WO2018113122A1

WO2018113122A1 - Biometric identification device

Info

Publication number: WO2018113122A1
Application number: PCT/CN2017/078388
Authority: WO
Inventors: 王炯翰
Original assignee: 创智能科技股份有限公司
Priority date: 2016-12-23
Filing date: 2017-03-28
Publication date: 2018-06-28
Also published as: TWI647622B; CN108241827A; TW201824065A

Abstract

Provided is a biometric identification device, comprising a light guide assembly, a first optical micro-structure, a second optical micro-structure, a light source, an image-capturing assembly and a light control assembly. The light guide assembly is provided with a first surface and a second surface which are opposite one another. The first optical micro-structure is provided with a first reflective surface. First light beams emitted by the light source can be transmitted to the first surface of the light guide assembly in a collimated manner by being reflected by the first reflective surface of the first optical micro-structure, thereby enabling the first light beams reflected by an object to be identified to be transmitted to the image-capturing assembly in a collimated manner. The second optical micro-structure is provided with a second reflective surface. Second light beams emitted by the light source are reflected by the second reflective surface of the second optical micro-structure, and transmitted to the first surface of the light guide assembly in an oblique manner. After passing through the first surface of the light guide assembly, the second light beams are reflected to the light control assembly by the object to be identified. The light control assembly refracts and reflects the second light beams, so that the second light beams are transmitted to the image-capturing assembly in a collimated manner. Thus, the image-capturing quality of the biometric identification device is improved.

Description

Biometric device

Technical field

The invention relates to a biometric device.

Background technique

The types of biometrics include face, sound, iris, retina, veins, and fingerprint recognition. Since each person's fingerprint is unique and the fingerprint is not easy to change with age or physical health, the fingerprint identification device has become the most popular biometric device. According to the different sensing methods, the fingerprint identification device can be divided into optical and capacitive. When the capacitive fingerprint identification device is assembled in an electronic product (for example, a mobile phone or a tablet computer), a capacitive fingerprint identification device is provided with a cover lens, and the sensing effect of the capacitive fingerprint recognition device is protected by the protection component. influences. Therefore, optical fingerprint recognition devices have also received much attention.

The optical fingerprint identification device comprises a light source, an image capturing component and a light transmitting component. The light source is used to emit a light beam to illuminate a finger pressed against the light transmissive component. Finger fingerprints are made up of a number of irregular ridges and indentations. The beams reflected by the ridges and the indentations are formed as a fingerprint image of the light and dark interlaced on the receiving surface of the image capturing assembly. The image capturing component can convert the fingerprint image into corresponding image information and input the image information into the processing unit. The processing unit may use an algorithm to calculate image information corresponding to the fingerprint for identification of the user. However, in the above image capturing process, the light beam reflected by the fingerprint is easily transmitted to the image capturing component, which results in poor image quality and affects the identification result.

Summary of the invention

The invention provides a biometric device.

According to an embodiment of the invention, the biometric device comprises a light guiding component, a plurality of first optical microstructures, a plurality of second optical microstructures, a light source, an image capturing component and a light control component. The light guiding assembly has opposing first and second surfaces. A plurality of first optical microstructures are formed on the second surface of the light guide assembly. Each of the first optical microstructures has at least one first reflective surface. A plurality of second optical microstructures are formed on the second surface of the light guide assembly. Each second optical microstructure has a second reflection surface. The light source is configured to emit the first beam and the second beam. The image capture assembly is disposed relative to the second surface of the light guide assembly. The light control component is disposed between the plurality of second optical microstructures and the image capturing component. The first beam is reflected by at least one first reflective surface of each of the first optical microstructures to be collimated to guide the first surface of the light assembly. The second beam is reflected by the second reflecting surface of each of the second optical microstructures and is transmitted obliquely and through the first surface of the light guiding component to the object to be identified. The second light beam is reflected by the object to be identified to the light control component. The light control assembly refracts and reflects the second beam such that the second beam is collimated to the image capture assembly.

In the biometric device according to the embodiment of the present invention, the at least one first reflecting surface includes two first reflecting surfaces, the two first reflecting surfaces are inclined with respect to the first surface of the light guiding assembly, and the two first reflecting surfaces The oblique directions are opposite, wherein the first light beam is sequentially reflected by the two first reflective surfaces of each optical microstructure to collimate the first surface of the light assembly.

