measured contacting the cover plate 40 because the collecting region 111 is located on the surface to be measured 110. Specifically, when the object to be measured is pressed on the collecting region 111 on the cover plate 40 (the surface 110 to be measured), the light carrying the texture information of the object to be measured on the collecting region 111 can reach the biometric module 10 through the cover plate 40, and then is converged on the photosensitive chip 12 by the lens 11 in the biometric module 10, and finally is received by the photosensitive chip 12. In other embodiments, the testing surface 110 may be located above the cover plate 40 (i.e. to the left of the cover plate 40 in fig. 2) and spaced a fixed distance from the cover plate 40. The position of the surface 110 to be measured is selected according to the preferred or optimal imaging object distance of the biometric module 10. Preferably, the best imaging object plane of the biometric module 10 should be the plane to be measured 110, and it should be noted that the distance between the plane to be measured 110 and the lens 11 at this time will depend on the type, parameters, arrangement, etc. of the lenses in the lens 11.

Referring to fig. 2 and 3, in order to improve the identification accuracy, in the embodiment of the present disclosure, the collecting regions 111 corresponding to two adjacent lenses 11 are overlapped to form an overlapping region 1112 by adjusting a distance between the two adjacent lenses 11, a separation distance between the plane to be measured 110 and the lenses 11, and/or an angle of view of the lenses 11. The overlapping area 1112 is located on the surface 110. In some embodiments, when a larger acquisition area is required, the distance between two adjacent lenses 11 may be increased, so that the surface to be measured 110 is away from the lenses 11 and the angle of view of the larger lenses 11 is maintained; in other embodiments, when a larger area of the overlapping region 112 is required, the distance between two adjacent lenses 11 can be shortened, the surface to be measured 110 is far away from the lenses 11, and the field angle of the lenses 11 is kept larger. It should be noted that different combination methods (combinations of different lens pitch sizes, object distance sizes, and field angle sizes) can be adopted for the same requirements, and the specific combination method is determined according to actual requirements of products, and is not limited herein. Preferably, the area of the overlap region 1112 can be made to approach the area of the fingerprint by shortening the distance between the lenses 11 and/or increasing the field angle of the lenses 11, so that the biometric identification module 10 can identify the fingerprint information of the finger only through the overlap region 1112.

Specifically, in the embodiment of the present application, there is an overlap of multiple (at least two) acquisition regions 111 to form a multi-order (at least two-order) overlap region. When the overlap region 1112 is formed by overlapping two acquisition regions 111, the overlap region 1112 is a second-order overlap region; when the overlap region 1112 is formed by overlapping three acquisition regions 111, the overlap region 1112 is a third-order overlap region; when the overlap region 1112 is formed by overlapping four acquisition region regions 111, the overlap region 1112 is a fourth-order overlap region. By analogy, when the overlap region 1112 is formed by overlapping N acquisition regions 111, the overlap region 1112 is an N-order overlap region. It should be noted that, as the overlapping order of an overlapping region 1112 is higher, the measured object texture information on the overlapping region 1112 can be identified more accurately. In addition, when there is an overlap between two adjacent acquisition regions 111, the acquisition regions 111 include an overlapping region 1112 and an independent region 1113 (there is no overlapping portion in the acquisition regions 111), and at this time, the total acquisition region of the biometric identification module 10 is composed of a plurality of overlapping regions 1112 and independent regions 1113. When there is overlap, the area of the total acquisition region will be less than the sum of the areas of the acquisition regions 111.

When there is the overlap area 1112 between adjacent collection region 111, be favorable to forming continuous region between collection region 111, at this moment, biological identification module 10 can receive the light that carries the skin texture information of carrying large tracts of land and continuity to promote identification efficiency.

