Fingerprint module embedded with liquid lens

Abstract

The utility model discloses a kind of fingerprint module of embedding liquid lens, including lens base;Protective ring, threaded assembly in the top of the lens base for the embedding assembly of optical lens;Liquid lens, it is located in the inside of the lens base and with the optical lens above and below corresponding;Fingerprint FPC is bound with the liquid lens by binding area and is bound to connect;Fingerprint sensor, it is located in the bottom of the liquid lens, and one end of the fingerprint FPC is penetrated through the lens base at outside and is connected to connect with the fingerprint sensor.The utility model provides a kind of fingerprint module of embedding liquid lens, the liquid lens is added in the inside of conventional fingerprint module, so it can be realized quick focusing by changing the droplet curvature of liquid lens, improve the precision and adaptability of fingerprint identification, especially in the complex environment of temperature higher optical lens easy change still can maintain the high performance of optical fingerprint module, applicability is better.

Description

Technical Field

[0001] This utility model relates to the field of liquid lens technology, and in particular to a fingerprint module embedded with a liquid lens. Background Technology

[0002] A liquid lens is an optical device that adjusts the focal length by utilizing the properties of a liquid. It works by using a variable focal length lens composed of a pair of water droplets that vibrate under high-frequency sound waves. Mimicking the design of the human eye's lens, it achieves rapid focusing by precisely controlling the shape of the liquid sphere through a motor.

[0003] Traditional optical fingerprint modules typically use fixed-focal-length lenses to capture fingerprint images, which imposes strict requirements on focal length control. Furthermore, fixed-focal-length optical fingerprint modules limit their ability to adapt to different fingerprint depths and other conditions. To address this, a fingerprint module with an embedded liquid lens is proposed. Utility Model Content

[0004] Therefore, it is necessary to provide a fingerprint module with an embedded liquid lens to address the above-mentioned technical problems. By adding a liquid lens inside a conventional fingerprint module, the curvature of the liquid droplet in the liquid lens can be changed to achieve fast focusing, thereby improving the accuracy and adaptability of fingerprint recognition. In particular, it can maintain the high performance of the optical fingerprint module even in complex environments where optical lenses are prone to changes, such as high temperatures.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A fingerprint module with an embedded liquid lens, comprising:

[0007] Lens mount;

[0008] A protective ring, threadedly fitted to the top of the lens base, is used for the embedded mounting of the optical lens;

[0009] A liquid lens is disposed inside the lens base and corresponds vertically to the optical lens above it;

[0010] The fingerprint FPC is connected to the liquid lens via a binding area;

[0011] A fingerprint sensor is located at the bottom of the liquid lens, and one end of the fingerprint FPC passes through the lens base to the outside and is connected to the fingerprint sensor.

[0012] Furthermore, the inner side of the lens base has an internal threaded groove, and the bottom of the protective ring has an external threaded groove. Rotating the protective ring allows the external threaded groove to be screwed into the internal threaded groove to complete the assembly with the lens base.

[0013] Furthermore, the surface of the protective ring is provided with a protective element, which can protect the connection between the external thread groove and the internal thread groove under the action of the protective element.

[0014] Furthermore, the protective element includes a closed ring fixed to the outside of the protective ring, and the inner side of the assembled closed ring is in close contact with the surface of the lens base.

[0015] Furthermore, the inner side of the closed ring has a mounting cavity, and an elastic sealing rubber ring is fixed to the side wall of the mounting cavity.

[0016] Furthermore, the elastic sealing rubber ring protrudes outside the mounting cavity in its natural state, so that the elastic sealing rubber ring is pressurized to form an interference fit.

[0017] Furthermore, the surface of the lens base is provided with an outlet groove, through which the fingerprint FPC bound to the liquid lens is led out to the outside of the lens base.

[0018] Furthermore, the fingerprint FPC extending outside the lens base is bent at the bottom of the lens base for mounting the fingerprint sensor.

[0019] Furthermore, the inner side of the lens base has a mounting boss, and the liquid lens is fixed to the mounting boss by optical adhesive, so that there is a gap height between the top and bottom of the liquid lens and the corresponding optical lens and fingerprint sensor.

