头盔3D显示中塑料自由曲面棱镜热变形研究  

A Study of Thermal Deformation of Plastic Free Form Surface Prism in Head Mounted 3D Display

作　　者：王成彬[1,2] 杨洪波[1] 孙强[1] 吴海清[3] 

机构地区：[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 [3]长春理工大学研究生部,吉林长春130022

出　　处：《计算机仿真》2009年第7期340-342,350,共4页Computer Simulation

基　　金：国家科学基金资助项目(60507003)

摘　　要：塑料透镜热膨胀系数大,而塑料自由曲面棱镜将整个光路集成在一块镜子上,一个或几个曲面的变形会影响到整个光学系统,尽管在光学设计上各种光学参数满足要求,但在一定热载荷下的热变形会破坏这种状态。从理论上推导了透镜热变形的机理,得到了热弹性力学的位移微分方程。给出了具体分析实例,用有限元的方法分析了给定热载荷对光学系统的影响,并给出了镜面变形结果,为塑料光学系统的设计和评价提供了一种新的依据。The thermal expansion coefficient of plastic lens is big and all beam paths are integrated in one free form surface prism so the deformation of one or a few surface will affect the whole optical system. Though the optical parameters can satisfy the need of optical system, the thermal deformation may destroy the satisfactory situation under certain thermal load. The mechanism of thermal deformation of lenses is deducted and the differential equation of thermal mechanics displacement is got in this paper. A sample analysis is presented. The effect of present thermal load on the deformation of the surface of plastic free form surface prism is analyzed in the way of finite element and the result is presented. Thus a new precise evaluation of the plastic optical system property is obtained.

关 键 词：塑料透镜 热变形 光学模型 有限元分析 

分 类 号：TH703[机械工程—仪器科学与技术]