TWM555505U - Biometric identification apparatus - Google Patents

Abstract

A biometric identification apparatus including a light guide device having a first surface and a second surface opposite to each other, first optical micro structures formed on the second surface, second optical micro structures formed on the second surface, a light source used to emitted a first light beam and a second light beam, an image capture device and a light control device disposed between the second micro structures and the image capture device is provided. The first light beam is reflected by a first reflective surface of each of the first optical micro structures to be collimatedly transmitted toward the first surface of the light guide device. The second light beam is reflected by a second surface of each of the second micro structures to be obliquely transmitted and passed through the first surface of the light guide device to an unknown object. The second light beam is reflected to the light control device by the unknown object. The second light beam is refracted and reflected by the light control device to be collimatedly transmitted toward the image capture device.

Description

Biometric device

The present invention relates to an optoelectronic device, and more particularly to a biometric device.

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 element. Finger fingerprints are made up of a number of irregular ridges and indentations. The beams reflected by the ridges and the indentations form a fingerprint image that is interlaced on the receiving surface of the image capturing element. The image capturing component can convert the fingerprint image into corresponding image information and Like information is input to the processing unit. The processing unit may calculate the image information corresponding to the fingerprint by using an algorithm to perform identity recognition 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 recognition result.

The novel creation provides a biometric device.

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

In the biometric device according to the embodiment of the present invention, at least one The 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 element, and the tilting directions of the two first reflecting surfaces are opposite, wherein the first light beam is sequentially replaced by each The two first reflective surfaces of an optical microstructure are reflected to collimate to direct the first surface of the light element.

In the biometric device of the 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 element.

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 element, and the image capturing element receives the first light beam reflected by the object to be recognized to obtain An image of the object to be identified.

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

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 the embodiment of the present invention, the light control element 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 element, 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.

θ

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

θ

15°.

In the biometric device according to the embodiment of the present invention, the biometric device further includes a light transmissive element. The light transmissive element is disposed on the first surface of the light guiding element. The light transmissive element has a pressing surface for pressing the object to be recognized.

In the biometric device of the embodiment created in accordance with the present invention, the biometric device further includes a collimating element. The collimating element is disposed between the second surface of the light guiding element and the image capturing element.

In the biometric device according to the embodiment of the present invention, the light guiding element 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 guiding element from the outer sidewall.

In the biometric device according to the embodiment of the present invention, the light guiding element 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 element from the bottom surface of the light guiding element.

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

In the biometric device according to the 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 foregoing.

Based on the above, the biometric device of the present invention includes a light guiding element, a plurality of first optical microstructures, a plurality of second optical microstructures, a light source, an image capturing element, and a light control element. The first light beam emitted by the light source can collimate the first surface of the light element by reflection of the at least one first reflecting surface of the first optical microstructure The first beam that is reflected by the object to be recognized is transmitted to the image capturing element in a collimated manner. 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 element, the direction of travel of the second light beam originally transmitted obliquely toward the image capturing element can be changed, and the second light beam can be made after passing through the light control element. Straight to the image capture component. Thereby, the image quality of the biometric device is improved, thereby increasing the recognition capability of the biometric device.

The above described features and advantages of the present invention will become more apparent and understood from the following description.

10‧‧‧To be identified

100, 100A, 100B, 100C‧‧‧ biometric devices

110‧‧‧Light guiding elements

112‧‧‧ first surface

113‧‧‧ Groove

114‧‧‧ second surface

116‧‧‧Outer side wall

118‧‧‧ inner side wall

119‧‧‧ bottom

119a‧‧‧ dent

122, 122C‧‧‧First optical microstructure

122a, 122b‧‧‧ first reflective surface

122c, 124c‧‧‧ surface

124, 124C‧‧‧Second optical microstructure

124a‧‧‧second reflecting surface

124b‧‧‧ connection surface

130‧‧‧Light source

140‧‧‧Image capture component

142‧‧‧Pixel area

150‧‧‧Light control components

152‧‧‧Microprism

152a‧‧‧ bottom

152b, 152c‧‧‧ side

160‧‧‧Lighting components

162‧‧‧ pressing surface

170, 192, 194, 198‧ ‧ optical glue

180‧‧‧ collimating components

184‧‧‧Lighting area

196‧‧‧ boards

199‧‧‧Support

L1‧‧‧first beam

L2‧‧‧second beam

X‧‧‧ reference axis

‧‧‧‧prism angle

θ ‧‧‧Output angle

θ '‧‧‧ angle

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

FIG. 2 illustrates a process in which the light control element of the present embodiment and the second light beam reflected by the object to be recognized are transmitted through the light guiding element and the light control element to enter the image capturing element.

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

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

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

Reference will now be made in detail to the exemplary embodiments of the present invention. Examples of the examples are illustrated in the drawings. Wherever possible, the same element symbols are used in the FIGS.

