Optical fingerprint module with double-sided golden fingers

Abstract

The invention discloses an optical fingerprint module with double-sided golden fingers, and relates to the field of fingerprint modules, the optical fingerprint module comprises a flexible circuit board, a fingerprint sensor and at least one light emitting diode are installed on the flexible circuit board, the flexible circuit board is provided with a plugging end, the two surfaces of the plugging end are both provided with golden fingers, and the multiple golden fingers are arranged at intervals to form a row of golden fingers. The plugging end is provided with a limiting structure; the golden fingers are arranged on the two surfaces of the plugging end on the flexible circuit board, so that the conductivity and the wear resistance are enhanced, the loss caused by frequent plugging can be effectively reduced, the long-time stable work is ensured, the service life of the module is prolonged, reliable electrical contact can be provided for each connection, and the service life of the module is prolonged. Reliability and stability of products are improved, space is effectively saved, cost is reduced, the application range is flexible, the limiting structure can ensure that the golden fingers are placed in place, alignment deviation is avoided, and the requirements of modern application can be met.

Description

Technical Field

[0001] The invention relates to the technical field of fingerprint modules, and in particular to an optical fingerprint module with a double-sided gold finger. Background Art

[0002] With the rapid development of mobile devices, smart homes, security monitoring and other fields, fingerprint recognition technology has become one of the important means of identity authentication. As a common fingerprint recognition technology, the optical fingerprint recognition module works by capturing fingerprint images through optical sensors and processing the images through algorithms to identify the user's identity. Optical fingerprint recognition modules are widely used in smart phones, laptops, access control systems, financial payments and other fields.

[0003] Patent application number CN201821861281.X discloses an optical fingerprint module, which includes a flexible circuit board, the first frame, the fingerprint sensor and the at least one light-emitting diode are arranged on the upper surface of one end of the flexible circuit board, and a connector is arranged at the other end of the flexible circuit board. Patent application number CN202020095627.0 discloses an under-screen ultra-thin optical fingerprint module packaging structure, the optical fingerprint module includes a fingerprint recognition chip for converting an optical signal into an electrical signal, the under-screen ultra-thin optical fingerprint module packaging structure includes a flexible circuit board, the flexible circuit board has a hollow area, the front of the flexible circuit board is arranged toward the display screen, the back of the flexible circuit board is arranged away from the display screen, and a reinforcement plate is fixed to the back of the corresponding hollow area and the flexible circuit board, the optical fingerprint module is formed in the hollow area and fixed on the reinforcement plate, and the front of the flexible circuit board is also provided with a hollow plastic sealing sheet, the inner periphery of the plastic sealing sheet covers the outer peripheral edge of the fixed optical fingerprint module to encapsulate the optical fingerprint module. Both of the above-mentioned optical fingerprint modules are connected to external circuits using connectors.

[0004] Traditional optical fingerprint modules are mainly electrically connected to external circuits through plug-in connectors. However, during long-term use, the plug-in connector is prone to poor connection, unstable contact, and even interface loss due to friction due to the increase in the number of plug-in and unplugging times, which affects the performance and service life of the fingerprint recognition module. In addition, the connection conductivity of the connector is poor and it occupies a large volume. In addition, with the widespread application of optical fingerprint modules, the market has higher and higher requirements for the life, stability, and performance of the module. Traditional plug-in connectors can no longer meet the needs of modern applications. Therefore, the present invention discloses an optical fingerprint module with double-sided gold fingers to solve the above problems. Summary of the invention

[0005] Based on this, it is necessary to provide an optical fingerprint module with double-sided gold fingers to address the above-mentioned technical problems. By setting gold fingers on both surfaces of the plug-in end on the flexible circuit board, the conductivity and wear resistance are enhanced, the service life of the module is extended, the reliability and stability of the product are improved, space is effectively saved, costs are reduced, the scope of use is flexible, and the limiting structure avoids alignment deviation, which can meet the needs of modern applications.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: An optical fingerprint module with double-sided gold fingers comprises a flexible circuit board, on which a fingerprint sensor and at least one light-emitting diode are mounted, the flexible circuit board is provided with a plug-in end, both surfaces of the plug-in end are provided with gold fingers, a plurality of gold fingers are arranged at intervals to form a row of gold fingers, and the plug-in end is provided with a limiting structure.

[0007] As a preferred embodiment of the optical fingerprint module with double-sided gold fingers provided by the present invention, the fingerprint sensor includes a fingerprint recognition chip mounted on a flexible circuit board, the fingerprint recognition chip has a built-in sensor, and a filter is provided on the surface of the fingerprint recognition chip.

