Patent ID: 9435996
Filing Date: 2016-09-06
CPC Classification: F21V,G02B,G03B

Claim Text:
1. An illumination optical system for a beam projector, comprising: at least one light source for generating a light; a color conversion unit having at least one fluorescent substance layer that reflects light emitted from the at least one light source or converts a wavelength of the light emitted from the at least one light source to a wavelength-converted light, the at least one fluorescent substance layer comprising: at least one dichroic mirror disposed at a predetermined angle for deflecting the light emitted from the at least one light source to be incident on the color conversion unit, the at least one dichroic mirror comprising: a first reflective area for reflecting the blue laser light to be incident on the color conversion unit; a second reflective area formed around the first reflective area for reflecting a blue laser light to be incident on the color conversion unit; and a transmissive area formed between the first reflective area and the second reflective area, wherein the green and red lights emitted by the fluorescent substance layer are transmitted through the first and second reflective areas and the transmissive area, and the blue light reflected by a reflective layer of the color conversion unit is transmitted through the transmissive area, wherein the reflected light or the wavelength-converted light by the conversion unit are incident on a display panel through a same path.