针对现有的LED照明系统体积大、结构复杂、工作距离短的缺点,提出一种轻量化、均匀性好、能够实现远距离照明的单颗LED投影系统的设计方法.从照明设计理论出发,结合非成像设计和成像设计方法,设计了由单颗大功率LED、聚光镜、孔径光阑和投影物镜组成的投影照明系统.聚光镜对LED出射的光线进行匀化并会聚于照明面位置,投影物镜将照明面处的光斑投影到指定距离的接收面上.系统采用全透射式结构,便于加工和装调;单颗大功率LED作为光源能够有效减小系统体积和质量.实验结果表明:系统能在3 m~3 km范围内形成均匀度大于90%的照明,成像质量良好,投影面畸变小于5%,能满足远距离均匀照明投影的要求.%In view of shortcomings of existing LED lighting system with large volume,complicated structure and short working distance,a new design method of single LED projection system with light weight,good uniformity and long distance illumination is proposed.Based on the theory of illumination design,combined with non-imaging design and imaging design method,a projection lighting system composed of single high power LED,condenser lens,aperture stop and projection objective is designed.Firstly,the condenser concentrates lights emitting from LED and converges them to lightening plane,and then objective lens project light spot at lightening plane onto receiving surface with specified distance.The system uses a full-transmission structure,easy to process and install.Single high-power LED as a light source can effectively reduce the system size and mass.Experimental results show that this system can form illumination with uniformity of more than 90% in the range of 3 m~3 km.The system ensure good image quality and distortion of projection plane being less than 5%,which can satisfy requirements of uniform illumination and projection over a long distance.
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