LED-based lamps
First Claim
Patent Images
1. A lamp comprising:
- a dish-shaped reflector;
at least one LED operable to generate excitation light;
a light guide configured to extend along an axis of the reflector, wherein light generated by the at least one LED is coupled into a first end of the light guide and wherein light is emitted from the light guide at a light emitting surface that is in proximity to a second end of the light guide, wherein the light emitting surface tapers outwardly away from the first end of the light guide;
at least one phosphor material provided as a layer on at least a part of the light emitting surface of the light guide; and
a light reflective surface on one end of the light emitting surface, wherein the light reflective surface prevents light emission from the second end of the light guide, and is configured to reflect light towards the at least one phosphor material.
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Abstract
A lamp comprises: a dish-shaped (parabolic); an LED operable to generate excitation light; a light guide configured to extend along an axis of the reflector, wherein light generated by the at least one LED is coupled into a first end of the light guide and wherein light is emitted from the light guide at a light emitting surface that is in proximity to a second end of the light guide and at least one phosphor material provided as a layer on at least a part of the light emitting surface of the light guide. An LED light bulb is also disclosed.
170 Citations
16 Claims
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1. A lamp comprising:
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a dish-shaped reflector; at least one LED operable to generate excitation light; a light guide configured to extend along an axis of the reflector, wherein light generated by the at least one LED is coupled into a first end of the light guide and wherein light is emitted from the light guide at a light emitting surface that is in proximity to a second end of the light guide, wherein the light emitting surface tapers outwardly away from the first end of the light guide; at least one phosphor material provided as a layer on at least a part of the light emitting surface of the light guide; and a light reflective surface on one end of the light emitting surface, wherein the light reflective surface prevents light emission from the second end of the light guide, and is configured to reflect light towards the at least one phosphor material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification