Spectral filtering of phosphor color wheels

摘要

A projection light source has a source of laser light of a first color. A first member has first and second phosphor material segments respectively configured to emit light of second and third colors when illuminated by the laser light of the first color. A second member has first and second dichroic filter segments respectively configured to pass the light of the second and third colors emitted by the first and second phosphor material segments, while blocking light of the others of the first, second and third colors. Relative placements of the first and second members are synchronized to periodically align the first member with the laser light source and the second member with the first member, so that the first dichroic filter segment will pass the second color along a path at first time intervals when the second color is emitted by the first phosphor material and the second dichroic filter segment will pass the third color along at least a same portion of the path at second time intervals when the third color is emitted by the second phosphor material.

主权项

1. A projection light source, comprising: a source of laser light of a first color; a first member including first and second phosphor material segments respectively configured to emit light of second and third colors when illuminated by the laser light of the first color and direct the emitted light to a path; a second member including first and second dichroic filter segments respectively configured to pass the light of the second and third colors emitted by the first and second phosphor material segments, while blocking light of the others of the first, second and third colors; a single mirror positioned between the first member and the second member along the path, the mirror configured to reflect the laser light of the first color from the source to the first member and to reflect the light of the first color from the first member to the second member, and the single mirror configured to transmit the emitted light of the second and third colors to the second member; and apparatus for synchronizing relative placements of the first and second members, to periodically align the first member with the laser light source and the second member with the first member, so that the first dichroic filter segment will pass the second color along the path at first time intervals when the second color is emitted by the first phosphor material and the second dichroic filter segment will pass the third color along at least a same portion of the path at second time intervals when the third color is emitted by the second phosphor material.