TWM655926U - Optical fingerprint imaging device - Google Patents

Abstract

An optical fingerprint imaging device including a substrate, a photosensitive module, at least one light-emitting element, a hollow shell and a light-transmitting pressing plate is provided. The substrate extends along a reference plane. The photosensitive module is disposed on the substrate. The at least one light-emitting element is disposed on the substrate. The hollow shell is disposed on the substrate to surround the photosensitive module and the at least one light-emitting element. The hollow shell includes an outer wall portion and a first fitting portion extending inwardly from the outer wall portion and in a direction parallel to the reference plane. The first fitting portion includes a first fitting surface. The light-transmitting pressing plate is disposed on the first fitting surface, wherein the outer wall portion of the hollow shell surrounds the light-transmitting pressing plate and the substrate, the first fitting portion surrounds a light-passing area, and the area of ​​the light-transmitting pressing plate is larger than the area of ​​the light-passing area.

Description

Optical fingerprint imaging device

The present invention relates to a sensing device, and in particular to an optical fingerprint capturing device.

Nowadays, biometric devices are closely related to our daily lives. They replace the cumbersome process of password input and the inconvenience of being easily forgotten, and provide better security and convenience in the fields of security, confidentiality protection, cash payment, etc.

In the past, fingerprint recognition modules were mostly made of plastic shells, which only met the product appearance and the requirements of being installed in a larger module, resulting in insufficient reliability and strength of the fingerprint recognition module itself. In addition, in order to have a touch function, it is necessary to set up additional conductive components, which will make the manufacturing process more complicated.

The novel invention provides an optical fingerprint acquisition device, which can enhance structural strength, optimize packaging alignment, and beautify appearance.

The novel creation provides an optical fingerprint capturing device, including a substrate, a photosensitive module, at least one light-emitting element, a hollow shell, the light-emitting element and a light-transmitting pressure plate. The substrate extends along a reference plane. The photosensitive module is arranged on the substrate. At least one light-emitting element is arranged on the substrate. The hollow shell is arranged on the substrate to surround the photosensitive module and the at least one light-emitting element. The hollow shell includes an outer wall portion and a first engaging portion extending inward from the outer wall portion and in a direction parallel to the reference plane. The first engaging portion includes a first engaging surface. The light-transmitting pressure plate is arranged on the first engaging surface, wherein the outer wall portion of the hollow shell surrounds the light-transmitting pressure plate and the substrate, the first engaging portion surrounds the light-transmitting area, and the area of the light-transmitting pressure plate is larger than the area of the light-transmitting area.

In one embodiment of the present invention, the outer wall portion includes a top surface, the light-transmitting pressure plate includes a finger-pressing surface, and the shortest distance from the top surface to the reference plane is greater than the shortest distance from the finger-pressing surface to the reference plane.

In an embodiment of the present invention, the first engaging portion further includes a second engaging surface, and the substrate is disposed on the second engaging surface.

In one embodiment of the present novel creation, the outer wall portion includes a bottom surface, the substrate includes an outer surface, and the shortest distance from the bottom surface to the reference plane is greater than the shortest distance from the outer surface to the reference plane.

In an embodiment of the present invention, the hollow shell further comprises a second engaging portion extending inwardly from the outer wall portion and in a direction parallel to the reference plane, separated from the first engaging portion. The second engaging portion comprises a third engaging surface, and the substrate is disposed on the third engaging surface.

In an embodiment of the present invention, the number of the at least one light-emitting element is multiple, and the multiple light-emitting elements are arranged in a ring shape and evenly distributed around the photosensitive module.

In an embodiment of the present invention, the optical fingerprint capturing device further includes at least one light shielding element disposed on the substrate and located between the photosensitive module and at least one light emitting element.

In one embodiment of the present invention, the hollow shell is electrically connected to at least one of the substrate and the light-transmitting pressure plate.

In an embodiment of the present invention, at least one of the outer wall of the hollow shell, the light-transmitting pressure plate and the substrate comprises at least one air hole structure connected to the inner side and the outer side of the optical fingerprint capturing device.

Based on the above, in the optical fingerprint capturing device of the present invention, the hollow shell of the optical fingerprint capturing device includes an outer wall portion and a first interlocking portion extending inward from the outer wall portion and in a direction parallel to the reference plane. The outer wall portion of the hollow shell surrounds the light-transmitting pressure plate and the substrate, and the first interlocking portion includes a first interlocking surface, and the light-transmitting pressure plate of the optical fingerprint capturing device is arranged on the first interlocking surface of the first interlocking portion. Therefore, the light-transmitting pressure plate and the substrate can be combined in the hollow shell in an interlocking manner. In this way, the structural strength of the optical fingerprint capturing device can be improved, the packaging alignment can be optimized, and the appearance of the optical fingerprint capturing device can be beautified.

