Semiconductor lamp

• US 8,803,412 B2
• Filed: 03/18/2011
• Issued: 08/12/2014
• Est. Priority Date: 03/18/2011
• Status: Active Grant

• Current Assignee: ABL IP Holding LLC (Acuity Brands, Inc.)
• Original Assignee: ABL IP Holding LLC (Acuity Brands, Inc.)
• Inventors: Sanders, Chad N., Phipps, J. Michael, Rains, Jack C. Jr., Ramer, David P.
• Primary Examiner(s): Mai, Anh
• Assistant Examiner(s): FEATHERLY, HANA SANEI
• Application Number:
  US13/051,662
• Publication Number:
  US 20110176291A1
• Time in Patent Office: 1,243 Days
• Field of Search: 313483-485
• US Class Current: 313/485
• 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 9/238 Arrangement or mounting of circuit elements integrated in the light source
• 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 23/006 the substrate being distinct from the light source holder
• CPC Class Codes: F21V 29/506 of globes, bowls or cover glasses
• CPC Class Codes: F21V 29/51 using condensation or evaporation of a fluid, e.g. heat pipes
• CPC Class Codes: F21V 29/777 the planes containing the fins or blades having directions perpendicular to the light emitting axis
• CPC Class Codes: F21V 3/061 the material being glass
• CPC Class Codes: F21V 3/062 the material being plastics
• CPC Class Codes: F21V 3/08 the material comprising photoluminescent substances
• CPC Class Codes: F21V 3/12 the coatings comprising photoluminescent substances
• CPC Class Codes: F21Y 2107/30 on the outer surface of cylindrical surfaces, e.g. rod-shaped supports having a circular or a polygonal cross section
• 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 33/507 the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body
• CPC Class Codes: H01L 33/508 having a non-uniform spatial arrangement or non-uniform concentration, e.g. patterned wavelength conversion layer, wavelength conversion layer with a concentration gradient of the wavelength conversion material
• CPC Class Codes: H05B 45/00 Circuit arrangements for operating light-emitting diodes [LED]
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 45/30 Driver circuits
• CPC Class Codes: H05B 45/357 specially adapted for retrofit LED light sources
• CPC Class Codes: H05B 45/3574 : Emulating the electrical or functional characteristics of incandescent lamps
• CPC Class Codes: Y02B 20/30 : Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

A lamp for general lighting applications utilizes solid state light emitters and provides light output that may approximate light emissions from of an incandescent lamp. An exemplary lamp includes a bulb and a pedestal extending into the bulb that supports the light emitters in orientations such that emissions from the emitters through the bulb approximate emissions from a filament of an incandescent lamp. An inner member around the emitters and the pedestal provides further light processing, e.g. diffusing and/or phosphor luminescence. The lamp conforms to form factors and/or uses lamp base connectors of common incandescent lamps and/or compact fluorescent lamps. For efficient substitution of components during manufacture of lamps to different specifications, at least some examples use modular couplings for the parts of the lamp to the heat sink or other housing, such as for couplings of the lamp base, the bulb and the inner light processing member (if provided).

Claims

1. A light engine for a lamp, comprising:

a heat sink having;

(a) a first modular-coupling for attachment of a lighting industry standard lamp base, the first modular-coupling being configured for compatibility with each of a plurality of different lighting industry standard lamp bases each configured to connect the lamp to and provide electrical contact of the lamp with a corresponding lamp socket, and

(b) a second modular-coupling for attachment of one of a plurality of different types of bulbs;

a pedestal attached to and extending from the heat sink along a longitudinal axis of the light engine into a region to be surrounded by a bulb when the bulb is attached to the heat sink, the pedestal providing heat conductivity to and being supported by the heat sink; and

a plurality of solid state light emitters configured to emit light,

an end portion of the pedestal to be surrounded by the bulb having;

at least three substantially flat surfaces facing outward from the longitudinal axis of the lamp in different directions each supporting one or more of the solid state light emitters for emission of light in a different orientation, and an end face facing at least substantially along the longitudinal axis of the lamp supporting one or more of the solid state light emitters for emission of light on or about the longitudinal axis of the lamp, such that emissions outward from the pedestal from the solid state light emitters through the bulb when the bulb is attached to the heat sink approximate light source emissions from a filament of an incandescent lamp.

