塑料非球面透镜在头盔3D显示中的应用

Application of plastic aspherical elements in Head Mounted 3D display

研究了塑料非球面透镜用于3D头盔光学系统中的特性,给出了具体的设计实例,并同传统 Erfle目镜作了比较。设计结果表明,在保证有效焦距、出瞳直径、出瞳距离和视场角不变的情况下,Erfle目镜系统由原来的5片减少为3片,同时其材料的总厚度仅为24 mm,缩小为 Erfle目镜的1/3;质量仅为39 g,缩小为 Erfle目镜1/10;光学系统垂轴像差在0°视场最大值为20μm,60°视场为 62μm,均比 Er fle目镜有非常大的改善;场曲也有了较好的改善,从 0.95 降至 0.25。因此该目镜系统不但可以满足HMDs 式3D显示系统对视场、出瞳直径和出瞳距离的要求,而且在结构上更趋向轻、小,其像差特性亦可以满足目视系统的要求。

The properties of plastic aspherical elements applied in Head Mounted 3D display are studied and the optical design example is presented, in addition, the designed system is compared with the conventional Erfle eyepiece system. The results show that in the stationary conditions of effective focal length, exit pupil diameter and field of view, the Erfle eyepiece system only needs three elements instead of five elements, the total thickness of optical elements is 24 mm, which is the one-third of prototype, the weight is 39 g, which is the one-tenth of prototype. The maximums number of transverse aberration is 20 μm in a field of view of 0° and 62 μm in a field of view of 60°, the above parameters are all improved more than those of the conventional Erfle eyepiece system, and the field curvature has also good progress falling from 0.95 to 0.25. The designed optical structure has the advantages of simplicity and compactness, so it can meet the demands of eyepiece in aberration characteristic.