In the biometric device according to an embodiment of the present invention, at least the first reflecting surface includes a curved surface, wherein the first light beam is reflected by two different portions of the curved surface to collimately guide the first surface of the light assembly.

In the biometric device according to the embodiment of the present invention, the first light beam is reflected by the object to be recognized after passing through the first surface of the light guiding component, and the image capturing component receives the first light beam reflected by the object to be recognized to obtain An image of the object.

In the biometric device according to an embodiment of the present invention, the second reflecting surface is inclined with respect to the first surface of the light guiding member.

In the biometric device according to the embodiment of the present invention, the second reflecting surface is a curved surface.

In the biometric device according to an embodiment of the present invention, the light control assembly includes a plurality of microprisms. Each microprism has a bottom surface and a plurality of sides. The plurality of sides are inclined with respect to the first surface of the light guiding assembly, and the inclined directions of the plurality of sides are opposite. The bottom surface is connected between the plurality of sides. The second light beam reflected by the object to be recognized is sequentially refracted by one of the plurality of sides, and is reflected by the other of the plurality of sides to be emitted from the bottom surface.

In the biometric device according to the embodiment of the present invention, the image capturing assembly has a light receiving surface, and the second light beam emitted from the bottom surface of the microprism has an angle θ with respect to the reference axis perpendicular to the light receiving surface, and -15° ≤ θ ≤ 15°.

In the biometric device according to an embodiment of the present invention, the biometric device further includes a light transmissive component. The light transmissive component is disposed on the first surface of the light guide assembly. The light transmissive component has a pressing surface to For the object to be identified.

In the biometric device according to an embodiment of the present invention, the biometric device further includes a collimating component. The collimating component is disposed between the second surface of the light guiding component and the image capturing component.

In the biometric device according to an embodiment of the present invention, the light guiding assembly further has an outer side wall. The outer sidewall is coupled to the first surface and extends toward a side of the second surface. The first beam and the second beam enter the light guide assembly from the outer sidewall.

In the biometric device according to an embodiment of the present invention, the light guiding assembly further has an outer side wall, an inner side wall, and a bottom surface. The outer sidewall is coupled to the first surface and extends toward a side of the second surface. The inner sidewall is coupled to the second surface and disposed opposite the outer sidewall. The bottom surface is disposed opposite to the first surface and is coupled between the outer sidewall and the inner sidewall. The first beam and the second beam enter the light guiding component from the bottom surface of the light guiding component.

In the biometric device according to an embodiment of the present invention, the first light beam and the second light beam include visible light, invisible light, or a combination thereof.

In the biometric device according to an embodiment of the present invention, the object to be recognized includes a fingerprint, a vein, a palm print, or a combination of at least two of the above.

Based on the above, the biometric device according to an embodiment of the invention includes a light guiding component, a plurality of first optical microstructures, a plurality of second optical microstructures, a light source, an image capturing component, and a light control component. The first light beam emitted by the light source can be collimated to be transmitted to the first surface of the light assembly by the reflection of the at least one first reflecting surface of the first optical microstructure, so that the first light beam reflected by the object to be recognized is collimated Pass to the image capture component. With the second reflecting surface of the second optical microstructure, the second light beam emitted by the light source can be dispersed over a large range to allow the biometric device to have a sufficient working area. More importantly, with the refraction and reflection of the light control component, the direction of travel of the second beam that is originally transmitted obliquely toward the image capture assembly can be changed, and the second beam can be made after passing through the light control component. Pass directly to the image capture component. Thereby, the image quality of the biometric device is improved, thereby increasing the recognition capability of the biometric device.

DRAWINGS

The drawings are included to provide a further understanding of the invention, and the drawings are incorporated in the specification. The drawings illustrate embodiments of the invention and, together with

1 is a cross-sectional view showing a biometric device according to an embodiment of the present invention;

2 shows a process of the light control component according to an embodiment of the present invention and the second light beam reflected by the object to be recognized being transmitted in the light guiding component and the light control component to be incident on the image capturing component;

3 is a cross-sectional view showing a biometric device according to another embodiment of the present invention;

4 is a cross-sectional view showing a biometric device according to still another embodiment of the present invention;

FIG. 5 is a cross-sectional view of a biometric device according to still another embodiment of the present invention.

