LED COLLIMATOR HAVING SPLINE SURFACES AND RELATED METHODS
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United States of America Patent
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Issued Date -
May 21, 2009
app pub date -
Nov 15, 2007
filing date -
Nov 15, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A TIR collimator for an LED light source includes a body portion having a reflective surface, wherein the reflective surface includes a plurality of segments. Respective segments of the reflective surface have corresponding cross-sectional profiles defined by different low-order polynomial functions, such that the overall cross-sectional profile of the reflective surface constitutes a spline, i.e., a piecewise polynomial function. The respective segments are configured to achieve substantial collimation of the output light. In one example, the cross-sectional profiles of adjacent segments of the reflective surface are defined by different low-order polynomials. Additionally, two or more adjacent segments may have respective cross-sectional profiles which together are defined by a Bezier curve, so as to provide smooth transitions between adjacent segments of the spline reflective surface.
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