Patent ID: 7789532

Claim:
A light source device, including: a light source lamp that emits an illumination light; a rotary plate including a plurality of opening portions that are selectively disposed in a path of an illumination light of the light source lamp, in which a reflective filter that reflects a light of a wavelength that is a heat source in the illumination light is provided in one of the opening portions; a heat absorbing portion that absorbs heat which is included in a reflected light that is reflected by the reflective filter that is provided in an opening portion of the rotary plate; and a filter mounting member that, in a state in which the reflective filter is disposed in the illumination light path, causes the reflective filter to be disposed in the opening portion in an inclined condition at a predetermined angle with respect to an optical axis of the illumination light so that a reflected light that is reflected by the reflective filter is reflected towards the heat absorbing portion.