一种调焦机构运动方向与光轴平行性测试方法

A Measurement Method of Parallel Accuracy between the Motion Direction of the Focusing Mechanism and the Optical Axis

调焦机构运动方向与光轴平行性的好坏直接影响调焦过程中光学系统主点位置、像质均匀性、像面照度均匀性等多项指标。为了在安装过程中保证调焦机构运动方向与光轴平行,需要测量调焦机构运动方向与光轴之间的角度关系。文章通过三坐标测量系统和自准直经纬仪,设计了一种对感光元件非接触式的测量方法,来测量调焦机构运行方向与焦平面法线方向之间的角度关系,通过结构设计与加工补偿实现两者的平行装调。试验结果表明,调焦机构运动方向与焦平面法线方向的角度测量模型准确可靠,数据处理算法合理可行。

Parallelism between focusing-mechanism motion direction and optical axis influences the principal point position, image quality uniformity, and illumination uniformity, etc. The measurement of angular deviation between focusing-mechanism motion direction and optical axis is necessary to satisfy this parallelism parameter requirements. A non-contact measurement method by means of three-coordinate measuring machine and collimation theodolite is provided in this article, which can measure the angle between focusing-mechanism motion direction and optical axis. By structural design optimization and machining compensation, parallel alignment is realized. Testing results demonstrate that the measurement method is accurate and reliable, and the data processing is reasonable.