紧凑型增强现实头盔显示器光学系统设计

Compact optical system design of head-mounted display for augmented reality

设计了一种用于增强现实的紧凑型头盔显示器光学系统,该系统视场角26.3°×19.7°,焦距32 mm,出瞳距离20 mm,出瞳直径8 mm。在光学系统中使用衍射面与高次非球面设计,实现了光学系统的轻量化,系统内、外两个光通道的光能量利用率分别为1/4和1/2,光学系统镜头直径小于45 mm,重量小于8 g,不仅在结构上满足使用者头戴要求,而且成像质量接近衍射极限,最大场曲和最大像散分别为45μm和46μm,畸变小于5%,最大垂轴色差值仅为6.9μm,满足增强现实"虚实结合"显示需求。

A hybrid diffractive-refractive compact optical system of head-mounted display for augmented reality was designed,and the system has field of view of 26. 3° × 19. 7°,eye relief of 20 mm,exit pupil of 8 mm and focal length of 32 mm. By introducing diffractive surface and high-order aspherical design,the lightweight system is realized. The utilization ratios of optical energy in inner channel and outer channel are 1 / 4 and 1 / 2 respectively. The diameter of this system is less than 45 mm and the weight is less than 8 g. This head-mounted display can satisfy the demands of user in structure,and imaging quality approaches diffraction limit,and the maximum field curvature and the maximum astigmatism are 45 μm,46 μm respectively; the distortion is less than 5%,and the maximum lateral chromatic aberration is only 6. 9 μm,which satisfies the need of ＂combining real with virtual＂for augmented reality.