[특허]LED lamp with omnidirectional light distribution

[미국특허] LED lamp with omnidirectional light distribution 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F21V-001/00 F21V-029/00 F21K-099/00 F21V-017/16 F21V-029/77 F21V-003/02 F21Y-101/02 F21Y-103/02
출원번호	US-0793325 (2013-03-11)
등록번호	US-9303857 (2016-04-05)
발명자 / 주소	Desilva, Nicholas Nava, Dante Higley, Robert Youmans, Mark
출원인 / 주소	Cree, Inc.
대리인 / 주소	Williamson, Dennis J.
인용정보	피인용 횟수 : 1 인용 특허 : 78

초록 ▼

An LED based lamp has an optically transmissive enclosure connected to a base. The base may include a heat sink. A substrate is positioned in the enclosure and supports a plurality of LEDs where the periphery of the substrate has alternating recessed portions and protruding portions that define a plurality of laterally extending projections. One LED is located on each of the projections to increase the amount of down light generated by the lamp.

대표청구항 ▼

1. A lamp comprising: an optically transmissive enclosure;a base connected to the enclosure defining a longitudinal axis of the lamp extending from the base to a distal end of the enclosure;a substrate comprising a surface disposed substantially perpendicularly to the longitudinal axis supporting a plurality of LEDs in the enclosure positioned to direct light primarily away from base wherein the periphery of the substrate comprises alternating first recessed portions and first protruding portions that define a plurality of laterally extending projections where one of the plurality of LEDs is supported on one of the plurality of projections;a heat sink comprising second protruding portions and second recessed portions that correspond to the first protruding portions and first recessed portions on the periphery of the substrate such that the second protruding portions are vertically aligned with the first protruding portions and the second recessed portions are vertically aligned with the first recessed portions such that a plurality of passages are formed along the longitudinal axis of the heat sink that extend from adjacent the LEDs toward the base, the heat sink having a first portion located inside of the enclosure and a second portion located outside of the enclosure where the plurality of passages extend from inside the enclosure to outside the enclosure. 2. The lamp of claim 1 wherein the base comprises an Edison connector. 3. The lamp of claim 1 wherein the substrate is thermally coupled to the heat sink such that heat from the LEDs is transferred to the exterior of the lamp. 4. The lamp of claim 1 wherein the plurality of LEDs are disposed about the periphery of the enclosure adjacent to the base. 5. The lamp of claim 1 wherein each one of the plurality of projections supports only a single one of the plurality of LEDs. 6. The lamp of claim 1 wherein the plurality of LEDs are mounted at the distal ends of the plurality of projections such that a portion of the light generated by the plurality of LEDs is projected as downlight toward the base of the lamp, the light projected as downlight being projected around a major portion of each of the plurality of LEDs. 7. The lamp of claim 1 wherein the projections are dimensioned such that the one of the plurality of LEDs is closely disposed to the edge of the one of the plurality of projections so that at least two sides of the one of the plurality of LEDs is closely disposed to two corresponding edges of the one of the plurality of projections and the profile of the first protruding portions is substantially the same as the profile of the second protruding portions. 8. The lamp of claim 1 wherein the enclosure extends over the substrate and the plurality of LEDs and is connected to the heat sink such that the second portion of the heat sink is disposed external to the enclosure between the enclosure and the base. 9. The lamp of claim 8 wherein an open neck of the enclosure closely conforms to the second protruding portions and the second recessed portions of the heat sink. 10. The lamp of claim 1 wherein the enclosure is provided with a plurality of tabs that extend into mating apertures on the heat sink. 11. The lamp of claim 1 wherein selected ones of the plurality of LEDs are mounted on the substrate such that the selected ones of the plurality of LEDs are disposed at an angle other than 90 degrees relative to a longitudinal axis of the lamp to direct more light as downlight. 12. The lamp of claim 11 wherein a mounting surface on the substrate for mounting the selected ones of the plurality of LEDs are disposed at an angle other than 90 degrees relative to the longitudinal axis of the lamp. 13. The lamp of claim 11 wherein the selected ones of the plurality of LEDs are mounted using a bendable substrate such that the projections are bent at an angle other than 90 degrees relative to the longitudinal axis to position the selected ones of the plurality of LEDs at the angle. 