口径自适应光学透镜中心厚度测量方法及装置

Diameter-adaptive method and apparatus for center thickness measurement of optical lens

透镜作为光学系统中的核心部件之一,其加工质量极大影响着光学系统的使用性能。其中,透镜中心厚度的偏差对整个光学系统成像质量的影响最大。现有的非接触式和接触式测量设备都存在着一些缺点,因此本文提出了一种口径自适应光学透镜中心厚度测量方法,并基于此方法设计和搭建了一套透镜中心厚度测量装置,进行了测量精度对比和重复性测量实验。结果表明,本文所研究的测量装置误差与产线上所使用的测量装置误差相当,满足对光学透镜的检测要求。本装置具有结构简单可靠、操作方便、测量精度高且可以节省光学透镜生产成本等优点,已在生产线得到应用。

As one of the key components of an optical system, the processing quality of the lens greatly affects the performance of the optical system. The variation of the lens’ center thickness has the most significant impact on the overall imaging quality of the optical system. The existing noncontact and contact measurement equipment has some shortcomings. Therefore, this paper proposes a diameter adaptive method for measuring the center thickness of a lens. Based on this method, a set of lens center thickness measurement device was designed and built. The measurement accuracy comparison and the repeatability measurement test are carried out. The results show that the error of the measurement device studied in this paper is comparable to the error of the measurement device used in the production line, which meets the detection requirements of optical lenses. The device has the advantages of simple and reliable structure, convenient operation, high measurement accuracy, and saving the production cost of optical lenses, and has been used in production lines.