Optics for use with Light Emitting Diodes are described. Microstructured optics are available and customizable for a wide variety of applications. A few of these will be touched on. A methodology of designing these optics and the photometrics of the typical technology is overviewed.
With the increasing popularity of LED’s in lighting applications,
there is a need for engineered photometric control. Given exacting
output requirements, it is unusual for a given supplier’s LED to produce
the correct emission profile. This can be remedied with the use of
auxiliary optics. Available classes of optics include refractive
(continuous surface and microstructured), reflective (continuous and
facetted) and diffractive.
The
type of designs considered here are light energy directing designs or
“nonimaging optics”. Some nonimaging design background will be outlined
followed by mention of some specific LED commercial applications. Design methodologies for microstructured
refractive optics will then be explored and a photometric analysis of a
sample design will be presented. Finally a discussion on some salient
issues regarding LEDs and microstructured optics is offered.
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