Patent ID: 8348435

Claim:
A light source unit comprising: an excitation light shining device for emitting excitation light; a luminescent plate having a luminescent light emitting area on a base material and adapted to emit a luminescent light ray of a predetermined wavelength band by the excitation light being shone onto the luminescent light emitting area from the excitation shining device; two types of light source devices for emitting light rays of wavelength bands which are different from the wavelength band of the luminescent light ray emitted from the luminescent plate; a light guiding optical system for guiding individually the luminescent light ray emitted from the luminescent plate and the light rays emitted from the two types of light sources to a predetermined plane; and a light source control device for controlling individually the emission of light from the excitation light shining device and the two types of light source devices; wherein: the luminescent plate is a luminescent wheel having the base material, which is driven to rotate by a wheel motor; the luminescent light emitting area is annularly disposed along a whole periphery of the luminescent plate; a reflecting surface which reflects light is formed in the luminescent light emitting area, and a luminescent material layer which receives the excitation light to emit the luminescent light ray is formed on the reflecting surface; and a synthetic light ray or a single-color light ray is emitted by controlling individually the emission of light from the excitation light shining device and the two types of light sources by the light source control device.