:针对实现系统变焦的传统机械方法 ,提出了以微处理机技术取代凸轮传动从而实现系统变焦的方法。这种方法的原理是利用微处理机、步进电机产生指令控制 ,经过较为简单的传动链后完成变焦要求。通过实验调试 ,证明这种电子学方法能够较好地完成变焦并达到精度要求 ,是一种可行的方法。 Aiming at the traditional mechanical method to realize the system zooming, a method of using the microprocessor technology to replace the cam transmission to realize the system zooming is proposed. The principle of this method is the use of microprocessors, stepper motor command control, after a relatively simple transmission chain to complete the zoom requirements. Through experimental debugging, it is proved that this kind of electronic method can accomplish the zoom and achieve the precision requirement well, which is a feasible method.