变焦距镜头凸轮曲线形式的选择

晏蕾; 贾平; 洪永丰; 王平

变焦距镜头凸轮曲线形式的选择

晏蕾^1,2, ,,
贾平¹,
洪永丰¹,
王平¹

1.
中国科学院长春光学精密机械与物理研究所,吉林长春130033;
2.
中国科学院研究生院,北京100039

详细信息

通讯作者:
晏蕾(1985-)，男，湖北孝感人，硕士研究生，主要从事变焦距光学系统的设计研究工作。

中图分类号: TN942.2
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出版历程
- 刊出日期: 2010-12-01

Selection of cam curve for zoom lens

1.
Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences, Changchun 130033,China;
2.
Graduate University of Chinese Academy of Sciences,Beijing 100039,China

摘要

摘要: 在变焦镜头设计的最后阶段需要进行凸轮曲线的设计，为了平衡成像倍率变化的均匀性与凸轮转角，需要选择合适的凸轮曲线形式，要求建立成像倍率M与凸轮转角之间的某种函数关系。根据凸轮曲线所要满足的实际边界条件和函数连续性，建立M与几种常见的函数关系，利用Matlab对设计实例进行仿真。结果表明：建立的成像倍率M和凸轮转角的幂函数关系及压力升角都不超过允许值时，变倍倍率变化均衡性最好，倍率变化曲线平滑，且无凸轮拐点。该方法可以方便设计人员针对不同设计要求改变凸轮曲线形状，找到最佳变倍凸轮曲线。
- 变焦距镜头 /
- 凸轮曲线 /
- 压力升角
Abstract: In the final course of zoom lens design, the cam curves have to be designed. In addition, in order to balance the uniformity between imaging magnification change and cam corner, the appropriate cam curve should be chosen. So it is important to establish the relationships between imaging magnification M and cam corner . Based on the boundary conditions and the continuity of the function whcih cam curves have to meet, some functions are established and discussed. Some design examples were simulated with Matlab, which indicates that the exponential function fits well with M and . Besides, the pressure angle is less than the permitted value and the uniformity of cam curves is better and smooth without cam inflexions. Compared with other solutions used before, this method helps the designer to modify the cam curves effectively and find the best cam curves of the zoom lens.
- zoom lens /
- cam curve /
- pressure ascending angle

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参考文献(1)

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