折/衍混合透视型头盔显示器光学系统设计  

Design of the optical system for a see-through refractive/diffractive hybrid helmet mounted display

作　　者：杨新军[1] 王肇圻[1] 孙强[2] 卢振武[2] 

机构地区：[1]南开大学现代光学研究所 [2]中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室,吉林长春130033

出　　处：《光电工程》2005年第1期9-12,8,共5页Opto-Electronic Engineering

基　　金：国家自然科学基金资助项目 (60277021)

摘　　要：为满足头盔显示器(HMD)对大视场、高像质和彩色显示的要求,提出了改进型 HMD 光学系统。该系统以彩色 LCD 为图像源实现彩色显示;以折/衍混合单透镜代替双胶合,利用其负色散和波面任意整形特性消除系统色差及改善波前像差。图像源发出的光束在分束器附近成中间像,可增大系统视场;出瞳在中继光学组元中间成像,可减小系统口径,增大出瞳直径;球面耦合器将分束器反射过来的光束准直后投射到人眼,能消除人眼反复观察不同焦距的视频图像和外界图像所造成的疲劳。该系统垂轴色差小于 42μm,视场扩大为 40°(水平)×30°(垂直),分辨力接近人眼的最小分辨能力;口径小于 46mm,重量比现有 HMD 光学系统下降 47%。In order to meet the demands of Helmet Mounted Display (HMD) with large field of view, high image quality and colorful display, a modified optical system for HMD is proposed. The system, with a miniature color LCD as the image source, adopts a hybrid refractive/diffractive singlet in place of the doublet. The chromatic aberration and wavefront aberration of the optical system can be eliminated with negative dispersion coefficient and power of arbitrary phase modulation of the binary element, respectively. The image source forms an intermediate image near the beam-splitter to enlarge the field of view; the exit pupil forms an intermediate image between the front and rear elements of the relay optics to reduce the diameter of the optical system and enlarges the diameter of the exit pupil. The spherical combiner projects the collimated beam from beam-splitter into human eyes, which eliminates eyestrain caused by repeatedly observing video images and external images with different focal lengths. The vertical axis chromatic aberration of the system is less than 42 μm in visible light band and its field of view enlarges to 40° (horizontal) × 30° (vertical). Its resolution has approached the minimal resolving capability of human eye. In addition, the aperture is less than 46 mm and weight is reduced by 47% than that of the existing perspective HMD.

关 键 词：头盔显示器 衍射光学元件 光学系统设计 

分 类 号：TH702[机械工程—仪器科学与技术]