Signal light using phosphor coated LEDs

• US 8,432,029 B2
• Filed: 06/14/2011
• Issued: 04/30/2013
• Est. Priority Date: 12/30/2005
• Status: Active Grant

• Current Assignee: Dialight Corporation (Dialight PLC)
• Original Assignee: Dialight Corporation (Dialight PLC)
• Inventors: Curran, John W., Peck, John Patrick, Goldstein, Peter
• Primary Examiner(s): DANG, PHUC T
• Application Number:
  US13/160,235
• Publication Number:
  US 20110241034A1
• Time in Patent Office: 686 Days
• Field of Search: 257/678, 257/686, 257/693, 257/E25.031, 438/27, 438/28, 438/29, 438/30
• US Class Current: 257/686
• CPC Class Codes: F21V 3/00 Globes; Bowls; Cover glasses with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506
• CPC Class Codes: F21V 5/045 the lens having discontinuous faces, e.g. Fresnel lenses
• CPC Class Codes: F21V 9/08 for producing coloured light, e.g. monochromatic; for reducing intensity of light with provision for controlling the colour F21V9/40
• 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: F21W 2111/02 for roads, paths or the like
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2105/12 characterised by the geometrical disposition of the light-generating elements, e.g. arranging light-generating elements in differing patterns or densities
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/00 Circuit arrangements for operating light-emitting diodes [LED]
• CPC Class Codes: H05B 45/20 Controlling the colour of the light

Abstract

A method for creating an improved signal light is disclosed. For example, the improved signal light includes a housing, one or more first type of light emitting diodes (LEDs) emitting a light energy having a first dominant wavelength deployed in the housing, one or more second type of LEDs emitting a light energy having a second dominant wavelength deployed in the housing, a filter and a mixer. The filter may filter the light energy of the one or more second type of LEDs such that only a third dominant wavelength passes from the one or more second type of LEDs. The mixer may mix the light energy having the first dominant wavelength and the filtered light energy having the third dominant wavelength to form a light energy having a desired fourth dominant wavelength.

Claims

1. A light emitting diode (LED) light comprising:

a filter; and

at least one or more LEDs, wherein the at least one or more LEDs achieve a perceived color via a blue LED that is coated with a yellow phosphor, wherein a light of the at least one or more LEDs is filtered by the filter such that a blue light is absorbed and a yellow light passes.

2. The LED light of claim 1, wherein the perceived color is yellow.

3. The LED light of claim 1, wherein the perceived color is red.

4. The LED light of claim 1, wherein the perceived color is orange-yellow.

5. The LED light of claim 2, wherein the at least one or more LEDs are made of Indium Gallium Nitride (InGaN).

6. The LED light of claim 3, wherein the at least one or more LEDs are made of Indium Gallium Nitride (InGaN).

7. The LED light of claim 4, wherein the at least one or more LEDs are made of Indium Gallium Nitride (InGaN).

8. The LED light of claim 1, wherein the at least one or more LEDs are placed in a reflector.

9. The LED light of claim 1, wherein the filter is located between the at least one or more LEDs and at least one outer lens.

10. The LED light of claim 1, wherein the filter is located directly on each one of the at least one or more LEDs.

11. The LED light of claim 1, wherein the filter is a colored filter or a dichroic filter.

12. The LED light of claim 1, wherein the filter is deployed in a Fresnel lens.

13. The LED light of claim 1, wherein a desired light energy of the at least one or more LEDs comprises x and y coordinates in accordance with a 1931 CIE Chromaticity Diagram within the boundaries of:

14. A method of creating a light emitting diode (LED) light comprising:

providing a filter; and

providing at least one or more LEDs, wherein the at least one or more LEDs achieve a perceived color via a blue LED that is coated with a yellow phosphor, wherein a light of the at least one or more LEDs is filtered by the filter such that a blue light is absorbed and a yellow light passes.

15. A signal light comprising:

a housing;

a filter in the housing;

at least one outer lens coupled to the housing; and

at least one or more light emitting diodes (LEDs) deployed in the housing,

wherein the at least one or more LEDs have a perceived color via a blue LED that is coated with a yellow phosphor, wherein a light of the at least one or more LEDs is filtered by the filter such that a blue light is absorbed and a yellow light passes.

16. The signal light of claim 15, wherein the perceived color is yellow.

17. The signal light of claim 15, wherein the perceived color is red.

18. The signal light of claim 15, wherein the perceived color is orange-yellow.

19. The signal light of claim 16, wherein the at least one or more LEDs are made of Indium Gallium Nitride (InGaN).

20. The signal light of claim 17, wherein the at least one or more LEDs are made of Indium Gallium Nitride (InGaN).