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 . Light directing element 110 has opposing first surface 112 and second surface 114. In this embodiment, the light guiding element 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 can define the groove 113, but the novel creation is not limited thereto. In this embodiment, the material of the light guiding element 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 guiding element 110. In this embodiment, the material of the first optical microstructure 122 and the material of the light guiding element 110 may be the same. In other words, the first optical microstructure 122 and the light guiding element 110 may be integrally formed. However, the novel creation is not limited thereto. In other embodiments, the first optical microstructure 122 and the light guiding element 110 may also be separately fabricated, and then the first optical microstructure 122 may be disposed in the second of the light guiding element 110. On the surface 114. 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 present embodiment, each of the first optical microstructures 122 There is a first reflecting surface 122a and a second reflecting 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 element 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 novel creation 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 do not have to be The planes (for example, two first reflecting surfaces 122a, 122b) are composed.

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 this 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 novel creation is not limited to Therefore, 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 an embodiment, 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 novel creation is not limited thereto, and in other embodiments, the light source 130 may be other suitable types of light-emitting elements. FIG. 1 shows a light source 130 as an example, and the light source 130 is disposed on one side of the light guiding element 110. However, the novel creation is not limited thereto. In other embodiments, the number of the light sources 130 may also be plural, and/or the light source 130 may also be disposed at the light guide. Two sides or more than three sides of the element 110.

In this embodiment, the first light beam L1 and the second light beam L2 may enter the light guiding element 110 from the bottom surface 119 of the light guiding element 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 guiding element 110 can be fixed to the circuit board 196. The bottom surface 119 of the light guiding element 110 may 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 element 110 from the recess 119a. However, the novel creation is not limited thereto. In another embodiment, the bottom surface 119 of the light guiding element 110 may have no recess 119a, the circuit board 196 may have a recess (not shown), and the light source 130 may be disposed on the circuit board 196. In the recess, the bottom surface 119 of the light guiding element 110 is disposed above the recess of the circuit board 196, and the first light beam L1 and the second light beam L2 may also enter the light guiding element 110 from the bottom surface 119 without the recess 119a. 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 element 110 are only used to illustrate the novel creation and not to limit the creation of the novel. In other embodiments, The light source 130 can also be disposed at other suitable positions, and the first light beam L1 and the second light beam L2 can also enter the light guiding element 110 from other regions of the light guiding element 110.

The image capture component 140 is disposed relative to the second surface 114 of the light guide component 110. In detail, in this 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 element 110 may define a recess 113, and the image capturing component 140 may be disposed in the recess 113 of the light guiding component 110. But this New creations are not limited to this. 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.

In the present embodiment, the biometric device 100 further includes a light transmissive element 160. The light transmissive element 160 is disposed on the first surface 112 of the light guiding element 110. The light transmissive element 160 has a pressing surface 162 that faces the light guiding element 110. The pressing surface 162 is pressed by the object to be recognized 10. In this 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 body (eg, a fingerprint, a palm print, or at least two of the above). Combinations, etc., or biological characteristics of the interior and exterior of the organism. However, the novel creation 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 element 160 is connectable to the first surface 112 of the light guiding element 110 through the optical glue 170. In this embodiment, the refractive indices of the light transmissive element 160, the optical adhesive 170, and the light guiding element 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 element 160 and the optical adhesive 170. The reflection of the boundary between the optical glue 170 and the light guiding element 110 further enhances the light utilization efficiency and/or image quality of the biometric device 100. However, the novel creation is not limited thereto, and in other embodiments, the refractive indices of the light transmissive element 160, the optical glue 170, and the light guiding element 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 guiding elements. The first surface 112 of 110 is passed. In other words, through the reflection of the first optical microstructure 122, the incident angle of the first light beam L1 entering the first surface 112 may be 0 degrees or close to 0 degrees (for example, -15 degrees to +15 degrees), wherein The direction of the normal of the first surface 112 to the first light beam L1 is clockwise, then the incident angle is a negative value; if the direction from the normal of the first surface 112 to the direction of the first light beam L1 is counterclockwise, then The incident angle is a positive value). 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 element 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 light guiding element 162 of the light transmitting element 160 and passes through the light guiding element 110 to enter the image capturing element 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 guiding element 110. In this embodiment, the material of the second optical microstructure 124 and the material of the light guiding element 110 may be the same. In other words, the second optical microstructure 124 and the light guiding element 110 may be integrally formed. However, the novel creation is not limited thereto, and in other embodiments, The second optical microstructure 124 and the light guiding element 110 can also be separately fabricated, and then the second optical microstructure 124 can be disposed on the second surface 114 of the light guiding element 110. 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 element 110, but the novel creation 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 the present embodiment, the connecting surface 124b can be inclined with respect to the first surface 112 of the light guiding element 110, and the oblique direction of the connecting surface 124b and the second reflecting surface 124a can be opposite. However, the novel creation is not limited thereto, and in other embodiments, the connecting surface 124b may also be designed in other suitable forms.

