Catadioptric light emitting diode assembly

• US 6,414,801 B1
• Filed: 01/13/2000
• Issued: 07/02/2002
• Est. Priority Date: 01/14/1999
• Status: Expired due to Term

• Current Assignee: Truck-Lite Company LLC (Truck-Lite Holdings 2 Corp.)
• Original Assignee: Truck-Lite Company Incorporated (Truck-Lite)
• Inventors: Roller, Philip C.
• Primary Examiner(s): Epps, Georgia
• Assistant Examiner(s): THOMPSON, TIMOTHY J
• Application Number:
  US09/482,669
• Time in Patent Office: 901 Days
• Field of Search: 359/726, 359/727, 359/729, 362/800, 362/268, 362/237, 362/240, 362/244
• US Class Current: 359/726
• CPC Class Codes: B60Q 1/0052 concentric
• CPC Class Codes: B60Q 1/0058 Stacked, i.e. one lamp located behind the other in the optical axis direction
• CPC Class Codes: F21S 43/14 Light emitting diodes [LED]
• CPC Class Codes: F21S 43/26 Refractors, transparent cover plates, light guides or filters not provided in groups F21S43/235 - F21S43/255
• CPC Class Codes: F21S 43/31 Optical layout thereof
• CPC Class Codes: F21S 43/40 characterised by the combination of reflectors and refractors
• CPC Class Codes: F21S 45/47 Passive cooling, e.g. using fins, thermal conductive elements or openings
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 7/0025 Combination of two or more reflectors for a single light source array of reflectors for a cluster of light sources F21V7/0083
• CPC Class Codes: F21Y 2107/60 on stacked substrates
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

The subject invention describes a light assembly using light emitting diodes (LEDs) especially suited for use as a daytime running lamp. The catadioptric light assembly comprises a circuit board, a first set of LEDs secured to a first board, a first collimator disposed in front of the first set of LEDs for directing resultant parallel light beams to a reflective surface. The light beams are reflected by the reflective surface to an inner reflective surface of a housing and are directed, in a parallel fashion, to a lens. A second collimator is disposed in from of the second set of LEDs for directing the resultant parallel light beams directly to the lens. First and second support members, connected to the first and second boards, respectively, absorb and dissipate the heat generated by the LEDs.

Claims

1. A light assembly comprising:

a circuit board;

a first support member housing the circuit board;

a first board having a first plurality of light emitting diodes embedded thereon and operatively connected to the circuit board;

said first board being disposed within said first support member;

a first collimator having a first plurality of light directing elements;

said first collimator being mounted on the first board such that the light emitted from said first plurality of light emitting diodes passes through the first plurality of light directing elements;

a second support member having a reflective surface;

said reflective surface operatively arranged to reflect light emitted from the first collimator;

a connecting member joining the first support member to the second support member in a fixed spatial relationship;

a second board having a second plurality of light emitting diodes embedded thereon and operatively connected to the circuit board;

said second board being disposed within said second support member; and

,

a second collimator having a second plurality of light directing elements;

said second collimator being mounted on the second board such that the light emitted from said second plurality of light emitting diodes passes through the second plurality of light directing elements.

2. A light assembly according to claim 1, further comprising:

a housing having a first opening and a second opening;

said first opening adapted to receive and mount to said first support member such that said light emitting diodes are directed at said second opening; and

,

a lens adapted to fit within and cover said second opening.

3. A light assembly according to claim 1 wherein said first and second support members are heat sinks, removing heat generated from said first plurality of light emitting diodes and said second plurality of light emitting diodes, respectively.

4. A light assembly according to claim 1 wherein said connecting member is a pillar.

5. A light assembly according to claim 4 wherein said pillar having a length and possessing a groove along said length.

6. A light assembly according to claim 1 wherein said connecting member is a plurality of transparent rings arranged in a stack.

7. A light assembly according to claim 1 wherein said reflective surface possesses optics to diffuse and direct the light emitted from said first plurality of light emitting diodes.

8. A light assembly according to claim 2 wherein said lens possesses pillow optics to distribute and diffuse light emitted from the first plurality of light emitting diodes and the second plurality of light emitting diodes;

and,

wherein said housing possesses an inner surface;

said inner surface constructed of a reflective material and operatively arranged to reflect light received from the first plurality of light emitting diodes and said second plurality of light emitting diodes.

9. A light assembly according to claim 1 wherein said first plurality of light directing elements and said second plurality of light directing elements possesses optics such that the light emitted from the first plurality of light emitting diodes and the second plurality of light emitting diodes is distributed and diffused.

