针对大视场近眼显示系统体积较大,像差校正困难的问题,文中提出了一种基于非对称视场的自由曲面近眼显示光学系统.利用正负视场非对称设置和折/反混合结构,在大叠加视场条件下,将合光镜口径减小了1/3.为了提高成像质量,引入自由曲面对离轴像差进行仿真校正.研究结果表明:近眼显示光学系统水平视场为+50°～-12°,垂直视场为30°,出瞳直径为6.3mm,焦距为-21 mm,工作波长为0.38～0.76μm,系统在空间频率50 lp/mm处,全视场传递函数值高于0.37,系统畸变在5％以内.%The research is aimed to solve the problem that the Near-eye display optical system is large in size and poor in aberration correction in a large field of view.A free surface near vision optical system based on an asymmetric field of view is proposed.By using a positive and negative field of view asymmetric setting and folding / anti-mixing structure,in a large stack of field,the beam diameter is reduced by 1/3.In order to improve the image quality,the free surface is introduced into the system to simulate the off-axis aberration.The horizontal field of view of the optical system ranges from +50°to -12°,the vertical field of view is 30°,the pupil diameter is 6.3 mm,the focal length is-21 mm,and the working wavelength is 0.38～0.76 um.The full-field transfer function value is higher than 0.37 at the spatial frequency 50lp / mm.The system distortion is less than 5％.
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