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

The light control element 150 is disposed between the plurality of second optical microstructures 124 and the image capturing element 140. In this embodiment, the light control element 150 may not be disposed between the plurality of first optical microstructures 122 and the image capturing component 140, but the novel creation is not limited thereto. In the present embodiment, the biometric device 100 further includes an optical glue 192, and the light control element 150 is selectively coupled to the second optical microstructure 124 through the optical adhesive 192. However, the novel creation is not limited thereto, and in other embodiments, the light control element 150 may also be secured between the plurality of second optical microstructures 124 and the image capturing element 140 by other means. For example, in another embodiment, the light control element 150 can also be fixed on the inner sidewall 118 of the light guiding component 110 by using a fixing component (not shown), and is not necessarily 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 transmitted obliquely and through the first surface 112 of the light guiding element 110 to To be identified 10 . The second light beam L2 passes through the first surface 112 of the light guiding element 110 and is then reflected by the object to be recognized 10 to the light control element 150, wherein the reflection includes diffuse reflection. In particular, the light control element 150 refracts and reflects the second light beam L2 such that the second light beam L2 is collimated to the image capture element 140. The mechanism by which the light control element 150 refracts and reflects the second light beam L2 will be exemplified below using FIG.

2 shows a process in which the light control element 150 of the embodiment of the present invention and the second light beam L2 reflected by the object to be recognized 10 are transmitted through the light guiding element 110 and the light control element 150 to enter the image capturing element 140. Referring to FIGS. 1 and 2, the light control element 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 with respect to the first surface 112 of the light guiding element 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 element 110. Will obliquely enter the side surface 152b of the light control element 150, and the second light beam L2 is microribbed The side surface 152b of the mirror 152 is refracted and transmitted to the other side surface 152c of the microprism 152, and the side surface 152c of the microprism 152 reflects the second light beam L2 such that the second light beam L2 is emitted from the bottom surface 152a and transmitted to the image capturing element 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 guiding element 110, thereby obliquely entering and pressing. Face 162 is dispersed over a larger 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 element 140 before entering the light control element 150. However, with the refraction and reflection of the light control element 150, the direction of transmission of the second light beam L2 can be changed, and the second light beam L2 can be collimated to the image capturing element 140 after passing through the light control element 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 of the microprisms 152 of the light control element 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 element 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 element 110 and does not enter the light control element 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 emitted from the bottom surface 152a and the reference axis X). The exit angle θ and the angle θ ' satisfy the following relationship:

θ

15°，其中若由底面152a的法綫到第二光束L2的方向為順時針方向，則所述入射角為負值，若由底面152a的法綫到第二光束L2的方向為逆時針方向，則所述入射角為正值)。藉此，第二光束L2可準直地向影像擷取元件140傳遞，進而使影像擷取元件140取得良好的待辨識物10影像，提高生物辨識裝置100的辨識能力。 With the above relational expression, 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-light control element 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, 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 10 to be recognized, thereby improving the recognition capability of the biometric device 100.

In the present embodiment, the biometric device 100 can also include a collimating element 180. The collimating element 180 is disposed between the second surface 114 of the light guiding element 110 and the image capturing element 140. In detail, in the present embodiment, the collimating element 180 can be disposed between the plurality of first optical microstructures 122 and the image capturing elements 140 and between the plurality of second optical microstructures 124 and the image capturing elements 140. However, this new creation is not limited to this. For example, the biometric device 100 further includes an optical glue 194, and the collimating element 180 can be connected to the image capturing element 140 through the optical adhesive 194, but the novel creation is not limited thereto. It is noted that the collimating element 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 novel creation is not limited thereto, and in other embodiments, the biometric device 100 is also optional. The collimating element 180 is alternatively included.

3 is a schematic cross-sectional view showing 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 element 110, and the first beam L1 and the second beam L2 can enter the light guiding element 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 schematic cross-sectional view of 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 element 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 guiding element 110, the circuit board 196 or the light source 130, or be a member other than the light guiding element 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 element 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 element 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 showing a biometric device according to still another embodiment of the present invention; intention. 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 element 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 light guiding element 162 of the light transmitting element 160 and passes through the light guiding element 110 to enter the image capturing element 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 and transmitted obliquely and through the first surface 112 of the light guiding element 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 element 160 and the light guiding element 110, and then enters the light control element 150 obliquely. The light control element 150 refracts and reflects the second light beam L2 such that the second light beam L2 is collimated to the image capturing element 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 novel creation 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 and FIG. Or the biometric device of the first optical microstructure 122 of FIG. 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 of the present 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 guide the first surface of the light element 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 element, the direction of travel of the second light beam originally transmitted obliquely toward the image capturing element can be changed, and the second light beam can be made after passing through the light control element. Straight to the image capture component. Thereby, the image quality of the biometric device is improved, thereby increasing the recognition capability of the biometric device.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the novel creation, and any person skilled in the art can make some changes without departing from the spirit and scope of the novel creation. Retouching, the scope of protection of this new creation is subject to the definition of the scope of the patent application attached.

