Ronald E English

US Patent:

20080079910, Apr 3, 2008

Filed:

Sep 27, 2007

Appl. No.:

11/862893

Inventors:

Todd S. Rutherford - Cincinnati OH, US
Dale R. Lutz - Maplewood MN, US
Roy A. Auerbach - Cincinnati OH, US
Ronald E. English - Cincinnati OH, US

International Classification:

G03B 21/14
F21V 9/16

US Classification:

353 84, 362 84

Abstract:

A projection system contains an illumination system having at least a first source of incoherent light capable of generating light in a first wavelength range. The illumination system also includes a body containing a fluorescent material that emits light in a second wavelength range, different from the first wavelength range, when illuminated by light in the first wavelength range. The system further includes at least a second fluorescent material that absorbs light in at least one of the first and second wavelength ranges, and emits light in a third wavelength range. The body has an extraction area, and at least some of the light in either the second or third wavelength ranges is internally reflected within the body to the extraction area. Light from the extraction area illuminates at least one image-forming device. Image light from the image-forming device is projected by a projection lens unit onto a screen.