Light guide for low profile luminaire

• US 9,851,490 B2
• Filed: 01/30/2017
• Issued: 12/26/2017
• Est. Priority Date: 10/05/2009
• Status: Expired due to Fees

• Current Assignee: Lighting Science Group Corporation (Pegasus Capital Advisors, L.P.)
• Original Assignee: Lighting Science Group Corporation (Pegasus Capital Advisors, L.P.)
• Inventors: Boomgaarden, Mark Penley, Romeu, Ricardo, Kelley, Ryan, Holland, Eric
• Primary Examiner(s): Breval, Elmito
• Application Number:
  US15/419,667
• Publication Number:
  US 20170139108A1
• Time in Patent Office: 330 Days
• CPC Class Codes: F21K 9/20 Light sources comprising attachment means
• CPC Class Codes: F21K 9/23 Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
• CPC Class Codes: F21K 9/61 using light guides
• CPC Class Codes: F21K 9/68 Details of reflectors forming part of the light source
• CPC Class Codes: F21S 8/026 intended to be recessed in a ceiling or like overhead structure, e.g. suspended ceiling
• CPC Class Codes: F21V 21/20 operated by weights
• CPC Class Codes: F21V 2200/20 of light guides of a generally planar shape
• CPC Class Codes: F21V 23/02 the elements being transformers, impedances or power supply units, e.g. a transformer with a rectifier
• CPC Class Codes: F21V 23/0471 the sensor detecting the proximity, the presence or the movement of an object or a person
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21V 29/85 characterised by the material liquid coolants F21V29/56
• CPC Class Codes: F21Y 2101/00 Point-like light sources
• CPC Class Codes: F21Y 2103/33 annular
• CPC Class Codes: F21Y 2105/00 Planar light sources
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02B 6/00 Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
• CPC Class Codes: G02B 6/0031 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0035 provided on the surface of the light guide or in the bulk of it
• CPC Class Codes: G02B 6/0041 : provided in the bulk of the light guide
• CPC Class Codes: G02B 6/0065 : Manufacturing aspects; Material aspects
• CPC Class Codes: G02B 6/0068 : Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02B 6/0073 : Light emitting diode [LED]
• CPC Class Codes: G02B 6/0085 : Means for removing heat created by the light source from the package heat extraction or cooling elements for semiconductor light sources in general H01L33/64

Abstract

A luminaire comprising a heat sink, a light source and a light guide. The light source is carried by the heat sink and configured to emit a source light. The light source includes a heat spreader having an inner surface and an outer surface, and a plurality of light-emitting diodes (LEDs) carried by a circuit board and disposed generally along an outer peripheral perimeter portion of the inner surface of the heat spreader, and positioned in thermal communication with the heat spreader. The light guide includes a lens with a plurality of optical elements disposed within the lens.

Claims

1. A luminaire comprising:

a heat sink;

a light source carried by the heat sink and configured to emit a source light, the light source comprising

a heat spreader having an inner surface and an outer surface, and

a plurality of light-emitting diodes (LEDs) carried by a circuit board and disposed generally along an outer peripheral perimeter portion of the inner surface of the heat spreader, and positioned in thermal communication with the heat spreader;

a light guide comprising;

a propagation region comprising

a lens including solid optical elements comprising light scattering particles made from at least one of glass, ceramic, rubber, silica, inorganic material, and phosphor material, and non-solid optical elements comprising liquid and gas, and

wherein the lens comprises a plurality of micro-lenses; and

wherein the light guide is configured to scatter and concentrate light in multiple directions.

2. The luminaire according to claim 1 wherein the micro-lenses are one of circular, oval, rectangular, square, and polygonal in shape.

3. The luminaire according to claim 1 wherein a combination of the light source and the heat sink is so dimensioned as to cover an opening defined by a nominally sized four-inch can light fixture, and to cover an opening defined by a nominally sized four-inch electrical junction box.

4. The luminaire according to claim 1 wherein a combination of the light source and the heat sink is so dimensioned as to cover an opening defined by a nominally sized four-inch can light fixture, and to cover an opening defined by a nominally sized four-inch electrical junction box.