Multiple light emitting diodes with different secondary optics

Details Multiple light emitting diodes with different secondary optics Multiple light emitting diodes with different secondary optics

2005-10-25

2008-12-09

Alavi, Ali (Department: 2875)

Illumination

Plural light sources

With modifier

C362S242000, C362S235000

Reexamination Certificate

active

07461948

ABSTRACT:
A plurality of light emitting diode dies (LED) with associated secondary optics, which produce different light distribution patterns, are combined to produce an efficient light source having a desired illumination pattern. By way of example, a first LED may include a lens that produces a light distribution pattern with a maximum intensity at the center while a second LED may use a lens that produces a light distribution pattern with a maximum intensity that surrounds the maximum intensity of the pattern produced by the first LED. The light from the LEDs can then be combined to produce a desired illumination pattern. Additional LEDs and lenses, e.g., having different light distribution patterns may be used if desired. Moreover, a variable current driver may be used to vary the amount of current to the different LEDs, such that the combined illumination pattern may be varied as desired.

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