Indenter and fingerprint module testing device

Abstract

The present invention discloses a pressure head and fingerprint module testing device, the pressure head includes a fixed block and a circuit board, the circuit board includes a test part, and the circuit board includes a relative front and back, the test part of the front is provided with a pattern, and the test part of the back is connected to the fixed block. In the pressure head and fingerprint module testing device of the present invention, since the pattern is set on the circuit board, the pattern will not be compressed and deformed when the pressure head is pressed down, and the test result will not be affected, thereby ensuring the accuracy of the test. In addition, since the circuit board with the pattern and the fixed block are split structures, when the pattern is damaged, the circuit board can be replaced, and the fixed block can be reused, thereby reducing the maintenance cost.

Description

Technical Field

[0001] The present invention relates to the technical field of fingerprint recognition, and in particular to an indenter and a fingerprint module testing device. Background Art

[0002] At present, the technical application of fingerprint recognition is very extensive. Fingerprint recognition technology can be seen not only in access control and attendance systems, but also in the market. There are more applications of fingerprint recognition: such as laptops, mobile phones, cars, bank payments, etc. The performance of the fingerprint module needs to be tested before it leaves the factory. At present, a conductive black rubber block is generally used as the substrate, and a concave and convex zebra stripe pattern is set on the surface where the rubber block contacts the fingerprint module. The rubber block is used as a pressure head to press the fingerprint module to obtain the corresponding fingerprint test data and then evaluate the performance of the fingerprint module. However, the rubber block is relatively soft, and the concave and convex zebra stripes will have a certain amount of compression when pressed. This compression will affect the output signal result, resulting in inaccurate test results. Moreover, the fingerprint module will also produce common mode noise in its test data due to the conductive rubber block, affecting the accuracy of the test results. Summary of the invention

[0003] In view of this, the present invention provides an indenter and fingerprint module testing device with higher testing accuracy.

[0004] A pressure head comprises a fixed block and a circuit board, wherein the circuit board comprises a testing part and the circuit board comprises a front side and a back side opposite to each other, wherein the testing part on the front side is provided with a pattern, and the testing part on the back side is connected to the fixed block.

[0005] In an embodiment of the present invention, the testing section is grounded.

[0006] In an embodiment of the present invention, a conductive layer is provided on the front side of the circuit board. The circuit board also includes a connecting portion and a flexible portion. The flexible portion is connected between the testing portion and the connecting portion. The testing portion is electrically connected to the connecting portion through the conductive layer. The connecting portion is grounded.

[0007] In an embodiment of the present invention, a conductive layer is provided on the back side of the circuit board, a via hole is provided on the circuit board, a conductive layer is provided on the inner wall of the via hole to conduct the conductive layers on the front side and the back side, and the via hole is opened on the connecting portion.

[0008] In an embodiment of the present invention, a region of the back surface corresponding to the testing portion is not provided with a conductive layer.

[0009] In an embodiment of the present invention, the pressure head further comprises a base, the fixing block is mounted on the base, and the connecting portion is connected to the base.

[0010] In an embodiment of the present invention, a connecting hole is formed on the connecting portion, and the fixing member passes through the connecting hole to be connected to the base.

[0011] In an embodiment of the present invention, the fixing block includes a bottom end surface, the testing portion is connected to the bottom end surface of the fixing column, and the shape of the bottom end surface corresponds to the cross-sectional shape of the testing portion.

[0012] A fingerprint module testing device comprises the above-mentioned indenter and a testing platform facing the indenter.

[0013] In an embodiment of the present invention, a carrier facing the pressure head is provided on the test platform for placing the fingerprint module. A connecting seat is also provided on the test platform, and the connecting seat is electrically connected to the fingerprint module and the test platform respectively.

[0014] In the indenter and fingerprint module testing device of the present invention, since the pattern is set on the circuit board, the pattern will not be compressed and deformed when the indenter is pressed down, and the test result will not be affected, thereby ensuring the accuracy of the test. In addition, since the circuit board on which the pattern is set and the fixed block are separate structures, when the pattern is damaged or other problems occur, the circuit board can be replaced and the fixed block can be reused, thereby reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a structural schematic diagram of a fingerprint module testing device according to an embodiment of the present invention;

[0016] Figure 2 yes Figure 1 The front structural diagram of the circuit board of the fingerprint module testing device is shown;

[0017] Figure 3 yes Figure 1 The back structural diagram of the circuit board of the fingerprint module testing device shown;

[0018] Figure 4 yes Figure 1 The schematic diagram of the structure of the fixed block of the fingerprint module testing device is shown. DETAILED DESCRIPTION

