摘要
针对直下式发光二极管(LED)平板光源,在矩形阵列排布条件下,通过照度图的对称性分析,采用一种基于分段式配光曲线生成折射率为1.4935的配光透镜的方法,从而实现整体照度均匀。设置距高比为4.1,以方形阵列排布的直下式LED平板光源为例,通过能量分配设计方法完成配光透镜的设计,仿真结果表明,目标面上照度的均匀度高于0.85,光效达到0.9以上,并适用于扩展光源。利用对称性分析可得到上述直下式LED平板光源出光面所能达到的均匀度上限,这对LED平板光源的光学设计具有指导意义。
In a rectangular light emitting diode （LED） array, by symmetry analysis of illuminance, a segmented illuminance profile of a light unit is presented to build free-form lenses for direct panel lights＇ uniform illuminance. Each light unit is composed of an LED element and a rotationally symmetrical free-form lens, whose refraction index is 1.4935. A square array of LED direct panel light with a distance-height ratio of 4.1 is given as a goal, then the free- form lenses are built by energy distribution design methodology, and the optical simulation results show that the uniformity on the target screen is greater than 0.85, and the optical effect is higher than 0.9. This method can be applied to the extend light sources. The limit of illuminance uniformity of the direct LED panel lights mentioned above can be achieved by using the symmetrical analysis method which is useful for the optical design of LED panel lights.
出处
《激光与光电子学进展》
CSCD
北大核心
2015年第10期252-258,共7页
Laser & Optoelectronics Progress
基金
国家自然科学基金(C10912152
C10914292)
浙江省公益性技术应用研究计划项目(2014C31106)
关键词
光学设计
LED阵列
对称性
均匀度
照度
optical design
light emitting diode arrays
symmetry
uniformity
illumiaance