With reference to fig. 2, it should be noted that, because a general lens has problems of curvature of field of imaging, high relative illumination of the off-axis field, and unbalanced chromatic aberration of the off-axis field, the lens generally has a central field with high definition and a peripheral field with low definition, because the light carrying the skin texture information in the overlap region 1112 passes through different lenses 11 and is imaged on the corresponding photosensitive region 1210 on the photosensitive chip 12 and received, at this time, the light of a sub-region in the overlap region 1112 has an image with low definition in one lens 11, and the sub-region has an image with high definition in another lens 11, at this time, the image with high definition in the sub-region can be selected for identification and analysis during analysis; or, the image with higher definition of the sub-region is spliced with the images with higher definition of other sub-regions to restore the texture information of the high-definition overlap region 1112, and then the identification analysis is performed, so as to improve the identification accuracy of the biometric module 10. In addition, when one of the photosensitive areas 1210 is damaged or contaminated by the light received from one of the overlapping areas 1112, the other photosensitive area 1210 can also receive the light from the overlapping area 1112, thereby preventing the light information on the overlapping area 1112 from being lost, and improving the fault tolerance of the biometric module 10. Thus, the biometric module 10 can accurately and efficiently identify the overlap region 1112 having a high overlap order.

In some embodiments, for an acquisition region 111 having an overlap region 1112, the ratio of the area of the overlap region 1112 to the area of the acquisition region 111 may be 5/6, 2/3, 1/2, 1/3, 1/6, and so on.

Specifically, in some embodiments, for two adjacent acquisition regions 111, the center of one acquisition region 111 is at the edge of the other acquisition region 111. At this time, compared with the structure that the neighboring collection regions 111 are completely overlapped to form the largest overlapping area 1112 and the smallest total collection area, or compared with the structure that the neighboring collection regions 111 only have the edge overlapping to form the smallest overlapping area 1112 and the largest total collection area, the total collection area and the area of the overlapping area 1112 in the biometric identification module 10 having the above relationship are balanced, so that the biometric identification module 10 has a larger collection area and a larger area of the overlapping area 1112, thereby having good identification performance.

In some embodiments, the collection area 111 corresponding to the lens 11 is circular. In other embodiments, the capturing area 111 corresponding to the lens 11 may also be rectangular or elliptical, and the specific shape is determined according to the view angle distribution of the lens 11.

In some embodiments, the centers of the multiple acquisition regions 111 are linearly distributed. In other embodiments, the centers of the plurality of collecting areas 111 may also be distributed in a polygon, such as a triangle, a square, a pentagon, and the like. The symmetrical distribution of the collection regions 111 enables the biometric identification module 10 to collect skin texture information uniformly and concentratedly.

Meanwhile, since the relationship between the capturing regions 111 can correspond to the lenses 11, when the area of the overlapping region 1112 is larger, accordingly, in some embodiments, the distance between the lenses 11 is relatively reduced, so that the biometric module 10 has high recognition performance, and the distance between the lenses 11 can also be reduced, thereby reducing the size of the biometric module 10.

In some other embodiments, the optical axes of the lenses 11 are parallel to each other, thereby reducing the difficulty in manufacturing the module. In other embodiments, the optical axes of the plurality of lenses 11 intersect at a point; when the optical axes of the lenses 11 intersect with one side of the object to be detected, the biometric identification module 10 has a larger area of the overlapping area 1112, so as to improve the identification accuracy; when the optical axes of the lenses 11 intersect with one side of the photosensitive chip 12, the biometric module 10 has a larger capture area.

With continued reference to FIG. 2, in some embodiments, a void layer 1311 is present between the plurality of lenses 11 and the photo-sensing chip 12. The void layer 1311 can space the plurality of lenses 11 from the photosensitive chip 12. The provision of the void layer 1311 enables the biometric module 10 to have the ability to accommodate other components, improves the flexibility of design, and prevents the contact between the photosensitive chip 12 and the lens 11, thereby avoiding collision. The void layer 1311 can also serve as a heat dissipation space for the photosensitive chip 12 and a back focal length space between the lens 11 and the photosensitive element 12.

The photosensitive chip disposed in the biometric module 10 may be a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor), which is not limited in this application.

In some embodiments, the biometric module 10 is provided with a plurality of photosensitive chips 12, the plurality of photosensitive chips 12 respectively correspond to the plurality of lenses 11, and the light rays on each collecting region 111 reach the corresponding photosensitive chip 12 after being converged by the lenses 11 and are received.

