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一问题的提出到目前为止,在机械补偿的变焦距光学系统中,均采用凸轮(平面或空间形式的凸轮)机构控制变倍和补偿透镜组的运动,以满足光学系统的成象质量和象面位置稳定的要求。由于变倍与补偿透镜组动态位置精度要求很高,故对变倍曲线和补偿曲线的要求很严,使凸轮加工工艺的难度增大。为了加工这种精密的凸轮,一般要在专用的精密设备,如专用铣床或线切割机床上进行。如果没有这种设备,加工凸轮,生产机械补偿的变焦距镜头是不可能
PROBLEM TO BE SOLVED By now, in a mechanically compensated zoom optical system, a cam (a cam in the form of a plane or a space) is used to control the zooming and the movement of the lens group to compensate for the imaging quality and the image of the optical system Face stable position requirements. Due to the high requirements of the dynamic position accuracy of the zoom lens and the compensation lens group, the requirements on the zooming curve and the compensation curve are very strict, which makes it more difficult to process the cam. In order to process this precision cam, generally in special precision equipment, such as special milling machine or wire cutting machine. Without this type of equipment, it is not possible to machine cams to produce compensated mechanical zoom lenses