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Lens design of LED searchlight of high brightness and distant spot |
JOSA A, Vol. 28, Issue 5, pp. 815-820 (2011)
http://dx.doi.org/10.1364/JOSAA.28.000815
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Abstract
The study related in this paper is the design of a ship-mounted LED of high brightness and distant spot. The freeform lens design obeying the edge ray principle and Snell’s law is presented first. Then, to fit the illumination requirement of the searchlight, we designed a freeform lens to collimate all the light rays coming from the LED. However, theoretical analysis proves that there is a critical angle for incident rays beyond which the rays cannot be collimated, and 55% is the light-efficiency limit for polymethyl methacrylate freeform lens. We then designed a combination of a freeform lens–coupled parabolic reflector that improved light efficiency to 70%. In this paper, the design of the freeform lens–coupled parabolic reflector is given in detail. In addition, tolerance analysis and the effect of manufacturing defect are presented.
© 2011 Optical Society of America
OCIS Codes
(220.3620) Optical design and fabrication : Lens system design
(230.3670) Optical devices : Light-emitting diodes
(220.2945) Optical design and fabrication : Illumination design
(080.4298) Geometric optics : Nonimaging optics
ToC Category:
Optical Devices
History
Original Manuscript: February 16, 2011
Manuscript Accepted: February 22, 2011
Published: April 20, 2011
Citation
Shuang Zhao, Kai Wang, Fei Chen, Dan Wu, and Sheng Liu, "Lens design of LED searchlight of high brightness and distant spot," J. Opt. Soc. Am. A 28, 815-820 (2011)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-28-5-815
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