Light emitting diode indicator

• US 20040119603A1
• Filed: 12/23/2002
• Published: 06/24/2004
• Est. Priority Date: 12/23/2002
• Status: Active Grant

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: Metzger, Robert W., Schaeffer, Dwight R., Bohlander, Richard A.
• Granted Patent: US 6,924,744 B2
• Time in Patent Office: Days
• US Class Current: 340/815.45
• CPC Class Codes: B60Q 3/14 lighting through the surface to be illuminated
• CPC Class Codes: F21W 2111/00 Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00
• CPC Class Codes: F21Y 2107/90 on two opposite sides of supports or substrates
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: Y10S 362/80 Light emitting diode
• CPC Class Codes: Y10S 362/812 Signs

Abstract

A Light Emitting Diode (LED) indicator that more efficiently dissipates heat generated by LEDs and other circuit components is provided. The LED indicator includes a housing and a printed circuit board contained within the housing. The printed circuit board includes first and second sides with two or more LEDs attached to the first and second sides of the printed circuit board and a regulating circuit for regulating current supplied to the LEDs. The regulating circuit includes a linear voltage regulator. The printed circuit board includes first and second thermal dissipation sections. The first thermal dissipation section is thermally connected with the two or more LEDs and the second thermal dissipation section is thermally connected with the linear voltage regulator. The housing is at least partially lined with a plurality of reflectors for reflecting light generated by the LEDs through a lens.

Claims

1. A Light Emitting Diode (LED) indicator comprising:

a housing having a lens; and

a single printed circuit board contained within the housing perpendicular to the lens, the printed circuit board having first and second sides, the printed circuit board including;

two or more LEDs attached to the first and second sides of the printed circuit board; and

one or more current regulators for regulating current supplied to the LEDs.

2. The indicator of claim 1, wherein the single printed circuit board is manufactured using fully automated processes.

3. The indicator of claim 1, wherein the housing includes a reflector for redirecting light generated by the two or more LEDs toward the lens.

4. A Light Emitting Diode (LED) indicator comprising:

a housing; and

a printed circuit board contained within the housing, the printed circuit board having first and second sides, the printed circuit board including;

two or more LEDs attached to the first and second sides of the printed circuit board; and

one or more current regulators for regulating current supplied to the LEDs.

5. The indicator of claim 4, wherein the regulator includes a linear current regulator.

6. The indicator of claim 5, wherein the printed circuit board includes first and second thermal dissipation sections.

7. The indicator of claim 5, wherein the first and second thermal dissipation sections are separated by a thermal isolator.

8. The indicator of claim 5, wherein the first thermal dissipation section is thermally connected with the two or more LEDs and the second thermal dissipation section is thermally connected with the linear current regulator.

9. The indicator of claim 7, wherein the housing includes two opposing covers being thermally coupled with the first and second thermal dissipation sections.

10. The indicator of claim 4, wherein the housing includes two opposing covers that form first and second cavities, wherein the second cavity is open at one end that is covered by a cap with a lens, the first cavity covering a first portion of the printed circuit board that include the regulator circuit, the second cavity covering a portion of the printed circuit board that includes two or more the LEDs.

11. The indicator of claim 10, wherein the second cavity is at least partially lined with a reflector for reflecting light generated by the two or more LEDs through the lens.

12. The indicator of claim 4, wherein the two or more LEDs include at least two different colored LEDs.

13. The indicator of claim 4, wherein a first set of two LEDs are connected in series to a first regulator and a second set of two LEDs are connected in series to a second regulator.

14. The indicator of claim 13, the first set of LEDs and the first regulator are attached to the first side of the printed circuit board and the second set of LEDs and the second regulator are attached to the second side of the printed circuit board.

15. The indicator of claim 14, wherein the first and second sides of the printed circuit board include a layer of thermal patches, and a common thermal plane, the patches being electrically coupled to at least one of a lead from the LEDs or a lead from the regulators, wherein the common thermal patches are located between LEDs and patches and regulators and patches.

16. A method of making a Light Emitting Diode (LED) indicator, the method comprising:

attaching two or more LEDs to first and second sides of a printed circuit board; and

attaching a regulating circuit to the first side of the printed circuit board.

17. The method of claim 16, wherein the regulating circuit includes a linear current regulator.

18. The method of claim 17, wherein the printed circuit board includes first and second thermal dissipation sections.

19. The method of claim 18, further comprising thermally separating the first and second thermal dissipation sections.

20. The method of claim 18, further comprising thermally connecting the first thermal dissipation section with the two or more LEDs and thermally connecting the second thermal dissipation section with the linear current regulator.

21. The method of claim 20, further comprising covering the printed circuit board with a heat dissipating cover, wherein the heat dissipating cover includes two opposing sections that form first and second cavities, the second cavity being open at one end and being covered by a cap with a lens, the first cavity covering a first portion of the printed circuit board with the regulator circuit and the second cavity covering a second portion of the printed circuit board with the LEDs.

22. The method of claim 21, further comprising thermally connecting the first and second thermal dissipation sections with the heat dissipating cover.

23. The method of claim 21, further comprising partially lining the second cavity with reflector for reflecting light generated by the LEDs through the lens.

24. The method of claim 16, wherein the attached two or more LEDs include at least two different colored LEDs.