Optical assembly for LED chip package

• US 20040032728A1
• Filed: 08/07/2003
• Published: 02/19/2004
• Est. Priority Date: 08/19/2002
• Status: Abandoned Application

• Current Assignee: Dr Robert Galli
• Original Assignee: Dr Robert Galli
• Inventors: Galli, Robert
• Application Number:
  US10/636,465
• Publication Number:
  US 20040032728A1
• Time in Patent Office: Days
• US Class Current: 362/84
• CPC Class Codes: F21S 41/141 Light emitting diodes [LED]
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 33/60 Reflective elements

Abstract

An assembly is disclosed that provides for the installation of an inverted reflector cup over the optical dome of a light emitting diode (LED) package wherein the reflector has a single controlled output opening through which the output of the LED is focused. The reflector assembly is designed to completely cover the light output end of the LED package in order to capture all of the light being emitted from the LED chip. The interior surface of the reflector is curved to redirect as much of the emitted light toward the front of the optical package as possible. The present invention is particularly suited for use a variety of lighting devices including but not limited to flashlights, specialty architectural grade lighting fixtures and vehicle lighting.

Claims

1. A lighting assembly comprising:

a light emitting diode having an optical axis; and

an inverted reflector assembled in overlying relation with said light emitting diode, said reflector including a body having a reflective surface, said reflective surface having an optical axis, said body further having an aperture aligned with said optical axis of said reflective surface;

wherein said optical axis of said reflective surface is aligned with said optical axis of said light emitting diode, said reflector being aligned and configured to direct light output from said light emitting diode back onto said light emitting diode, said aperture allowing light output that is substantially aligned with said optical axis of said reflective surface to exit said assembly.

2. The lighting assembly of claim 1, said light emitting diode including an optical housing, said housing having an outer surface, said reflective surface being configured to substantially match the shape of said outer surface of said housing.

3. The lighting assembly of claim 2, wherein said outer surface of said housing and said reflective surface are parabolic.

4. The lighting assembly of claim 2, wherein said outer surface of said housing and said reflective surface are ellipsoidal.

5. The lighting assembly of claim 2, wherein said outer surface of said housing and said reflective surface are spherical.

6. The lighting assembly of claim 1, said light emitting diode further comprising:

an emitter die, said emitter having a light output at a first wavelength; and

a phosphor coating on said emitter die, said phosphor energized by said light output at said first wavelength, said phosphor having a light output at a second wavelength complementary to said first wavelength, said first and second wavelengths cooperating to form substantially white light output in the visible range.

7. The lighting assembly of claim 6, wherein said phosphor coating is a mixture of red, green and blue phosphors.

8. The lighting assembly of claim 6, wherein said first wavelength substantially corresponds to blue in the visible light spectrum and said second wavelength substantially corresponds to yellow in the visible light spectrum.

9. The lighting assembly of claim 6, wherein said reflective surface includes a coating thereon, wherein the color of said coating is selected to reflect light at a third wavelength that is complementary to the color of said phosphor, said first, second and third wavelengths cooperating to form substantially white light output in the visible range.

10. The lighting assembly of claim 8, wherein said reflective surface includes a coating thereon, wherein the color of said coating is selected to reflect light at a third wavelength that is complementary to the color of said phosphor, said first, second and third wavelengths cooperating to form substantially white light output in the visible range.

11. The lighting assembly of claim 1, said light emitting diode further comprising:

an emitter die, said emitter having a light output at a first wavelength; and

a coating on said reflective surface, wherein the color of said coating is selected to reflect light at a second wavelength that is substantially matched to said first wavelength, said first and second wavelengths cooperating to form light output in a narrowly selected wavelength range in the visible spectrum.

