TWM552618U - Biometric identification apparatus - Google Patents

Abstract

A biometric identification apparatus including a light guide device, a light source used to emit a light beam and an image capture device is provided. The light guide device includes a top surface, a bottom surface disposed opposite to the top surface, a light incident surface connected between the bottom surface and the top surface, a first inner surface disposed opposite to the top surface and a second inner surface disposed opposite to the light incident surface and connected between the first inner surface and the bottom surface. The second inner surface is inclined with respect to the top surface and the light incident. The light beam entering the light guide device from the light incident surface is reflected toward the top surface by the second inner surface. The image capture device is disposed opposite to the first inner surface.

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 transmitted. The impact of components. Therefore, optical fingerprint recognition devices have also received much attention.

The optical fingerprint identification device comprises a light source, a light guiding component and an image capturing component. The light source is used to emit a light beam to illuminate a finger pressing the fingerprint recognition device. 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 converts the fingerprint image into a corresponding image signal and inputs the image signal to the processing unit. The processing unit may use an algorithm to calculate an image signal corresponding to the fingerprint for identification of the user. However, in the conventional fingerprint identification device, the efficiency of the light beam emitted from the light source coupled to the light guiding element is poor, resulting in low light utilization efficiency of the fingerprint identification device.

The novel creation provides a biometric device.

According to an embodiment of the present invention, the biometric device includes a light guiding element, a light source, a first optical glue, and an image capturing element. The light guiding element includes a top surface, a bottom surface, a light incident surface, a first inner surface, and a second inner surface. The bottom surface is disposed relative to the top surface. The light entrance surface is connected between the top surface and the bottom surface. The first inner surface is disposed relative to the top surface. The second inner surface is disposed relative to the light incident surface and is coupled between the first inner surface and the bottom surface. In particular, the second inner surface is inclined with respect to the top surface and the light incident surface. The light source is placed beside the entrance surface. There is a gap between the light source and the light incident surface. A first optical glue fills the gap. The light source is used to emit a light beam. The light beam is transmitted to the light incident surface through the first optical glue, and the light beam enters the light guiding element from the light incident surface and is reflected by the second inner surface toward the top surface. The image capture element is disposed relative to the first inner surface of the light guide element.

In the biometric device according to the embodiment of the present invention, the first inner surface and the second inner surface define grooves of the light guiding member, and the inner diameter of the groove gradually increases as it goes away from the top surface.

In the biometric device of the embodiment created in accordance with the present invention, the light guiding element further includes a third inner surface. The third inner surface is disposed relative to the light incident surface and is coupled between the second inner surface and the bottom surface. The first inner surface, the second inner surface, and the third inner surface define a groove. The second inner surface and the reference plane parallel to the top surface have a first angle, the third inner surface is inclined with respect to the top surface and the light incident surface and has a second angle with the reference plane, wherein the second angle is greater than the first angle.

In the biometric device according to the embodiment of the present invention, the first inner surface and the second inner surface define a groove of the light guiding element, and the image capturing element is disposed in the groove of the light guiding element.

In the biometric device according to the embodiment of the present invention, the refractive index of the first optical glue is the same as the refractive index of the light guiding element.

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 a top surface of the light guiding element.

In the biometric device according to the embodiment of the present invention, the biometric device further includes a second optical glue. The light guiding element is connected to the light transmitting element through the second optical glue.

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 first inner surface of the light guiding element and the image capturing element.

In the biometric device according to the embodiment of the present invention, the biometric device is used to identify the object to be identified, and the object to be recognized includes a fingerprint, a palm print, a vein, or a combination thereof.

In the biometric device according to the embodiment of the present invention, the light beam emitted by the light source includes visible light, invisible light, or a combination thereof.

Based on the above, the biometric device of the present invention includes a light guiding element, a light source, an optical glue, and an image capturing element. The light guiding element has a top surface, a bottom surface, a light incident surface, a first inner surface, and a second inner surface. The bottom surface is disposed relative to the top surface. The light entrance surface is connected between the top surface and the bottom surface. The first inner surface is disposed relative to the top surface. The second inner surface is disposed relative to the light incident surface and is coupled between the first inner surface and the bottom surface. In particular, the second inner surface is inclined with respect to the top surface and the light incident surface. The second inner surface is capable of reflecting more of the light beam on the top surface of the light guiding element, thereby illuminating the object to be recognized. Thereby, the light utilization efficiency of the biometric device can be improved.

