Illumination – Light source and modifier – Including reflector
Reexamination Certificate
2010-02-25
2011-12-06
Alavi, Ali (Department: 2875)
Illumination
Light source and modifier
Including reflector
C362S308000, C362S311020, C362S311090, C362S326000, C359S738000
Reexamination Certificate
active
08070326
ABSTRACT:
A lens that angularly redistributes light from an LED is disclosed. The desired illuminance (power per area) pattern for an LED/lens combination has a relatively flat center, a knee, and a gradual tail. By overlapping adjacent combinations' tails, the resulting illuminance pattern may be generally uniform, with relatively loose tolerances on LED/lens placement and performance. The lens has a proximal face with a concave spherical indentation with its center at the light source. The lens's distal face has a “center thickness” (CT) on-axis, a peak thickness away from a longitudinal axis of about 1.0 to 1.2 times the CT, a radius at which the peak thickness occurs of about 0.5 to 1.0 times the CT, a radius at which the thickness returns to the CT of about 1.1 to 1.5 times the CT, and a radius (maximum lateral extent) of the lens of about 1.6 to 1.9 times the CT.
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Alavi Ali
Montana Shaun P.
Osram Sylvania Inc.
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