In the field of modern optical measurement, the center thickness is a basic parameter of the optical lens, which will directly, affects the accuracy of the lens’ focal length and other optical parameters, and these parameters have great influence on overall performance of the optical system. Therefore center thickness requires precision test. Nowadays, the methods include contact measurement and non-contact measurement. Generally speaking, the center thickness of the lens with no hole in the center only could be measured through the both methods. The lens with a hole in the center is used widely, on the basis of principle of contact measurement, a method of measuring center thickness of the lens with a hole is proposed. A sign convention about radius and sagitta of curvature is defined and the geometrical expressions are derived in detail. Analyses and simulations between the errors of center thickness and variables are shown. To prove the right of the method, an experiment is done in use of a lens with no hole in the center. The results of indirect and direct measurements are presented, respectively. In comparison of direct measurement, the proposed method has a high precision.

针对瑞士威力铭公司W518S加工中心进行了五轴联动加工的UG后置处理设计研究.其具体内容包括:FANUC数控系统五轴联动专用模块程序的特点及相关指令介绍;五轴联动后置处理设置内容介绍;特殊指令的TCL程序语言说明;叶轮等试验零件五轴联动加工等.通过对成熟使用的UG五轴联动后置处理开发的介绍,为其他设备的UG五轴联动后置处理开发提供了借鉴.

The paper analyzed the current situation of communication and management of NC equipment,it also expoun-ded the data management system of CIMCO DNC,and introduced the solution system based on numerical control equipment and NC program management in details.

According to the requirement of automatic focusing in HUD parallax measuring principles,an inner focusing objective of larger relative aperture and focusing range was designed.In order to eliminate the defects in traditional design,the selected lens groups are assembled into a system and multi-configuration method is adopted to optimize the length of different object distance.In this way,the problem of uncontrollability of short-distance imaging quality was solved.The newly designed inner focusing lens performed well and stable under different object distance,MTF values are above 0.4 both on the optical axis and off-axis in infinite distance when the spatial frequency is 120lp/mm,0.3 on the optical axis at 300mm;the off-axial sagittal of arc is 0.3 and meridian is 0.2,and the relative distortion is confined within 1%.All achieved makes the after-treatment of the image more convenient.