[0008] As a preferred embodiment of the optical fingerprint module with double-sided gold fingers provided by the present invention, the flexible circuit board also includes a flexible main body and a connecting section, the main body is connected to the plug-in end through the connecting section, and the plug-in end is made of hard material.

[0009] As a preferred embodiment of the optical fingerprint module with double-sided gold fingers provided by the present invention, the fingerprint sensor and the light-emitting diode are both installed on the front side of the main body, and a reinforcing plate is provided on the back side of the main body.

[0010] As a preferred implementation of the optical fingerprint module with double-sided gold fingers provided by the present invention, the gold fingers on the two surfaces of the plug-in end are arranged in a one-to-one correspondence.

[0011] As a preferred implementation of the optical fingerprint module with double-sided gold fingers provided by the present invention, the limiting structure is a protrusion extending out from the side of the plug-in end.

[0012] As a preferred embodiment of the optical fingerprint module with double-sided gold finger provided by the present invention, there are two protrusions which are respectively arranged on both sides of the plug-in end, and the two sides of the two protrusions facing the gold finger are in the same straight line.

[0013] As a preferred embodiment of the optical fingerprint module with double-sided gold fingers provided by the present invention, it also includes a shell, which is fixed on the flexible circuit board and the fingerprint sensor and the light-emitting diode are both located in the shell. The shell is located on the raised part above the fingerprint sensor, and the raised part is provided with a lens.

[0014] As a preferred embodiment of the optical fingerprint module with double-sided gold fingers provided by the present invention, it also includes a transparent cover, which covers the outer side of the raised portion and is bonded and fixed to the shell through an adhesive layer.

[0015] As a preferred embodiment of the optical fingerprint module with double-sided gold fingers provided by the present invention, the transparent cover is provided with diagonally arranged positioning grooves, and the housing is provided with positioning columns matching the positioning grooves.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The optical fingerprint module with double-sided gold fingers provided by the present invention realizes fingerprint recognition through the light-emitting diodes and fingerprint sensors installed on the flexible circuit board. Gold fingers are arranged on both surfaces of the plug-in end of the flexible circuit board, which enhances conductivity and wear resistance, can effectively reduce the loss caused by frequent plugging and unplugging, ensure long-term stable operation, extend the service life of the module, ensure that each connection can provide reliable electrical contact, improve the reliability and stability of the product, effectively save space, reduce costs, and have a flexible scope of use. The limiting structure can ensure that the gold fingers are placed in place to avoid alignment deviation, and can meet the needs of modern applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the scheme of the present invention, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A three-dimensional schematic diagram of the overall structure of the optical fingerprint module with double-sided gold fingers provided by the present invention; Figure 2 A schematic side view of the overall structure of the optical fingerprint module with double-sided gold fingers provided by the present invention; Figure 3 This is a schematic diagram of the overall structure of the optical fingerprint module with double-sided gold fingers provided by the present invention; Figure 4 for Figure 2 AA section diagram Figure 5 This is a schematic diagram of the overall structure of the optical fingerprint module with double-sided gold fingers provided by the present invention; Figure 6 A schematic diagram of the structure of a flexible circuit board in an optical fingerprint module with double-sided gold fingers provided by the present invention; Figure 7 for Figure 6 Schematic diagram from another perspective; Figure 8 This is a schematic diagram of the use of the optical fingerprint module with double-sided gold fingers provided by the present invention.

[0019] The markings in the figure are as follows: 1. Flexible circuit board; 101. Main body; 102. Connecting section; 103. Plug-in terminal; 2. Light-emitting diode; 3. Gold finger; 4. Fingerprint recognition chip; 5. Filter; 6. Reinforcement plate; 7. Protrusion; 8. Shell; 9. Protrusion; 10. Lens; 11. Transparent cover; 12. Adhesive layer; 13. Positioning groove; 14. Positioning column. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0021] As described in the background technology, the traditional optical fingerprint module is mainly electrically connected to the external circuit through a plug-in connector. However, during long-term use, the plug-in connector is prone to poor connection, unstable contact, and even interface loss due to friction due to the increase in the number of plug-in and unplugging times, which affects the performance and service life of the fingerprint recognition module. In addition, the connection conductivity of the connector is poor and the volume is large. In addition, with the widespread application of optical fingerprint modules, the market has higher and higher requirements for the life, stability, and performance of the module, and traditional plug-in connectors have been difficult to meet the needs of modern applications.

[0022] In order to solve this technical problem, the present invention provides an optical fingerprint module with double-sided gold fingers, which is applied in the field of fingerprint modules.