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

Reference will now be made in detail to the exemplary embodiments of the embodiments herein 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 light source 120 , a first optical adhesive 130 , and an image capturing component 140 . The light guiding element 110 has a top surface 111, a bottom surface 112, a light incident surface 113, a first inner surface 114, and a second inner surface 115. The bottom surface 112 is disposed relative to the top surface 111. The light incident surface 113 is connected between the top surface 111 and the bottom surface 112. The first inner surface 114 is disposed relative to the top surface 111. The second inner surface 115 is disposed relative to the light incident surface 113 and is coupled between the first inner surface 114 and the bottom surface 112. In particular, the second inner surface 115 is inclined with respect to the top surface 111 and the light incident surface 113. In this embodiment, the top surface 111 and the bottom surface 112 may be parallel, and the light incident surface 113 and the top surface 111 may be perpendicular, but the novel creation is not limited thereto. The first inner surface 114 and the second inner surface 115 define a recess 110a of the light guiding element 110, and the inner diameter d of the recess 110a gradually increases away from the top surface 111. In the present embodiment, the light guiding element 110 also has a third inner surface 116. The third inner surface 116 is disposed relative to the light incident surface 113 and is coupled between the second inner surface 115 and the bottom surface 112. The first inner surface 114, the second inner surface 115, and the third inner surface 116 collectively define a recess 110a. The third inner surface 116 is inclined with respect to the top surface 111 and the light incident surface 113. Furthermore, the third inner surface 116 is sandwiched by a reference plane parallel to the top surface 111 with a second angle θ2, and the second inner surface 115 is sandwiched by a reference plane parallel to the top surface 111 with a first angle θ1, and a second The angle θ2 may be greater than the first angle θ1, 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.

The light source 120 is disposed beside the light incident surface 113 of the light guiding element 110. The light source 120 is used to emit the light beam L. In the present embodiment, the light beam L is, for example, invisible light (for example, infrared light). However, the novel creation is not limited thereto, and in other embodiments, the light beam L may also be visible light (for example, red light, blue light, green light, or a combination thereof) or a combination of visible light and invisible light. In the present embodiment, the light source 120 is, for example, a light emitting diode. However, the novel creation is not limited thereto, and in other embodiments, the light source 120 may be other suitable types of light-emitting elements. FIG. 1 shows two light sources 120 as an example, and the light sources 120 are disposed on opposite sides of the light guiding element 110. However, the novel creation is not limited thereto. In other embodiments, the number of the light sources 120 may be single and disposed on one side of the light guiding element 110, or the number of the light sources 120 may be three or more and disposed in the light guiding element. More than three sides of 110.

A gap G exists between the light source 120 and the light incident surface 113 of the light guiding element 110. The first optical glue 130 is filled in the gap G. The light beam L emitted from the light source 120 is transmitted to the light incident surface 113 through the first optical adhesive 130. The light beam L enters the light guiding element 110 from the light incident surface 113 and is reflected by the second inner surface 115 toward the top surface 111. Thereby, more light beams L can be transmitted in the light guiding element 110 to illuminate the object to be recognized 10, thereby improving the light utilization efficiency of the biometric device 100. In this embodiment, the refractive indices of the first optical adhesive 130 and the light guiding element 110 may be the same or similar to reduce the reflection of the light beam L at the boundary between the first optical adhesive 130 and the light guiding element 110 to enhance the biometric device 100. Light utilization efficiency and / or image quality. However, the novel creation is not limited thereto, and in other embodiments, the refractive indices of the first optical adhesive 130 and the light guiding element 110 may also be different.

The image capture element 140 is disposed relative to the first inner surface 114 of the light guide element 110. In detail, in the embodiment, the biometric device 100 further includes a circuit board 160. The image capturing component 140 can be disposed on the circuit board 160 and electrically connected to the circuit board 160. Further, in the embodiment, the image capturing component 140 can be disposed in the recess 110a of the light guiding component 110, and is located in the space surrounded by the recess 110a of the light guiding component 110 and the circuit board 160. However, this new creation is not limited to this. The image capturing component 140 has a plurality of pixel regions 142 arranged in an array to receive the light beam L 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 170. The light transmissive element 170 is disposed on the top surface 111 of the light guiding element 110. The light transmissive element 170 has a pressing surface 172 that is opposite to the light guiding element 110. The pressing surface 172 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 biological feature of a living being, such as a fingerprint, a vein, a palm print, or a combination of at least two of the above. 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 a second optical glue 180. The light transmissive element 170 can be connected to the top surface 111 of the light guiding element 110 through the second optical glue 180. In this embodiment, the refractive indices of the light transmissive element 170, the second optical adhesive 180, and the light guiding element 110 may be the same or similar to reduce the boundary between the light transmitting element 170 and the second optical adhesive 180 and the second optical The reflection of the junction of the glue 180 and the light guiding element 110 to enhance the light utilization efficiency and/or image quality of the biometric device 100. However, the novel creation is not limited thereto. In other embodiments, the refractive indices of the light transmissive element 170, the second optical paste 180, and the light guiding element 110 may also be different.

In the present embodiment, the biometric device 100 can also include a collimating element 150. The collimating element 150 is disposed between the first inner surface 114 of the light guiding element 110 and the image capturing element 140. In this embodiment, the collimating element 150 can be connected to the image capturing element 140 through an optical glue (not shown), but the novel creation is not limited thereto. It is noted that the collimating element 150 has a plurality of light transmissive regions 152. The plurality of light transmissive regions 152 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 the corresponding one of the light transmitting regions 152, 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 may optionally not include the collimating element 150.

