An anti-static interference fingerprint identification device

Abstract

The utility model discloses an antistatic interference's fingerprint identification device, including fingerprint identifier, the fingerprint identifier includes base plate, fingerprint identification chip, static protection layer, annular copper sheet, touchpad and sealing washer, the base plate includes polyimide layer and static discharge layer, the inner bottom wall of base plate is connected with the bottom surface of fingerprint identification chip through insulating gum, the annular copper sheet is set in the external surface of fingerprint identification chip. The device through touchpad's design, touchpad adopts indium tin oxide glass to make, can realize good touch response function, can guarantee the optical performance of fingerprint identification not to be influenced, and touchpad is convenient to gather static electricity, through static protection layer conduction to annular copper sheet, then utilize annular copper sheet to guide static electricity charge to ground wire, then through the connection of ground wire and static discharge layer, it is convenient to release static electricity to the ground, realizes the discharge of static electricity, and greatly reduced the interference of static electricity to fingerprint identification chip.

Description

Technical Field

[0001] This utility model relates to the field of fingerprint recognition technology, and in particular to a fingerprint recognition device that is resistant to electrostatic interference. Background Technology

[0002] As an important part of the field of biometric identification, fingerprint recognition technology has been widely used in many fields, such as unlocking electronic devices, access control systems and financial security verification, thanks to its convenience, security and uniqueness. In practical applications, fingerprint recognition devices need to frequently come into contact with the user's fingers, and the human body is very prone to accumulating static electricity in daily activities. This static electricity may generate high voltage and current at the moment of contact.

[0003] Existing fingerprint recognition devices have many shortcomings in terms of anti-static properties. Electrostatic discharge may damage the internal components of the fingerprint recognition chip, causing partial or complete loss of the chip's function, which in turn affects the accuracy and stability of fingerprint recognition and is not conducive to current use. Therefore, we propose a fingerprint recognition device with anti-static interference to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a fingerprint recognition device that is resistant to electrostatic interference, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An anti-static fingerprint recognition device includes a fingerprint recognizer, which comprises a substrate, a fingerprint recognition chip, an electrostatic protection layer, an annular copper sheet, a touch panel, and a sealing ring. The substrate comprises a polyimide layer and an electrostatic discharge layer.

[0007] In a further embodiment, the inner bottom wall of the substrate is connected to the bottom surface of the fingerprint recognition chip through insulating adhesive, and the annular copper sheet is sleeved on the outer surface of the fingerprint recognition chip.

[0008] In a further embodiment, the bottom surface of the annular copper sheet is connected to the inner bottom wall of the substrate, and a ground wire is connected to the bottom surface of the annular copper sheet. One end of the ground wire passes through the substrate and extends to the bottom of the substrate.

[0009] In a further embodiment, the bottom surface of the electrostatic protective layer is connected to the upper surface of the fingerprint recognition chip, and the bottom surface of the electrostatic protective layer is connected to the upper surface of the annular copper sheet.

[0010] In a further embodiment, the sealing ring is fitted onto the outer surface of the annular copper sheet, and the bottom surface of the sealing ring is connected to the inner bottom wall of the substrate.

[0011] In a further embodiment, the bottom surface of the touch panel is connected to the upper surface of the electrostatic protective layer, and the bottom surface of the touch panel is connected to the sealing ring.

[0012] In a further embodiment, two mounting plates are connected to both the left and right sides of the substrate, and each mounting plate has a through hole on its upper surface.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This device utilizes a touchpad design made of indium tin oxide glass, which provides excellent touch sensing while ensuring that the optical performance of fingerprint recognition remains unaffected. Furthermore, the touchpad facilitates the conduction of collected static electricity through an electrostatic discharge shield to a ring-shaped copper plate. The ring-shaped copper plate then guides the static charge to the ground wire, which, through its connection to the electrostatic discharge layer, easily releases the static electricity to the ground, significantly reducing interference from static electricity with the fingerprint recognition chip. Attached Figure Description

[0015] Figure 1 A schematic diagram of the overall three-dimensional structure of a fingerprint recognition device resistant to electrostatic interference;

[0016] Figure 2 A top-view 3D structural diagram of a fingerprint reader designed to resist electrostatic interference;

[0017] Figure 3 A frontal cross-sectional view of a fingerprint reader for an anti-static fingerprint recognition device;

[0018] Figure 4 A side view of the three-dimensional structure of a fingerprint reader for an anti-static fingerprint recognition device;

[0019] Figure 5 A side cross-sectional view of a fingerprint reader for an anti-static fingerprint recognition device.

[0020] In the diagram: 1. Mounting plate; 2. Substrate; 201. Polyimide layer; 202. Static discharge layer; 3. Through hole; 4. Touch panel; 5. Fingerprint reader; 6. Ground wire; 7. Fingerprint recognition chip; 8. Insulating adhesive; 9. Annular copper sheet; 10. Static protection layer; 11. Sealing ring. Detailed Implementation

[0021] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable 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 this utility model based on the specific circumstances.

