Patent ID: 8303493

Claim:
A light source device comprising: a first light source which emits illumination light whose wavelength band covers a first wavelength band and a second wavelength band; a light condensing portion which is arranged on an optical axis of illumination light emitted from the first light source and condenses light; a rotating plate which has a first window portion that transmits illumination light in the first wavelength band and a second window portion that transmits at least illumination light in the second wavelength band and is rotatably arranged such that the first window portion and the second window portion pass through the optical axis of the illumination light; a driving control portion which controls rotation of the rotating plate; a second light source which emits illumination light in the first wavelength band toward the rotating plate; and an optical device which is arranged at the rotating plate, can transmit the illumination light emitted from the first light source, and can reflect the illumination light emitted from the second light source to the light condensing portion, wherein the optical device has a first dichroic filter and a second dichroic filter which are formed integrally with the first window portion, the first dichroic filter has a transmission characteristic of being able to transmit illumination light in the first wavelength band emitted from the first light source, and the second dichroic filter has a reflectance characteristic of reflecting illumination light emitted from the second light source to the light condensing portion.