Measurement and Calculation Method of Optical Axis Tilt of Adjustable Focus Camera Module

Abstract

A method for testing and calculating the tilt of the optical axis of the adjustable focus camera module, comprising the following steps: (S01) performing a defocus curve test on several adjustable focus camera modules, and extracting each focusable camera module respectively. The motor stroke of the module when the image is clearest at the upper left, upper right, lower left, and lower right of a module test image; (S02) input the above test results into a calculation analysis compiling software, and use it to calculate each camera module A least squares plane fitting residual error, an image optical axis tilt size and direction, and the average image optical axis tilt size and direction of all adjustable focus camera modules; and (S03) according to the adjustable focus camera module The imaging direction of the group converts the image optical axis inclination into the module optical axis inclination.

Description

technical field [0001] The invention relates to the technical field of camera modules, in particular to a method for testing and calculating the tilt of the optical axis of an adjustable-focus camera module. Background technique [0002] Resolution is the ability to distinguish the details of the original subject. Furthermore, the resolution is a physical quantity used to describe the ability of the microfilm system to reproduce the subtle parts of the original, and it is an important index for image quality evaluation. In other words, the resolution is the most important performance parameter of the adjustable-focus camera module, and the main factors affecting the resolution of the adjustable-focus camera module are the matching between the lens and the photosensitive chip, motor performance, incoming material tolerance, assembly tolerance, etc. . In addition, the optical axis tilt of the adjustable focus camera module is an important index for studying the resolution of...

AI Technical Summary

Problems solved by technology

This estimation method considers that the tilt of the optical axis of the adjustable-focus camera module is approximately equal to the maximum difference between the four tilt heights divided by the diagonal distance of the field of view of the chip of 0.8, but this estimation method cannot obtain an accurate tilt of the optical axis size, and the direction of inclination cannot be quantified, and the measurement lacks credibility

Moreover, when it is necessary to perform mold repair or glue replenishment on the lens base of the camera module to correct the tilt of the optical axis, this estimation method cannot quantitatively determine the specific position and amount of mold repair or glue replenishment of the mirror base, and there is a problem A large number of subjective factors are not conducive to the improvement of the camera module manufacturing process

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