Light choppers

Abstract

The invention relates to an optical chopper, which comprises a motor, a modulation reticle arranged on a rotating shaft of the motor and a polarizer arranged at the terminal of the rotating shaft of the motor; the rotating shaft is provided with an axial through hole. The optical chopper has the advantages that, the modulation reticle and the polarizer fixed on the rotating shaft of the motor respectively and simultaneously performs mechanical modulation to reference light and measurement light, therefore, measuring equipment is greatly simplified, and measuring accuracy and convenience are improved.

Description

technical field [0001] The invention relates to an optical chopper, in particular to an optical chopper with a modulation disc and a polarizer. Background technique [0002] The thickness of the liquid crystal layer of a liquid crystal display plays an important role in image quality. Therefore, the thickness of the liquid crystal layer is listed as one of the important monitoring parameters in the manufacturing process of the liquid crystal display. [0003] At present, there are many light modulation methods used to measure the thickness of the liquid crystal layer, including acousto-optic, electro-optic, magneto-optical modulation, and mechanical modulation. Among them, although the frequency adjustment range of the mechanical modulation method is not large, it is suitable for low-frequency modulation and has low cost, so it has been widely used. [0004] However, the optical chopper used in the existing mechanical modulation method can only modulate the reference light,...

AI Technical Summary

Problems solved by technology

[0004] However, the optical chopper used in the existing mechanical modulation method can only modulate the reference light, and the measurement optical signal needs to be processed by other devices

This is obviously not conducive to simplifying the equipment and improving the convenience of measurement

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