Fingerprint head structure

Abstract

The application relates to the technical field of optical acquisition devices, and particularly discloses a fingerprint head structure, which comprises a prism, a fingerprint head shell, a reflector, a lens assembly and a mainboard; the prism is arranged in a prism groove of the fingerprint head shell; the reflector is arranged in a reflector mounting groove of the fingerprint head shell; the lens assembly comprises a reflector support, a lens support and a lens; the lens and the reflector support are both mounted on the lens support; the lens assembly is arranged in the fingerprint head shell, and the reflector support abuts against the reflector; and the mainboard is arranged in the fingerprint head shell. In the scheme, the lens and the reflector support are integrally mounted on the lens support to form an integrated lens assembly, so that the three can be preassembled and accurately positioned; meanwhile, the focusing operation on the lens can be directly performed on the lens assembly without the need of operation in the fingerprint head shell; then, the positioning of the lens assembly is completed to position the installation position of the lens, and the working efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of optical acquisition device technology, and in particular to a fingerprint sensor structure. Background Technology

[0002] A fingerprint sensor is an optical biometric acquisition component. Its structure consists of a fingerprint sensor housing, a lens, a lens holder, a reflector, and a prism. The prism is used to allow the user's finger to touch the sensor to form a fingerprint imaging area. The reflector is used to change the optical path so that the image is transmitted to the lens. The lens holder is used to support the lens and ensure its optical position is stable. The precision of the structural fit of each component directly determines the clarity of the fingerprint acquisition and the reliability of the device.

[0003] In the current fingerprint sensor manufacturing process, the reflector, lens bracket, and lens are sequentially installed into the fingerprint sensor housing. After assembly, workers need to manually focus the lens to align the light paths of the lens with those of the reflector and prism. This method is inefficient and results in high time costs for the entire assembly process. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a fingerprint head structure to solve the problem of low assembly efficiency caused by long focusing time after assembly of existing fingerprint heads.

[0005] To achieve the above technical objectives, this application provides a fingerprint sensor structure, including: a prism, a fingerprint sensor housing, a reflector, a lens assembly, and a motherboard;

[0006] The prism is disposed within the prism groove of the fingerprint sensor housing;

[0007] The reflector is disposed in the reflector mounting slot of the fingerprint sensor housing;

[0008] The lens assembly includes: a mirror bracket, a lens bracket, and a lens;

[0009] Both the lens and the mirror bracket are mounted on the lens bracket;

[0010] The lens assembly is disposed inside the fingerprint sensor housing, and the reflector bracket abuts against the reflector;

[0011] The motherboard is mounted on the fingerprint sensor housing.

[0012] Furthermore, the lens assembly is provided with an extension rod;

[0013] The fingerprint sensor housing has a positioning groove inside;

[0014] The extension rod extends into the positioning groove.

[0015] Furthermore, a guide edge is provided inside the fingerprint sensor housing;

[0016] The guide edge smoothly transitions to the side of the positioning groove, allowing the extension rod to be inserted into the positioning groove along the guide edge.

[0017] Furthermore, the prism abuts against the extension rod.

[0018] Furthermore, the lens bracket is provided with a locking post;

[0019] The reflector bracket is provided with a locking hole;

[0020] The locking pin is fitted into the locking hole.

[0021] Furthermore, the lens bracket is provided with a lens mounting slot;

[0022] The lens is mounted in the lens mounting slot.

[0023] Furthermore, the lens is bonded to the lens bracket;

[0024] The mirror bracket is bonded to the lens bracket.

[0025] Furthermore, a support plate is provided on the reflector bracket;

[0026] The fingerprint sensor housing is provided with a limiting groove;

[0027] The limiting groove is connected to the reflector mounting groove;

[0028] The support plate extends into the limiting groove, and the end of the support plate abuts against the groove wall and the reflector.

[0029] Furthermore, an image acquisition device is provided on the motherboard;

[0030] The lens is equipped with a convex lens;

[0031] The image acquisition device is aligned with the lens so that the lens transmits the fingerprint image to the image acquisition device.

[0032] Furthermore, the fingerprint sensor housing is provided with an inlet;

[0033] The reflector and the lens assembly are inserted into the fingerprint sensor housing through the loading port;

[0034] The motherboard closes the loading port.

