Solid state lamp with thermal spreading elements and light directing optics

• US 10,359,151 B2
• Filed: 02/16/2011
• Issued: 07/23/2019
• Est. Priority Date: 03/03/2010
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Inventors: Tarsa, Eric, Letoquin, Ronan, Tong, Tao, Keller, Bernd
• Primary Examiner(s): Gramling, Sean P
• Application Number:
  US13/029,068
• Publication Number:
  US 20110215345A1
• Time in Patent Office: 3,079 Days
• Field of Search: 362235, 36224902, 36231101-31102, 362 84, 362650
• 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 9/60 Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
• CPC Class Codes: F21K 9/62 using mixing chambers, e.g. housings with reflective walls
• 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 29/00 Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems lighting fixtures combined with outlets for air-treatment systems F24F13/078
• CPC Class Codes: F21V 29/505 of reflectors
• 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 3/02 characterised by the shape
• CPC Class Codes: F21V 3/12 the coatings comprising photoluminescent substances
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 2224/48091 Arched
• 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

Abstract

Lamps and bulbs are disclosed generally comprising different combinations and arrangements of a light source, one or more wavelength conversion materials, regions or layers which are positioned separately or remotely with respect to the light source, and a separate diffusing layer. This arrangement allows for the fabrication of lamps and bulbs that are efficient, reliable and cost effective and can provide an essentially omni-directional emission pattern, even with a light source comprised of a co-planar arrangement of LEDs. The lamps according to the present invention can also comprise thermal management features that provide for efficient dissipation of heat from the LEDs, which in turn allows the LEDs to operate at lower temperatures. The lamps can also comprise optical elements to help change the emission pattern from the generally directional (e.g. Lambertian) pattern of the LEDs to a more omni-directional pattern.

Claims

1. A solid state lamp, comprising:

at least one light emitting diode (LED) on a mount surface;

an optical element comprising an inner diameter, an outer diameter, and a curved portion shaped to fit over and at least partially surround said at least one LED, such that light from said at least one LED interacts with said optical element, said optical element shaped to define a hollow central opening, said optical element changing the emission pattern of said LED to a broader emission pattern;

said outer diameter varying with distance away from said mount surface in a perpendicular direction to define a curved conical side emission surface, said inner diameter defining said hollow central opening in said optical element;

a fastener passing through said central opening and fastening said optical element to said mount surface; and

a phosphor carrier over said optical element, said phosphor carrier converting at least some of said LED light to a different wavelength.

2. The lamp of claim 1, wherein said optical element comprises a substantially transparent material, light from said at least one LED guided by said optical element into a broader emission pattern.

3. The lamp of claim 2, wherein light from said at least one LED is guided in said optical element by total internal reflection.

4. The lamp of claim 2, wherein light from said at least one LED is guided in said optical element by refraction.

5. The lamp of claim 2, wherein a portion of light from said at least one LED is guided by said optical element to emit at an angle of 70 degrees or more to said at least one LED.

6. The lamp of claim 2, wherein a portion of light from said at least one LED is guided by said optical element to emit at an angle of 80 degrees or more to said at least one LED.

7. The lamp of claim 2, wherein a portion of light from said at least one LED is guided by said optical element to emit at an angle of 90 degrees or more to said at least one LED.

8. The lamp of claim 2, wherein a portion of light from said at least one LED passes out of said optical element.

9. The lamp of claim 2, wherein said optical element has a three-dimensional shape.

10. The lamp of claim 1, further comprising a heat spreading substrate to spread heat from said LED prior to encountering heat resistant materials.