LED交通信号灯光学设计

Optical design for an LED traffic signal light

设计了一款在规定角度范围内光强均匀分布且直观无明显的颗粒感的LED交通信号灯。将高亮度LED的出射光用菲涅耳透镜进行准直,利用斯涅尔定律,设计了枕型透镜来实现指定方向上的照明,并将之排成阵列,以获得一定角度范围内的光强均匀分布。利用ZEMAX光学设计软件对设计方案进行了模拟,分别给出了水平和竖直两个方向上角度光强均匀分布的结果。通过仿真人眼对信号灯的成像,呈现人眼的观察效果,结果表明该设计满足设计要求。

An LED traffic signal light without obvious granular sensation was designed, which had a uniform distribution of luminous intensity in a certain angle range. The emergent rays of the highlighted LED were collimated by a Fresnel lens. A pillow lens was designed and arrayed to achieve the specified direction lighting and a uniform distribution of luminous intensity in a certain angle range by using the Snell＇s Law. The design was simulated by using the optical design software ZEMAX and the results that the luminous intensity was distributed uniformly were given in both horizontal and vertical angles. The design was proved to meet the design requirement by simulating the imaging of signal light in human eyes and showing the observing effect of eyes. The applications of the design in practical engineering were analyzed in the article.