[0035] As can be seen from the above technical solutions, this application provides a fingerprint sensor structure, including: a prism, a fingerprint sensor housing, a reflector, a lens assembly, and a motherboard; the prism is disposed in a prism groove of the fingerprint sensor housing; the reflector is disposed in a reflector mounting groove of the fingerprint sensor housing; the lens assembly includes: a reflector bracket, a lens bracket, and a lens; both the lens and the reflector bracket are mounted on the lens bracket; the lens assembly is disposed within the fingerprint sensor housing, and the reflector bracket abuts against the reflector; the motherboard is disposed within the fingerprint sensor housing.

[0036] In this solution, the lens and mirror bracket are integrated into a single lens assembly, allowing for pre-installation and precise positioning of all three components. Furthermore, focusing can be performed directly on the lens assembly without needing to operate within the fingerprint sensor housing. The lens's installation position is then determined by positioning the lens assembly. Compared to focusing within the fingerprint sensor housing, this solution eliminates the limitations of the confined space inside, significantly improving operational efficiency. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of a fingerprint sensor structure provided in an embodiment of this application;

[0039] Figure 2 This is a schematic diagram of the internal structure of a fingerprint sensor housing provided in an embodiment of this application;

[0040] Figure 3 A split view of a fingerprint sensor structure provided in an embodiment of this application;

[0041] In the diagram: 1. Prism; 2. Fingerprint sensor housing; 21. Reflector mounting slot; 22. Positioning slot; 23. Prism slot; 24. Limiting slot; 25. Guide edge; 26. Clearance slot; 27. Mounting entrance; 3. Reflector; 4. Reflector support frame; 41. Top plate; 42. Snap-in hole; 5. Lens bracket; 51. Extension rod; 52. Protruding post; 53. Lens mounting slot; 6. Lens; 7. Fingerprint sensor mainboard; 71. Image acquisition unit; 72. Fill light. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments in this application specification, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection claimed in this application.

[0043] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a replaceable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0045] Please see Figure 1 and Figure 3 The fingerprint sensor structure provided in this application includes: a prism 1, a fingerprint sensor housing 2, a reflector 3, a lens assembly, and a motherboard 7; the prism 1 is disposed in the prism groove 23 of the fingerprint sensor housing 2; the reflector 3 is disposed in the reflector mounting groove 21 of the fingerprint sensor housing 2; the lens assembly includes: a reflector bracket 4, a lens bracket 5, and a lens 6; the lens 6 and the reflector bracket 4 are both mounted on the lens bracket 5; the lens assembly is disposed in the fingerprint sensor housing 2, and the reflector bracket 4 abuts against the reflector 3; the motherboard 7 is disposed in the fingerprint sensor housing 2.

[0046] In this embodiment, the reflector bracket 4, lens bracket 5, and lens 6 are assembled into a lens assembly outside the fingerprint sensor housing 2, enabling pre-installation of the lens 6. Since the lens bracket 5 serves as a support for the lens 6, after installation, the lens 6 needs to be focused and verified to ensure it is installed in the correct position on the lens bracket 5 and can effectively transmit the light reflected by the reflector 3 to the image acquisition unit 71 on the motherboard 7.

[0047] Compared to existing technologies that focus within the fingerprint sensor housing 2, this solution allows focusing to be performed on the lens assembly, i.e., outside the fingerprint sensor housing 2. This eliminates the limitations of the confined space inside the housing, improving operational efficiency. Furthermore, in existing assembly methods, the housing assembly process (inserting components into the fingerprint sensor housing 2) and the focusing operation must be performed concurrently, requiring the housing assembly equipment and focusing equipment to be interleaved on the production line. In this solution, however, the focusing and verification equipment can be separately configured from the housing assembly equipment on different production lines, allowing for continuous assembly operations. This reduces the need for repositioning the fingerprint sensor housing 2 during assembly, further improving assembly efficiency.

[0048] It should be noted that focusing and verification of lens 6 are performed using specialized equipment. For example, a common focusing method is to use a small screwdriver to adjust the focusing screw on lens 6. The shaking of lens 6 during the installation of lens bracket 5 has little impact on its focal length, therefore, no further focusing is required after it is installed in the housing.