In summary, the biometric device of the present invention includes a light guiding component, a light source, an optical glue, and an image capturing component. The light guiding element has a top surface, a bottom surface, a light incident surface, a first inner surface, and a second inner surface. The bottom surface is disposed relative to the top surface. The light entrance surface is connected between the top surface and the bottom surface. The first inner surface is disposed relative to the top surface. The second inner surface is disposed relative to the light incident surface and is coupled between the first inner surface and the bottom surface. In particular, the second inner surface is inclined with respect to the top surface and the light incident surface. The second inner surface is capable of reflecting more of the light beam on the top surface of the light guiding element, thereby illuminating the object to be recognized. Thereby, the light utilization efficiency of the biometric device can be improved.

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
110a‧‧‧ Groove
111‧‧‧ top surface
112‧‧‧ bottom
113‧‧‧Into the glossy surface
114‧‧‧First inner surface
115‧‧‧Second inner surface
116‧‧‧ Third inner surface
120‧‧‧Light source
130‧‧‧First optical adhesive
140‧‧‧Image capture component
142‧‧‧Pixel area
150‧‧‧ collimating components
152‧‧‧Light transmission area
160‧‧‧ boards
170‧‧‧Lighting components
172‧‧‧ Pressing surface
180‧‧‧Second optical adhesive
d‧‧‧Inner diameter
G‧‧‧ gap
L‧‧‧beam θ1‧‧‧first angle θ2‧‧‧second angle

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

10‧‧‧To be identified

100‧‧‧Biometric device

110‧‧‧Light guiding elements

110a‧‧‧ Groove

111‧‧‧ top surface

112‧‧‧ bottom

113‧‧‧Into the glossy surface

114‧‧‧First inner surface

115‧‧‧Second inner surface

116‧‧‧ Third inner surface

120‧‧‧Light source

130‧‧‧First optical adhesive

140‧‧‧Image capture component

142‧‧‧Pixel area

150‧‧‧ collimating components

152‧‧‧Light transmission area

160‧‧‧ boards

170‧‧‧Lighting components

172‧‧‧ Pressing surface

180‧‧‧Second optical adhesive

d‧‧‧Inner diameter

G‧‧‧ gap

L‧‧‧beam

θ 1‧‧‧ first angle

θ 2‧‧‧second angle

Claims (11)

A biometric device includes: a light guiding element, comprising: a top surface; a bottom surface disposed opposite to the top surface; a light incident surface coupled between the top surface and the bottom surface; the first inner surface, relative to The top surface is disposed; and the second inner surface is disposed relative to the light incident surface and connected between the first inner surface and the bottom surface, wherein the second inner surface is opposite to the top surface The light incident surface is inclined; a light source is disposed beside the light incident surface, wherein the light source is configured to emit a light beam, and the light beam enters the light guiding element from the light incident surface and is the second inner surface Reflecting toward the top surface; and image capturing elements disposed relative to the first inner surface of the light guiding element. The biometric device of claim 1, wherein there is a gap between the light source and the light incident surface, the biometric device further comprising: a first optical glue filled in the gap, wherein The light beam is transmitted to the light incident surface through the first optical glue. The biometric device of claim 1, wherein the first inner surface and the second inner surface define a groove of the light guiding element, and an inner diameter of the groove is away from The top is growing. The biometric device of claim 3, wherein the light guiding element further comprises: a third inner surface disposed opposite to the light incident surface and connected to the second inner surface and the bottom surface The first inner surface, the second inner surface, and the third inner surface define the groove, and the second inner surface has a first angle with a reference plane parallel to the top surface The third inner surface is inclined with respect to the top surface and the light incident surface and has a second angle with the reference plane, wherein the second angle is greater than the first angle. The biometric device of claim 1, wherein the first inner surface and the second inner surface define a groove of the light guiding element, and the image capturing element is disposed on the guiding In the groove of the light element. The biometric device of claim 1, wherein there is a gap between the light source and the light incident surface, the biometric device further comprising: a first optical glue filled in the gap, wherein The light beam is transmitted to the light incident surface through the first optical glue, and the refractive index of the first optical glue is the same as the refractive index of the light guiding element. The biometric device of claim 1, further comprising: a light transmissive element disposed on the top surface of the light guiding element. The biometric device of claim 7, further comprising: a second optical glue, wherein the light guiding element is connected to the light transmissive element through the second optical glue. The biometric device of claim 1, further comprising: a collimating element disposed between the first inner surface of the light guiding element and the image capturing element. The biometric device of claim 1, wherein the biometric device is configured to identify an object to be identified, and the object to be recognized includes a fingerprint, a palm print, a vein, or a combination thereof. The biometric device of claim 1, wherein the light beam emitted by the light source comprises visible light, invisible light, or a combination thereof.