Referring to fig. 2 and 4, in other embodiments, the number of the photosensitive chips 12 may be one. In one embodiment, one of the photo-sensing chips 12 includes a plurality of mutually independent photo-sensing regions 1210 and idle regions 1220, the photo-sensing regions 1210 are provided with photo-sensing elements for receiving incident light, the regions outside the photo-sensing regions 1210 are the idle regions 1220, and the photo-sensing elements are not provided in the idle regions 1220, so that the cost can be reduced by reducing the number of the photo-sensing elements. In addition, the plurality of lenses 11 are respectively and correspondingly disposed on the photosensitive paths of the plurality of photosensitive areas 1210, each of the collecting areas 111 respectively corresponds to a different photosensitive area 1210, and the information of the object to be measured on the collecting area 111 can be imaged on the corresponding photosensitive area 1210 and received.

In other embodiments, the photosensitive chip 12 includes a large-sized and unique photosensitive area 1210, and each of the collection areas 111 can correspond to the photosensitive area 1210, that is, the object information on the collection areas 111 can be imaged on the photosensitive area 1210 and received.

When the biometric module 10 receives the imaging information through only one photosensitive chip 12, the electrical connection between the photosensitive chip 12 and the circuit board 14 can be reduced, thereby reducing the complexity of the manufacturing process. In addition, for the structure provided with one photosensitive chip 12, because the images of the skin texture information on the adjacent acquisition regions 111 on the same photosensitive chip 12 have uniform directional characteristics, and the photosensitive chip 12 has independent pixel array coordinates (x, y), at this time, the images of different regions on the photosensitive chip 12 can be analyzed and processed according to the uniform array coordinates, for example, the images of different regions can be translated during the analysis and processed, and the images of different regions can be spliced into relatively complete skin texture patterns for analysis by matching the information of the overlapping region 1112, so as to realize high-efficiency identification. For a general module having a plurality of lenses 11 and each lens 11 corresponding to one photo sensor 12, skin texture information in the modules is imaged on each photo sensor 12 in a scattered manner, which requires to splice and superimpose images in different array coordinates (x, y) during analysis (a more complex algorithm is required to convert the images in different coordinates into images in a uniform coordinate) to obtain a relationship between the images, thereby reducing the recognition efficiency; meanwhile, there is a high requirement for the arrangement of the photo-sensors 12, for example, the directions of the photo-sensors 12 are required to be unified to unify the directions of the x coordinate and the y coordinate of the pixel array, which increases the complexity of the manufacturing process.

Next, the case where the photosensitive chip 12 includes a plurality of photosensitive areas 1210 independent of each other will be taken as an example, and other components of the biometric module 10 and the relationship between the components will be described.

Referring to fig. 2, in some embodiments, the biometric module 10 includes a lens holder 13. The lens base 13 includes a first end surface 13a and a second end surface 13b opposite to each other, the first end surface 13a is provided with an accommodating groove 131, the second end surface 13b is provided with a plurality of mounting holes 132, and the mounting holes 132 are all communicated with the accommodating groove 131. The plurality of lenses 11 are respectively fixed in the plurality of mounting holes 132, and each mounting hole 132 corresponds to one lens 11. A plurality of light inlets 1321 are opened at an end of the mounting hole 132 away from the light sensing chip 12, and light rays carrying skin texture information can enter the lens 11 through the light inlets 1321. In some embodiments, the photosensitive chip 12 is accommodated in the accommodating groove 131. In some embodiments, the lens holder 13 is made of opaque plastic.

In addition, in some embodiments, the lens 11 includes a lens barrel, and the lens in the lens 11 is fixed in the lens barrel, and a glue can be dispensed between an outer wall of the lens barrel (an outer wall of the lens) and an inner wall of the mounting hole 132, so that the lens 11 is fixedly connected to the lens holder 13, and at this time, the biometric identification module 10 is a fixed-focus biometric identification module. In some embodiments, the biometric module 10 further includes a plurality of voice coil motors, the lens 11 is disposed in the voice coil motors, and the outer wall of the single lens barrel is screwed with the inner wall of the single voice coil motor, and the glue is dispensed between the outer wall of the voice coil motor and the inner wall of the mounting hole 132, so that the above structure can enable the lens 11 to move relative to the lens holder 13, and the biometric module 10 is a zoom biometric module.

