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US 6,607,286 B2Granted
Lens and lens cap with sawtooth portion for light emitting diode
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.
Claims54
A lens cap attachable to a light source, comprising:
- a body comprising
- a central axis running along a length of said body;
- a first surface for coupling to a light source;
- a sawtooth lens portion whereby the sawtooth lens portion refracts light emitted from said light source such that a majority of light emitted from the sawtooth lens portion is generally perpendicular to said central axis of the body;
- a funnel-shaped lens portion connected to the sawtooth lens portion whereby the funnel-shaped lens portion reflects light emitted from the light source such that a majority of light emitted from the funnel-shaped lens portion is generally perpendicular to the central axis of the body;
- and
- an attachment means for coupling the lens cap to the light source whereby said attachment means is coupled to the sawtooth lens portion.
4 more elements
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 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.
2 more elements
A lens, comprising:
- a body comprising
- a central axis running along a length of the body;
- a first surface for coupling to a light source;
- a sawtooth lens portion whereby the sawtooth portion refracts light emitted from the light source such that a majority of light emitted from the sawtooth lens portion is generally perpendicular to the central axis of the body;
- a funnel-shaped lens portion connected to the sawtooth lens portion whereby the funnel-shaped lens portion reflects light emitted from the light source such that a majority of light emitted from the funnel-shaped lens portion is generally perpendicular to the central axis of the body;
- and
- wherein the lens has an index of refraction in the range of 1.45 to 1.6.
4 more elements
A lens, comprising:
- a first surface adapted for coupling to a light source;
- a sawtooth portion which refracts light coupled into the lens through the first surface, in a direction perpendicular to a central axis of the lens;
- and
- a funnel-shaped portion which reflects light coupled into the lens through the first surface in a direction perpendicular to the central axis;
- wherein the sawtooth portion and the funnel-shaped portion are formed in a single piece of material.
2 more elements
A lens cap attachable to a light source, comprising:
- a first surface adapted for optically coupling to a light source;
- a sawtooth portion which refracts light coupled into the lens cap through the first surface, in a direction perpendicular to a central axis of the lens cap;
- a funnel-shaped portion which reflects light coupled into the lens through the first surface in a direction perpendicular to the central axis;
- and
- means for mechanically coupling the lens cap to the light source, whereby the means is coupled to the sawtooth portion.
2 more elements
Dependencies are inferred from the claim text.