Symbol Description:

10: the object to be identified;

100, 100A, 100B, 100C: biometric device;

110: a light guiding component;

112: a first surface;

113: a groove;

114: a second surface;

116: outer side wall;

118: inner side wall;

119: the bottom surface;

119a: depression;

122, 122C: a first optical microstructure;

122a, 122b: a first reflecting surface;

122c, 124c: surface;

124, 124C: second optical microstructure;

124a: a second reflecting surface;

124b: connecting surface;

130: a light source;

140: an image capturing component;

142: a pixel area;

150: light control component;

152: microprism;

152a: the bottom surface;

152b, 152c: side

160: a light transmissive component;

162: pressing surface;

170, 192, 194, 198: optical glue;

180: collimation assembly;

184: light transmitting area;

196: circuit board;

199: support;

L1: first beam;

L2: second beam;

X: reference axis;

α: prism angle;

θ: exit angle

θ': the angle.

detailed description

Reference will now be made in detail to the exemplary embodiments embodiments Whenever possible, the same component symbols are used in the drawings and description to refer to the same or similar parts.

1 is a schematic cross-sectional view of a biometric device according to an embodiment of the present invention. Referring to FIG. 1 , the biometric device 100 includes a light guiding component 110 , a plurality of first optical microstructures 122 , a plurality of second optical microstructures 124 , a light source 130 , and an image capturing component 140 . The light guide assembly 110 has opposing first and

second surfaces

112, 114. In this embodiment, the light guide assembly 110 further has an outer sidewall 116, an inner sidewall 118, and a bottom surface 119. The outer sidewall 116 is coupled to the first surface 112 and extends toward the side of the second surface 114. The inner sidewall 118 is coupled to the second surface 114 and disposed opposite the outer sidewall 116. The bottom surface 119 is disposed opposite to the first surface 112 and is coupled between the outer sidewall 116 and the inner sidewall 118. In the present embodiment, the inner side wall 118 and the second surface 114 may define the recess 113, but the invention is not limited thereto. In this embodiment, the material of the light guiding component 110 may be glass, polycarbonate (PC), polymethyl methacrylate (PMMA) or other suitable materials.

A plurality of first optical microstructures 122 are formed on the second surface 114 of the light guide assembly 110. In this embodiment, the material of the first optical microstructure 122 and the material of the light guiding component 110 can be the same. In other words, the first optical microstructure 122 and the light guiding component 110 can be integrally formed. However, the invention is not limited thereto, In other embodiments, the first optical microstructure 122 and the light guiding component 110 can also be separately fabricated, and then the first optical microstructure 122 is disposed on the second surface 114 of the light guiding component 110. It should be noted that each of the first optical microstructures 122 has at least one first

reflective surface

122a, 122b. For example, in the embodiment, each of the first optical microstructures 122 has a first reflective surface 122a and a second reflective surface 122b. The first reflective surface 122a and the second reflective surface 122b are inclined with respect to the first surface 112 of the light guiding component 110, and the oblique directions of the first reflective surface 122a and the second reflective surface 122b are opposite. In this embodiment, the first reflective surface 122a and the second reflective surface 122b of the same first optical microstructure 122 may be directly connected, and the first optical microstructure 122 may be a V-shaped protrusion. However, the present invention is not limited thereto. In other embodiments, the first optical microstructures 122 may also have other suitable shapes, and at least the first

reflective surfaces

122a, 122b of each of the first optical microstructures 122 need not necessarily be multiple. A plane (for example, two first reflecting

surfaces

122a, 122b) is formed.

Light source 130 is used to emit a light beam. The light beam includes a first light beam L1 and a second light beam L2. In the present embodiment, the first light beam L1 is, for example, invisible light (for example, infrared light), and the second light beam L2 is, for example, visible light (for example, red light, blue light, green light, or a combination thereof), but the present invention is not limited thereto. In another embodiment, the first light beam L1 and the second light beam L2 may also be invisible light; in still another embodiment, the first light beam L1 and the second light beam L2 may also be visible light; In the example, the first light beam L1 may also be visible light, and the second light beam L2 may also be invisible light. The first light beam L1 and the second light beam L2 may be emitted simultaneously or at different points in time (for example, alternately emitted). In the present embodiment, the light source 130 is, for example, a light emitting diode. However, the present invention is not limited thereto. In other embodiments, the light source 130 may also be other suitable types of light emitting components. FIG. 1 shows one light source 130 as an example, and the light source 130 is disposed on one side of the light guiding assembly 110. However, the present invention is not limited thereto. In other embodiments, the number of the light sources 130 may also be multiple, and/or the light source 130 may also be disposed on both sides or three or more sides of the light guiding assembly 110.