[0023] Specifically, please refer to Figure 1-8 The optical fingerprint module with double-sided gold fingers specifically includes a flexible circuit board 1, on which a fingerprint sensor and at least one light-emitting diode 2 are mounted, and the flexible circuit board 1 is provided with a plug-in terminal 103, and gold fingers 3 are provided on both surfaces of the plug-in terminal 103, and a plurality of gold fingers 3 are arranged at intervals to form a row of gold fingers 3, and the plug-in terminal 103 is provided with a limiting structure.

[0024] The optical fingerprint module with double-sided gold fingers provided by the present invention realizes fingerprint recognition through the light-emitting diode 2 and the fingerprint sensor installed on the flexible circuit board 1. The gold fingers 3 are arranged on both surfaces of the plug-in end 103 on the flexible circuit board 1, which enhances the conductivity and wear resistance, can effectively reduce the loss caused by frequent plugging and unplugging, ensures long-term stable operation, extends the service life of the module, ensures that each connection can provide reliable electrical contact, improves the reliability and stability of the product, effectively saves space, reduces costs, has a flexible scope of use, and the limiting structure can ensure that the gold fingers 3 are placed in place to avoid alignment deviation, which can meet the needs of modern applications.

[0025] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0026] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0028] Embodiment 1 Please refer to Figure 1-8 , an optical fingerprint module with a double-sided gold finger is provided, which includes a flexible circuit board 1, the flexible circuit board 1 has a built-in circuit layer, the flexible circuit board 1 includes a flexible main body 101, a connecting section 102 and a plug-in end 103, the main body 101 is connected to the plug-in end 103 through the connecting section 102, the main body 101 and the connecting section 102 are both made of flexible materials, the plug-in end 103 is made of hard materials, such as the plug-in end 103 is made of a PCB board, the substrate is a glass fiber epoxy resin or a paper substrate, and the intersection corner of the plug-in end 103 and the connecting section 102 It is an arc-shaped structure. A fingerprint sensor and at least one light-emitting diode 2 are installed on the main body 101 of the flexible circuit board 1. In this example, there are three light-emitting diodes 2. Gold fingers 3 are arranged on both surfaces of the plug-in end 103. Multiple gold fingers 3 are arranged at intervals to form a row of gold fingers 3. The gold fingers 3 on the two surfaces of the plug-in end 103 are arranged one by one, so that the plug-in end 103 can be plugged with the connector of the external circuit on both sides, which improves the scope of use and makes the installation more flexible. The plug-in end 103 is provided with a limiting structure, which is arranged at the junction of the connecting section 102 and the plug-in end 103.

[0029] Furthermore, the fingerprint sensor includes a fingerprint recognition chip 4 mounted on the flexible circuit board 1. The fingerprint recognition chip 4 has a built-in sensor, which is an optical sensor for capturing reflected light and converting it into a digital image signal to identify the fingerprint signal. The surface of the fingerprint recognition chip 4 is covered with a filter 5. The filter 5 reduces the interference of ambient light, improves contrast and clarity, optimizes light distribution, and prevents excessive light from entering the sensor, thereby improving image quality and improving the recognition accuracy of the sensor.

[0030] The fingerprint sensor and the light-emitting diode are both installed on the front side of the main body 101. A reinforcing plate 6 is provided on the back side of the main body 101. The reinforcing plate 6 is a polyimide plate or a steel plate, and in this case, it is a polyimide plate. The light-emitting diode is arranged around the fingerprint sensor to illuminate the surface of the finger, so that the ridges and valleys of the fingerprint produce optical reflection differences, thereby facilitating imaging.

[0031] Embodiment 2 The optical fingerprint module of the double-sided gold finger provided in the first embodiment is further optimized, specifically, Figure 6 , Figure 7 As shown, the limiting structure is a protrusion 7 extending out from the side of the plug-in end 103. There are two protrusions 7 and they are respectively arranged on both sides of the plug-in end 103. The two protrusions 7 are on the same straight line facing the sides of the gold finger 3. The material of the protrusion 7 is consistent with the material of the substrate of the plug-in end 103. During preparation, the protrusion 7 and the substrate of the plug-in end 103 are prepared integrally. The setting of the protrusion 7 facilitates the plug-in connection between the plug-in end 103 and the connector on the external circuit. At the same time, the plug-in end 103 abuts against both sides of the port of the connector to limit the plug-in depth of the plug-in end 103 and ensure that the gold finger 3 is placed in place to avoid alignment deviation.

