| At present, security as a topic that more and more widely attention, is becoming more and more aroused people’s concern. In daily life, the emergence of the monitor is widely in people’s life, provides security for people’s life. Zoom system can play an important role in monitoring equipment. In the large field of view, searching target,small range of tracking, carefully identify target, zoom system has its unique advantages. In recent years due to progress of science and technology, as well as the emergence of high precision CNC machine tools,the design of aspheric machining more mature, and brings new develop characteristics. This paper mainly expounds the used to monitor the structure of the zoom optical system design method of CAM design and optimization of structure. In this paper, the main task introduces the use ZEMAX software to design a focal length in 8 mm- 100- mm zoom lens, MTF>0.2 at 80lp/mm. Design and optimize the appropriate CAM curve, the mechanical compensation method is adopted, it is easier to gear and mechanical structure with the combination of the CAM. The details of this paper mainly include the following aspects:(1) It introduces the development history and trend of the zoom system, and discuss the current research state of zoom system at home and abroad. The paper also discusses the basic concepts and basic types of zoom system, analyzes characteristics and zoom equation of traditional zoom system, and provide a theoretical basis for the back of zoom structure.(2) To solve the calculation and the 20 X zoom structure meet the design demand. Using ZEMAX design software for image quality evaluation of image quality is optimized. The evaluation results show that the 20 X zoom structure can meet the design requirement.(3) Get the CAM curve from matlab,instead of traditional Guass calculation.Because this way didn’t consider the actual of the lens. The date from matlab is more real.
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