In this embodiment, the first light beam L1 and the second light beam L2 may enter the light guiding component 110 from the bottom surface 119 of the light guiding component 110. In detail, the biometric device 100 can further include a circuit board 196. The light source 130 can be disposed on the circuit board 196 and electrically connected to the circuit board 196. The bottom surface 119 of the light guide assembly 110 can be secured to the circuit board 196. The bottom surface 119 of the light guiding assembly 110 can have a recess 119a. The light source 130 can be selectively disposed in the space surrounded by the recess 119a and the circuit board 196. The light beam L can be incident on the light guiding assembly 110 from the recess 119a. However, the present invention is not limited thereto. In another embodiment, the bottom surface 119 of the light guiding component 110 may have no recess 119a, and the circuit board 196 may have a recess (not shown). The light source 130 can be disposed in the recess of the circuit board 196. The bottom surface 119 of the light guiding component 110 is disposed above the recess of the circuit board 196, and the first light beam L1 and the second light beam L2 can also have the bottom surface of the recess 119a. 119 enters the light guide assembly 110. It should be noted that the position of the light source 130 and the area where the first light beam L1 and the second light beam L2 are incident on the light guiding component 110 are only for illustrating the invention and are not intended to limit the present invention. In other embodiments, the light source 130 The first light beam L1 and the second light beam L2 may also be incident on the light guiding component 110 from other regions of the light guiding component 110.

The image capture assembly 140 is disposed relative to the second surface 114 of the light guide assembly 110. In detail, in the embodiment, the image capturing component 140 can be disposed on the circuit board 196 and electrically connected to the circuit board 196. Further, in this embodiment, the second surface 114 and the inner sidewall 118 of the light guiding component 110 can define a recess 113, and the image capturing assembly 140 can be disposed in the recess 113 of the light guiding component 110. However, the invention is not limited thereto. The image capturing component 140 has a plurality of pixel regions 142 arranged in an array to receive the first light beam L1 and the second light beam L2 reflected by the object to be recognized 10, thereby obtaining an image of the object 10 to be identified. In this embodiment, the image capturing component 140 can be a charge-coupled device (CCD), a complementary metal oxide semiconductor (CMOS), or other suitable type of image sensor array.

In the embodiment, the biometric device 100 further includes a light transmissive component 160. The light transmissive component 160 is disposed on the first surface 112 of the light guide assembly 110 . The light transmissive component 160 has a pressing surface 162 that faces the light guide assembly 110. The pressing surface 162 is pressed by the object to be recognized 10. In the present embodiment, under normal use, the object to be identified 10 may be a biometric (eg, vein, etc.) inside the living being, a biological feature of the surface of the living being (eg, a fingerprint, a palm print, or at least two of the above). The combination, etc.), or the biological characteristics of the internal and external parts of the organism. However, the present invention is not limited thereto, and in the case of abnormal use, the object to be identified 10 may also be a forgery such as a fake finger. In the present embodiment, the biometric device 100 further includes an optical glue 170. The light transmissive component 160 is connectable to the first surface 112 of the light guide component 110 through the optical adhesive 170. In this embodiment, the refractive indices of the light transmissive component 160, the optical adhesive 170, and the light guiding component 110 may be the same or similar to reduce the boundary between the first light beam L1 and the second light beam L2 at the light transmitting component 160 and the optical adhesive 170. The reflection of the interface between the optical glue 170 and the light guiding component 110 further enhances the light utilization efficiency and/or image quality of the biometric device 100. However, the present invention is not limited thereto. In other embodiments, the refractive indices of the light transmissive component 160, the optical adhesive 170, and the light guiding component 110 may also be different.