10. A light assembly according to claim 2 for use as a daytime running lamp of a vehicle wherein the light emitted from said assembly possesses a minimum candela power at the center point of the assembly of 500 and a maximum candela power of 3000 at any location;

said assembly providing a minimum unobstructed effective projected luminous lens area of 40 cm² and an unobstructed view of the outer lens surface area of 10 cm² as measured at 45 degrees to the longitudinal axis of the vehicle.

11. A light assembly according to claim 2 for use as a stop or turn signal lamp of a vehicle wherein the light emitted from said assembly possesses a minimum luminous intensity at the center point of the assembly of 200;

said assembly providing an effective projected luminous lighted area of 75 cm².

12. A light assembly according to claim 2 for use as a parking lamp of a vehicle wherein the light emitted from said assembly possesses a minimum luminous intensity at the center point of the assembly of 16.8;

said assembly providing an unobstructed projected area of 13 cm².

13. A light assembly comprising:

a circuit board;

a first support member housing the circuit board;

a first board having a first plurality of light emitting diodes embedded thereon and operatively connected to the circuit board;

said first board being disposed within said first support member;

a first collimator having a first plurality of light directing elements;

said first collimator being mounted on the first board such that the light emitted from said first plurality of light emitting diodes passes through the first plurality of light directing elements;

a second support member having a reflective surface;

said reflective surface operatively arranged to reflect light emitted from the first collimator;

a second board having a second plurality of light emitting diodes embedded thereon and operatively connected to the circuit board;

said second board being disposed within said second support member;

a second collimator having a second plurality of light directing elements;

said second collimator being mounted on the second board such that the light emitted from said second plurality of light emitting diodes passes through the second plurality of light directing elements;

a housing having a first opening and a second opening;

said first opening adapted to receive and mount to said first support member such that said light emitting diodes are directed at said second opening; and

,

a lens adapted to fit within and cover said second opening, said lens having an inner surface;

an attachment member connected to the second support member and the inner surface of the lens.

14. A light assembly according to claim 13 wherein said first and second support members are heat sinks, removing heat generated from said first plurality of light emitting diodes and said second plurality of light emitting diodes, respectively.

15. A light assembly according to claim 13 wherein:

said lens possesses pillow optics to distribute and diffuse light emitted from the first plurality of light emitting diodes and the second plurality of light emitting diodes;

said reflective surface possesses optics to diffuse and direct the light emitted from said first plurality of light emitting diodes;

said attachment member is made of a transparent material; and

,

said housing possesses an inner surface;

said inner surface constructed of a reflective material and operatively arranged to reflect light received from the first plurality of light emitting diodes and said second plurality of light emitting diodes.

16. A light assembly according to claim 13 wherein said first plurality of light directing elements and said second plurality of light directing elements possesses optics such that the light emitted from the first plurality of light emitting diodes and the second plurality of light emitting diodes is distributed and diffused.

17. A light assembly according to claim 13 for use as a daytime running lamp of a vehicle wherein the light emitted from said assembly possesses a minimum candela power at the center point of the assembly of 500 and a maximum candela power of 3000 at any location;

said assembly providing a minimum unobstructed effective projected luminous lens area of 40 cm² and an unobstructed view of the outer lens surface area of 10 cm² as measured at 45 degrees to the longitudinal axis of the vehicle.

18. A light assembly according to claim 13 for use as a stop or turn signal lamp of a vehicle wherein the light emitted from said assembly possesses a minimum luminous intensity at the center point of the assembly of 200;

said assembly providing an effective projected luminous lighted area of 75 cm².

19. A light assembly according to claim 13 for use as a parking lamp of a vehicle wherein the light emitted from said assembly possesses a minimum luminous intensity at the center point of the assembly of 16.8;

said assembly providing an unobstructed projected area of 13 cm².

20. A light assembly comprising:

a circuit board;

a support member housing said circuit board;

a board having a plurality of light emitting diodes embedded thereon and operatively connected to said circuit board, said board being disposed within said support member;

a collimator having a plurality of light directing elements, said collimator being mounted on said board such that light emitted from said plurality of light emitting diodes passes through said plurality of light directing elements;

a first reflective member, said first reflective member operatively arranged to reflect said light emitted from said collimator;

a second reflective member operatively arranged to reflect said light reflected from said first reflective member; and

,

a lens adapted to transmit said light reflected from said second reflective member.