Image acquisition system

Abstract

The invention discloses an image acquisition system which adopts a micro electro mechanical system (MEMS) technology, and provides an alternate image acquisition method and a working mode for preassigning a lens shifting position. By means of the method, the quality of images collected by the image acquisition system can be better, the image collecting speed is not affected, and therefore the work efficiency of an image acquisition device is higher. The image acquisition system comprises a movable lens set, a fixed lens set and an image sensor chip, wherein the movable lens set, the fixed lens set and the image sensor chip are arranged in sequence. The image sensor chip is in communication with a processor. The processor is used for collecting and processing image data from an image sensor, and for barcode decoding or character recognition. The processor drives an MEMS chip connected with the movable lens set through an MEMS chip driving circuit. The movable lens set moves in the axial direction so as to form a focusing position varying system or a focal length optical system with the fixed lens set.

Description

[0001] technical field [0002] The invention relates to an image acquisition system. Background technique [0003] At present, image acquisition devices have been widely used in technical fields such as barcode scanning and optical character recognition. According to whether the focus position can be changed, the image acquisition system can be divided into two types: fixed focus position and variable focus position. According to whether the focal length can be changed, the image acquisition system can be divided into two types: fixed focal length and variable focal length. Compared with fixed focus position or fixed focus distance, the application of variable focus position and variable focal length can make the depth of field of the system larger, so the captured image clarity is higher. [0004] In order to achieve variable focus position or variable focal length, voice coil motor (VCM), piezoelectric motor, liquid lens and liquid crystal head technologies are usually...

AI Technical Summary

Problems solved by technology

For example, the most widely used voice coil motor technology has the advantages of low cost and fast speed, but it has high power consumption, short life, poor anti-vibration ability, and hysteresis

Piezoelectric motor technology is fast and has no hysteresis, but it is too expensive and has a short life

The advantage of liquid lens technology is low power consumption, but its reliability is not high

The advantage of liquid crystal lens technology is high reliability, but its cost is high and power consumption is large.

[0006] In summary, there are certain technical barriers to achieving higher performance image acquisition systems

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