[0019] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0020] like Figures 1 to 3As shown, in this embodiment, the fingerprint module testing device includes a pressure head 11 and a test platform 13, and the pressure head 11 includes a fixed block 111, a circuit board 113 and a substrate 15. The circuit board 113 includes a test part 115 and a connecting part 117, and the circuit board 113 includes a front side 1132 and a back side 1134 opposite to each other. The test part 115 on the front side 1132 is provided with a pattern, and the test part 115 on the back side 1134 is connected to the fixed block 111, the test part 115 is electrically connected to the connecting part 117, and the connecting part 117 is electrically connected to the grounding port of the test platform 13 to ground the test part 115. The fixed block 111 is mounted on the substrate 15, and the connecting part 117 is connected to the substrate 15.

[0021] In this embodiment, please refer to Figure 4 The fixed block 111 is a columnar body, which includes a bottom end face 1112, and the test part 115 is connected to the bottom end face 1112 of the fixed block 111. Specifically, the shape of the bottom end face 1112 corresponds to the cross-sectional shape of the test part 115. More specifically, the bottom end face 1112 may be in the shape of a runway, and correspondingly, the cross-section of the test part 115 is also in the shape of a runway. It can be understood that the shapes of the bottom end face 1112 and the test part 115 may also be other shapes such as circular, rectangular, elliptical, etc., which are not limited here. The fixed block 111 may be a rubber block. For ease of installation, the shape of the top end face 1114 of the fixed block 111 is the same as the shape of the bottom end face 1112, so that it can be installed at will without distinguishing between the top and the bottom.

[0022] In this embodiment, the circuit board 113 includes two connecting parts 117, the test part 115 is located between the two connecting parts 117, and the two connecting parts 117 are respectively connected to the two sides of the base 15. Specifically, a flexible part 119 is further provided between the test part 115 and the connecting part 117, so that the circuit board 113 can be bent, so that the connecting part 117 is bent to the side of the base 15 and connected thereto. A connecting hole 120 is provided on the connecting part 117, and a fastener 122 passes through the connecting hole 120 to connect to the base 15. The fastener 122 can be a screw. The circuit board 113 can be a flexible circuit board. The circuit board 113 can be made of a flexible material such as polyimide.

[0023] A conductive layer is provided on the front side 1132 of the circuit board 113, a conductive layer is provided on the back side 1134 of the circuit board 113, a conductive hole is provided on the circuit board 113, and a conductive layer is provided on the inner wall of the conductive hole to conduct the conductive layer on the front side 1132 and the back side. It can be understood that the conductive hole can be the above-mentioned connecting hole 120, or other holes can be opened separately. When the connecting part 117 is connected to the substrate 15, the back side 1134 of the circuit board 113 contacts the side of the substrate 15, and the front side 1132 is exposed. Specifically, the conductive layer is a copper foil, and the thickness of the copper foil can be 16-20 microns. In this embodiment, the area of ​​the back side 1134 corresponding to the test part 115 is not provided with a conductive layer. The circuit board 113 is electrically connected to the ground port of the test platform 13 through the grounding wire 124. Specifically, the grounding wire 124 can contact the front side 1132 of the circuit board 113 to achieve electrical connection between the grounding wire 124 and the circuit board 113. It can be understood that the substrate 15 is generally made of metal material and is generally connected to the ground for grounding. At this time, the circuit board 113 may not be electrically connected to the ground port of the test platform 13. Of course, the test unit 115 can be connected to any other ground terminal, and is not limited to the ground port of the test platform 13. There is no limitation here, as long as the test unit 115 is grounded.

[0024] In other embodiments, the circuit board 113 is provided with a conductive layer only on the front side 1132, and no conductive layer is provided on the back side 1134. In another embodiment, the front side 1132 of the circuit board 113 is provided with a conductive layer, and the entire back side 1134 is provided with a conductive layer, but in contrast, in the embodiment where the area of ​​the back side 1134 corresponding to the test section 115 is not provided with a conductive layer, charge coupling between the conductive layers of the front side 1132 and the back side 1134 is avoided, thereby improving the test accuracy.