It should be noted that, in this embodiment, after the light source 130 emits the first light beam L1, the first light beam L1 is sequentially reflected by the first

reflective surfaces

122a, 122b of the first optical microstructure 122 to collimate the light guide assembly. The first surface 112 of 110 is passed. In other words, the incident angle of the first light beam L1 entering the first surface 112 through the reflection of the first optical microstructure 122 may be 0 degrees or close to 0 degrees (for example, -15 degrees to +15 degrees). The incident angle is a negative value when the direction from the normal of the first surface 112 to the first light beam L1 is clockwise; if the direction from the normal of the first surface 112 to the first light beam L1 is counterclockwise, Then the incident angle is positive). The first light beam L1 is reflected by the object to be recognized 10 after passing through the first surface 112 of the light guiding component 110, wherein the reflection includes diffuse reflection. After being reflected by the object to be recognized 10, the first light beam L1 passes through the pressing surface 162 of the light transmitting component 160 and passes through the light guiding component 110 to enter the image capturing component 140. The image capturing component 140 receives the first light beam L1 reflected by the object to be recognized 10 to obtain an image of the object to be recognized 10 (for example, a biometric of the interior of the object 10 to be identified). In particular, by utilizing the reflection of the first

reflective surfaces

122a, 122b of the first optical microstructure 122, the first light beam L1 can collimately enter the identifier 10, thereby allowing the first light beam L1 reflected by the object 10 to be collimated. To image capture component 140. Thereby, the image capturing quality of the biometric device 100 is improved, thereby increasing the recognition capability of the biometric device 100.

A plurality of second optical microstructures 124 are formed on the second surface 114 of the light guide assembly 110. In this embodiment, the material of the second optical microstructure 124 and the material of the light guiding component 110 can be the same. In other words, the second optical microstructure 124 and the light guiding component 110 can be integrally formed. However, the present invention is not limited thereto. In other embodiments, the second optical microstructure 124 and the light guiding component 110 may also be separately fabricated, and then the second optical microstructure 124 is disposed on the second surface of the light guiding component 110. 114 on. It is noted that each of the second optical microstructures 124 has a second reflective surface 124a. In this embodiment, the second reflective surface 124a may be a plane inclined with respect to the first surface 112 of the light guiding component 110, but the invention is not limited thereto. More specifically, each of the second optical microstructures 124 also has a connection surface 124b. The connecting surface 124b is connected between the two second reflecting surfaces 124a of the adjacent two second optical microstructures 124. In this embodiment, the connecting surface 124b can be inclined with respect to the first surface 112 of the light guiding component 110, and the oblique direction of the connecting surface 124b and the second reflecting surface 124a can be opposite. However, the invention is not limited thereto, and in other embodiments, the connecting surface 124b may also be designed in other suitable configurations.

In this embodiment, the plurality of first optical microstructures 122 and the plurality of second optical microstructures 124 can be respectively concentrated in two different regions (for example, the left side and the right side of the second surface 114 of the light guiding component 110) ). However, the invention is not limited thereto, and in other embodiments, the plurality of first optical microstructures 122 The plurality of second optical microstructures 124 may also be interspersed with each other and dispersed in the same region.

The light control component 150 is disposed between the plurality of second optical microstructures 124 and the image capturing component 140. In this embodiment, the light control component 150 may not be disposed between the plurality of first optical microstructures 122 and the image capturing component 140, but the invention is not limited thereto. In the present embodiment, the biometric device 100 further includes an optical adhesive 192 that is selectively connectable to the second optical microstructure 124 via the optical adhesive 192. However, the present invention is not limited thereto. In other embodiments, the light control component 150 can also be fixed between the plurality of second optical microstructures 124 and the image capturing component 140 by other means. For example, in another embodiment, the light control component 150 can also be fixed to the inner sidewall 118 of the light guide component 110 by using a fixing component (not shown), without necessarily being directly attached to the second optical microstructure 124. .

It should be noted that after the light source 130 emits the second light beam L2, the second light beam L2 is reflected by the second reflective surface 124a of the second optical microstructure 124, and is obliquely transmitted and passed through the first surface 112 of the light guiding component 110 to To be identified 10 . The second light beam L2 passes through the first surface 112 of the light guide assembly 110 and is then reflected by the object to be recognized 10 to the light control assembly 150, wherein the reflection includes diffuse reflection. In particular, the light control assembly 150 refracts and reflects the second light beam L2 such that the second light beam L2 is collimated to the image capture assembly 140. The mechanism by which the light control assembly 150 refracts and reflects the second light beam L2 will be exemplified below using FIG.

