为适应近年来头盔显示器微型化和轻量化的发展需求,设计了一种紧凑型折反式头盔显示器光学系统.通过减小分束镜倾角使整个棱镜更薄；系统引入双胶合透镜和非球面,用以消除系统色差及其他像差；所有元件采用胶合方式实现一体化结构,更加紧凑,便于装调.设计的光学系统技术指标为视场角27.0°×20.4°,出瞳距离25 mm,出瞳直径12mm,后截距大于5mm,眼分辨率满足在40 lp/mm时的调制传递函数(MTF)值大于0.5,系统畸变小于0.5％.分析结果表明,该系统具有良好的成像质量,系统像差特性满足目视系统的成像要求,可广泛应用于虚拟现实的各个领域.%The Helmet-Mounted Displays (HMDs) are becoming compact and lightweight in recent years. To meet the requirement of it, a compact catadioptric optical system was designed. The prism was thinner than before by reducing the obliquity of beam splitter. Doublet and aspheric surface were introduced into the system to correct the chromatic aberration and other aberrations effectively. All the elements were agglutinated to make it compact and easy for assembly and adjustment. The designed technical specifications of the optical system are;FOV of 27°×20.4°, exit pupil distance of 25 mm, exit pupil diameter of 12 mm, back focal length more than 5 mm, Modulation Transfer Function ( MTF) higher than 0. 5 at the frequency of 40 lp/mm, and the distortion was less than 0. 5%. The results show that the optical system has a fine performance and can meet the aberration characteristics demands of eyepieces. The system can be widely used in various fields of virtual reality.
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