14. A lamp comprising: an optically transmissive enclosure;a base connected to the enclosure, the base and the enclosure defining a longitudinal axis of the lamp;a substrate supporting a plurality of LEDs substantially perpendicular to the longitudinal axis in the enclosure wherein the periphery of the substrate comprises a plurality of laterally extending projections where one of the plurality of LEDs is supported on one of the plurality of projections such that a side of each of the plurality of projections is closely adjacent each of the plurality of LEDs such that each of the LEDs projects light over at least 180 degrees about the longitudinal axis of the lamp toward the base;a heat sink disposed partially inside of the enclosure and partially outside of the enclosure comprising a plurality of protruding portions and a plurality of recessed portions; anda plurality of light passages formed by the plurality of projections on the substrate and the plurality of protruding portions and the plurality of recessed portions on the heat sink, the passages extending from inside of the enclosure to outside of the enclosure along the longitudinal axis. 15. The lamp of claim 14 wherein a portion of the heat sink extends through an aperture in the enclosure. 16. A lamp comprising: an optically transmissive enclosure;a base connected to the enclosure defining a longitudinal axis of the lamp extending from the base to a distal end of the enclosure;a planar substrate disposed substantially perpendicularly to the longitudinal axis supporting a plurality of LEDs in the enclosure positioned to direct light primarily away from base wherein the periphery of the substrate comprises alternating first recessed portions and first protruding portions that define a plurality of laterally extending projections where one of the plurality of LEDs is supported on one of the plurality of projections such that a portion of the light from the LEDs is projected past the substrate as downlight;a heat sink disposed partially inside of the enclosure and partially outside of the enclosure comprising second protruding portions and second recessed portions that correspond to the first protruding portions and first recessed portions on the periphery of the substrate such that the second protruding portions are vertically aligned with the first protruding portions and the second recessed portions are vertically aligned with the first recessed portions to form a plurality of light passages, the plurality of passages extending from inside of the enclosure to outside of the enclosure along the longitudinal axis. 17. A lamp comprising: an optically transmissive enclosure;a base connected to the enclosure defining a longitudinal axis of the lamp extending from the base to a distal end of the enclosure;a substrate comprising a surface disposed substantially perpendicularly to the longitudinal axis supporting a plurality of LEDs in the enclosure positioned to direct light primarily away from base wherein the periphery of the substrate comprises alternating first recessed portions and first protruding portions that define a plurality of laterally extending projections where one of the plurality of LEDs is supported on one of the plurality of projections;a heat sink comprising second protruding portions and second recessed portions that correspond to the first protruding portions and first recessed portions on the periphery of the substrate such that the second protruding portions are vertically aligned with the first protruding portions and the second recessed portions are vertically aligned with the first recessed portions such that a plurality of passages are formed along the longitudinal axis of the heat sink that extend from adjacent the LEDs toward the base wherein an open neck of the enclosure closely conforms to the second protruding portions and the second recessed portions of the heat sink and the enclosure extends over the substrate and the plurality of LEDs and is connected to the heat sink such that a portion of the heat sink is disposed external to the enclosure between the enclosure and the base. 18. A lamp comprising: an optically transmissive enclosure;a base connected to the enclosure defining a longitudinal axis of the lamp extending from the base to a distal end of the enclosure;a substrate comprising a surface disposed substantially perpendicularly to the longitudinal axis supporting a plurality of LEDs in the enclosure positioned to direct light primarily away from base wherein the periphery of the substrate comprises alternating first recessed portions and first protruding portions that define a plurality of laterally extending projections where one of the plurality of LEDs is supported on one of the plurality of projections;a heat sink comprising second protruding portions and second recessed portions that correspond to the first protruding portions and first recessed portions on the periphery of the substrate such that the second protruding portions are vertically aligned with the first protruding portions and the second recessed portions are vertically aligned with the first recessed portions such that a plurality of passages are formed along the longitudinal axis of the heat sink that extend from adjacent the LEDs toward the base wherein the protruding portions of the heat sink extend through the enclosure at a point spaced from an open neck of the enclosure.

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[미국특허] LED lamp with omnidirectional light distribution 원문보기

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