FIG. 2 illustrates a process in which the light control component 150 and the second light beam L2 reflected by the object to be recognized 10 are transmitted in the light guiding component 110 and the light control component 150 to be incident on the image capturing component 140. Referring to FIGS. 1 and 2, the light control assembly 150 includes a plurality of microprisms 152. Each microprism 152 has a bottom surface 152a and a plurality of

side surfaces

152b, 152c. The plurality of

sides

152b, 152c are inclined relative to the first surface 112 of the light directing assembly 110. The inclined directions of the plurality of side faces 152b, 152c are opposite. The bottom surface 152a is connected between the plurality of side faces 152b, 152c. After the second light beam L2 emitted by the light source 130 is reflected by the second reflective surface 124a of the second optical microstructure 124, the object to be recognized 10 is obliquely incident, and the second light beam L2 reflected by the object to be recognized 10 passes through the light guiding component 110. The second light beam L2 is refracted obliquely to the side surface 152b of the light control unit 150, and the second light beam L2 is refracted by the side surface 152b of the microprism 152 to be transmitted to the other side surface 152c of the microprism 152. The side surface 152c of the microprism 152 reflects the second light beam L2 to The second light beam L2 is emitted from the bottom surface 152a and transmitted to the image capturing assembly 140. It is worth mentioning that, by using the second reflective surface 124a of the second optical microstructure 124, the second light beam L2 emitted by the light source 130 can be obliquely transmitted to the first surface 112 of the light guide assembly 110, thereby obliquely incident on the light. Face 162, to be dispersed in In the big range. Since the second light beam L2 is incident obliquely on the pressing surface 162, most of the second light beam L2 reflected by the object to be recognized 10 is obliquely transmitted toward the image capturing assembly 140 before entering the light control assembly 150. However, with the refraction and reflection of the light control component 150, the direction of transmission of the second beam L2 can be changed, and the second beam L2 can be collimated to the image capturing assembly 140 after passing through the light control assembly 150. Thereby, the biometric device 100 can have a good image capturing quality with a sufficient working area (ie, a range in which the second light beam L2 is dispersed on the pressing surface), thereby increasing the recognition capability of the biometric device 100.

Referring to FIG. 2, in the present embodiment, each microprism 152 of the light control assembly 150 has a prism angle α. The prism angle α is an angle between the side surface 152b and the side surface 152c. The microprism 152 has a refractive index n. In this embodiment, in detail, the image capturing component 140 has a light receiving surface 140a, the reference axis X is perpendicular to the light receiving surface 140a, and the second light beam L2 passes through the light guiding component 110 and does not enter the light control component 150. The angle with the reference axis X is θ', and the exit angle of the second light beam L2 from the bottom surface 152a is θ (for example, the angle between the second light beam L2 emerging from the bottom surface 152a and the reference axis X). The exit angle θ and the included angle θ' satisfy the following relationship:

With the above relationship, the size of the prism angle α can be appropriately designed, and the exit angle θ of the second light beam L2 emitted from the self-control light module 150 can be controlled within a certain range (for example, -15° ≤ θ ≤ 15°). Wherein, if the direction from the normal of the bottom surface 152a to the direction of the second light beam L2 is clockwise, the incident angle is a negative value, and if the direction from the normal of the bottom surface 152a to the direction of the second light beam L2 is counterclockwise, The incident angle is a positive value). Thereby, the second light beam L2 can be directly transmitted to the image capturing component 140, so that the image capturing component 140 obtains a good image of the object to be recognized 10, thereby improving the recognition capability of the biological identification device 100.

In the present embodiment, the biometric device 100 can also include a collimation assembly 180. The collimating assembly 180 is disposed between the second surface 114 of the light guiding assembly 110 and the image capturing assembly 140. In this embodiment, the collimating component 180 can be disposed between the plurality of first optical microstructures 122 and the image capturing component 140 and between the plurality of second optical microstructures 124 and the image capturing component 140. However, the invention is not limited thereto. For example, the biometric device 100 further includes an optical adhesive 194, and the collimating assembly 180 can be coupled to the image capturing assembly 140 through the optical adhesive 194, but the invention is not limited thereto. Notably, the collimating assembly 180 has a plurality of light transmissive regions 184. The plurality of light transmissive regions 184 respectively correspond to the plurality of pixel regions 142 of the image capturing component 140. The light beam L reflected by each of the objects to be identified 10 can be transmitted to the corresponding pixel region 142 through a corresponding one of the light transmitting regions 184, and is not easily transferred to the other pixel regions 142. Thereby, the image capturing quality of the biometric device 100 can be further improved. However, the present invention is not limited thereto, and in other embodiments, the biometric device 100 may optionally not include the collimation assembly 180.

