Optical system for optical axis calibration and optical axis calibration method

Abstract

The invention provides an optical system for optical axis calibration and a optical axis calibration method. The optical system comprises a light source, a spectroscope, a first reflector, a second reflector and a detection assembly, wherein the light source, the spectroscope and the first reflector are sequentially arranged on a first straight line, the light source emits light beams towards the spectroscope, the second reflector is opposite to the first reflector, the detection assembly and the spectroscope are arranged on a second straight line, and the first straight line intersects with the second straight line; the light source emits a light beam which passes through the spectroscope to form a first light beam, and the first light beam is reflected by the spectroscope to form a second light beam; the first light beam is reflected by the first reflecting mirror and the second reflecting mirror in sequence to enter the camera module; the second light beam enters the detection assembly, and the first light beam and the second light beam have a uniquely determined corresponding relation; and the optical system is adjusted to enable the angle of the first light beam to meet the calibration requirement, and the optical axis of the camera module is set to coincide with the first light beam to realize optical axis calibration of the camera module.

Description

technical field [0001] The invention belongs to the technical field of structure correction of camera modules, and in particular relates to an optical system for optical axis calibration and an optical axis calibration method. Background technique [0002] When the camera module is installed on the bracket, it is necessary to adjust the relative positional relationship between the camera module and the bracket, mainly the optical axis calibration (active alignment, AA) of the camera module, so that when the bracket is installed on the mobile terminal, the camera The module can match the structure of the mobile terminal, and make the mobile terminal have better image quality. [0003] The optical axis calibration of the existing camera module is mainly calibrated through the resolution test card of the camera module, and it is often difficult to determine the specification through the resolution test card calibration. When the specification is too strict, it will increase th...

AI Technical Summary

Problems solved by technology

[0003] The optical axis calibration of the existing camera module is mainly calibrated through the resolution test card of the camera module, but it is often difficult to determine the specifications through the resolution test card calibration

When the specification is too strict, it will increase the difficulty of calibration; when the given specification is too loose, it is easy to cause the position deviation of the camera module, resulting in poor imaging

Moreover, the camera module often has a certain relative angle with the support, and the prior art cannot calibrate the camera module with the relative angle.

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