In some embodiments, the biometric module 10 further includes a circuit board 14, and the photosensitive chip 12 is disposed on the circuit board 14 and electrically connected to the circuit board 14. In some of the embodiments, the first end surface 13a of the mirror base 13 is directly disposed on the circuit board 14. The light carrying the line information is received by the photosensitive chip 12 and then converted into an electric signal, and the electric signal is transmitted to the image processor through the circuit board 14 for analysis, so that the detected object is identified. Compared with the arrangement of a plurality of photosensitive chips 200, the structure of arranging one photosensitive chip 12 can avoid multiple times of electric connection, and simplify the process of assembling the biological recognition module 10.

As shown in fig. 2 and fig. 3, in some embodiments, the biometric module 10 further includes a filter 121, and the filter 121 may be an infrared filter or a visible light filter. In some embodiments, the filter 121 is directly disposed on the surface of the light sensing chip 12 away from the circuit board 14. In this case, compared to a general lens imaging module, the filter 121 is directly disposed on the surface of the photo sensor chip 12, so that a bracket structure (for fixing the filter) can be omitted, thereby reducing the size and cost of the biometric module 10.

Specifically, when the light source for irradiating the object to be measured is an infrared light source, the filter 121 may be provided as a visible light filter to filter visible light; when the light source for irradiating the object to be measured is a visible light source, the filter 121 may be provided as an infrared filter to filter infrared light. The light that shines the measured object is in being reflected to biological identification module 10, is received by sensitization chip 12 after lens 11, filter 121 afterwards, and the setting of filter 121 can eliminate the imaging interference of interference light to sensitization chip 12 to promote biological identification module 10's recognition performance.

In some embodiments, a void layer 1311 is further disposed between the plurality of lenses 11 and the photosensitive chip 12. Specifically, when the filter 121 is disposed on the surface of the light sensing chip 12, the void layer 1311 is disposed between the plurality of lenses 11 and the filter 121. The provision of the void layer 1311 enables the biometric identification module 10 to accommodate other components, thereby increasing design flexibility. Meanwhile, the void layer 1311 can also serve as a heat dissipation space for the photo sensor 12, so as to prevent damage to the photo sensor 12 due to insufficient heat dissipation caused by too tight parts. In general, since the lens in the lens 11 has a certain focal length (if the light sensing chip 12 is directly disposed close to the lens 11, clear imaging cannot be obtained), the void layer 1311 can also provide a suitable space (back focal length) between the lens 11 and the light sensing chip 12, so that the texture information of the object to be measured can be clearly imaged on the light sensing chip 12.

The biometric module 10 is described in detail below with several specific embodiments. It should be noted that, in each embodiment, the cover plate 40 is introduced as an intermediate component between the object to be tested and the biometric module 10, the fingerprint or the palm print can be pressed on the side of the cover plate 40 away from the biometric module 10, and at this time, the capturing area 111 corresponding to the lens 11 will be located on the side of the cover plate 40 away from the biometric module 10.

Referring to fig. 1 and 2, in some embodiments, the biometric module 10 includes two lenses 11, the two lenses 11 are arranged in a straight line, and the lens holder 13 fixes the two lenses 11 and the photo sensor chip 12. One side of the lens base 13 is provided with light inlets 1321 corresponding to the number of the lenses 11, and the lenses 11 are opposite to the light inlets 1321. The light ray carrying the texture information of the object to be detected in the collection region 111 is focused by the lens 11 and then imaged on the photosensitive chip 12 on the image side of the lens 11, specifically, the texture information in the collection region 111 is imaged on the photosensitive region 1210 on the photosensitive chip 12.

Referring to fig. 3, in some embodiments, the acquisition regions 111 are circular and the center of one acquisition region 111 is at the edge of another acquisition region 111, thereby allowing the biometric identification module 10 to have a continuous acquisition region and a smaller module size. At this time, the overlap region 1112 is a second order overlap region. The acquisition regions 111 corresponding to the two lenses 11 enable the biometric identification module 10 to identify a region of the object to be detected, which is approximately rectangular, and simultaneously enable the biometric identification module 10 to have a smaller size. Specifically, in one of the embodiments, when the diameter of the acquisition regions 111 is L, the two acquisition regions 111 can have an acquisition area of approximately L x 1.5L. Compared with the collection area (L × L) possessed by the single-lens module, the biometric identification module 10 with the above structure can enlarge the collection area, thereby having better identification performance.

