减小变焦系统凸轮曲线压力角的方法

Method for Reducing Pressure Angle of Cam Curve in Zoom System

为了使机械补偿的连续变焦光学系统可以连续、平稳地成像,提出了一种减小变焦系统凸轮曲线压力角的方法.改变变倍曲线方程,运用动态光学原理,拟合的补偿曲线的压力角有明显减小趋势.原始设计变倍曲线的压力角为31.4°,补偿曲线的最大压力角大于50°.运用插值法改变变倍组方程,得到的变倍曲线的最大压力角小于37°,补偿曲线的最大压力角小于23°,得到的新的凸轮曲线满足曲线压力角小于45°的要求.实际光学系统检测的结果证明了这种方法的可行性.该方法可以有效地减小凸轮曲线的压力角,实际变焦系统能够连续清晰地成像.

In the design of continuous zoom optical system with mechanical compensation,in order to make the zoom system image continuously and smoothly,this paper proposes a method to reduce the cam curve pressure angle of the zoom system.By changing the equation of the zoom curve and applying the principle of dynamic optics,the pressure angle of the fitted compensation curve has a significant decreasing trend.In the original design,the pressure of the zoom curve is 31.4°,and the maximum pressure angle of the compensation curve is greater than 50°.Using the interpolation method to change the equation of the variable magnification group to obtain a new cam curve,the maximum pressure angle of the zoom curve is less than 37° and the maximum pressure angle of the compensation curve is less than 23°.A new cam curve is obtained that satisfies the requirement that the curve pressure angle is less than 45°.The results of the actual optical system test prove the feasibility of this method.By this method,the pressure angle of the cam curve can be reduced,the actual zoom system can image continuously and clearly.