Patent ID: 8231227

Claim:
A light source unit comprising: three light emitting devices in which light emitting diodes or laser oscillators are used as light sources thereof, wherein the three light emitting devices include: (i) a light emitting device in which a fluorescent material layer is disposed on a rotary member which emits light of red wavelength area, (ii) a light emitting device in which a fluorescent material layer is disposed on a rotary member which emits light of green wavelength area, and (iii) a light emitting device in which a fluorescent material layer is disposed on a rotary member which emits light of blue wavelength area; and an optical axis varying device for varying directions of optical axes of respective light beams emitted from the light emitting devices so as to coincide with one another; wherein at least one of the three light emitting devices comprises: the light source; the rotary member on which the fluorescent material layer is disposed which emits the light of its respective wavelength area by receiving light that is shined thereto from the light source; a drive source for rotating the rotary member; means for measuring a temperature of the rotary member; and means for variably controlling a rotational speed of the rotary member so as to maintain a temperature of the rotary member to a predetermined value based on measured temperature information.