LED based pedestal-type lighting structure

• US 8,562,161 B2
• Filed: 08/02/2010
• Issued: 10/22/2013
• Est. Priority Date: 03/03/2010
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated), Ideal Industries, LLC (Ideal Industries Incorporated)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Tong, Tao, Letoquin, Ronan, Keller, Bernd, Lowes, Theodore, Tarsa, Eric, Youmans, Mark
• Primary Examiner(s): Green, Tracie Y
• Application Number:
  US12/848,825
• Publication Number:
  US 20110215696A1
• Time in Patent Office: 1,177 Days
• Field of Search: 362/235, 362/294, 362/297, 362/243, 313/46, 313/498
• US Class Current: 362/84
• CPC Class Codes: F21K 9/00 Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21K 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: F21V 29/773 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21V 3/00 Globes; Bowls; Cover glasses with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506
• CPC Class Codes: F21V 3/04 characterised by materials, surface treatments or coatings
• CPC Class Codes: F21Y 2107/00 Light sources with three-dimensionally disposed light-generating elements
• CPC Class Codes: F21Y 2107/40 on the sides of polyhedrons, e.g. cubes or pyramids
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 2224/32245 the item being metallic
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/181 Encapsulation

Abstract

LED based lamps and bulbs are disclosed that comprise a pedestal having a plurality of LEDs, wherein the pedestal at least partially comprises a thermally conductive material. A heat sink structure is included with the pedestal thermally coupled to the heat sink structure. A remote phosphor is arranged in relation to the LEDs so that at least some light from the LEDs passes through the remote phosphor and is converted to a different wavelength of light. Some lamp or bulb embodiments can emit a white light combination of light from the LEDs and the remote phosphor. These can include LEDs emitting blue light with the remote phosphor having a material that absorbs blue light and emits yellow or green light. A diffuser can be included to diffuse the emitting light into the desired pattern, such as omnidirectional.

Claims

1. A lamp, comprising:

a pedestal;

a solid state light source on said pedestal;

a shaped phosphor arranged remote to said solid state light source so that at least some light from said solid state light source passes through said remote phosphor and is converted to a different wavelength of light; and

a diffuser to diffuse light emitting from said lamp in an omnidirectional emission pattern;

wherein said solid state light source is arranged with respect to said remote phosphor so that light emitted in different directions from said light source travel substantially the same optical path length through said remote phosphor.

2. The lamp of claim 1, wherein said diffuser diffuses light from said solid state light source and light from said shaped remote solid state and light from said phosphor.

3. The lamp of claim 1, wherein said diffuser comprises a diffuser dome.

4. The lamp of claim 1, wherein said diffuser is integral to said shaped remote phosphor.

5. The lamp of claim 1, further comprising a heat sink structure wherein heat from said solid state light source passes through said pedestal and into said heat sink structure.

6. The lamp of claim 5, wherein said remote phosphor is also mounted to said heat sink structure.

7. The lamp of claim 5, wherein said shaped remote phosphor comprises a thermally conductive material wherein conversion heating is conducted to said heat sink structure.

8. The lamp of claim 1, wherein said pedestal is elongated and said solid state light source is mounted on the upper portion of said pedestal.

9. The lamp of claim 1, wherein said pedestal at least partially comprises a thermally conductive material.

10. The lamp of claim 1, wherein said pedestal comprises multiple surfaces and said solid state light source comprises multiple emitters each of which is mounted to one of said surfaces.

11. The lamp of claim 9, wherein said pedestal has a top surface and multiple side surfaces having an angle greater than 90 degrees to said top surface, at least some of these side surfaces having one of said multiple emitters.

12. The lamp of claim 9, wherein said pedestal has a top surface and multiple side surfaces having an angle greater than approximately 105 degrees to said top surface.

13. The lamp of claim 1, having an omnidirectional emission pattern with intensity variation of approximately +20 percent or less.

14. The lamp of claim 1, having an omnidirectional emission pattern with intensity variation of approximately +15 percent or less.

15. The lamp of claim 1, wherein said light source comprises blue emitters and said remote phosphor comprises a phosphor that absorbs blue light and re-emits a different wavelength of light, said lamp emitting a white light combination of blue LED light and conversion material light.