In order to make the above features and advantages of the present invention more clearly understood, an embodiment is given below and described in detail with reference to the accompanying drawings.

FIG1 is a cross-sectional schematic diagram of an optical fingerprint capturing device according to an embodiment of the present invention. Please refer to FIG1. The present embodiment provides an optical fingerprint capturing device 100 for capturing a user's finger for sensing to obtain an image containing the user's fingerprint signal. The optical fingerprint capturing device 100 includes a substrate 110, a photosensitive module 120, at least one light emitting element 130, a hollow housing 140, and a light-transmitting pressing plate 150.

The substrate 110 is, for example, a printed circuit board (PCB), a flexible printed circuit board (FPCB), a glass substrate with circuits, or a ceramic substrate with circuits, but the present invention is not limited thereto. The substrate 110 extends along the reference plane E.

The photosensitive module 120 is disposed on the substrate 110 and is electrically connected to the substrate 110. Specifically, in the present embodiment, the photosensitive module 120 includes, for example, a photosensitive element 122 and an image pickup lens set 124. The photosensitive element 122 is, for example, a charge coupled device (CCD), a complementary metal-oxide semiconductor (CMOS), or other appropriate types of image sensing elements, but the present invention is not limited thereto. The image pickup lens set 124 includes a combination of one or more optical lenses with refractive power, for example, various combinations of non-planar lenses such as biconcave lenses, biconvex lenses, concave-convex lenses, convex-concave lenses, plano-convex lenses, and plano-concave lenses, but the present invention is not limited thereto.

At least one light-emitting element 130 is disposed on the substrate 110 and electrically connected to the substrate 110 to provide an illumination beam to the user's finger. The at least one light-emitting element 130 is, for example, a light-emitting diode (LED), a laser diode (LD) or a vertical-cavity surface-emitting laser (VCSEL). In addition, the provided light beam may include visible light, non-visible light or a combination of the two. The non-visible light may be infrared light, but the novel creation is not limited to this. In the present embodiment, the number of at least one light-emitting element 130 may be designed to be multiple, and these light-emitting elements 130 are arranged in a ring shape and evenly distributed around the photosensitive module 120, but the novel creation is not limited to this.

In this embodiment, the optical fingerprint capturing device 100 may further include at least one shading element 160, which is disposed on the substrate 110 and located between the photosensitive module 120 and at least one light-emitting element 130, to reduce the appearance of stray light spots, thereby improving the optical quality of fingerprint capturing. The shading element 160 is, for example, a ring-shaped structure, and its top surface is higher than the top surface of the photosensitive module 120. The shading element 160, for example, includes a material or coating that is non-transparent to the light emission wavelength of the light-emitting element 130, but the present invention is not limited thereto.

The hollow shell 140 is disposed on the substrate 110 to surround the photosensitive module 120 and at least one light-emitting element 130. The hollow shell 140 includes an outer wall portion 142 and a first engaging portion 144 extending inward from the outer wall portion 142 and in a direction parallel to the reference plane E. The outer wall portion 142 of the hollow shell 140 surrounds the light-transmitting pressure plate 150 and the substrate 110. In other words, the light-transmitting pressure plate 150 and the substrate 110 are respectively assembled on opposite sides of the hollow shell 140 in an engaging manner to be packaged into a sealed structure. For example, the light-transmitting pressure plate 150 and the substrate 110 can be engaged with each other by means of slots, interference or gluing, etc., and the present novel creation is not limited thereto.

The light-transmitting pressing plate 150 is, for example, a light-transmitting flat plate including glass, polymethyl methacrylate, polycarbonate, polyvinyl alcohol, polyethylene terephthalate, polyolefin or any combination thereof, for the user to press against with a finger, but the present invention does not limit the type and optical conditions of the light-transmitting pressing plate 150. In detail, the first engaging portion 144 of the hollow shell 140 includes a first engaging surface S21, and the light-transmitting pressing plate 150 is disposed on the first engaging surface S21 of the first engaging portion 144. In the present embodiment, the first engaging surface S21 of the first engaging portion 144 faces a direction away from the substrate 110, but the present invention is not limited thereto. In other words, the first engaging portion 144 surrounds a light-transmitting area A, and the area of the light-transmitting pressing plate 150 is larger than the area of the light-transmitting area A. Therefore, the light-transmitting pressure plate 150 is disposed in the hollow housing 140 by means of an interlocking manner, and is connected to the first interlocking surface S21 of the first interlocking portion 144. In this way, the structural strength of the optical fingerprint capturing device 100 can be enhanced, the package alignment can be optimized, and the appearance of the optical fingerprint capturing device 100 can be beautified.

