Freeform lens design for LED collimating illumination

Jin Jia Chen, Te Yuan Wang, Kuang Lung Huang, Te Shu Liu, Ming Da Tsai, Chin Tang Lin

Research output: Contribution to journalArticlepeer-review

100 Citations (Scopus)


We present a simple freeform lens design method for an application to LED collimating illumination. The method is derived from a basic geometric-optics analysis and construction approach. By using this method, a highly collimating lens with LED chip size of 1.0 mm×1.0 mm and optical simulation efficiency of 86.5% under a view angle of ± 5 deg is constructed. To verify the practical performance of the lens, a prototype of the collimator lens is also made, and an optical efficiency of 90.3% with a beam angle of 4.75 deg is measured.

Original languageEnglish
Pages (from-to)10984-10995
Number of pages12
JournalOptics Express
Issue number10
Publication statusPublished - 2012 May 7

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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