Patent ID: 9470886
Filing Date: 2016-10-18
CPC Classification: F21V,G02B,G03B

Claim Text:
1. An apparatus for generating blue color illumination for use in a projection system, comprising: a blue laser light source; a color wheel having segments of respective different color light emitting phosphors formed over blue laser light non-transmitting portions and at least one blue color generating segment, the blue color generating segment having a blue laser light non-transmitting first portion, a blue laser light transmitting second portion disposed inwardly in a radial direction from the first portion, and cyan color light emitting phosphor over the first portion; a dichroic filter for reflecting the blue laser light from the light source onto the respective segments as the color wheel is rotated and for selectively transmitting the different color light and cyan color light emitted back from the color wheel along a projection optical path, the light source, color wheel and filter being relatively dimensioned and configured for reflecting the blue laser light from the light source simultaneously onto the first and second portions of the blue light generating segment for an entire duration of traversal of the blue color generating segment in front of the light source; and a wraparound optical path for directing blue laser light transmitted through the light transmitting second portion back to the dichroic filter for reflection along the projection optical path.