Channel letter lighting using light emitting diodes

• US 20030063463A1
• Filed: 09/30/2002
• Published: 04/03/2003
• Est. Priority Date: 10/01/2001
• Status: Active Grant

• Current Assignee: Sloan Company Incorporated (Sloan), Sloanled Incorporated
• Original Assignee: Sloanled Incorporated
• Inventors: Quaal, Bruce, Sloan, Thomas C.
• Granted Patent: US 6,932,495 B2
• Time in Patent Office: Days
• US Class Current: 362/238
• CPC Class Codes: F21S 4/20 with light sources held by or within elongate supports
• CPC Class Codes: F21V 21/0808 Adhesive means
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21V 29/76 with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
• 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]
• CPC Class Codes: G09F 13/0404 the light source being enclosed in a box forming the character of the sign
• CPC Class Codes: G09F 13/22 electroluminescent electroluminescent light sources per se H05B33/00
• CPC Class Codes: Y10S 362/80 Light emitting diode
• CPC Class Codes: Y10S 362/812 Signs

Abstract

A channel letter lighting unit according to the present invention comprises a printed circuit board (PCB) having a plurality of linearly mounted light emitting elements. Input wires transmit a power signal to the PCB to illuminate the plurality of light emitting elements, and output wires transmit the power signal from the PCB. The PCB is mounted in the extrusion and the light emitting elements transmit light away from the extrusion. The extrusion promotes the dissipation of heat from the light emitting elements. A mounting mechanism is included for mounting the extrusion within a housing. A further embodiment according to the invention comprises a plurality of channel lighting units electrically connected to one another so that a power signal applied to the lighting system is transmitted to each of the plurality of lighting units. A still further embodiment according to the invention comprises an illuminated channel letter system having a housing in the shape of a letter. A translucent lens is included over the housing to transmit light from within the housing. A plurality of channel lighting units are mounted within the housing and coupled to one another in a daisy chain. A power signal applied to the first of the plurality of lighting units in the daisy chain is transmitted to the remaining of the plurality of lighting units.

Claims

1. A channel letter lighting unit, comprising:

a printed circuit board (PCB) having a plurality of linearly mounted light emitting elements;

input wires to transmit a power signal to said PCB to illuminate said plurality of light emitting elements;

an thermally conductive extrusion, said PCB mounted to said extrusion with said light emitting elements transmitting light away from said extrusion, said extrusion conducting and dissipating heat from said light emitting elements; and

a mounting mechanism for mounting said extrusion within a housing.

2. The unit of claim 1, further comprising output wires to transmit said power signal from said PCB.

3. The unit of claim 1, wherein said extrusion has fins to dissipate heat from said light emitting elements.

4. The unit of claim 1, wherein each of said plurality of light emitting elements is a light emitting diodes (LED).

5. The unit of claim 2, further comprising a power input connector on the end of said input wires opposite said PCB and output connector on the end of said output wires opposite said PCB.

6. The unit of claim 1, wherein said plurality of light emitting elements emit different wavelengths of light that combine to create another wavelength of light.

7. The unit of claim 1, wherein said plurality of light emitting elements comprises one or more amber LEDs and one or more green LEDs.

8. The unit of claim 1, wherein said plurality of light emitting elements comprises LEDs emitting at different wavelengths of light, said unit capable of emitting each said different wavelength alone or in combination with other wavelengths of light.

9. The unit of claim 1, wherein said plurality of light emitting elements comprises one or more red LEDs, one or more blue LEDs, one or more green LEDs, each of which emits light alone or in combination with others.

10. The unit of claim 1, wherein said plurality of light emitting elements comprises two red LEDs.

11. The unit of claim 1, wherein said PCB is mounted to said extrusion with a thermally conductive material, which holds said PCB to said extrusion and conducts heat from said PCB to said extrusion.

12. The unit of claim 2, said PCB further comprising connection points for said input and output wires, said input wire connection points adjacent to said output wire connection points to reduce transmission loss.

13. The unit of claim 1, wherein said mounting mechanism comprises double sided tape.

14. The unit of claim 1, wherein said input and output connectors extend in opposite directions from said unit.

15. A lighting system, comprising:

a plurality of lighting units electrically connected to one another so that a power signal applied to the lighting system is transmitted to each of said plurality of lighting units, each of said units comprising;

a plurality of linearly mounted light emitting elements;

input wires to transmit said power signal to and illuminate said plurality of light emitting elements, said input wires capable of receiving said power signal from another of said plurality of lighting elements;

output wires to transmit said power signal from said PCB, said output wires capable of transmitting said power signal to another of said plurality of lighting units;

an extrusion, said light emitting elements mounted to said extrusion, said light emitting elements transmitting light away from said extrusion, said extrusion also promoting dissipation of heat from said light emitting elements; and

a mounting mechanism on each of said plurality of units, for mounting said extrusion within a housing.