[0032] Embodiment 3 The optical fingerprint module of the double-sided gold finger provided in the second embodiment is further optimized, specifically, Figure 5 As shown, a shell 8 is provided on the front of the main body 101 of the flexible circuit board 1. The shell 8 is an injection molding structure. The shell 8 is fixedly connected to the reinforcing plate 6 by rivets passing through the main body 101, so that the shell 8 is fixed on the main body 101 of the flexible circuit board 1. The fingerprint sensor and the light-emitting diode 2 are both located in the shell 8. The shell 8 is located on the raised portion 9 above the fingerprint sensor. The raised portion 9 is an open cylindrical shell. A lens 10 is provided in the raised portion 9. The lens 10 is fixed to the inner wall of the raised portion 9 by clamping or bonding. The lens 10 is a spherical lens 10. The lens 10 focuses the light reflected from the finger surface onto the optical sensor. Since the texture structure on the finger surface is tiny, the focal length of the lens 10 needs to be very precise to ensure that the image sensor can capture clear fingerprint details.

[0033] A transparent cover 11 is also bonded and fixed to the top surface of the housing 8 by means of an adhesive layer 12. The transparent cover 11 covers the outer side of the protrusion 9. The adhesive layer 12 is a hot melt adhesive. The transparent cover 11 protects the lens 10 from dust pollution. The transparent cover 11 is provided with diagonally arranged positioning grooves 13, and the housing 8 is provided with positioning columns 14 matching the positioning grooves 13, so as to position the transparent cover 11.

[0034] The working principle of the optical fingerprint module with double-sided gold fingers provided by the present invention is as follows: fingerprint recognition is realized by means of the light-emitting diode 2 and the fingerprint sensor installed on the flexible circuit board 1, and gold fingers 3 are arranged on both surfaces of the plug-in end 103 on the flexible circuit board 1, which enhances the conductivity and wear resistance, can effectively reduce the loss caused by frequent plugging and unplugging, ensures long-term stable operation, extends the service life of the module, ensures that each connection can provide reliable electrical contact, improves the reliability and stability of the product, effectively saves space, reduces costs, has a flexible scope of use, and the limiting structure can ensure that the gold fingers 3 are placed in place to avoid misalignment, which can meet the needs of modern applications.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific embodiments, or to perform equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of the present invention, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present invention.

Claims

1. An optical fingerprint module with double-sided gold fingers, comprising a flexible circuit board, characterized in that: A fingerprint sensor and at least one light emitting diode are mounted on the flexible circuit board. The flexible circuit board is provided with a plug-in end. Both surfaces of the plug-in end are provided with gold fingers. A plurality of gold fingers are arranged at intervals to form a row of gold fingers, and the plug-in end is provided with a limiting structure.

2. The optical fingerprint module with double-sided gold finger according to claim 1, characterized in that: The fingerprint sensor comprises a fingerprint recognition chip mounted on a flexible circuit board, the fingerprint recognition chip has a built-in sensor, and a filter is arranged on the surface of the fingerprint recognition chip.

3. The optical fingerprint module with double-sided gold fingers according to claim 1, characterized in that: The flexible circuit board also includes a flexible main body and a connecting section. The main body is connected to the plug-in end through the connecting section, and the plug-in end is made of hard material.

4. The optical fingerprint module with double-sided gold fingers according to claim 3, characterized in that: The fingerprint sensor and the light emitting diode are both installed on the front side of the main body, and a reinforcing plate is provided on the back side of the main body.

5. The optical fingerprint module with double-sided gold fingers according to claim 1, characterized in that: The gold fingers on the two surfaces of the plug-in end are arranged in one-to-one correspondence.

6. The optical fingerprint module with double-sided gold fingers according to claim 1, characterized in that: The limiting structure is a protrusion extending out from the side of the plug-in end.

7. The optical fingerprint module with double-sided gold fingers according to claim 6, characterized in that: There are two protrusions, which are respectively arranged on two sides of the plug-in end, and the two sides of the protrusions facing the gold finger are on the same straight line.

8. An optical fingerprint module with double-sided gold fingers according to any one of claims 1 to 7, characterized in that: It also includes a shell, which is fixed on the flexible circuit board and the fingerprint sensor and the light-emitting diode are both located in the shell. The shell is located on the raised part above the fingerprint sensor, and the raised part is provided with a lens.

9. The optical fingerprint module with double-sided gold fingers according to claim 8, characterized in that: It also includes a transparent cover, which covers the outer side of the raised part and is bonded and fixed to the shell through an adhesive layer.

10. The optical fingerprint module with double-sided gold fingers according to claim 9, characterized in that: The transparent cover is provided with diagonally arranged positioning grooves, and the shell is provided with positioning columns matching the positioning grooves.

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