Patent ID: 7111962

Claim:
A light source, comprising: a light-emitting tube having a light-emitting portion that emits a light beam by an electric discharge between electrodes and sealing portions provided on both sides of the light-emitting portion; a reflector that reflects the light beam emitted by the light-emitting portion forward after aligning in a predetermined direction; a cover covering a light-irradiation opening of the reflector, the cover having an opening for irradiating the light beam reflected by the reflector and a heat-radiation fin formed on the outside thereof, the cover being made of a heat-conductive material that absorbs a heat generated by the light-emitting tube and conducts the absorbed heat to the heat-radiation fin; and a transparent member that covers the opening of the cover, the transparent member sealing an inside of the light source defined by the reflector, the cover and the transparent member.