Patent ID: 7654708

Claim:
A light source device comprising: a lamp unit comprising a lamp and a reflection mirror that reflects a light from said lamp and emits said light, said reflection mirror having at least one ventilation opening; a lamp cartridge that houses said lamp unit, said lamp cartridge having at least one ventilation opening, one of said lamp cartridge and said lamp unit having a transparent plate disposed on a light emitting side of said reflection mirror, wherein said lamp cartridge has at least one ventilation opening which is an outlet ventilation opening formed on a front wall of said lamp cartridge, said front wall being disposed on the light emitting side of said reflection mirror, said outlet ventilation opening directly opening to the outside of said light source device, and another ventilation opening which is an inlet ventilation opening on a rear side of said lamp cartridge with respect to said reflection mirror, so that air flows from said inlet ventilation opening on said rear side, toward said front wall along a back surface of said reflection mirror, and out of said outlet ventilation opening, and where a fragment-passage prevention member is provided on at least one of said ventilation openings of said lamp cartridge, and said fragment-passage prevention member allows the passage of the air, but prevents the passage of fragments of said lamp.