In more detail, the outer wall portion 142 of the hollow housing 140 includes a top surface S11, the light-transmitting pressure plate 150 includes a finger-pressing surface S3, and the shortest distance D1 from the top surface S11 of the outer wall portion 142 to the reference plane E is greater than the shortest distance D2 from the finger-pressing surface S3 of the light-transmitting pressure plate 150 to the reference plane E. Therefore, the light-transmitting pressure plate 150 is embedded in the hollow housing 140. On the other hand, the first embedding portion 144 further includes a second embedding surface S22, and the substrate 110 is disposed on the second embedding surface S22. In this embodiment, the second embedding surface S22 of the first embedding portion 144 faces a direction away from the light-transmitting pressure plate 150, but the present invention is not limited thereto. The outer wall portion 142 of the hollow housing 140 includes a bottom surface S12, the substrate 110 includes an outer surface S4, and the shortest distance D3 from the bottom surface S12 of the outer wall portion 142 to the reference plane E is greater than the shortest distance D4 from the outer surface S4 of the substrate 110 to the reference plane E. Therefore, the substrate 110 is also embedded in the hollow housing 140.

In addition, in this embodiment, the hollow housing 140 includes a conductive material and is electrically connected to at least one of the substrate 110 and the transparent pressure plate 150 to provide conductive properties. Therefore, the electrical change of the hollow housing 140 or the substrate 110 can trigger functional operations to achieve additional functional effects (for example, the electrical change triggers the touch function). In this way, there is no need to add additional conductive components, and the practicability of the optical fingerprint capture device 100 is improved while improving the process.

On the other hand, in the present embodiment, at least one of the outer wall portion 142 of the hollow housing 140 of the optical fingerprint capturing device 100, the light-transmitting pressure plate 150 and the substrate 110 may be designed to include at least one air hole structure H connected to the inner side and the outer side of the optical fingerprint capturing device 100, so as to balance the pressure on the inner side and the outer side of the optical fingerprint capturing device 100 when assembling the light-transmitting pressure plate 150 and the substrate 110, and the air hole structure H may be further sealed after the assembly is completed to achieve a completely sealed effect.

FIG2 is a cross-sectional schematic diagram of an optical fingerprint capturing device according to another embodiment of the present invention. Please refer to FIG2. The optical fingerprint capturing device 100A of the present embodiment is similar to the optical fingerprint capturing device 100 shown in FIG1. The difference between the two is that, in the present embodiment, the hollow shell 140A further includes a second interlocking portion 146 extending inward from the outer wall portion 142 and in a direction parallel to the reference plane E, separated from the first interlocking portion 144. The second interlocking portion 146 includes a third interlocking surface S23, and the substrate 110 is disposed on the third interlocking surface S23 of the second interlocking portion 146. In the present embodiment, the third interlocking surface S23 of the second interlocking portion 146 faces a direction away from the light-transmitting pressure plate 150, but the present invention is not limited thereto. In this way, the structural strength of the optical fingerprint capturing device 100A can be enhanced, the package alignment can be optimized, and the appearance of the optical fingerprint capturing device 100A can be beautified.

FIG. 3A to FIG. 3D are top views of the hollow shell of different embodiments of the present invention. Please refer to FIG. 1 and FIG. 3A to FIG. 3D. In the embodiment of FIG. 1, the outer wall portion 142 of the hollow shell 140 and the first interlocking portion 144 can be designed to be concentric circles, as shown in FIG. 3A. Alternatively, in another embodiment, the outer wall portion 142 of the hollow shell 140B can be designed to have an inner cut surface, as shown in FIG. 3B, to increase the positioning function of the light-transmitting pressure plate 150 when assembled. Furthermore, in another embodiment, the outer wall portion 142 of the hollow shell 140C can be designed to have a positioning groove, as shown in FIG. 3C, to further reduce the probability of assembly errors. Alternatively, in another embodiment, the outer wall portion 142 of the hollow shell 140D may be designed to have a plurality of positioning grooves, as shown in FIG3D , to ensure correct assembly. The above-mentioned actual assembly method may also be applied to assembling the substrate 110 , and the present invention is not limited thereto.

4A to 4C are schematic top views of the hollow shell of different embodiments of the present invention. Please refer to FIG. 1 and FIG. 4A to FIG. 4C. In another embodiment, the outer wall portion 142 of the hollow shell 140E and the first engaging portion 144 may be designed as concentric rectangles, as shown in FIG. 4A. Alternatively, in another embodiment, the outer wall portion 142 of the hollow shell 140F may be designed to have a positioning groove, as shown in FIG. 4B, to further reduce the probability of assembly errors. In addition, in another embodiment, the outer wall portion 142 of the hollow shell 140G and the first engaging portion 144 may also be designed as concentric polygons, as shown in FIG. 4C, and the present invention is not limited thereto.

