Energy star compliant LED lamp
View Patent ↗The present disclosure provides an illumination device. The illumination device includes a cap structure. The cap structure is partially coated with a reflective material operable to reflect light. The illumination device includes one or more lighting-emitting devices disposed within the cap structure. The light-emitting devices may be light-emitting diode (LED) chips. The illumination device also includes a thermal dissipation structure. The thermal dissipation structure is coupled to the cap structure in a first direction. The thermal dissipation structure and the cap structure have a coupling interface. The coupling interface extends in a second direction substantially perpendicular to the first direction. The thermal dissipation structure has a portion that intersects the coupling interface at an angle. The angle is in a range from about 60 degrees to about 90 degrees according to some embodiments.
1. An apparatus, comprising:
a cap that houses a photonic device therein, the cap including:
a first segment coated with a reflective material;
a second segment coupled to the first segment, the second segment being free of a reflective coating; and
a third segment that is transparent, and wherein the second segment is disposed between the first segment and the third segment;
wherein the first segment is disposed farther away from the photonic device than the second segment.
2. The apparatus of claim 1 , wherein the second segment has a textured surface.
3. The apparatus of claim 2 , wherein the textured surface includes one of: a roughened surface and a surface containing a plurality of patterns.
4. The apparatus of claim 2 , wherein the textured surface has a gradient textured profile such that a portion of the surface closer to the first segment of the cap is more textured than a portion of the surface farther away from the first segment of the cap.
5. The apparatus of claim 1 , wherein the first segment is wider than the second segment.
6. The apparatus of claim 1 , wherein:
the first segment of the cap includes a side surface and an end surface;
the second segment of the cap is coupled to the side surface of the first segment; and
the photonic device is operable to project radiation toward the end surface.
7. The apparatus of claim 6 , wherein:
the side portion has a sloped surface; and
the end portion has one of: a curved surface and a substantially flat surface.
8. The apparatus of claim 1 , wherein the apparatus further includes a heat sink, and wherein the second segment includes:
a first opening coupled to the first segment of the cap; and
a second opening coupled to the heat sink.
9. The apparatus of claim 8 , wherein:
a portion of the heat sink coupled to the second opening forms an acute angle with respect to a plane on which the second opening resides; and
the acute angle is at about or greater than 60 degrees.
10. The apparatus of claim 1 , wherein the first segment of the cap includes a plurality of coating regions that have different coating concentration levels of the reflective material.
11. A lighting device, comprising:
a cap structure partially coated with a reflective material;
one or more lighting-emitting devices disposed within the cap structure; and
a thermal dissipation structure coupled to the cap structure in a first direction;
wherein:
an interface between the thermal dissipation structure and the cap structure extends in a second direction substantially perpendicular to the first direction; and
a portion of the thermal dissipation structure intersects the interface at an angle that is in a range from about 60 degrees to about 90 degrees.
12. The lighting device of claim 11 , wherein the thermal dissipation structure protrudes in the second direction.
13. The lighting device of claim 11 , wherein the cap structure includes:
a first substructure coated with the reflective material; and
a second substructure that is non-reflective and at least partially textured.
14. The lighting device of claim 13 , wherein the second substructure is at a widest point at an interface between the first substructure and the second substructure.
15. The lighting device of claim 13 , wherein the first substructure includes an end surface that is substantially flat or curved.
16. The lighting device of claim 13 , wherein:
the second substructure includes a non-textured surface that is transparent and a textured surface that is less transparent than the non-textured surface;
the textured surface has a non-uniform texturing density distribution; and
the textured surface is located closer to the cap structure than the non-textured surface.
17. The lighting device of claim 11 , wherein the cap structure includes multiple coating segments, and wherein each coating segment has a respective concentration level of the reflective material that is different from the concentration level of at least one other coating segment.
18. A lamp, comprising:
a cap that includes: an end portion that is reflective and a side portion that is non-reflective, wherein at least a circumferential area of the side portion is textured, and wherein the end portion is wider than the side portion;
an lighting-emitting package located within the cap; and
an outwardly-protruding heat sink coupled to the cap, wherein an acute angle of greater than 60 degrees is formed between a portion of the heat sink coupled to the cap and a plane formed from a rim of the cap.
19. The lamp of claim 18 , wherein the side portion of the cap includes an additional circumferential area that is non-textured and transparent.
20. The lamp of claim 18 , wherein the textured segment of the side portion has a texturing density that is a function of a distance to the end portion of the cap.
21. The lamp of claim 18 , wherein:
the side portion of the cap has a tapered profile; and
the end portion is at least as wide as the side portion.
22. The lamp of claim 18 , wherein the end portion includes a plurality of areas that each have a different degree of reflectivity.