Referring to fig. 4, in some embodiments, the lens holder 13 can provide a compact fixing effect for the two lenses 11 and the photosensitive chips 12, so that the biometric module 10 has a relatively small photosensitive chip 12 while having a large capture area.

Referring to fig. 5, in some embodiments, the biometric module 10 is provided with three lenses 11. The three lenses 11 are arranged in a triangular manner in the lens holder 13. The structure of the lens 11 arranged in a triangular shape can form an approximately rectangular acquisition region, so that a large area and an approximately rectangular region in a measured object can be detected.

Referring to fig. 6 and 7, in some embodiments, the light rays carrying the texture information of the object to be detected on the collection areas 111 enter the biometric module 10 from the cover plate 40, and after being converged by the lens 11 in the biometric module 10, the light rays are imaged on the photosensitive areas 1210 of the photosensitive chip 12 and received, wherein each collection area 111 corresponds to one photosensitive area 1210.

Referring to fig. 8, in some embodiments, the collection area 111 is circular, and the central connecting line of the collection areas 111 corresponding to the three lenses 11 is a regular triangle. Preferably, in some embodiments, the center of any one acquisition region 111 is at the edge of the other two acquisition regions 111, so that the biometric identification module 10 can maintain a small module size while having a large and continuous acquisition region. In this case, the middle overlapping area 1112a is a third-order overlapping area, and the sub-overlapping area 1112b is a second-order overlapping area. Specifically, in one of the embodiments, when the diameter of the acquisition regions 111 is L, the three acquisition regions 111 can have an acquisition area of approximately 1.5L by 1.5L. Compared with the structure of two lenses 11, the module having three lenses 11 has a larger capture area.

Referring to fig. 9, in some embodiments, the lens holder 13 can be used to compactly fix the three lenses 11 and the photo sensor chips 12, so that the biometric module 10 has a relatively small photo sensor chip 12 while having a large capture area.

Referring to fig. 10, the three lenses 11 may be arranged in a straight line, and the centers of the three lenses 11 are located on the same straight line. Compared with the structure of two lenses, the structure that the three lenses 11 are linearly arranged can detect a larger-area rectangular area in the object to be detected.

Referring to fig. 11, the light beam carrying the texture information of the object to be detected on the collection areas 111 enters the biometric module 10 from the cover plate 40, and after being converged by the lens 11 in the biometric module 10, the light beam is imaged on the photosensitive area 1210 of the photosensitive chip 12 and received, wherein each collection area 111 corresponds to one photosensitive area 1210.

Referring to fig. 12, in some embodiments, the acquisition regions 111 are circular and the centers of the three acquisition regions 111 are collinear. Preferably, in some embodiments, the centers of the two side acquisition regions 111 are located at the edge of the middle acquisition region 111, and the center of the middle acquisition region 111 is also located at the edge of the two side acquisition regions 111, so that the biometric identification module 10 can maintain a small module size while having a large and continuous acquisition region. At this time, the overlap region 1112 is a second order overlap region. Specifically, in one of the embodiments, when the diameter of the acquisition regions 111 is L, the three acquisition regions 111 can have an acquisition area of approximately L × 2L. At this time, the biometric authentication module 10 having the above-described structure is advantageous for authenticating an object to be inspected having a substantially rectangular shape.

Referring to fig. 13, in some embodiments, the lens holder 13 can be used to compactly fix the three lenses 11 and the photo sensor chips 12, so that the biometric module 10 has a relatively small photo sensor chip 12 while having a large capture area.

Referring to fig. 14, the biometric authentication module 10 is provided with four lenses 11. The four lenses 11 are arranged in a rectangular shape in the lens holder 13. The structure of the rectangular lens 11 can form an approximately rectangular acquisition region, so that a large area and an approximately rectangular region in a measured object can be detected.

Referring to fig. 14 and 15, in some embodiments, the light rays carrying the texture information of the object to be detected on the collection areas 111 enter the biometric module 10 from the cover plate 40, and after being converged by the lens 11 in the biometric module 10, the light rays are imaged on the photosensitive areas 1210 of the photosensitive chip 12 and received, where each collection area 111 corresponds to one photosensitive area 1210.

