实现近场均匀照明的双自由曲面大角度透镜设计

发布时间：2018-10-29 21:42

【摘要】：针对LED单自由曲面透镜近场大角度照明均匀性不足和出光效率低等问题,基于边缘光线理论和网格划分法,设计了内曲面为椭圆型,外曲面为自由曲面的LED双自由曲面大角度透镜.透镜内曲面对LED入射光线进行发散,外曲面对出射光线方向进行控制,实现大角度均匀照明,并减少全反射损失,提高出光效率.采用扩展光源文件对透镜模型进行光学仿真,并利用反馈优化法对外曲面进行优化,提高近场的照度均匀性.研究表明:在相同近场距离条件下,出光角度为143°、151.8°时,单自由曲面透镜照度均匀性为0.55和0.40,出光效率为92.0%和80%,而所设计的双自由曲面透镜照度均匀性为0.84和0.85,出光效率为98.8%和95.0%,照明效果明显改善.
[Abstract]:Aiming at the problems of low uniformity of near-field large-angle illumination and low light efficiency of LED single free-form lens, an elliptical interior surface is designed based on the theory of edge ray and the method of mesh division. Large angle lens of LED double free surface with outer surface as free surface. The inner curvature of the lens diverges from the LED incident light, and the outer curvature controls the direction of the emitted light to achieve uniform illumination at large angles, reduce the total reflection loss, and improve the light efficiency. The optical simulation of the lens model is carried out by using the extended light source file and the external surface is optimized by the feedback optimization method to improve the illumination uniformity of the near field. The results show that under the same near-field distance, the illumination uniformity of single free-form lens is 0.55 and 0.40, the light efficiency is 92.0% and 80%, when the angle of light is 143 掳and 151.8 掳, the illumination uniformity of single free-form lens is 0.55 and 0.40, respectively. The illumination uniformity of the designed double free curved lens is 0.84 and 0.85, the light efficiency is 98.8% and 95.0, and the illumination effect is improved obviously.
【作者单位】：华侨大学信息科学与工程学院光传输与变换福建省重点实验室;福建泉州世光照明科技有限公司;
【基金】：福建省科技计划重点项目(No.2013I0004) 光传输与变换福建省重点实验室开放课题(No.2014201) 南安市中小企业创新基金(No.201101) 南安市科技计划重点项目(No.G201212)资助
【分类号】：TH74

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