16. The system of claim 15, further comprising a printed circuit board (PCB), said light emitting elements mounted to said PCB, and said input and output wires connected to said PCB, said PCB mounted to said extrusion.

17. The system of claim 16, further comprising a power input connector on the end of said input wires opposite said PCB and output connector on the end of said output wires opposite said PCB, said connectors connectable to connectors on others of said plurality of units, said plurality of units connected in a daisy-chain.

18. The system of claim 15, further comprising Y connectors to provide branches in the interconnection of said plurality of lighting units.

19. The system of claim 15, wherein said extrusion is made of a rigid and heat conductive material, said extrusion conducting and dissipating heat from said light emitting elements.

20. The system of claim 15, wherein said extrusion has fins to dissipate heat from said light emitting elements.

21. The system of claim 15, wherein each of said plurality of light emitting elements are light emitting diodes (LED).

22. The system of claim 15, wherein said plurality of light emitting elements on each of said plurality of lighting units emit different wavelengths of light that combine to create another wavelength of light.

23. The system of claim 15, wherein said plurality of light emitting elements on each of said plurality of lighting units comprises one or more amber LEDs and one or more green LEDs.

24. The system of claim 15, wherein said plurality of light emitting elements on each of said plurality of lighting units comprises LEDs emitting at different wavelengths of light, said unit capable of emitting each said different wavelength alone or in combination with other wavelengths of light.

25. The system of claim 15, wherein said plurality of light emitting elements on each of said plurality of lighting units comprises one or more red LEDs, one or more blue LEDs, and one or more green LEDs, each of which emits alone or in combination with others.

26. The system of claim 15, wherein said plurality of light emitting elements on each of said plurality of lighting units comprises two red LEDs.

27. The system of claim 16, said PCB further comprising connection points for said input and output wires, said input wire connection points adjacent to said output wire connection points to reduce transmission loss.

28. An illuminated channel letter system, comprising:

a housing in the shape of a letter;

a translucent lens over said housing to transmit light from within said housing;

a plurality of channel lighting units mounted within said housing and coupled to one another in a daisy-chain, a power signal applied to the first of said plurality of lighting units in said daisy-chain transmitted to the remaining of said plurality of lighting units, each of said plurality of lighting units comprising;

an extrusion with one or more light emitting elements, said extrusion capable of dissipating at least some of the heat from said light emitting elements; and

a mechanism for mounting said extrusion within said housing, the light from said one or more light emitting elements transmitted through said translucent lens.

29. The system of claim 28, further comprising a printed circuit board (PCB), said light emitting elements mounted to said PCB, and said PCB mounted to said extrusion.

30. The system of claim 28, wherein each of said plurality of lighting units comprises input wires to transmit said power signal to and illuminate said plurality of light emitting elements, said input wires capable of receiving said power signal from another of said plurality of lighting elements and output wires to transmit said power signal from said PCB, said output wires capable of transmitting said power signal to another of said plurality of lighting units.

32. The system of claim 28, further comprising a power input connector on the end of said input wires opposite said PCB and output connector on the end of said output wires opposite said PCB, said connectors connectable to connectors on others of said plurality of units, said plurality of units connected in a daisy-chain.

33. The system of claim 28, further comprising Y connectors to provide branches in the interconnection of said plurality of lighting units.

34. The system of claim 28, wherein each of said plurality of light emitting elements is a light emitting diode (LED).

35. The system of claim 28, wherein said plurality of light emitting elements on each of said plurality of lighting units emit different wavelengths of light that combine to create another wavelength of light.

36. The system of claim 28, wherein said plurality of light emitting elements on each of said plurality of lighting units comprises one or more amber LEDs and one or more green LEDs.

37. The system of claim 28, wherein said plurality of light emitting elements on each of said plurality of lighting units comprises a plurality of groups of LEDs, each of which emits a different wavelength of light, and each of which emits light alone or in combination with the others of said plurality of groups.

38. The system of claim 28, wherein said plurality of light emitting elements on each of said plurality of lighting units comprises two red LEDs.

39. The system of claim 29, said PCB further comprising connection points for said input and output wires, said input wire connection points adjacent to said output wire connection points to reduce transmission loss.