Method of Light Dispersion and Preferential Scattering of Certain Wavelengths of Light-Emitting Diodes and Bulbs Constructed Therefrom

• US 20090200939A1
• Filed: 04/27/2007
• Published: 08/13/2009
• Est. Priority Date: 05/02/2006
• Status: Active Grant

• Current Assignee: Switch Bulb Company, Inc.
• Original Assignee: Superbulbs, Inc.
• Inventors: Lenk, Carol, Lenk, Ronald J.
• Granted Patent: US 8,193,702 B2
• Time in Patent Office: Days
• US Class Current: 313/512
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21K 9/60 Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
• CPC Class Codes: F21K 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: F21K 9/90 Methods of manufacture
• 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 3/063 comprising air or water bubbles, e.g. foamed materials
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A method for preferential scattering of certain wavelengths of light and/or dispersing light in an LED or LED bulb. The method includes emitting light from at least one LED die, and scattering the light from the at least one LED die by dispersing a plurality of particles having a size a fraction of at least one dominant wavelength of the light from the at least one LED die in the LED outer shell or in an LED bulb or in an at least one shell of an LED bulb. Alternatively, the method includes emitting light from the at least one LED die, and dispersing the light from the at least one LED die by distributing a plurality of particles having a size one to a few times larger than a dominant wavelength of the light from the LED in an outer shell, or body of the LED bulb.

Claims

1-16. -16. (canceled)

17. A method for preferential scattering of certain wavelengths of light in an LED, the method comprising:

emitting light from an LED die; and

scattering the light from the LED die by dispersing a plurality of particles having a size a fraction of at least one dominant wavelength of the light from the LED die in at least one outer shell of the LED.

18. The method of claim 17, wherein the plurality of particles are dispersed in the body of the LED.

19. The method of claim 17, wherein the scattering is Rayleigh scattering.

20. A method for preferential scattering of certain wavelengths of light in an LED bulb, the method comprising:

emitting light from at least one LED; and

scattering the light from the at least one LED by dispersing a plurality of particles having a size a fraction of at least one dominant wavelength of the light from the at least one LED in at least one outer shell of the LED bulb.

21. The method of claim 20, wherein the scattering is Rayleigh scattering.

22. A method for preferential scattering of certain wavelengths of light in an LED bulb, the method comprising:

emitting light from at least one LED; and

scattering the light from the at least one LED by dispersing a plurality of particles having a size a fraction of at least one dominant wavelength of the light from the at least one LED in the LED bulb.

23. The method of claim 22, wherein the scattering is Rayleigh scattering.

24. A method for dispersing light in an LED bulb, the method comprising:

emitting light from at least one LED; and

scattering the light from the at least one LED by distributing a plurality of particles having a size one to a few times larger than a dominant wavelength of the light from the at least one LED in the LED bulb.

25. The method of claim 24, wherein the scattering is Mie scattering.

26. A method for dispersing light in an LED bulb, the method comprising:

emitting light from at least one LED; and

scattering the light from the at least one LED by distributing a plurality of particles having a size one to a few times larger than a dominant wavelength of the light from the at least one LED in at least one shell of the LED bulb.

27. The method of claim 26, wherein the scattering is Mie scattering.

28. An LED, comprising:

an LED die;

at least one shell encapsulating or partially encapsulating the die and having a plurality of particles dispersed therein, and wherein the plurality of particles are such a size as to disperse, and/or preferentially scatter certain wavelengths of, the light emitted from the LED.

29. The LED of claim 28, wherein the plurality of particles include particles of such a size as to preferentially scatter the light emitted from the LED by Rayleigh scattering.

30. The LED of claim 28, wherein the plurality of particles include particles of such a size to disperse the light emitted from the LED by Mie scattering.

31. An LED bulb, comprising:

a bulb having a plurality of particles dispersed therein;

at least one LED; and

wherein said plurality of particles are of such a size as to disperse, and/or preferentially scatter certain wavelengths of, the light emitted from the at least one LED.

32. The LED bulb of claim 31, wherein the plurality of particles include particles of such a size to preferentially scatter certain wavelengths of, light emitted from the at least one LED by Rayleigh scattering.

33. The LED bulb of claim 31, wherein the plurality of particles include particles of such a size to disperse the light emitted from the at least one LED by Mie scattering.

34. The LED bulb of claim 31, wherein the at least one LED is contained within the bulb.

35. The LED bulb of claim 31, wherein the at least one LED is optically coupled to the bulb.

36. The LED bulb of claim 31, wherein the bulb further comprises at least one shell, and wherein the plurality of particles are dispersed within the at least one shell.