[0049] Furthermore, in this design, after the lens assembly is installed, the mirror bracket 4 abuts against the mirror 3, ensuring that the lens 6 and the mirror 3 maintain a preset distance. Simultaneously, the mirror bracket 4 presses against the mirror 3, thus fixing the mirror 3 in place and structurally ensuring the stability of the optical relative position between the lens 6 and the mirror 3. Additionally, in some production lines requiring manual assembly, the mirror bracket 4 abutting against the mirror 3 provides feedback to workers indicating that the installation is in place, helping them assess the lens assembly's installation status.

[0050] In a more specific embodiment, an image acquisition unit 71 is provided on the motherboard 7; a convex lens is provided inside the lens 6; the image acquisition unit 71 is aligned with the lens 6 so that the lens 6 transmits the fingerprint image to the image acquisition unit 71.

[0051] Specifically, during the focusing operation, the convex lens in lens 6 is adjusted to a preset focal length, so that after the motherboard 7 is installed, the focal length of the convex lens in lens 6 is aligned with the image acquisition unit 71.

[0052] In one embodiment, the fingerprint sensor housing 2 is provided with an inlet 27; the reflector 3 and the lens assembly are inserted into the fingerprint sensor housing 2 through the inlet 27; the motherboard 7 closes the inlet 27.

[0053] In this embodiment, the motherboard 7 can be assembled with the fingerprint sensor housing 2 using screws or other connectors. After the motherboard 7 is installed, it abuts against the lens assembly to press and fix the lens assembly inside the fingerprint sensor housing 2.

[0054] In one embodiment, the image acquisition unit 71 is disposed on the inner side of the motherboard 7. Furthermore, the inner side of the motherboard 7 may be provided with a supplementary light to illuminate the interior of the fingerprint sensor housing 2. A PFC cable may be disposed on the outer side of the motherboard 7, and the PFC cable is communicatively connected to the image acquisition unit 71.

[0055] In one embodiment, an extension rod 51 is provided on the lens assembly; a positioning groove 22 is provided inside the fingerprint sensor housing 2; and the extension rod 51 extends into the positioning groove 22.

[0056] The extension rod 51 can be mounted on the lens bracket 5. The cooperation between the extension rod 51 and the positioning groove 22 can play a positioning role for the lens assembly.

[0057] In one embodiment, a guide edge 25 is provided inside the fingerprint sensor housing 2; the guide edge 25 smoothly transitions to the side of the positioning groove 22, so that the extension rod 51 can be inserted into the positioning groove 22 along the guide edge 25.

[0058] The guide edge 25 facilitates the installation of the extension rod 51 into the positioning slot 22 by the staff during assembly, thereby improving assembly efficiency.

[0059] In one embodiment, the length of the reflector mounting groove 21 along the width direction of the fingerprint sensor housing 2 is configured to be greater than the length of the reflector 3 along the width direction of the fingerprint sensor housing 2.

[0060] In this embodiment, the reflector mounting slot 21 provides a clearance for the reflector 3, improving the installation efficiency of the reflector while accommodating manufacturing errors between the fingerprint sensor housing 2 and the reflector 3. Furthermore, in this embodiment, the direction in which the reflector 3 can offset relative to the reflector mounting slot 21 after installation is a first direction. This movement does not affect the reflection effect of the reflector 3 on the light path of the prism 1, thus improving assembly efficiency and mitigating the effects of thermal stress while ensuring imaging quality.

[0061] As one implementation, a clearance groove 26 may be provided on the side of the reflector mounting groove 21 along the length direction of the fingerprint head housing 2, so that the reflector 3 can be installed into the reflector mounting groove 21.

[0062] In one embodiment, after the prism 1 is inserted into the prism slot 23, the prism 1 abuts against the extension rod 51, so that the extension rod 51 provides limiting and support for the prism 1. In this way, the optical relative positions of the prism 1, the reflector 3, and the lens 6 can be stabilized structurally.

[0063] In one embodiment, the lens bracket 5 is provided with a locking post 52; the mirror bracket 4 is provided with a locking hole 42; and the locking post 52 is sleeved in the locking hole 42.

[0064] In this embodiment, the mirror bracket 4 and the lens bracket 5 can be connected to each other by adhesive bonding. The positioning of the locking holes 42 and the locking posts 52 ensures the accuracy of their relative installation positions.

