一般LED光源均匀配光的自由曲面菲涅耳透镜

Fresnel Lens of Freeform Surface for Realizing Uniform Light Distribution on General LED Light Sources

提出了一种菲涅耳透镜的普适设计方法,可适用于广义朗伯分布的LED光源,能够同时实现聚光和均匀配光。该方案能够克服传统透镜均匀配光聚光效果不佳的问题,得到的菲涅耳透镜具有聚光比率高、厚度薄、数值孔径较大、光效利用率较高等优点,有助于充分改善LED光源的照明质量,尤其适用于大发光角度的LED光源。在理论设计的基础上,利用专业软件对透镜进行3D建模和仿真,结果进一步验证了该方案的有效性和可靠性。

A general design method of Fresnel lens is proposed, which can be applied to LED light sources of general Lambert distribution, and the focusing and uniform light illuminance are realized simultaneously. The proposed method overcomes the imperfect focusing and uniform light illuminance optical effects of traditional lens. And the obtained Fresnel lens has the advantages of high focusing rate, thin thickness, large numerical aperture, and high efficiency of light extraction, which is beneficial to improving the lighting quality of LED sources. The lens is especially suitable for LED sources of large emission angle. Based on the theoretical design, 3D modeling of the lens and simulation are carried out by professional software, and the results verifies the validity and reliability of the proposed method.