[0025] The pattern on the test part 115 of the circuit board 113 may be a zebra stripe pattern. Specifically, the stripes of the zebra stripe pattern are inclined at 45° relative to the edge of the test part 115. It can be understood that the inclination angle of the stripes of the zebra stripe pattern relative to the edge of the test part 115 may also be 30°, 60° or other angles. In this embodiment, it has been experimentally proved that the stripes of the test part 115 of the fingerprint module test device adopt an inclination angle of 45° to obtain a good test effect. The area S>L of the zebra stripe pattern 2 *A*B, where L is the side length of a single pixel of the fingerprint module, and the pixel row and column matrix is ​​A*B; the sum of the line width and line distance of the zebra stripe pattern is 8 times the side length of a single pixel, and the line width: line distance = 7:13, where the line width is the width of each zebra stripe, and the line distance is the distance between two adjacent zebra stripes.

[0026] In this embodiment, a mounting groove 151 is provided at the bottom of the base 15, and the end of the fixing block 111 not connected to the testing part 115 is installed in the mounting groove 151. A pressing shaft 152 is provided at the top of the base 15 opposite to the bottom, and the entire pressing head 11 can be pressed down by applying a downward force to the pressing shaft 152.

[0027] In this embodiment, the test platform 13 is provided with a carrier 132 facing the pressure head 11 for placing the fingerprint module 100. The test platform 13 is also provided with a connection seat 134, which is electrically connected to the fingerprint module 100 and the test platform 13 respectively, so as to transmit the signal sensed by the fingerprint module 100 to the test platform 13 to obtain test data.

[0028] When testing the fingerprint module 100, the fingerprint module 100 is placed on the carrier 132 of the test platform 13, so that the fingerprint module 100 is electrically connected to the test platform 13, and then the pressure head 11 is pressed down, and the test part 115 presses the fingerprint module 100. The fingerprint module 100 obtains fingerprint test data, and the test platform 13 evaluates the performance of the fingerprint module 100 based on the data, thereby realizing the test of the fingerprint module 100.

[0029] By using the fingerprint module test device, since the pattern is set on the circuit board 113, the pattern will not be compressed and deformed when the pressure head 11 is pressed down, and the test result will not be affected, thereby ensuring the accuracy of the test. In addition, since the circuit board 113 on which the pattern is set and the fixed block 111 are separate structures, when the pattern is damaged or other problems occur, the circuit board 113 can be replaced, and the fixed block 111 can be reused, thereby reducing maintenance costs. In addition, since the test unit 115 is grounded, common mode noise can be removed, further improving the accuracy of the test.

[0030] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention. The various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

Claims

1. A pressure head, characterized in that: The invention comprises a fixing block (111) and a circuit board (113), wherein the circuit board (113) comprises a test portion (115), and the circuit board (113) comprises a front side (1132) and a back side (1134) opposite to each other, wherein the test portion (115) on the front side (1132) is provided with a pattern, and the test portion (115) on the back side (1134) is connected to the fixing block (111), wherein the fixing block (111) is a rubber block, and the circuit board (113) is made of polyimide, and a conductive layer is provided on the front side (1132) of the circuit board (113), and the circuit board (113) further comprises a connection The test part (115) and the connecting part (117) are connected to each other, the flexible part (119) being connected between the test part (115) and the connecting part (117); the test part (115) is electrically connected to the connecting part (117) through the conductive layer; the connecting part (117) is grounded; the pressure head (11) further comprises a base body (15); the fixing block (111) is mounted on the base body (15); the connecting part (117) is connected to the base body (15); a connecting hole (120) is formed on the connecting part (117); and a fastener (122) passes through the connecting hole (120) to be connected to the base body (15).

2. The pressure head according to claim 1, characterized in that The back side (1134) of the circuit board (113) is provided with a conductive layer, the circuit board (113) is provided with a conducting hole, the inner wall of the conducting hole is provided with a conductive layer to conduct the conductive layer on the front side (1132) and the back side (1134), and the conducting hole is opened on the connecting portion (117).

3. The pressure head according to claim 2, characterized in that The area of ​​the back side (1134) corresponding to the test portion (115) is not provided with a conductive layer.

4. The pressure head according to claim 1, characterized in that The fixing block (111) comprises a bottom end surface (1112), the testing portion (115) is connected to the bottom end surface (1112) of the fixing block (111), and the shape of the bottom end surface (1112) corresponds to the cross-sectional shape of the testing portion (115).

5. A fingerprint module testing device, characterized in that: It comprises the pressure head (11) according to any one of claims 1 to 4 and a test platform (13) facing the pressure head (11).

6. The fingerprint module testing device according to claim 5, characterized in that: The test platform (13) is provided with a carrier (132) facing the pressure head (11) and used to place the fingerprint module (100). The test platform (13) is also provided with a connecting seat (134), and the connecting seat (134) is electrically connected to the fingerprint module (100) and the test platform (13), respectively.

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