[0065] In one embodiment, the lens bracket 5 is provided with a lens mounting slot 53; the lens 6 is mounted in the lens mounting slot 53.

[0066] Correspondingly, the lens 6 and the lens bracket 5 can be connected to each other by adhesive bonding. The lens mounting slot 53 can limit and position the lens 6, so that the lens 6 can be accurately installed in the lens bracket 5.

[0067] In one embodiment, a support plate 41 is provided on the reflector bracket 4; a limiting groove 24 is provided inside the fingerprint head housing 2; the limiting groove 24 is connected to the reflector mounting groove 21; the support plate 41 extends into the limiting groove 24, and the end of the support plate 41 abuts against the groove wall of the limiting groove 24 and against the reflector 3.

[0068] In this embodiment, the reflector bracket 4 can be provided with support plates 41 on both sides along the width direction of the fingerprint head housing 2. Correspondingly, two limiting grooves 24 are provided inside the fingerprint head housing 2. The height difference between the limiting groove 24 and the reflector mounting groove 21 can be the thickness of the reflector 3. The limiting groove 24 can limit the top plate 41, so that the operator can judge whether the top plate 41 is installed in place, and at the same time improve the stability of the lens assembly after installation.

[0069] The above are merely preferred embodiments of this application and are not intended to limit the present invention. Although the present application has been described in detail with reference to examples, those skilled in the art can still modify the technical solutions described in the foregoing examples or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A fingerprint sensor structure, characterized in that, include: Prism (1), fingerprint sensor housing (2), reflector (3), lens assembly and motherboard (7); The prism (1) is disposed in the prism groove (23) of the fingerprint head housing (2); The reflector (3) is disposed in the reflector mounting groove (21) of the fingerprint head housing (2); The lens assembly includes: a mirror bracket (4), a lens bracket (5), and a lens (6); The lens (6) and the mirror bracket (4) are both mounted on the lens bracket (5). The lens assembly is disposed inside the fingerprint head housing (2), and the reflector bracket (4) abuts against the reflector (3). The motherboard (7) is disposed on the fingerprint sensor housing (2).

2. The fingerprint sensor structure according to claim 1, characterized in that, An extension rod (51) is provided on the lens assembly. The fingerprint sensor housing (2) has a positioning groove (22) inside. The extension rod (51) extends into the positioning groove (22).

3. The fingerprint sensor structure according to claim 2, characterized in that, The fingerprint sensor housing (2) is provided with a guide edge (25); The guide edge (25) smoothly transitions to the side of the positioning groove (22), so that the extension rod (51) can be inserted into the positioning groove (22) along the guide edge (25).

4. The fingerprint sensor structure according to claim 2 or 3, characterized in that, The prism (1) abuts against the extension rod (51).

5. The fingerprint sensor structure according to claim 1, characterized in that, The lens bracket (5) is provided with a locking post (52); The reflector bracket (4) is provided with a locking hole (42); The locking pin (52) is fitted into the locking hole (42).

6. The fingerprint sensor structure according to claim 1, characterized in that, The lens bracket (5) is provided with a lens mounting slot (53); The lens (6) is installed in the lens mounting slot (53).

7. The fingerprint sensor structure according to claim 1, characterized in that, The lens (6) is bonded to the lens bracket (5); The mirror bracket (4) is bonded to the lens bracket (5).

8. The fingerprint sensor structure according to claim 1, characterized in that, A support plate (41) is provided on the reflector bracket (4). A limiting groove (24) is provided inside the fingerprint head housing (2); The limiting groove (24) is connected to the reflector mounting groove (21); The support plate (41) extends into the limiting groove (24), and the end of the support plate (41) abuts against the groove wall of the limiting groove (24) and against the reflector (3).

9. The fingerprint sensor structure according to claim 1, characterized in that, An image acquisition device (71) is provided on the motherboard (7); A convex lens is provided inside the lens (6); The image acquisition unit (71) is aligned with the lens (6) so that the lens (6) transmits the fingerprint image to the image acquisition unit (71).

10. The fingerprint sensor structure according to claim 1, characterized in that, The fingerprint sensor housing (2) is provided with an inlet (27); The reflector (3) and the lens assembly are inserted into the fingerprint sensor housing (2) through the loading port (27); The motherboard (7) closes the loading port (27).

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