# US 2014/0153233 A1 · Solid state lighting device

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- Number: US 2014/0153233 A1
- Document ID: US20140153233A1
- Status: Published application
- Kind: A1
- Application number: 14/176,250
- Filed: 2014-02-10
- Published: 2014-06-05
- Earliest claimed: 2011-10-19
- Assignees: Cree, Inc.
- Applicants: Cree, Inc.
- Inventors: Paul Kenneth Pickard; Nicholas W. Medendorp, JR.; Michael James Harris; James Michael Lay
- Web page: https://patentgrep.com/patent/US20140153233A1

## CPC

- F21V 29/70: characterised by passive heat-dissipating elements, e.g. heat-sinks
- F21K 9/60: Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
- F21S 8/02: of recess-mounted type, e.g. downlighters (specially adapted for vehicle exteriors F21S41/00-F21S45/00)
- F21V 7/24: characterised by the material
- F21V 29/74: with fins or blades
- F21V 29/85: characterised by the material (liquid coolants F21V29/56)
- F21K 9/238: Arrangement or mounting of circuit elements integrated in the light source
- F21V 23/006: {the substrate being distinct from the light source holder}
- F21Y 2115/10: Light-emitting diodes [LED]
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21K: NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED

## Abstract

A lighting device is disclosed comprising a plurality of light emitters and a heat spreader plate thermally coupled to the plurality of light emitters, wherein the plurality of solid state emitters provides a thermal load upon application of an operating current and voltage, the heat spreader plate dissipating substantially all of the thermal load to an ambient air environment.

## Claims

### Claim at position 1

1-39. (canceled)

### Claim 40

A solid state lighting device comprising:
a plurality of solid state emitters; and
a heat spreader plate of thermally conductive material having a base in thermal communication with the plurality of solid state emitters,
at least one sidewall projecting from the base, the at least one sidewall thermally coupled to the heat spreader plate; and
at least one of a substantially non-metallic housing, a substantially non-metallic trim element, and a substantially non-metallic reflector.

### Claim 41 (depends on 40)

The solid state lighting device of claim 40, wherein the at least one sidewall is configured as wires, strips, bands, connected dots, connected islands, or as a spider web arrangement.

### Claim 42 (depends on 40)

The solid state lighting device of claim 40, wherein the substantially non-metallic housing, the substantially non-metallic trim element, and the substantially non-metallic reflector comprises plastic.

### Claim 43 (depends on 42)

The solid state lighting device of claim 42, wherein at least a portion of the housing and/or the trim element and/or the reflector comprises thermally conductive plastic.

### Claim 44 (depends on 40)

The solid state lighting device of claim 40, wherein the least one sidewall projects substantially non-parallel from the longitudinal axis of the base.

### Claim 45 (depends on 40)

The solid state lighting device of claim 40, wherein the at least one sidewall projects substantially parallel to the principal axis of the lighting device.

### Claim 46 (depends on 40)

The solid state lighting device of claim 40, wherein the base portion and the at least one sidewall form an L-like shape.

### Claim 47 (depends on 40)

The solid state lighting device of claim 40, wherein the ratio of thermal conductivity of the heat spreader plate and the housing and/or the trim element and/or the reflector is between about 10:1 to about 1000:1.

### Claim 48 (depends on 40)

The solid state lighting device of claim 40, wherein the lighting device is devoid of graphite heat spreaders and/or thermal gap pads.

### Claim 49 (depends on 40)

The solid state lighting device of claim 40, further comprising a thermal path between the heat spreader plate and the ambient, the thermal path comprising metal and/or thermally conductive plastic in thermal communication with the heat spreader plate.

### Claim 50 (depends on 40)

The solid state lighting device of claim 40, wherein the heat spreader plate is capable of dissipating at least about 2 Watts in an ambient air environment of about 35 degrees Centigrade while maintaining a junction temperature of the solid state emitter at or below about 95 degrees Centigrade.

### Claim 51 (depends on 40)

The solid state lighting device of claim 40, wherein the heat spreader plate is sized to fit within a downlight can assembly.

### Claim 52 (depends on 40)

The solid state lighting device of claim 40, wherein the plurality of solid state emitters are of at least 5 in number.

### Claim 53 (depends on 40)

The solid state lighting device of claim 40, wherein the plurality of solid state emitters are of at least 20 in number.

