LED lamp producing sparkle

Details LED lamp producing sparkle LED lamp producing sparkle

2009-05-12

2011-10-11

Ward, John A (Department: 2885)

Illumination

Light source and modifier

Including translucent or transparent modifier

C362S311010, C362S311030

Reexamination Certificate

active

08033691

ABSTRACT:
A substantially hemispherical lens surrounding an LED die is described that creates a sparkle as an observer views the lens from different angles. The lens is formed of an interconnected array of 100-10,000 or more lenslets. Each lenslet focuses an image of the LED die at an output of the lenslet such that the LED die image area at the output is less than 1/9 the area of the LED die to create a substantially point source image of the LED die at an outer surface of the lens. When the LED die is energized, the shape of each lenslet causes point source images of the LED die to be perceived by an observer at various viewing angles, such that the emitted LED light appears to sparkle and speckle as the observer moves relative to the lens.

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