Anti-static sliding fingerprint acquisition module

Abstract

The invention provides an anti-static sliding fingerprint acquisition module, including a printed circuit board, a sliding sensor chip and a metal shell. The anti-static slide fingerprint acquisition module provided by the invention adopts a commonly used printed circuit board material and is designed into a miniaturization stamp paste way easy for welding; the sliding sensor chip is arranged on the printed circuit board in a surface mounting manner by adopting a low-cost COB bonding method; a conductive ESD discharge metal shell with windowing design is embedded on the sliding sensor chip; and a ground lug is welded on an ESD grounding pad of the printed circuit board. When a finger contacts the sliding sensor chip, the finger always contacts with the conductive metal shell first, thereby effectively discharging the static electricity on the finger to the ground and preventing damage to the sliding sensor caused by electrostatic discharge.

Description

technical field [0001] The invention relates to a fingerprint collection module, in particular to an anti-static sliding fingerprint collection module Background technique [0002] As a security application, biometrics has long been used in the field of criminal investigation due to its ease of use and unforgeability to a certain extent. In recent years, the demand for identity authentication has been increasing. With the gradual acceptance and recognition of the public, the automatic fingerprint identification system will be more widely used. The sliding fingerprint sensor detects fingerprints by sliding a finger on the surface of the strip sensor. It has the advantages of small size, low power consumption, and low price. It is suitable for applications such as mobile phones, smart phones, PDAs, USBKeys, or mobile storage devices. [0003] Static electricity is mostly generated by the friction between insulator objects or the friction between dry air and insulators. When i...

AI Technical Summary

Problems solved by technology

Since the human body will carry static electricity, when the finger is in contact with the sliding fingerprint sensor chip, the electrostatic discharge will damage the fingerprint sensor chip, and even cause electrostatic breakdown of the fingerprint sensor chip and cause chip damage

[0004] In order to make the fingerprint sensor chip resist the influence of electrostatic discharge, the traditional method is to make a bare metal layer on the surface of the fingerprint sensor chip, generally using a gold-plating process, so that the static electricity close to the surface of the fingerprint sensor chip can be conducted to the ground of the system. However, the semiconductor process for making this metal layer with a thickness of several microns is very complicated. The biggest problem is that the gold plating process is incompatible with the standard CMOS manufacturing process because of the metal element gold to be introduced, and the manufacturability is poor. The rate is very low and the production cost is very high

And the traditional sliding sensor adopts the LGA plastic package with window opening, which is also a special-shaped package, which is not compatible with the standard LGA package. and very high manufacturing costs

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