10‧‧‧To be identified

100‧‧‧Biometric device

110‧‧‧Light guiding elements

112‧‧‧ first surface

113‧‧‧ Groove

114‧‧‧ second surface

116‧‧‧Outer side wall

118‧‧‧ inner side wall

119‧‧‧ bottom

119a‧‧‧ dent

122‧‧‧First optical microstructure

122a, 122b‧‧‧ first reflective surface

122c‧‧‧ surface

124‧‧‧Second optical microstructure

124a‧‧‧second reflecting surface

124b‧‧‧ connection surface

130‧‧‧Light source

140‧‧‧Image capture component

142‧‧‧Pixel area

150‧‧‧Light control components

160‧‧‧Lighting components

162‧‧‧ pressing surface

170,192,194‧‧‧Optical adhesive

180‧‧‧ collimating components

184‧‧‧Lighting area

196‧‧‧ boards

L1‧‧‧first beam

L2‧‧‧second beam

Claims (14)

A biometric device comprising: a light guiding element having opposite first and second surfaces; a plurality of first optical microstructures formed on the second surface of the light guiding element, wherein each first optical The microstructure has at least one first reflective surface; a plurality of second optical microstructures are formed on the second surface of the light guiding element, wherein each second optical microstructure has a second reflective surface; Generating a first beam and a second beam; an image capturing element disposed relative to the second surface of the light guiding element; and a light control element disposed on the plurality of second optical microstructures and the image Between the elements, wherein the first light beam is reflected by the at least one first reflective surface of each of the first optical microstructures to be collimated to the first surface of the light guiding element; The second light beam is reflected by the second reflective surface of each of the second optical microstructures to be obliquely transmitted and passed through the first surface of the light guiding element to an object to be recognized, the Two beams are reflected by the object to be recognized to the light control Member, the reflection and refraction of the light control element of the second beam, such that the second beam element is transmitted to the collimated image capture. The biometric device of 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 elements The surface is inclined, and the two first reflecting surfaces are inclined in opposite directions, wherein the first light beam is sequentially referred to by each of the first optical micro The two first reflecting surfaces of the structure are reflected to be collimated to the first surface of the light guiding element. The biometric device of claim 1, wherein the at least first reflective surface comprises a curved surface, wherein the first light beam is reflected by two different portions of the curved surface to collimate toward the light guide The first surface of the element is transferred. The biometric device of claim 1, wherein the first light beam passes through the first surface of the light guiding element and is reflected by the object to be recognized, and the image capturing element 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 of claim 1, wherein the second reflecting surface is inclined with respect to the first surface of the light guiding element. The biometric device of claim 1, wherein the second reflecting surface is a curved surface. The biometric device of claim 1, wherein the light control element comprises: a plurality of microprisms, each microprism having a bottom surface and a plurality of side surfaces, the plurality of side surfaces being opposite to the light guiding element The first surface is inclined, the plurality of sides are inclined in opposite directions, and the bottom surface is connected between the plurality of sides, wherein the second light beam reflected by the object to be recognized is sequentially One of the plurality of sides is refracted and reflected by the other of the plurality of sides to be emitted from the bottom surface. The biometric device of claim 7, wherein the image capturing element 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 of claim 1, further comprising: a light transmissive element disposed on the first surface of the light guiding element, wherein the light transmissive element has a pressing surface for the The object to be identified is pressed. The biometric device of claim 1, further comprising: a collimating element disposed between the second surface of the light guiding element and the image capturing element. The biometric device of claim 1, wherein the light guiding element further has: an outer sidewall connected to the first surface and extending toward a side of the second surface, wherein the first light beam And the second light beam enters the light guiding element from the outer sidewall. The biometric device of claim 1, wherein the light guiding element further has: an outer sidewall connected to the first surface and extending toward a side of the second surface; an inner sidewall, and the a second surface is coupled to and disposed opposite the outer sidewall; and a bottom surface disposed opposite the first surface and coupled between the outer sidewall and the inner sidewall, wherein the first beam and The second light beam enters the light guiding element from the bottom surface of the light guiding element. The biometric device of claim 1, wherein the first light beam and the second light beam comprise visible light, invisible light, or a combination thereof. The biometric device of claim 1, wherein the object to be identified comprises a fingerprint, a vein, a palm print, or a combination of at least two of the foregoing.