Improve the compensation method for the camera module to shoot out of focus in a non-horizontal direction

Abstract

The invention discloses a compensation method for improving the out-of-focus shooting of a camera module in a non-horizontal direction. Based on a new sample, a normal distribution is used to simulate the compensation at a fixed near-focus distance in the upward direction and a fixed far-focus distance in the downward direction. value (upward typical value C1, downward typical value C2), the upward typical value C1 and downward typical value C2 are the code values ​​of each module in the sample with clear focus in the upward and downward directions and the code values ​​with clear focus in the horizontal direction The average value of near focus and far focus of the normal distribution of the difference △ value; this method only needs to add process stations in two directions in the early stage, and these two fixed code values ​​can be directly burned during mass production, eliminating the need for Eliminate extra processes and save manpower. According to the signals fed back from different directions during handheld shooting, the burning compensation code value can be directly invoked, which can greatly improve the failure probability in the upward and downward directions. At the same time, it improves the focusing speed and improves the user experience compared with the ordinary focusing method.

Description

technical field [0001] The invention relates to the technical field of camera modules, in particular to a compensation method for improving the out-of-focus shooting of a camera module in a non-horizontal direction. Background technique [0002] When smart phone camera modules and tablet computer camera modules with gravity sensors use VCM (Voice Coil Motor, hereinafter referred to as VCM) to focus and take pictures, affected by the self-weight of the camera module lens, in the horizontal and upward (including tilt upward) and positive upward), downward (including oblique downward and positive downward) for the same distance to focus clearly, the driving force code value of the VCM required is different. When mobile phone camera modules and tablet computer camera modules focus and take pictures, in order to ensure the consistent mass production requirements of camera module focus performance, the code of VCM when each camera module is fixed in a fixed position and clear focu...

AI Technical Summary

Problems solved by technology

Some camera smart device manufacturers with autofocus function increase the focusing range of the focusing process to accommodate the focusing performance in the upward and downward directions, but there will still be a certain proportion of out-of-focus phenomena and the increase in the focusing range will cause horizontal direction. The focus time of the camera is significantly increased, and the shaking of the hand-held camera increases the probability of out-of-focus in the horizontal direction, and the user experience is not ideal.

Images