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US 6,598,998 B2Granted
Side emitting light emitting device
AssigneeLumileds Lighting U.S., LLC
InventorsRobert S. West, Gary D. Sasser, James W. Stewart
Life of this patent
Estimating the term…
Abstract
A lens mounted to a light emitting diode package internally redirects light within the lens so that a majority of light is emitted from the lens approximately perpendicular to a package axis of the light emitting diode package. In one embodiment, the light emitted by the light emitting diode package is refracted by a sawtooth portion of the lens and reflected by a total internal reflection portion of the lens.
Claims63
A light-emitting device comprising:
- a light-emitting semiconductor device;
- and
- a lens comprising:
- a bottom surface;
- a reflecting surface;
- and
- a refracting surface obliquely angled with respect to a central axis of the lens;
- wherein light emitted by the semiconductor device, entering the lens through the bottom surface, and directly incident on the reflecting surface is reflected from the reflecting surface to the refracting surface and refracted by the refracting surface to exit the lens in a direction substantially perpendicular to the central axis of the lens.
5 more elements
A method of emitting light from a light emitting diode, comprising:
- generating a light output from a light emitting diode package, said package containing a light emitting diode for emitting light;
- and
- redirecting light from the light emitting diode using a lens comprising a bottom surface, a reflecting surface, and a refracting surface obliquely angled with respect to a central axis of the lens, wherein redirecting light from the light emitting diode comprises:
- receiving light through the bottom surface;
- refracting light incident on the refracting surface such that the refracted light exits the lens in a direction substantially perpendicular to the central axis of the lens;
- and
- reflecting light incident on the reflecting surface such that the reflected light exits the lens in a direction substantially perpendicular to the central axis of the lens.
4 more elements
Dependencies are inferred from the claim text.