Referring to fig. 16, in some embodiments, the collection area 111 is circular and the central connecting lines of the collection areas 111 corresponding to the four lenses 11 form a rectangular pattern. Preferably, in some embodiments, the center of any one of the acquisition regions 111 is located at the edge of two adjacent acquisition regions 111, so that the biometric identification module 10 can maintain a small size while having a large and continuous acquisition region. In this case, the middle overlapping area 1112a is a fourth-order overlapping area, the sub-overlapping area 1112b is a third-order overlapping area, and the edge overlapping area 1112c is a second-order overlapping area. Specifically, in one embodiment, when the diameter of the acquisition regions 111 is L, the four acquisition regions 111 can have an acquisition area of approximately 1.5L by 1.5L. Compared to the embodiment in which the central connecting line of the capturing regions 111 corresponding to the three lenses 11 is in the shape of a regular triangle, although the two capturing regions have relatively consistent capturing areas, in the embodiment of the four lenses 11, the ratio of the occupied areas of the overlapping regions 1112 is larger, so that the recognition accuracy is higher.

Referring to fig. 17, in some embodiments, the lens holder 13 can provide a compact fixing effect for the four lenses 11 and the photo sensor chips 12, so that the biometric module 10 has a relatively small photo sensor chip 12 while having a large capture area.

In other embodiments, the biometric module 10 may also be provided with five, six, seven or more lenses 11. The number and arrangement of the lenses 11 in the biometric module 10 depend on the actual usage (the requirements for acquisition area, accuracy, and module size).

In addition, as shown in fig. 18, in some embodiments, the biometric module 10 further includes a light source 15 disposed on an outer surface of the lens holder 13 away from the photosensitive chip 12. The light source 15 provides light to illuminate the object to be measured. In some embodiments, the light source 15 may be a visible light source or an infrared light source, and may specifically be a Vertical External Cavity Surface Emitting Laser (VECSEL), an edge emitting laser, an LED lamp, or other types of light sources, which are not limited in this application.

Referring to fig. 19 and 20, in some embodiments, the biometric module 10 is applied to the mobile terminal 20. The mobile terminal 20 further includes a cover plate 40 (refer to the cover plate introduced in any of the above embodiments), and the biometric module 10 is disposed on one side of the cover plate 40, wherein the surface to be measured of the biometric module 10 is located on one side of the cover plate 40 away from the biometric module 10.

As shown in fig. 20, in some embodiments, the mobile terminal 20 further includes a display module 50, the cover plate 40 is disposed on a light emitting surface side of the display module 50, and the biometric module 10 is disposed on a side of the display module 50 away from the cover plate 40, wherein the surface to be measured 110 in the biometric module 10 is located on a side of the cover plate 40 away from the biometric module 10.

In some embodiments, when the biometric module 10 does not have a light source, the biometric module 10 may be disposed on a side of the display module 50 away from the cover plate 40, specifically, in a direction perpendicular to the cover plate 40, a projection of the display module 50 covers a projection of the biometric module 10, the display module 50 at this time may serve as the light source of the biometric module 10, and the biometric module 10 may identify an object located in a display area (an area corresponding to the display module 50) on the cover plate 40. The display module 50 is an Organic Light-Emitting Diode (OLED). For example, when the measured object is pressed on the area of the cover plate 40 corresponding to the biometric identification module 10, the light emitted by the display module 50 can irradiate the measured object on the cover plate 40, the light reflected by the measured object carries the line information of the surface of the measured object, the light carrying the line information passes through the display module 50 and then reaches the biometric identification module 10 and is received, and then the line information is transmitted to the image processor for analysis. The mobile terminal 20 at this time has the function of fingerprint or palm print recognition under the screen, that is, the biometric module 10 can be hidden at the back of the display module 50, and a fingerprint recognition area is not required to be additionally arranged on one side of the cover plate 40 of the mobile terminal 10, so that the mobile terminal 20 has the ultra-narrow frame characteristic (high screen occupation ratio), thereby being beneficial to realizing the design of a full-face screen.