12. A lighting assembly comprising:

a light emitting diode having an emitter chip and an optical housing, said optical housing having an optical axis and an outer surface, said emitter chip having a first portion of light output substantially aligned with said optical axis of said housing and a second portion of light output that is not substantially aligned with said optical axis of said housing; and

an inverted reflector assembled in overlying relation with said light emitting diode, said reflector including a body having a reflective surface, said reflective surface having an optical axis, an apex and a focal point, said reflective surface being configured to substantially match the shape of said outer surface of said housing, said body further having an aperture aligned with said optical axis of said reflective surface at said apex of said reflective surface;

wherein said optical axis of said reflective surface is aligned with said optical axis of said optical housing, said focal point of said reflective surface being aligned and configured to direct said second portion of the light output from said emitter chip back onto said emitter chip, said aperture allowing said first portion of the light output from said emitter chip to exit said assembly.

13. The lighting assembly of claim 12, wherein said outer surface of said housing and said reflective surface are parabolic.

14. The lighting assembly of claim 12, wherein said outer surface of said housing and said reflective surface are ellipsoidal.

15. The lighting assembly of claim 12, wherein said outer surface of said housing and said reflective surface are spherical.

16. The lighting assembly of claim 12, wherein said emitter die has a light output at a first wavelength, and further includes a phosphor coating on said emitter die, said phosphor energized by said light output at said first wavelength, said phosphor having a light output at a second wavelength complementary to said first wavelength, said first and second wavelengths cooperating to form substantially white light output in the visible range.

17. The lighting assembly of claim 16, wherein said reflective surface includes a coating thereon, wherein the color of said coating is selected to reflect light at a third wavelength that is complementary to the color of said phosphor, said first, second and third wavelengths cooperating to form substantially white light output in the visible range.

18. The lighting assembly of claim 12, wherein said emitter die has a light output at a first wavelength, and said reflective surface includes a coating thereon, wherein the color of said coating is selected to reflect light at a second wavelength that is substantially matched to said first wavelength, said first and second wavelengths cooperating to form light output in a narrowly selected wavelength range in the visible spectrum.

19. A light emitting diode comprising:

a body;

an emitter die mounted onto said body;

an optical housing disposed over said emitter die, said optical housing having an optical axis and an outer surface; and

a reflective coating covering substantially all of said outer surface of said optical housing, said reflective coating having an aperture therein, said aperture being substantially aligned with said optical axis of said housing.

20. The light emitting diode of claim 19, wherein said reflective coating is configured to direct light output from said light emitting diode back onto said emitter die, said aperture allowing light output that is substantially aligned with said optical axis of said optical housing to exit said light emitting diode.

21. The light emitting diode of claim 20, wherein said outer surface of said housing and said reflective coating are parabolic.

22. The light emitting diode of claim 20, wherein said outer surface of said housing and said reflective coating are ellipsoidal.

23. The light emitting diode of claim 20, wherein said outer surface of said housing and said reflective coating are spherical.

24. The light emitting diode of claim 19, said emitter die having a light output at a first wavelength, said emitter further including a phosphor coating thereon, said phosphor energized by said light output at said first wavelength, said phosphor having a light output at a second wavelength complementary to said first wavelength, said first and second wavelengths cooperating to form substantially white light output in the visible range.

25. The light emitting diode of claim 24, wherein said first wavelength substantially corresponds to blue in the visible light spectrum and said second wavelength substantially corresponds to yellow in the visible light spectrum.

26. The light emitting diode of claim 24, wherein said phosphor coating is a mixture of red, green and blue phosphors.

27. The light emitting diode of claim 24, wherein said reflective surface includes a coating thereon, wherein the color of said coating is selected to reflect light at a third wavelength that is complementary to the color of said phosphor, said first, second and third wavelengths cooperating to form substantially white light output in the visible range.

28. The light emitting diode of claim 20, said emitter having a light output at a first wavelength and said reflective coating having a color, wherein the color of said coating is selected to reflect light at a second wavelength that is substantially matched to said first wavelength, said first and second wavelengths cooperating to form light output in a narrowly selected wavelength range in the visible spectrum.