Mobile phone rear camera protection glass lens, the traditional mobile phone camera lens is just a glass lens, there is no protection device, in the use process when the phone accidentally dropped, the lens will fall destroyed, or there is dust or moisture into the camera surface, resulting in the phone can not take pictures. The installation process is an important part of the gap detection and control, i.e. the installation fit, by using a spectral confocal sensor to measure the size of the gaps on the surface of the protective sheet for process control.

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