3 is a cross-sectional view of a biometric device according to another embodiment of the present invention. The biometric device 100A of FIG. 3 is similar to the biometric device 100 of FIG. 1 in that the position of the light source 130 of the biometric device 100A is different from the position of the light source 130 of the biometric device 100. In detail, in the embodiment of FIG. 3 , the light source 130 can be disposed beside the outer sidewall 116 of the light guiding component 110 , and the first beam L1 and the second beam L2 can enter the light guiding component 110 from the outer sidewall 116 . The biometric device 100A has similar functions and advantages as the biometric device 100 and will not be repeated here.

4 is a cross-sectional view showing a biometric device according to still another embodiment of the present invention. The biometric device 100B of FIG. 4 is similar to the biometric device 100 of FIG. 1 in that the bottom surface 119 of the light guiding component 110 of the biometric device 100B may not be directly disposed on the circuit board 196. The biometric device 100B also includes a support 199. The support 199 may extend from the bottom surface 119 to the side where the light source 130 is located to maintain a gap between the bottom surface 119 and the light source 130. In this embodiment, the support 199 can be integrally formed with the light guide assembly 110, the circuit board 196, or the light source 130, or be a member other than the light guide assembly 110, the circuit board 196, and the light source 130. The biometric device 100B can also include an optical glue 198. The optical glue 198 fills the gap between the bottom surface 119 of the light guiding component 110 and the light source 130 to reduce the loss of the first light beam L1 and the second light beam L2 before entering the light guiding component 110. The biometric device 100B has similar functions and advantages as the biometric device 100 and will not be repeated here.

FIG. 5 is a cross-sectional view of a biometric device according to still another embodiment of the present invention. The biometric device 100C of FIG. 5 is similar to the biometric device 100 of FIG. 1 in that the difference between the first optical microstructure 122C and the second optical microstructure 124C of the biometric device 100C and the first optical of the biometric device 100 The microstructures 122 and the second optical microstructures 124 are different. In detail, in the embodiment of FIG. 5, at least one first reflective surface of each of the first optical microstructures 122C may be a curved surface 122c. The first light beam L1 is reflected by two different portions of the curved surface 122c to be collimated to guide the first surface 112 of the light assembly 110, thereby being reflected by the object to be recognized 10. After being reflected by the object to be recognized 10, the first light beam L1 passes through the pressing surface 162 of the light transmitting component 160 and passes through the light guiding component 110 to enter the image capturing component 140. The image capturing component 140 receives the first light beam L1 to obtain an image of the object 10 to be identified. Additionally, in the embodiment of FIG. 5, at least one reflective surface of each second optical microstructure 124C can be a curved surface 124c. The second light beam L2 is reflected by the curved surface 124c to be transmitted obliquely and through the first surface 112 of the light guiding assembly 110 to the object to be recognized 10. The second light beam L2 reflected by the object to be recognized 10 passes through the pressing surface 162 of the light transmitting component 160 and the light guiding component 110, and then enters the light control component 150 obliquely. The light control assembly 150 refracts and reflects the second light beam L2 such that the second light beam L2 is collimated to the image capture assembly 140. The biometric device 100C has similar functions and advantages as the biometric device 100 and will not be repeated here.

In addition, it should be noted that, in the embodiment of FIG. 5, the biometric device 100C includes both the first optical microstructure 122C having the curved surface 122c and the second optical microstructure 124C having the curved surface 124c. However, the present invention is not limited thereto, and includes a biometric device having a first optical microstructure 122C having a curved surface 122c and a second optical microstructure 124 of FIG. 1, FIG. 3 or FIG. 4, including FIG. 1, FIG. 3 or FIG. The biometric device of the first optical microstructure 122 of 4 and the second optical microstructure 124C having the curved surface 124c is also within the scope of the present invention.

In summary, the biometric device according to an embodiment of the invention includes a light guiding component, a plurality of first optical microstructures, a plurality of second optical microstructures, a light source, an image capturing component, and a light control component. The first light beam emitted by the light source can be collimated to be transmitted to the first surface of the light assembly by the reflection of the at least one first reflecting surface of the first optical microstructure, so that the first light beam reflected by the object to be recognized is collimated Pass to the image capture component. With the second reflecting surface of the second optical microstructure, the second light beam emitted by the light source can be dispersed over a large range to allow the biometric device to have a sufficient working area. More importantly, with the refraction and reflection of the light control component, the direction of travel of the second beam that is originally transmitted obliquely toward the image capture assembly can be changed, and the second beam can be made after passing through the light control component. Pass directly to the image capture component. Thereby, the image quality of the biometric device is improved, thereby increasing the recognition capability of the biometric device.

Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present invention. range.

Claims

A biometric device, comprising:

a light guiding component having opposite first and second surfaces;

a plurality of first optical microstructures formed on the second surface of the light guiding component, wherein each of the first optical microstructures has at least one first reflecting surface;

a plurality of second optical microstructures formed on the second surface of the light guiding component, wherein each second optical microstructure has a second reflective surface;

a light source for emitting the first beam and the second beam;

An image capture assembly disposed relative to the second surface of the light guide assembly;

a light control component disposed between the plurality of second optical microstructures and the image capturing component, wherein the first light beam is the at least one first reflective surface of each of the first optical microstructures Reflecting to coordinately pass to the first surface of the light directing component; the second light beam being reflected by the second reflective surface of each of the second optical microstructures to be obliquely transmitted and Passing the first surface of the light guiding component to the object to be recognized, the second light beam is reflected by the object to be recognized to the light control component, and the light control component refracts and reflects the second light beam, so that The second beam is collimated to the image capture assembly.
The biometric device according to claim 1, wherein the at least one first reflecting surface comprises two first reflecting surfaces, and the two first reflecting surfaces are opposite to the first of the light guiding assemblies The surface is inclined, and the two first reflecting surfaces are oppositely inclined, wherein the first light beam is sequentially reflected by the two first reflecting surfaces of each optical microstructure to collimate The first surface of the light directing component is transferred.
The biometric device according to claim 1, wherein said at least first reflecting surface comprises a curved surface, wherein said first light beam is reflected by two different portions of said curved surface to collimate toward said light guiding light The first surface of the assembly is delivered.
The biometric device according to claim 1, wherein the first light beam is reflected by the object to be recognized after passing through the first surface of the light guiding component, and the image capturing component receives The first light beam reflected by the object to be recognized to obtain an image of the object to be recognized.
The biometric device according to claim 1, wherein the second reflecting surface is inclined with respect to the first surface of the light guiding assembly.
The biometric device according to claim 1, wherein said second reflecting surface Is a surface.
The biometric device according to claim 1, wherein the light control component comprises:

a plurality of microprisms each having a bottom surface and a plurality of sides, the plurality of sides being inclined with respect to the first surface of the light guiding assembly, the plurality of sides being inclined in opposite directions, the bottom surface being connected Between the plurality of sides, wherein the second light beam reflected by the object to be recognized is sequentially refracted by one of the plurality of sides, and reflected by the other of the plurality of sides by the bottom surface Exit.
The biometric device according to claim 7, wherein the image capturing assembly has a light receiving surface, and the second light beam emitted from the bottom surface is sandwiched by a reference axis perpendicular to the light receiving surface Angle θ, and -15 ° ≤ θ ≤ 15 °.
The biometric device according to claim 1, wherein the biometric device further comprises:

The light transmissive component is disposed on the first surface of the light guiding component, wherein the light transmissive component has a pressing surface for the object to be recognized to be pressed.
The biometric device according to claim 1, wherein the biometric device further comprises:

And a collimating component disposed between the second surface of the light guiding component and the image capturing component.
The biometric device according to claim 1, wherein the light guiding component further comprises:

An outer sidewall coupled to the first surface and extending toward a side of the second surface, wherein the first beam and the second beam enter the light guide assembly from the outer sidewall.
The biometric device according to claim 1, wherein the light guiding component further comprises:

An outer sidewall connected to the first surface and extending toward a side of the second surface;

An inner sidewall coupled to the second surface and disposed opposite the outer sidewall; and

a bottom surface disposed opposite the first surface and connected between the outer sidewall and the inner sidewall, wherein the first light beam and the second light beam enter from the bottom surface of the light guiding component In the light guiding component.
The biometric device according to claim 1, wherein said first light beam And the second light beam comprises visible light, invisible light, or a combination thereof.
The biometric device according to claim 1, wherein the object to be recognized comprises a fingerprint, a vein, a palm print or a combination of at least two of the foregoing.