Multi-axis active aligning method for mobile phone camera module

Abstract

The invention provides a multi-axis active aligning method for a mobile phone camera module. The multi-axis active aligning method comprises the following steps of according to an optimum image quality index value obtained by all preset image local measuring areas, calculating the deviation between the center of a lens and the center of an image sensor bottom plate in the X-Y direction; calculating the step number of a motor which is used for controlling the lens to move in the X-Y direction; changing the position of the lens in the Z-axis direction, recording the position of the lens each time after changing, and a photo of an image detection plate shot by an imaging system at the position; calculating the corresponding position of the lens when the obtained image quality index of the preset image local measuring area of all photos is optimum, and calculating the difference of the lens positions when the optimum image quality index is obtained at the center of the image; according to the distance difference, calculating the step number of the motor for controlling the rotation of the lens to ensure the lens is parallel, and moving the motor to correct the tilting of the lens. The multi-axis active aligning method has the advantages that the aligning result is accurate and stable, the efficiency is high, and the multi-axis active aligning method is suitable for the production of various types of high-end mobile phone camera modules.

Description

technical field [0001] The invention relates to the field of automated manufacturing, in particular to a multi-axis active alignment method for a mobile phone camera module. Background technique [0002] With the increasing popularity of smart phones, the smart phone market has gradually changed from the new phone market to the replacement market. The demand for replacement will be the main driving force for maintaining the development of the smart phone market in the future, and the demand for high-end smart phones will continue to increase . As the main component of high-end smartphones, there is a huge market demand for high-end mobile phone cameras. [0003] Generally, only the distance between the lens and the image sensor plane is calibrated when the camera module of the low-end mobile phone is packaged, and the center offset and tilt of the lens are detected during the finished product, and the modules that do not meet the performance indicators are regarded as defec...

AI Technical Summary

Problems solved by technology

[0004] At present, the multi-axis active alignment of high-end mobile phone camera modules mainly relies on manual work. Manual alignment has the following disadvantages: (1) The alignment mainly relies on human eyes to observe the imaging effect of mobile phone camera modules, which is affected by the experience and work of workers. The state and other factors have a great influence, which is not accurate enough and the stability is low; (2) The human eye observation speed is slow and the efficiency is low; (3) Manual alignment requires workers to concentrate and is prone to fatigue. Working for a long time will reduce the accuracy and work efficiency. efficiency

At present, in terms of mobile phone camera module packaging, there are many technologies for one-dimensional focusing, such as Chinese invention patents CN201210457418.6, CN201210435895.2, utility model patents CN201220526430.3, CN201020186781.5, CN200720196777.5, etc. But these techniques cannot handle lens center shift and tilt

Chinese invention patent CN201310751376.1 provides an evaluation system and evaluation method for the inclination of lens module testing equipment, but it also fails to solve the problem of multi-axis active alignment when the camera module is packaged

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