As shown in fig. 21, in another embodiment, when the biometric module 10 is provided with a light source (in combination with the embodiment shown in fig. 18), the projection of the display module 50 is independent of the projection of the biometric module 10 in the direction perpendicular to the cover 40, i.e. the display module 50 and the biometric module 10 are disposed in a staggered manner in the direction perpendicular to the cover 40. At this moment, the light entering the biometric identification module 10 does not pass through the display module 50, so that the light can be prevented from being shielded by the display module 50, and the biometric identification module 10 can identify the measured object located in the non-display area (the area not corresponding to the display module 50) on the cover plate 40. For example, when the object to be measured is pressed on the area (non-display area) of the cover plate 40 corresponding to the biometric module 10, the light emitted from the light source of the biometric module 10 can irradiate the object to be measured on the cover plate 40, the light reflected by the object to be measured carries the line information of the surface of the object to be measured, the light carrying the line information passes through the cover plate 40 and then reaches the biometric module 10 and is received, and then the line information is transmitted to the image processor for analysis.

In other embodiments, when the biometric module 10 has a light source, the biometric module 10 can also be disposed at the bottom of the keys of the mobile terminal 20 without using the light source of the display module 50. In other embodiments, the biometric module 10 with its own light source can also be disposed on the back side of the mobile terminal 20 (e.g. inside the battery cover), so as to realize the back fingerprint recognition. At this time, the light source of the biometric identification module 10 can emit light to the object to be measured to obtain the texture information of the object to be measured, and transmit the texture information to the photosensitive chip 12.

The mobile terminal 20 using the biometric identification module 10 can collect and accurately identify large-area skin lines such as fingerprints or palm prints, thereby having high identification performance.

Specifically, the mobile terminal 20 may be a full-screen smart phone, a mobile phone, a PDA (Personal digital assistant), a game machine, a PC, or other information terminal devices.

In addition, referring to fig. 22, the biometric module 10 can also be used in an electronic device 60 with security monitoring functions such as fingerprint identification and palm print identification. In some embodiments, the electronic device 60 may be a fingerprint lock, a fingerprint attendance machine, or the like.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The utility model provides a biological identification module, is including being used for the face that awaits measuring with measured object direct contact, its characterized in that, biological identification module includes:

2. The biometric identification module of claim 1, wherein a center of one of the acquisition regions is at an edge of the other of the acquisition regions in two adjacent acquisition regions.

3. The biometric module of claim 1, wherein the centers of the plurality of capture areas are arranged in a linear or polygonal pattern.

4. The biometric module of claim 1, wherein the optical axes of the plurality of lenses are parallel or intersect at a point.

5. The biometric module of claim 1, wherein a gap layer is disposed between the plurality of lenses and the photosensitive chip, the gap layer separating the plurality of lenses and the photosensitive chip.

6. The biometric module of claim 1, wherein the number of photo-sensors is one.

7. The biometric module of claim 6, wherein the photosensitive chip includes a plurality of photosensitive areas independent of each other, and each of the photosensitive areas corresponds to one of the lenses.

8. The biometric module as claimed in claim 1, further comprising a lens holder, the lens holder comprising a first end surface and a second end surface opposite to the first end surface, the first end surface defining a receiving slot, the second end surface defining a plurality of mounting holes, the mounting holes being communicated with the receiving slot, the lenses being disposed in the mounting holes, respectively, and the photosensitive chip being disposed in the receiving slot.

9. The biometric module of claim 8, further comprising a circuit board, wherein the light sensor chip is disposed on the circuit board and electrically connected to the circuit board, and the first end surface is disposed directly on the circuit board; and the biological identification module also comprises an optical filter, and the optical filter is arranged on the surface of the photosensitive chip far away from the circuit board.

10. A mobile terminal, comprising:

a cover plate; and

the biometric module as set forth in any one of claims 1 to 9, wherein the surface to be measured is located on a side of the cover plate away from the biometric module.

11. The mobile terminal according to claim 10, further comprising a display module, wherein the cover is disposed on a light emitting surface side of the display module, and the biometric identification module is disposed on a side of the display module away from the cover; wherein

In the direction perpendicular to apron, the projection of display module assembly covers the projection of biological identification module assembly, or the projection of display module assembly with the projection of biological identification module assembly is independent each other.

12. An electronic device comprising the biometric module of any one of claims 1-9.