LED semiconductor lighting system

• US 6,158,882 A
• Filed: 06/30/1998
• Issued: 12/12/2000
• Est. Priority Date: 06/30/1998
• Status: Expired due to Fees

• Current Assignee: EMTEQ, Inc. (Rtx Corporation)
• Original Assignee: EMTEQ, Inc. (Rtx Corporation)
• Inventors: Bischoff, A. John Jr.
• Primary Examiner(s): Sember, Thomas M.
• Application Number:
  US09/108,055
• Time in Patent Office: 896 Days
• Field of Search: 362/488, 362/490, 362/489, 362/543, 362/544, 362/545, 362/249, 362/235, 362/251, 362/800, 362/250, 362/287, 362/471
• US Class Current: 362/488
• CPC Class Codes: B60Q 3/78 for generating luminous strips, e.g. for marking trim component edges
• CPC Class Codes: B60Q 3/80 Circuits; Control arrangements for dashboards B60Q3/16; for mass transit vehicles B60Q3/47
• CPC Class Codes: F21S 4/28 rigid, e.g. LED bars
• CPC Class Codes: F21V 23/005 the substrate is supporting also the light source
• CPC Class Codes: F21V 23/04 the elements being switches safety devices F21V25/00
• CPC Class Codes: F21V 23/06 the elements being coupling devices , e.g. connectors
• 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: Y10S 362/80 Light emitting diode

Abstract

An LED semiconductor lighting system that comprises a lighting apparatus for illuminating vehicle interiors and powered by a source of electrical power provided by or on the vehicle. The lighting apparatus comprises a light tube with an interior space and has a plurality of light emitting diodes and current limiting resistors contained within such interior space of the light tube. The illumination intensity of the light emitting diodes is controlled by a dimming module in electrical contact with the LEDs and electrically connected to the vehicle source of power. An alternative embodiment of the lighting apparatus includes a flexible light tube.

Claims

1. A lighting apparatus for illuminating vehicle interiors and powered by a source of electrical power provided by the vehicle, said lighting apparatus comprising:

a light tube with an interior space and having at least one circuit board channel,

a circuit board installed in the circuit board channel with said circuit board having a top side and a bottom side with either of said sides supporting a circuit trace forming a circuit connection,

a plurality of light emitting diodes mounted on the circuit board in electrical contact with the circuit trace

a plurality of current limiting resistors mounted on the circuit board in electrical contact with the circuit trace and in series with said light emitting diodes, and

a dimming module having a voltage regulator electrically connected to the vehicle source of electrical power, and having a feedback circuit connected to the voltage regulator and to the circuit trace on the circuit board whereby illumination intensity of the light emitting diodes can be varied.

2. The lighting apparatus of claim 1 wherein the dimming module comprises a voltage converter electrically connected to the vehicle source of electrical power and to said a feedback circuit.

3. The lighting apparatus of claim 2 wherein the voltage converter is a converter selected from a group consisting of a DC-DC type, an AC-DC type and a DC-AC type.

4. The lighting apparatus of claim 1 wherein the light emitting diodes produce white light.

5. The light apparatus of claim 1 wherein the circuit board is flexible.

6. The lighting apparatus of claim 1 wherein the light emitting diodes and the current limiting resistors are surface mounted on the circuit board.

7. The lighting apparatus of claim 1 wherein the light tube is flexible.

8. The lighting apparatus as recited in claim 1 wherein the plurality of light emitting diodes are divided into a plurality of groups each having at least two light emitting diodes connected in series and with the plurality of groups being connected in parallel.

9. The lighting apparatus as recited in claim 8 each of the plurality of resistors is connected in series with a different one of the plurality of groups of light emitting diodes.

10. A lighting apparatus for illuminating vehicle interiors and powered by a source of electrical power provided on the vehicle, said lighting apparatus comprising:

a light tube with an interior space,

a plurality of circuit boards contained within the interior space and electrically interconnected, with each circuit board having a circuit trace thereon,

a least one light emitting diode mounted on each circuit board in electrical contact with the circuit trace

a plurality of current limiting resistors selectively mounted on the circuit boards in electrical contact with the circuit trace and in series with said light emitting diodes, and

a dimming module having a voltage regulator electrically connected to the vehicle source of electrical power, and having a feedback circuit connected to the voltage regulator and to the circuit trace on the circuit board whereby illumination intensity of the light emitting diodes can be varied.

11. The lighting apparatus of claim 10 wherein the dimming module comprises a voltage converter electrically connected to the vehicle source of electrical power and said a feedback circuit.

12. The lighting apparatus of claim 11 wherein the voltage converter is a converter selected from a group consisting of a DC-DC type, an AC-DC type and a DC-AC type.

13. The lighting apparatus of claim 10 wherein the light emitting diodes produce white light.

14. The lighting apparatus of claim 10 wherein the light emitting diodes and the current limiting resistors are surface mounted on the circuit board.

15. The lighting apparatus of claim 10 wherein the light tube is flexible.

16. A lighting apparatus for illuminating vehicle interiors and powered by a source of electrical power provided on the vehicle, said lighting apparatus comprising:

a light tube with an interior space,

a plurality of light emitting diodes electrically interconnected and contained within said interior space,

a plurality of current limiting resistors selectively electrically interconnected with said diodes and contained within said interior space, and

a dimming module in electrical contact with the diodes and resistors in said tube and with the vehicle source of electrical power, wherein illumination intensity of the light emitting diodes can be varied,

a dimming module in electrical contact with the light emitting diodes and resistors in said tube, said dimming module having a voltage regulator electrically connected with the vehicle source of electrical power, and having a feedback circuit connected to the voltage regulator and to the light emitting diodes whereby illumination intensity of the light emitting diodes can be varied.

17. The lighting apparatus of claim 16 wherein the dimming module comprises a voltage converter electrically connected to the vehicle source of electrical power and said a feedback circuit.

18. The lighting apparatus of claim 16 wherein the voltage converter is a converter selected from a group consisting of a DC-DC type, an AC-DC type and a DC-AC type.

19. The lighting apparatus of claim 16 wherein the light emitting diodes produce white light.

20. The lighting apparatus of claim 16 wherein the light tube is flexible.

21. The lighting apparatus as recited in claim 19 wherein the plurality of light emitting diodes are divided into a plurality of groups each having at least two light emitting diodes connected in series and with the plurality of groups being connected in parallel.

22. The lighting apparatus as recited in claim 21 each of the plurality of resistors is connected in series with a different one of the plurality of groups of light emitting diodes.