### Claim 54 (depends on 40)

The solid state lighting device of claim 40, wherein the plurality of solid state emitters provides: a total luminosity of about 700 lumens to about 800 lumens at about 110 lumens per Watt to about 170 lumens per Watt; about 2500 K to about 2900 K correlated color temperature; and a color rendering index greater than or equal to 90.

### Claim 55 (depends on 40)

The solid state lighting device of claim 40, wherein the plurality of solid state emitters provides: a thermal load of not more than 5 Watts; a total luminosity of about 700 lumens to about 800 lumens at about 110 lumens per Watt to about 170 lumens per Watt; about 2500 K to about 2900 K correlated color temperature; and a color rendering index greater than or equal to 90.

### Claim 56

A solid state lighting device comprising:
a plurality of solid state emitters;
a metallic heat spreader plate having a base in thermal communication with the plurality of solid state emitters,
at least one sidewall projecting in a direction non-parallel from the longitudinal axis of the base; and
at least one of a substantially non-metallic housing, a substantially non-metallic trim element, and substantially non-metallic reflector;
wherein the ratio of thermal conductivity of the heat spreader plate and the housing and/or the trim element and/or the reflector is between about 10:1 to about 1000:1.

### Claim 57 (depends on 56)

The solid state lighting device of claim 56, wherein the base portion and the at least one sidewall portion form an L-like shape adapted to receive at least a portion of the reflector.

### Claim 58 (depends on 56)

The solid state lighting device of claim 56, wherein the at least one sidewall portion comprises a plurality of spatially segregated sidewall portions configured as wires, strips, bands, connected dots, connected islands, or as a spider web arrangement.

### Claim 59 (depends on 56)

The solid state lighting device of claim 56, wherein the base portion comprises at least one aperture configured to receive at least one electrical conductor operatively connected to the at least one solid state emitter.

### Claim 60 (depends on 56)

The solid state lighting device of claim 56, wherein the at least one of the housing, the trim element and the reflector comprise plastic.

### Claim 61 (depends on 60)

The solid state lighting device of claim 60, wherein at least a portion of the housing, the trim element and/or the reflector comprise thermally conductive plastic.

### Claim 62 (depends on 56)

The solid state lighting device of claim 56, further comprising a thermal path between the heat spreader plate and/or the trim element and/or the reflector and the ambient, the thermal path comprising metal and/or thermally conductive plastic in thermal communication with the heat spreader plate.

### Claim 63 (depends on 56)

The solid state lighting device of claim 56, wherein the trim element and the reflector are configured for snap-together assembly with each other.

### Claim 64

A solid state lighting device comprising:
a plurality of solid state emitters; and
a heat spreader plate in thermal communication with the plurality of solid state emitters, the heat spreader having a base and at least one sidewall portion projecting substantially non-parallel from the longitudinal axis of the base, and
at least one of a substantially non-metallic housing coupled to at least a portion of the heat spreader plate, a substantially non-metallic trim element, and substantially non-metallic reflector, and
a thermal path between the heat spreader plate and the ambient.

### Claim 65 (depends on 64)

The solid state lighting device of claim 64, wherein the ratio of thermal conductivity of the heat spreader plate and the housing and/or the trim element and/or the reflector is between about 10:1 to about 1000:1.

### Claim 66 (depends on 64)

The solid state lighting device of claim 64, wherein the plurality of solid state emitters provides: a thermal load not more than about 5 Watts; a total luminosity of about 700 lumens to about 800 lumens at about 110 lumens per Watt to about 170 lumens per Watt; about 2500 K to about 2900 K correlated color temperature; and a color rendering index greater than or equal to 90.

### Claim 67 (depends on 64)

The solid state lighting device of claim 64, wherein the thermal path comprises metal.

### Claim 68 (depends on 64)

The solid state lighting device of claim 64, further comprising a dielectric layer and at least one electrical trace deposited on a metallic sheet providing integral circuitry to the heat spreader plate.

### Claim 69 (depends on 64)

The solid state lighting device of claim 64, wherein at least a portion of the heat spreader plate structurally support a lens and/or reflector and/or fixture associated with a solid state lighting device.

### Claim 70 (depends on 64)

The solid state lighting device of claim 64, wherein the housing contains at least one of ballast, circuit driver, PCB board, a screw base connector, an electrical plug connector, and at least one terminal adapted to compressively retain an electrical conductor or current source element.