Lighting apparatus

• US 8,079,731 B2
• Filed: 08/08/2007
• Issued: 12/20/2011
• Est. Priority Date: 09/22/2003
• Status: Expired due to Fees

• Current Assignee: Permlight Products Inc
• Original Assignee: Permlight Products Inc
• Inventors: Lynch, Manuel, Fraitag, Lenny, Wijesinghe, Rehana
• Primary Examiner(s): Lee, Diane
• Assistant Examiner(s): ZETTL, MARY E
• Application Number:
  US11/836,057
• Publication Number:
  US 20080055915A1
• Time in Patent Office: 1,595 Days
• Field of Search: 362/231, 362/240, 362/249, 362/365, 362/646, 362/800, 362/249.01, 362/249.02, 257/99, 200/314, 361/679, 361/728, 361807-810, 361823-828
• US Class Current: 362/249.02
• CPC Class Codes: F21S 2/005 of modular construction
• CPC Class Codes: F21S 4/10 with light sources attached to loose electric cables, e.g. Christmas tree lights
• CPC Class Codes: F21S 4/28 rigid, e.g. LED bars
• CPC Class Codes: F21V 15/01 Housings, e.g. material or assembling of housing parts F21V15/02 takes precedence housings forming signs or letters G09F13/04
• CPC Class Codes: F21V 17/12 by screwing
• CPC Class Codes: F21V 21/02 Wall, ceiling, or floor bases; Fixing pendants or arms to the bases F21V21/08 takes precedence; bases for movable standing lamps F21V21/06
• CPC Class Codes: F21V 23/00 Arrangement of electric circuit elements in or on lighting devices characterised by cooling arrangements F21V29/508
• CPC Class Codes: F21V 23/06 the elements being coupling devices , e.g. connectors
• CPC Class Codes: F21V 25/04 breaking the electric circuit
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21V 29/745 the fins or blades being planar and inclined with respect to the joining surface from which the fins or blades extend
• CPC Class Codes: F21V 29/76 with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
• CPC Class Codes: F21V 3/04 characterised by materials, surface treatments or coatings
• CPC Class Codes: F21V 31/04 Provision of filling media
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A lighting apparatus is provided including an array of light emitting diodes (LEDs) disposed on a base. The base is configured to move heat away from the array of LEDs to other portions of the base and further to the atmosphere or an adjacent housing. In one embodiment, a native oxide on the base electrically insulates the base from the LEDs. In another embodiment, a cover is removably disposed over the array of LEDs, and removal of the cover prevents electrical energization of the LEDs.

Claims

1. A lighting apparatus, comprising:

a first and a second elongate heat conductive base, each base having a surface and a longitudinal axis;

a plurality of contacts supported on the surface of each base, the plurality of contacts comprising a first terminus and a second terminus, the contacts being electrically insulated relative to the associated base;

at least one LED disposed on each plurality of contacts and arranged so that an electrical pathway is established from the first terminus to the second terminus through the LED;

a first and a second power module, each power module configured to receive an input electric power, modify the power and supply and output electric power between the first terminus and second terminus of an associated base;

each power module comprising a mount surface, the first base being attached to the first power module mount surface, the second base being attached to the second power module mount surface;

each base having a second surface generally opposite the surface upon which the at least one LED is disposed, the second surface of the base being connected to the respective power module mount surface;

each base being connected to the respective power module by threaded fasteners, the fasteners each having an elongate shank portion that extends through the base and into the power module, the fasteners being electrically isolated from the base, the fasteners conducting modified electric power from the power module past the base and to the first and second terminus;

an elongate housing having a longitudinal axis and comprising a heat conductive material, the housing having opposing housing walls that are generally parallel to the longitudinal axis, and an opening adjacent the housing walls so that a channel is defined extending along the length of the housing parallel to the housing longitudinal axis; and

an elongate spacer sized and adapted to fit slidably at least partially within the housing channel;

wherein the first and second heat conductive bases are arranged in the housing so that the heat conductive base surface of each base slidably engages a housing wall generally along the length of the base in a manner so that heat from each LED is directed from the LED into the respective base and from the base surface through the housing wall and into the housing and the LED is generally aligned with the housing opening; and

wherein the elongate spacer is disposed in the channel between the first and second heat conductive bases so that the first and second heat conductive bases are spaced apart from one another within the housing channel.

2. A lighting apparatus as in claim 1, wherein each base comprises a metal.

3. A lighting apparatus as in claim 2, wherein the housing comprises a metal.

4. A lighting apparatus as in claim 3, wherein the housing comprises a plurality of fins.

5. A lighting apparatus as in claim 1, wherein the housing wall is generally complementary to the base surface.

6. A lighting apparatus as in claim 5, wherein the at least one LED is disposed on the base surface generally centrally, and wherein a portion of the base surface generally adjacent one or more edges of the base surface engages the housing wall.

7. A lighting apparatus as in claim 1, wherein each power module comprises first and second threaded power nodes, and a first and a second threaded fastener are electrically conductive and threadingly engage the first and second power nodes, respectively, so as to hold the base in a position relative the power module and to electrically connect the first and second nodes to respective ones of the first and second terminus so as to supply electrical power across the electrical pathway when the fasteners are in place.

8. A lighting apparatus as in claim 1, wherein the first power module outputs unmodified input electric power to the second power module.

9. A lighting apparatus, comprising:

a heat conductive base having a surface;

a plurality of contacts supported on the surface of the base, the plurality of contacts comprising a first terminus and a second terminus;

at least one LED disposed on the contacts and arranged so that an electrical pathway is established from the first terminus to the second terminus through the LED;

a housing comprising a heat conductive material, the housing having a housing wall and an opening adjacent the housing wall;

a power module adapted to supply electric power between the first terminus and second terminus, wherein the base is attached to the power module, the power module comprising first and second threaded power nodes; and

a first and a second threaded fastener;

wherein the base has a second surface generally opposite the surface upon which the at least one LED is disposed, and the second surface of the base is connected to the power module by the first and second threaded fasteners so that the base is interposed between the power module and the plurality of contacts, the first and second threaded fasteners being electrically conductive and threadingly engaging the first and second power nodes, respectively, so as to hold the base in a position relative the power module and to electrically connect the first and second nodes to respective ones of the first and second terminus so as to supply electrical power across the electrical pathway when the fasteners are in place;

wherein the first and second threaded fasteners are electrically connected to the first and second terminus, respectively, such that the fasteners extend transversely across the base between the first and second base surfaces but are electrically isolated from the base; and

wherein the heat conductive base is arranged in the housing so that the heat conductive base surface engages the housing wall in a manner so that heat from the LED is directed from the LED into the base and from the base surface through the housing wall and into the housing, and the LED is generally aligned with the housing opening.

10. A lighting apparatus as in claim 9, wherein the base is comprised of an electrically conductive material and a layer of oxide on said material, and the plurality of contacts are disposed on the oxide.

11. A lighting apparatus as in claim 10, wherein the oxide is a native oxide of the electrically conductive material.

12. A lighting apparatus as in claim 9 additionally comprising a selectively removable cover configured to fit over the at least one LED, the cover comprising an electrically conductive portion, wherein the electrically conductive portion of the cover is configured to electrically communicate with the contacts through a selectively releasable electrical and mechanical connection so that electrical current flows between the cover and the contacts when the cover is in an installed position, and electrical current flow is interrupted when the cover is removed.

13. A lighting apparatus as in claim 12, wherein the at least one LED is configured to emit ultraviolet light, and the cover comprises a phosphor.