头盔显示器(HMD)作为一种头戴目视设备, 具有小型化、轻量化的特点, 同时为了获得良好的佩戴体验, 要求合理的出瞳距、出瞳直径以及视场。为了同时满足头盔显示器的上述要求, 采用紧凑的双反射镜结构来满足头盔显示器对体积和重量的要求, 应用自由曲面增加设计自由度来校正大视场和非旋转对称结构引入的像差, 并阐述了自由曲面补偿非旋转对称光学系统像差的基本原理以及该光学系统的设计方法与过程。该光学系统无色差, 视场为50°×25°, 出瞳大小为8 mm, 出瞳距大于27 mm。在奈奎斯特频率处全视场的调制传递函数大于0.4, 可应用于新一代头盔显示技术。

Head mounted display (HMD) as a kind of visual systems requires a large field of view (FOV), a large exit pupil distance, a small volume, and light in weight. In order to meet these requirements, a compact two-mirror structure and free form surfaces were introduced to the system. Two-mirror structure was benefit to minmize the weight and volume of the system. Free form surfaces was used to correcte the aberrations introduced by wide FOV and non-rotationally symmetry of the HMD. The abberation compensate theory and design method were also described in detail. An achromatic HMD with 50°×25° FOV, 8 mm pupil, 27 mm eye clearance was designed. The modulation transfer function (MTF) value was more than 0.4 within the entire FOV. The system could be applied to the next generation HMD technology.