New TIR lens applications for light-emitting diodes

William A. Parkyn; David G. Pelka

doi:10.1117/12.290217

3 October 1997 New TIR lens applications for light-emitting diodes

William A. Parkyn, David G. Pelka

Proceedings Volume 3139, Nonimaging Optics: Maximum Efficiency Light Transfer IV; (1997) https://doi.org/10.1117/12.290217
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

We present two new applications for light emitting diodes of the Total Internal Reflection (TIR) lens, a non-imaging optical device presented at previous SPIE conferences on nonimaging optics. The first is a flat circularly symmetric lens that efficiently forms a highly collimated beam from the light output of Hewlett-Packard's Super Flux LEDs. The second is a linear TIR lens with die-on-board LEDs of several wavelengths positioned along its focal line. HP's Super-Flux LED package has an output half angle of 55 degree(s). Only the TIR lens can accept such a wide range for beamforming, and do it with high efficiency. We have designed and prototyped 1' models with half-power half angles of only 1.5 degree(s), utilizing a hyperbolic central section in place of the usual Fresnel lens. There are numerous applications for arrays of these lenses, since they emit more lumens per electrical watt than filtered incandescent lamps with parabolic mirrors. Moreover, they are more compact than conventional lamps, and LED lifetimes are much longer. The TIR lens in its linear form has been applied successfully to fluorescent downlighting products with much narrower transverse illumination angles than previously available with trough mirrors. More recently, light emitting diodes (LEDs) have been placed on the focal line of a linear lens. In this paper, we describe the optical properties and biomedical applications of the linear TIR lens when the LEDs have several different emission wavelengths. This single device can uniformly illuminate an extended target with several wavelengths either simultaneously, sequentially, or in complex programmed combinations. It can replace the complex systems of dichroic mirrors used with conventional white-light sources.

Citation Download Citation

William A. Parkyn and David G. Pelka "New TIR lens applications for light-emitting diodes", Proc. SPIE 3139, Nonimaging Optics: Maximum Efficiency Light Transfer IV, (3 October 1997); https://doi.org/10.1117/12.290217

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