[0023] The technical solutions of the present utility model 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 utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-5 In this utility model, a fingerprint recognition device with anti-static interference includes a fingerprint recognizer 5. The fingerprint recognizer 5 includes a substrate 2, a fingerprint recognition chip 7, an electrostatic protection layer 10, an annular copper sheet 9, a touch panel 4, and a sealing ring 11. The substrate 2 includes a polyimide layer 201 and an electrostatic discharge layer 202.

[0025] The inner bottom wall of substrate 2 is connected to the bottom surface of fingerprint recognition chip 7 via insulating adhesive 8. An annular copper sheet 9 is fitted onto the outer surface of fingerprint recognition chip 7. The design of the annular copper sheet 9 facilitates the guidance of electrostatic charge to ground line 6. The bottom surface of the annular copper sheet 9 is connected to the inner bottom wall of substrate 2, and the bottom surface of the annular copper sheet 9 is connected to ground line 6. One end of ground line 6 penetrates substrate 2 and extends to the bottom of substrate 2. Through the cooperation of annular copper sheet 9 and ground line 6, it is easy to guide static electricity to electrostatic discharge layer 202 to release static electricity. The bottom surface of electrostatic protection layer 10 is connected to the upper surface of fingerprint recognition chip 7, and the bottom surface of electrostatic protection layer 10 is connected to the upper surface of annular copper sheet 9. The electrostatic protection layer 10 facilitates the suppression of the accumulation and conduction of electrostatic charge, and plays a preliminary electrostatic protection role.

[0026] A sealing ring 11 is fitted onto the outer surface of the annular copper sheet 9. The bottom surface of the sealing ring 11 is connected to the inner bottom wall of the substrate 2. The bottom surface of the touch panel 4 is connected to the upper surface of the electrostatic protection layer 10. The bottom surface of the touch panel 4 is connected to the sealing ring 11. The connection between the touch panel 4 and the sealing ring 11 facilitates the sealing connection between the touch panel 4 and the substrate 2, ensuring the airtightness of the device and preventing dust and moisture from entering. Two mounting plates 1 are connected to the left and right sides of the substrate 2. Each mounting plate 1 has a through hole 3 on its upper surface. The design of the mounting plate 1 and the through hole 3 makes it easy to install the device in the usage position.

[0027] The working principle of this utility model is as follows:

[0028] When in use, if a finger touches the touchpad 4 and the finger carries static electricity, the static charge is first collected by the touchpad 4, then conducted through the static protection layer 10 to the annular copper plate 9, and the annular copper plate 9 guides the static charge to the ground wire 6. Then, the ground wire 6 is connected to the static discharge layer 202, and the static electricity is released to the ground through the static discharge layer 202, realizing the discharge of static electricity and greatly reducing the interference and damage of static electricity to the fingerprint recognition chip 7.

[0029] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0030] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A fingerprint recognition device resistant to electrostatic interference, characterized in that: The device includes a fingerprint reader (5), which includes a substrate (2), a fingerprint recognition chip (7), an electrostatic protection layer (10), an annular copper sheet (9), a touch panel (4), and a sealing ring (11). The substrate (2) includes a polyimide layer (201) and an electrostatic discharge layer (202).

2. The fingerprint recognition device against electrostatic interference according to claim 1, characterized in that: The inner bottom wall of the substrate (2) is connected to the bottom surface of the fingerprint recognition chip (7) through insulating glue (8), and the annular copper sheet (9) is sleeved on the outer surface of the fingerprint recognition chip (7).

3. The fingerprint recognition device against electrostatic interference according to claim 1, characterized in that: The bottom surface of the annular copper sheet (9) is connected to the inner bottom wall of the substrate (2), and a ground wire (6) is connected to the bottom surface of the annular copper sheet (9). One end of the ground wire (6) passes through the substrate (2) and extends to the bottom of the substrate (2).

4. The fingerprint recognition device against electrostatic interference according to claim 1, characterized in that: The bottom surface of the electrostatic protective layer (10) is connected to the upper surface of the fingerprint recognition chip (7), and the bottom surface of the electrostatic protective layer (10) is connected to the upper surface of the annular copper sheet (9).

5. The fingerprint recognition device against electrostatic interference according to claim 1, characterized in that: The sealing ring (11) is fitted on the outer surface of the annular copper sheet (9), and the bottom surface of the sealing ring (11) is connected to the inner bottom wall of the substrate (2).

6. The fingerprint recognition device against electrostatic interference according to claim 1, characterized in that: The bottom surface of the touch panel (4) is connected to the upper surface of the electrostatic protection layer (10), and the bottom surface of the touch panel (4) is connected to the sealing ring (11).

7. The fingerprint recognition device against electrostatic interference according to claim 1, characterized in that: The substrate (2) has two mounting plates (1) connected to its left and right sides, and each mounting plate (1) has a through hole (3) on its upper surface.

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