Patent ID: 8354790

Claim:
A light source comprising: a light source unit comprising (i) a plurality of segment areas on a circular transparent base material which can be controlled to rotate, (ii) layers of different phosphors for emitting light of predetermined wavelength bands, respectively, by receiving excitation light, the layers being disposed on at least two of the segment areas of the transparent base material, and (iii) an excitation light source for shining excitation light within a visible light wavelength range onto the phosphors; and a light guiding unit which makes light emitted from the light source unit into a light beam whose intensity is uniformly distributed, wherein the light guiding unit has a rectangular opening into which the light emitted from the light source unit is incident; wherein an incident mask having a rectangular opening which corresponds in shape to the opening of the light guiding unit is disposed between the excitation light source and the circular transparent base material.