In summary, in the optical fingerprint capturing device of the present invention, the hollow shell of the optical fingerprint capturing device includes an outer wall portion and a first interlocking portion extending inward from the outer wall portion and in a direction parallel to the reference plane. The outer wall portion of the hollow shell surrounds the light-transmitting pressure plate and the substrate, and the first interlocking portion includes a first interlocking surface, and the light-transmitting pressure plate of the optical fingerprint capturing device is arranged on the first interlocking surface of the first interlocking portion. Therefore, the light-transmitting pressure plate and the substrate can be combined in the hollow shell in an interlocking manner. In this way, the structural strength of the optical fingerprint capturing device can be enhanced, the packaging alignment can be optimized, and the appearance of the optical fingerprint capturing device can be beautified.

Although the novel creation has been disclosed as above by way of embodiments, they are not intended to limit the novel creation. Any person with ordinary knowledge in the relevant technical field may make slight changes and modifications without departing from the spirit and scope of the novel creation. Therefore, the protection scope of the novel creation shall be subject to the scope defined in the attached patent application.

100,100A: Optical fingerprint imaging device 110: Substrate 120: Photosensitive module 122: Photosensitive element 124: Image pickup lens assembly 130: Light emitting element 140,140A~140G: Hollow shell 142: Outer wall 144: First interlocking part 146: Second interlocking part 150: Transparent pressure plate 160: Shading element A: Light-transmitting area D1~D4: Shortest distance E: Reference plane H: Air hole structure S11: Top surface S12: Bottom surface S21: First interlocking surface S22: Second interlocking surface S23: Third interlocking surface S3: Finger pressure surface S4: Outer surface

FIG1 is a schematic cross-sectional view of an optical fingerprint imaging device of an embodiment of the present invention. FIG2 is a schematic cross-sectional view of an optical fingerprint imaging device of another embodiment of the present invention. FIG3A to FIG3D are schematic top views of hollow shells of different embodiments of the present invention. FIG4A to FIG4C are schematic top views of hollow shells of different embodiments of the present invention.

100: Optical fingerprint imaging device

110: Substrate

120: Photosensitive module

122: Photosensitive element

124: Imaging lens set

130: Light-emitting element

140: Hollow shell

142: Outer wall

144: First fitting part

150: Transparent pressure plate

160: Shading element

A: Light-transmitting area

D1~D4: Shortest distance

E: Reference plane

H: Porous structure

S11: Top

S12: Bottom

S21: First mating surface

S22: Second mating surface

S3: Finger pressure surface

S4: Outer surface

Claims (9)

An optical fingerprint capturing device comprises: a substrate extending along a reference plane; a photosensitive module disposed on the substrate; at least one light-emitting element disposed on the substrate; a hollow shell disposed on the substrate to surround the photosensitive module and the at least one light-emitting element, the hollow shell comprising an outer wall portion and a first engaging portion extending inward from the outer wall portion and in a direction parallel to the reference plane, the first engaging portion comprising a first engaging surface; and a light-transmitting pressure plate disposed on the first engaging surface, wherein the outer wall portion of the hollow shell surrounds the light-transmitting pressure plate and the substrate, the first engaging portion surrounds a light-transmitting area, and the area of the light-transmitting pressure plate is larger than the area of the light-transmitting area. An optical fingerprint acquisition device as described in claim 1, wherein the outer wall portion includes a top surface, the light-transmitting pressure plate includes a finger pressing surface, and the shortest distance from the top surface to the reference plane is greater than the shortest distance from the finger pressing surface to the reference plane. As described in claim 1, the optical fingerprint acquisition device, wherein the first embedding portion further includes a second embedding surface, and the substrate is configured on the second embedding surface. An optical fingerprint acquisition device as described in claim 1, wherein the outer wall portion includes a bottom surface, the substrate includes an outer surface, and the shortest distance from the bottom surface to the reference plane is greater than the shortest distance from the outer surface to the reference plane. An optical fingerprint acquisition device as described in claim 1, wherein the hollow shell further includes a second embedding portion extending inward from the outer wall portion and in a direction parallel to the reference plane, separated from the first embedding portion, and the second embedding portion includes a third embedding surface, and the substrate is configured on the third embedding surface. An optical fingerprint capturing device as described in claim 1, wherein the number of the at least one light-emitting element is multiple, and the multiple light-emitting elements are arranged in a ring shape and evenly distributed around the photosensitive module. The optical fingerprint imaging device as described in claim 1 further comprises: At least one light shielding element, disposed on the substrate and located between the photosensitive module and the at least one light emitting element. An optical fingerprint capturing device as described in claim 1, wherein the hollow shell is electrically connected to at least one of the substrate and the light-transmitting pressure plate. An optical fingerprint capturing device as described in claim 1, wherein at least one of the outer wall of the hollow shell, the light-transmitting pressure plate and the substrate includes at least one air hole structure connected to the inner side and the outer side of the optical fingerprint capturing device.

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