Optical fingerprint automatic focusing device

Abstract

The invention provides an optical fingerprint automatic focusing device, which includes a sensing module, an imaging module and a controlling module, wherein the sensing module includes a circuit board and a sensing device on the circuit board; the imaging module includes a lens compartment, a lens assembly and an image sensor; the lens compartment has a vertical-through inner cavity and is arranged on the circuit board; the lens assembly is embedded at the upper end of the lens compartment and can move along the inner wall of the lens compartment; the image sensor is fixed on the circuit board, is arranged in the inner cavity of the lens compartment, and is directed at the lens assembly; the controlling module includes an adjusting device and a controller; the adjusting device is fixed at the upper end of the lens assembly; the controller is connected with the circuit board and the adjusting device; and the sensing device senses the image obtained by the image sensor and transmits the image to the controller, and the controller compares the image with the preset image, so as to drive the adjusting device to adjust the position of the lens position to enable the image to be consistent with the preset image. The optical fingerprint automatic focusing device more precisely adjusts the focal length, ensures the consistence of the product, and improves the productivity.

Description

technical field [0001] The invention relates to an optical fingerprint focusing device, in particular to an optical fingerprint automatic focusing device. Background technique [0002] The fingerprint collector is the input device of the fingerprint identification system, which can be widely used in fingerprint locks, attendance systems, mice with fingerprint identification functions, key mobile phones and other devices, and can also be used for fingerprint comparison and collection in public security systems. In existing optical fingerprint collectors, manual focus is mainly used when performing focus adjustment. However, manual focusing is less efficient, resulting in reduced productivity. Moreover, the focal length obtained through manual focusing is not accurate enough, which will affect the image quality, and finally will affect the consistency of the product. [0003] In view of this, how to design an optical fingerprint auto-focusing device to improve productivity a...

AI Technical Summary

Problems solved by technology

[0004] In view of the low efficiency and inaccuracy of manual focusing in the prior art, which leads to unclear imaging and affects the consistency of products, the present invention provides an optical fingerprint automatic focusing device

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