Abstract
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 language | English |
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Pages (from-to) | 10984-10995 |
Number of pages | 12 |
Journal | Optics Express |
Volume | 20 |
Issue number | 10 |
DOIs | |
Publication status | Published - 2012 May 7 |
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics