A Fresnel freeform surface collimating lens for LEDs

作者：Zhu, L.; Ge, A.^*; Ge, Z.; Hao, R.; Chen, J.; Tao, X.

来源：Lighting Research and Technology, 2018, 50(6): 952-960.

DOI：10.1177/1477153517712780

• ILLUMINATION

This paper proposes a freeform surface lens design based on the Fresnel model to achieve a compact structure and good collimation. A simulation indicates the lens enjoys an efficiency as high as 88.43% within a half view angle of 2 degrees for 1x1mm(2) size LED. This paper makes a comparison of three types of lens, among which the Fresnel freeform lens achieves the best performance when the LED size is smaller than 2.5x2.5mm(2). The influence of the LED size and the manufacturing tolerances are discussed.

• 出版日期2018-10
• 单位复旦大学