用OZSAD软件实现复合式变焦凸轮曲线优化设计

变焦距光学系统凸轮曲线设计是保证光学系统变焦精确、平滑和驱动力均衡的关键。以2运动组元变焦系统的牛顿法变焦推导公式为依据，分析等间隔设计和等角距设计凸轮曲线方法的特点，结合EBA20X10光学镜头设计实例，探讨了结合2者优点实现复合式凸轮曲线优化设计的方法。文中等间距是指变倍透镜组沿光轴的移动量与凸轮转角呈线性关系，凸轮曲线沿圆周展开为直线；等角距是指系统焦距与凸轮转角呈线性关系。最后介绍了可实现3种凸轮曲线辅助设计的软件工具OZSAD V1.2。设计结果表明，该设计方法可以降低凸轮曲线压力角，减少总展开角及加工点对数，还可保证凸轮的设计精度。     

Anti-detection technology of cat eye target based on decentered field lens

Optoelectronic imaging equipment is easy to expose to active laser detection devices because of "cat eye" effect. In this paper, we propose a new structure of optical system to reduce the retroreflector effect of a cat eye target. Decentered field lens structure is adopted in the design without sacrificing imaging quality and clear aperture. An imaging system with±30° field of view is taken for example. The detailed design and simulation results are presented. The results indicate that this kind of optical system can reduce the retroreflection signal substantially and maintain acceptable imaging performance.