[0020] Furthermore, a steel reinforcing plate is fixed to the other side of the fingerprint FPC relative to the fingerprint sensor, and the other end of the fingerprint FPC is connected to the external main control board.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The fingerprint module with embedded liquid lens provided by this utility model adds a liquid lens inside the conventional fingerprint module. This allows for fast focusing by changing the curvature of the liquid droplet in the liquid lens, improving the accuracy and adaptability of fingerprint recognition. In particular, it can maintain the high performance of the optical fingerprint module even in complex environments where the optical lens is prone to change, such as high temperature, and has better applicability.

[0023] Meanwhile, the threaded structure between the lens base and the protective ring facilitates their disassembly and assembly, as well as the assembly of the internal liquid lens and optical lens, and also facilitates subsequent disassembly and maintenance.

[0024] By setting up protective elements, after the lens base and protective ring are threaded together, the sealing ring covers the threaded connection, which can block the threaded contact gap, thereby improving the sealing effect at the connection and further protecting the liquid lens inside.

[0025] Furthermore, after the elastic sealing rubber ring is assembled, it can form a contact with the outer wall of the lens base. This design of the elastic sealing rubber ring can not only improve the sealing and protection effect of the inner side of the sealing ring, but also limit the position of the protective ring after rotation and adjustment through the contact friction between the elastic sealing rubber ring and the lens base, thus preventing it from rotating and shifting on its own and causing the relative displacement between the optical lens and the liquid lens. Attached Figure Description

[0026] Figure 1 A schematic diagram of the structure of the fingerprint module with an embedded liquid lens provided by this utility model;

[0027] Figure 2 A partial structural schematic diagram of the fingerprint module with an embedded liquid lens provided by this utility model;

[0028] Figure 3 A schematic diagram of the protective element structure of the fingerprint module embedded with a liquid lens provided by this utility model;

[0029] Figure 4 A schematic diagram of the closed-loop structure of the fingerprint module with an embedded liquid lens provided by this utility model;

[0030] Figure 5 A schematic diagram of the elastic sealing rubber ring structure of the fingerprint module embedded with a liquid lens provided by this utility model;

[0031] Figure 6 A three-dimensional structural diagram of the protective element of the fingerprint module with embedded liquid lens provided by this utility model.

[0032] The markings in the diagram are explained as follows:

[0033] Lens base 1, internal thread groove 11, lead-out groove 12, mounting boss 13;

[0034] 2. Protective ring; 21. Optical lens; 22. External thread groove;

[0035] Liquid lens 3, binding area 31;

[0036] Fingerprint FPC 4;

[0037] Fingerprint sensor 5;

[0038] Protective element 6, sealing ring 61, mounting cavity 62, elastic sealing rubber ring 63. Detailed Implementation

[0039] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0040] As described in the background section, traditional optical fingerprint modules typically use fixed-focal-length lenses to capture fingerprint images. This places particularly strict demands on focal length control. Furthermore, fixed-focal-length optical fingerprint modules limit their ability to adapt to different fingerprint depths and other conditions to some extent.

[0041] To solve this technical problem, this utility model provides a fingerprint module embedded in a liquid lens, which is applied to a liquid lens.

[0042] For details, please refer to Figures 1-6 As shown, the fingerprint module embedded with the liquid lens specifically includes:

[0043] Lens mount 1;

[0044] The protective ring 2 is threaded onto the top of the lens base 1 for the embedded assembly of the optical lens 21.

[0045] The liquid lens 3 is disposed inside the lens base 1 and corresponds vertically to the optical lens 21 above it;

[0046] The fingerprint FPC4 is connected to the liquid lens 3 via the binding area 31;

[0047] The fingerprint sensor 5 is located at the bottom of the liquid lens 3, and one end of the fingerprint FPC 4 passes through the lens base 1 to the outside and is connected to the fingerprint sensor 5.

[0048] The fingerprint module with embedded liquid lens provided by this utility model adds a liquid lens 3 inside the conventional fingerprint module. This allows for rapid focusing by changing the curvature of the liquid droplet of the liquid lens 3, thereby improving the accuracy and adaptability of fingerprint recognition. In particular, it can maintain the high performance of the optical fingerprint module even in complex environments where the optical lens is prone to change, such as high temperature, and has better applicability.

[0049] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0050] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0051] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0052] Example 1

[0053] Please refer to Figures 1-6 As shown, a fingerprint module with an embedded liquid lens includes:

[0054] Lens mount 1;

[0055] The protective ring 2 is threaded onto the top of the lens base 1 for the embedded assembly of the optical lens 21.

[0056] The liquid lens 3 is disposed inside the lens base 1 and corresponds vertically to the optical lens 21 above it;

[0057] The fingerprint FPC4 is connected to the liquid lens 3 via the binding area 31;

[0058] The fingerprint sensor 5 is located at the bottom of the liquid lens 3, and one end of the fingerprint FPC 4 passes through the lens base 1 to the outside and is connected to the fingerprint sensor 5.

[0059] like Figure 1 As shown, the surface of the lens base 1 is provided with an outlet groove 12. The fingerprint FPC4, which is bound to the liquid lens 3, is led out of the outside of the lens base 1 through the outlet groove 12. Specifically, the fingerprint FPC4 is connected to the PAD area on the liquid lens 3 through a gold wire.

[0060] The fingerprint FPC4 extending from the outside of the lens base 1 is bent at the bottom of the lens base 1 for mounting the fingerprint sensor 5;

[0061] The inner side of the lens base 1 has a mounting protrusion 13. The liquid lens 3 is fixed to the mounting protrusion 13 by optical adhesive, so that the top and bottom of the liquid lens 3 are separated from the corresponding optical lens 21 and fingerprint sensor 5 by a gap. In this embodiment, in addition to the optical lens 21 in the conventional optical fingerprint module, a liquid lens 3 is added. After the module is assembled, the curvature of the liquid droplet of the liquid lens can be changed to achieve fast focusing, improve the accuracy and adaptability of fingerprint recognition, and there is no need to use a special fixture to press the lens to avoid scratching or damaging the lens. There is also no need to test whether the clarity of the optical fingerprint module meets the standard. The clarity can be adjusted by controlling the liquid lens.

[0062] The aforementioned liquid lens 3 is composed of two immiscible liquids (such as a conductive aqueous solution and an insulating oil), encapsulated within a transparent cavity. A smooth meniscus interface is formed at the junction of the two liquids; this interface is the optical refractive surface, i.e., the focal plane of the lens. The curvature control principle is based on the electrowetting effect of the conductive liquid when a controllable voltage is applied to the sidewall of the cavity: the voltage changes the contact angle between the liquid and the cavity wall, thereby changing the radius of curvature of the meniscus interface. Therefore, controlling the shape of the liquid interface via electrical signals takes only milliseconds, far faster than the focusing motion of traditional mechanical lenses. Furthermore, since the specific structural principle of the liquid lens 3 is already well-known to those skilled in the art, further elaboration is unnecessary in this embodiment.

[0063] The fingerprint sensor 5, liquid lens 3, and optical lens 21 are arranged vertically in a corresponding manner.

[0064] Furthermore, a steel reinforcing plate is fixed on the other side of the fingerprint FPC4 relative to the fingerprint sensor 5, and the other end of the fingerprint FPC4 is connected to the external main control board. When the fingerprint FPC4 is connected to the external main control board, the performance of the fingerprint sensor 5 and the liquid lens 3 can be controlled.

[0065] Furthermore, by setting up reinforcing steel sheets, local strength support can be provided for the area where the fingerprint sensor 5 is installed. This can effectively ensure the flatness of the area and prevent bending, which would affect the sensing application of the fingerprint sensor 5.

[0066] Example 2

[0067] The fingerprint module with an embedded liquid lens provided in Embodiment 1 is further optimized, specifically, as follows: Figure 4 As shown, the inner side of the lens base 1 has an internal thread groove 11, and the bottom of the protective ring 2 has an external thread groove 22. Rotating the protective ring 2 allows the external thread groove 22 to be screwed into the internal thread groove 11 to complete the assembly with the lens base 1.

[0068] The design of the internal thread groove 11 and the external thread groove 22 allows the lens base 1 and the protective ring 2 to be separated independently, while also allowing for mutual assembly. This facilitates the independent installation of the internal optical lens 21 and the liquid lens 3, and makes subsequent disassembly and maintenance easier.

[0069] Example 3

[0070] The fingerprint module with embedded liquid lens provided in Embodiment 1 or 2 is further optimized, such as... Figure 4 , Figure 5 and Figure 6 As shown, the surface of the protective ring 2 is provided with a protective element 6, which can protect the connection between the external thread groove 22 and the internal thread groove 11 under the action of the protective element 6;

[0071] like Figure 4 As shown, the protective element 6 includes a closed ring 61 fixed to the outside of the protective ring 2, and the inner side of the closed ring 61 after assembly is in close contact with the surface of the lens base 1;

[0072] When the protective ring 2 is fully threaded into place with the lens base 1, the sealing ring 61 will cover the connection between the inner thread groove 11 and the outer thread groove 22, thus effectively sealing the connection and improving the protection effect of the liquid lens 3 inside the lens base 1.

