Patent ID: 8733945

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 of a single color by the excitation light being shone onto the luminescent light emitting area from the excitation shining device; a light source device for emitting a light ray of a wavelength band which is different from the wavelength band of the luminescent light ray emitted from the luminescent plate; and a light source control device for controlling individually the emission of light from the excitation light shining device and the light source device, wherein: the luminescent plate is a luminescent wheel comprising 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 and is adapted to emit the luminescent ray of the predetermined wavelength band of said single color from along the whole periphery of the luminescent plate, 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 light source device by the light source control device, and a reflecting surface for reflecting light is formed in the luminescent light emitting area, and a luminescent material layer for receiving the excitation light so as to emit the luminescent light ray of the predetermined wavelength band of said single color is formed on the reflecting surface.