Backlit lamp having directional light source

• US 10,415,766 B2
• Filed: 02/28/2017
• Issued: 09/17/2019
• Est. Priority Date: 02/28/2017
• Status: Active Grant

• Current Assignee: Feit Electric Company Incorporated
• Original Assignee: Feit Electric Company Incorporated
• Inventors: Feit, Alan Barry, Mata, Jose
• Primary Examiner(s): Mai, Anh T
• Assistant Examiner(s): Horikoshi, Steven Y
• Application Number:
  US15/445,304
• Publication Number:
  US 20180245746A1
• Time in Patent Office: 931 Days
• CPC Class Codes: F21K 9/233 specially adapted for generating a spot light distribution, e.g. for substitution of reflector lamps
• CPC Class Codes: F21K 9/237 Details of housings or cases, i.e. the parts between the light-generating element and the bases; Arrangement of components within housings or cases F21K9/238 takes precedence
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 7/0016 on lighting devices that also provide for direct lighting, e.g. by means of independent light sources, by splitting of the light beam, by switching between both lighting modes
• CPC Class Codes: F21Y 2105/16 square or rectangular, e.g. for light panels
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

An example embodiment of a backlit lamp comprises a housing, a forward facing directional light source and a rear facing directional light source. The housing may comprise a bowl portion comprising a first joining end and a forward emitting end; and a neck portion comprising a second joining end. The bowl and neck portions are joined at the first and second joining ends. The forward facing directional light source is mounted within the housing and configured to emit light in the direction of the forward emitting end. The rear facing directional light source is mounted within the housing and configured to emit light in an opposite direction from the light emitted by the forward facing directional light source. In an example embodiment, the forward facing and rear facing directional light source comprise light emitting diodes (LEDs).

Claims

1. A light emitting diode (LED) lamp comprising:

a housing, the housing comprising;

a bowl portion comprising a first joining end, a forward emitting end, and a sloped interior surface;

a neck portion comprising a second joining end, wherein the bowl portion and the neck portion are joined at the first joining end and the second joining end;

one or more forward facing LED packages;

at least one rear facing LED package; and

a heat sink having a forward surface, a rear surface, an opening passing between the forward and rear surfaces, and a sloped side portion having an exterior surface corresponding to and disposed adjacent the sloped interior surface of the bowl portion,

wherein;

the one or more forward facing LED packages are mounted to the forward surface within the housing and configured to emit light in the direction of the forward emitting end,

the at least one rear facing LED is mounted to the rear surface within the housing and configured to emit light away from the forward emitting end,

electrical leads for the one or more forward facing LED packages pass through the opening from the rear surface to the forward surface,

the sloped interior surface of the bowl portion is at least partially covered with a coating, and

a portion other than the rear surface of the heat sink is mounted within the housing by a thermally conductive material, such that the heat sink is in thermal contact with the coating, such that heat emitted by at least the one or more forward facing LED packages and the at least one rear facing LED is passed, via the heat sink, to the coating.

2. The LED lamp of claim 1, wherein:

the heat sink comprises;

a sloped portion defining the sloped interior surface; and

a bottom portion, the bottom portion comprising the forward surface and the rear surface;

the sloped portion extends from a perimeter of the bottom portion; and

the forward surface is bordered by the sloped portion.

3. The LED lamp of claim 2, wherein

the one or more forward facing LED packages are mounted on a forward board,

the at least one rear facing LED package is mounted on a component board,

the forward board is mounted to the forward surface, and

the component board is mounted to the rear surface.

4. The LED lamp of claim 3, further comprising one or more driver circuit components, the one or more driver circuit components being mounted on the component board.

5. The LED lamp of claim 1, wherein the sloped interior surface of the bowl portion is fully covered by the coating.

6. The LED lamp of claim 1, wherein the neck portion further comprises a base end disposed opposite the second joining end and a neck cavity disposed between the base end and the second joining end.

7. The LED lamp of claim 6, wherein the neck cavity comprises an open space having component electrical leads passing there-through.

8. The LED lamp of claim 7, wherein the component electrical leads provide electrical communication between one or more electrical contacts of a base secured to the base end and one or more driver circuitry components mounted within the housing.

9. The LED lamp of claim 6, wherein the neck cavity does not contain any driver circuitry components.

10. The LED lamp of claim 1, further comprising:

a base secured to the base end; and

an optical component enclosing the forward emitting end.

11. The LED lamp of claim 1, wherein a sidewall of the neck portion is (a) clear or (b) frosted.

12. A backlit lamp comprising:

a housing, the housing comprising;

a bowl portion comprising a first joining end, a forward emitting end, and a sloped interior surface;

a neck portion comprising a second joining end, wherein the bowl portion and the neck portion are joined at the first joining end and the second joining end;

a forward facing directional light source;

a rear facing directional light source; and

a heat sink having a forward surface, a rear surface, an opening passing between the forward and rear surfaces, and a sloped side portion having an exterior surface corresponding to and disposed adjacent the sloped interior surface of the bowl portion,

wherein;

the forward facing directional light source is mounted to the forward surface within the housing and configured to emit light in the direction of the forward emitting end,

the rear facing directional light source is mounted to the rear surface within the housing and configured to emit light in an opposite direction from the light emitted by the forward facing directional light source, and

electrical leads for the forward facing directional light source pass through the opening from the rear surface to the forward surface,

the sloped interior surface of the bowl portion is at least partially covered with a coating, and

a portion other than the rear surface of the heat sink is mounted within the housing by a thermally conductive material, such that the heat sink is in thermal contact with the coating, such that heat emitted by at least the one or more forward facing LED packages and the at least one rear facing LED is passed, via the heat sink, to the coating.

13. The backlit lamp of claim 12, wherein (a) the neck portion further comprises a base end and a sidewall extending between the base end and the second joining end and (b) at least a portion of light emitted by the rear facing directional light source passes through the sidewall.

14. The backlit lamp of claim 12, further comprising:

a base secured to the base end, the base end being an end of the neck and disposed opposite the second joining end; and

an optical component enclosing the forward emitting end.

15. The backlit lamp of claim 12, wherein a sidewall of the neck portion is (a) clear or (b) frosted.

16. The backlit lamp of claim 12, wherein the neck portion further comprises a base end disposed opposite the second joining end and a neck cavity disposed between the base end and the second joining end.

17. The backlit lamp of claim 16, wherein the neck cavity comprises an open space having component electrical leads passing there-through.

18. The backlit lamp of claim 17, wherein the electrical leads provide electrical communication between one or more electrical contacts of a base secured to the base end and the rear and forward facing directional light sources.