[0073] Furthermore, such as Figure 4 and Figure 5 As shown, the inner side of the closed ring 61 has a mounting cavity 62, and an elastic sealing rubber ring 63 is fixed on the side wall of the mounting cavity 62.

[0074] The elastic sealing rubber ring 63 protrudes outside the mounting cavity 62 in its natural state, so that the elastic sealing rubber ring 63 is compressed and thus fits in an interference fit.

[0075] When the sealing ring 61 rotates into position with the protective ring 2, the elastic sealing rubber ring 63 can form a contact effect with the outer wall of the lens base 1. The elastic sealing rubber ring 63 will deform under the contact effect, thus forming an interference fit. At this time, the elastic sealing rubber ring 63 ensures the stability of the protective ring 2 through the friction between it and the outer wall of the lens base 1, making it less prone to independent rotation and displacement. At the same time, it can further form a better sealing effect, which is more conducive to the protection of the liquid lens 3.

[0076] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0077] Obviously, the embodiments described above are only some embodiments of this utility model, not all embodiments. The accompanying drawings show preferred embodiments of this utility model, but do not limit the patent scope of this utility model. This utility model can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

Claims

1. A fingerprint module embedded in a liquid lens, characterized in that, It includes: Lens mount (1); A protective ring (2) is threaded onto the top of the lens base (1) for the embedded assembly of the optical lens (21); A liquid lens (3) is disposed inside the lens base (1) and corresponds vertically to the optical lens (21) above it; The fingerprint FPC (4) is connected to the liquid lens (3) via the binding area (31); A fingerprint sensor (5) is located at the bottom of the liquid lens (3), and one end of the fingerprint FPC (4) passes through the lens base (1) to the outside and is connected to the fingerprint sensor (5). 2.The liquid lens embedded fingerprint module according to claim 1, wherein, The inner side of the lens base (1) has an internal thread groove (11), and the bottom of the protective ring (2) has an external thread groove (22). Rotating the protective ring (2) allows the external thread groove (22) to be screwed into the internal thread groove (11) to complete the assembly with the lens base (1). 3.The liquid lens embedded fingerprint module according to claim 2, wherein, The surface of the protective ring (2) is provided with a protective element (6), which can protect the connection between the external thread groove (22) and the internal thread groove (11) under the action of the protective element (6).

4. The liquid lens embedded fingerprint module according to claim 3, wherein, The protective element (6) includes a closed ring (61) fixed to the outside of the protective ring (2), and the inner side of the assembled closed ring (61) is in close contact with the surface of the lens base (1).

5. The fingerprint module with an embedded liquid lens according to claim 4, characterized in that, The inner side of the closed ring (61) has a mounting cavity (62), and an elastic sealing rubber ring (63) is fixed on the side wall of the mounting cavity (62).

6. The fingerprint module with an embedded liquid lens according to claim 5, characterized in that, The elastic sealing rubber ring (63) protrudes outside the mounting cavity (62) in its natural state, so that the elastic sealing rubber ring (63) is compressed and fits in an interference fit.

7. The fingerprint module with an embedded liquid lens according to claim 1, characterized in that, The lens base (1) has an outlet groove (12) on its surface, and the fingerprint FPC (4) bound to the liquid lens (3) is led out of the lens base (1) through the outlet groove (12).

8. The fingerprint module with an embedded liquid lens according to claim 7, characterized in that, The fingerprint FPC (4) extending from the outside of the lens base (1) is bent at the bottom of the lens base (1) for the assembly of the fingerprint sensor (5).

9. The fingerprint module with an embedded liquid lens according to claim 1, characterized in that, The inner side of the lens base (1) has a mounting boss (13), and the liquid lens (3) is fixed to the mounting boss (13) by optical glue, so that the top and bottom of the liquid lens (3) are separated from the corresponding optical lens (21) and fingerprint sensor (5) by a gap height.

10. The fingerprint module with an embedded liquid lens according to claim 1, characterized in that, The fingerprint FPC (4) is fixed with a steel sheet reinforcement plate on the other side relative to the fingerprint sensor (5), and the other end of the fingerprint FPC (4) is connected to the external main control board.

Images