Illumination system with optical concentrator and wavelength converting element
First Claim
1. An apparatus comprising:
- a light emitting element;
an optical concentrator having an entrance surface and an exit surface, the entrance surface optically coupled to the light emitting element, the optical concentrator concentrating the light received at the entrance surface to the exit surface which is smaller than the entrance surface;
a wavelength converting material mounted on the exit surface of the optical concentrator, the wavelength converting material converting at least a portion of the light emitted by the light emitting element to a one or more wavelengths; and
a dichroic filter disposed between the light emitting element and the wavelength converting element, wherein the dichroic filter reflects light emitted by the wavelength converting element having the one or more wavelengths.
2 Assignments
0 Petitions
Accused Products
Abstract
A light emitting device includes a light emitting element, an optical concentrator, such as a compound parabolic concentrator, a dichroic filter between the light emitting element and the optical concentrator and a wavelength converting material, such as a phosphor. The optical concentrator receives light from the light emitting element, via the dichroic filter, and emits the light from an exit surface, which is smaller than the entrance surface. The optical concentrator may be manufactured from a material with a high refractive index, such as sapphire. The wavelength converting material is, e.g., disposed over the exit surface. The radiance of the wavelength converting material is increased by pumping the wavelength converting material through a high index of refraction material and outputting the converted light into a low refractive index medium, such as air.
-
Citations
36 Claims
-
1. An apparatus comprising:
-
a light emitting element;
an optical concentrator having an entrance surface and an exit surface, the entrance surface optically coupled to the light emitting element, the optical concentrator concentrating the light received at the entrance surface to the exit surface which is smaller than the entrance surface;
a wavelength converting material mounted on the exit surface of the optical concentrator, the wavelength converting material converting at least a portion of the light emitted by the light emitting element to a one or more wavelengths; and
a dichroic filter disposed between the light emitting element and the wavelength converting element, wherein the dichroic filter reflects light emitted by the wavelength converting element having the one or more wavelengths. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
-
-
26. A method comprising:
-
generating light having a first range of wavelengths;
transmitting the light through a dichroic filter;
concentrating the light; and
converting at least a portion of the concentrated light to converted light having a second range of wavelengths, wherein the dichroic filter transmits light having the first range of wavelengths and reflects light having the second range of wavelengths. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
-
Specification