常用的两运动组元等间距光学变焦驱动设计方法和等程距设计方法都存在曲线局部压力角难以控制的问题。论述一种基于基线交换的光学变焦驱动设计方法,该方法通过在合适的变焦曲线位置交换基线(主驱动曲线),从而解决曲线局部压力角(曲线在光轴方向切角的余角)控制的问题,保证了整个变焦过程中的主驱动曲线压力角一致性、扭矩力均匀性和变焦平滑性,同时不降低变焦过程的快速性。讨论了辅助程序设计的实现情况和实践中出现的问题的解决途径。理论和实践证明,这种变焦驱动设计方法是一种效果颇佳的设计优化手段。 The commonly used two-motion element equal-pitch optical zoom drive design method and the equal distance design method all have the problem that the local pressure angle of the curve is difficult to control. An optical zoom drive design method based on baseline swapping is discussed. The method solves the problem that the local pressure angle (the corner of the curve in the optical axis) is controlled by exchanging the baseline (main driving curve) at the appropriate zooming curve position Problem, to ensure that the main driver throughout the zooming process pressure angle consistency, torque uniformity and zooming smoothness, without reducing the speed of the zooming process. The realization of auxiliary program design and the solution of the problems appeared in practice are discussed. Theory and practice have proved that this zoom-driven design method is a good design optimization method.