Effect and control of central deviation on the imaging quality of high magnification continuous zoom TV

In order to meet the requirements of high imaging quality and high resolution for high magnification continuous zoom TV, the main factors affecting the imaging quality are analyzed. The effects of eccentricity on the MTF of the optical system were analyzed by CODE V optical software. According to the analysis results, the lenses of the former group are most sensitive to the optical system and have the greatest influence on the image quality of the system. The tolerance value of the center deviation control of the lens is determined. Aiming at each lens of the front mirror group, a centering structure of the micro stress adhesive lens is proposed. The center error control method of lens is realized by optical axis calibration technology. As the moving component of the system, the zoom lens group and the compensation lens group are the key factors affecting the system image quality during the zooming process. It is proposed that the mechanical centering method is used to make the axis of motion consistent with the axis of the front mirror group. Then, The optical axes of the zoom group, compensation mirror group, rear mirror group, and front mirror group are consistent by a reflective optical centering method. By comparing the test results with the theory, the accuracy and feasibility of the center deviation control method are verified, and the design requirements of the system are satisfied.