2. The light engine of claim 1, further comprising:

an inner member, of a material that is at least partially light transmissive, positioned and configured radially around the solid state light emitters supported on the substantially flat surfaces and longitudinally around the one or more of the solid state light emitters supported on the end face of the pedestal, between an inner surface of the bulb and the solid state light emitters on the pedestal and at distances from the inner surface of the bulb and the solid state emitters on the pedestal.

3. The light engine of claim 2, further comprising:

at least one semiconductor nanophosphor, remotely deployed in the light engine with respect to the solid state light emitters via the inner member, each semiconductor nanophosphor being of a type for converting at least some portion of light from the solid state light emitters from a first spectral characteristic to a second spectral characteristic, to produce a white light output of the light engine for emission via the bulb, wherein;

each semiconductor nanophosphor is of a type for converting at least some portion of a near UV wavelength range from the solid state emitter,

visible light output from the light engine produced upon excitation of the semiconductor nanophosphors by light from the solid state emitters is at least substantially white,

the substantially white light output from the light engine has a color rendering index (CRI) of 75 or higher, and

the substantially white light output from the light engine has a color temperature in one of the following ranges;

2,725±

145°

Kelvin;

3,045±

175°

Kelvin;

3,465±

245°

Kelvin;

3,985±

275°

Kelvin;

4503±

243°

Kelvin;

5028±

283°

Kelvin;

5665±

355°

Kelvin; and

6530±

510°

Kelvin.

4. The light engine of claim 2, wherein the inner member comprises:

a cylinder of a material that is at least partially light transmissive, positioned and configured to radially surround the solid state light emitters on the flat surfaces of the pedestal; and

a dome of a material that is at least partially light transmissive, positioned at an end of the cylinder, and positioned and configured longitudinally around the one or more of the solid state light emitters on the end face of the pedestal.

5. The light engine of claim 3, wherein the at least one semiconductor nanophosphor comprises a doped semiconductor nanophosphor.

6. The light engine of claim 3, wherein the substantially white light corresponds to a point on a black body radiation spectrum.

7. The light engine of claim 3, wherein the inner member comprises:

a cylinder of a material that is at least partially light transmissive, positioned and configured to radially surround the solid state light emitters on the flat surfaces of the pedestal; and

a dome of a material that is at least partially light transmissive, positioned at an end of the cylinder, and positioned and configured longitudinally around the one or more of the solid state light emitters on the end face of the pedestal.

8. The light engine of claim 1, wherein the solid state light emitters are emitters for emitting light that is at least substantially white at a color temperature greater than 4,260°

Kelvin.

9. The light engine of claim 1, wherein each of the solid state light emitters is rated with a principal wavelength of emission in a range of about 460 nm and below.

10. The light engine of claim 1, further comprising circuitry at least partially enclosed by the heat sink connected to drive the solid state emitters in response to electricity received from a lamp base when attached to the heat sink at the first modular-coupling.

11. The light engine of claim 1, wherein the heat sink has a third modular-coupling for attachment of one of a plurality of different light transmissive members so as to be located radially and longitudinally around and spaced from the solid state light emitters supported on the flat surfaces and the end face of the pedestal.

12. The light engine of claim 1, wherein the a first modular-coupling is configured for compatibility with two or more types of standard lamp bases selected from the group consisting of:

an Edison base, a mogul base, a candelabra base, a bi-pin base, a three-way mogul lamp base and a three-way medium lamp base.

13. The light engine of claim 1, wherein:

the pedestal comprises a heat pipe having an end forming a cold interface connected to the heat sink, and

the end portion of the pedestal is a thermal core attached to an end of the heat sink forming a hot interface.

14. The light engine of claim 13, wherein the end of the heat pipe forming the cold interface includes one or more coils connected to the heat sink.