一种新颖的智能眼镜光学系统设计方法

提出采用Fresnel微结构的曲面波导微投影光学系统眼镜设计思想，理论分析了所提光学系统的成像原理，给出了光学设计方法，并运用该方法设计了一套样机，曲面波导板近眼表面(即前表面)曲率半径为140.0 mm，后表面曲率半径为143.5 mm，中心厚度为1.7 mm，材料选PMMA (即有机玻璃)，微型显示器选0.23″硅基OLED显示屏，分辨率640×480(象素)，出瞳直径选为8 mm，眼点距约为18 mm，视场角9.6°(H)×7.2°(V)，调制传递函数(MTF)在空间分辨率30 lp/mm时，中心视场MTF接近0.45，全视场大于0.2。从而验证了该方法的可行性。

Novel optical system design method for smart glasses

The design idea of the curved waveguide micro-projection optical system glasses using Fresnel microstructure was proposed.The imaging principle of the proposed optical system was theoretically analyzed, the optical design method was given, and a set of prototype was designed by using this method. The front surface radius of curved waveguide plate (that is, close eye surface) is 140.0 mm, the back surface radius is 143.5 mm, the center thickness is 1.7 mm, the material selected is PMMA(ie plexiglass), the micro-display chosen is 0.23″ silicon-based OLED display, the resolution is 640×480 (pixel), the diameter of the exit pupil is 8 mm, the eye point distance is about 18 mm, the field of view(FOV) angle is 9.6° (H)×7.2° (V), and the modulation transfer function (MTF), at the spatial resolution of 30 lp/mm, is close to 0.45 for the center field, greater than 0.2 for the whole field, which verifying the feasibility of the proposed method.