Ultra-high pressure discharge lamp unit and light source apparatus

Abstract

An ultra-high pressure discharge lamp unit is provided which satisfies both of the demand for enhanced brightness and the demand for prolonged lifetime. The ultra-high pressure discharge lamp unit includes: a reflector having a concave reflective surface; an ultra-high pressure discharge lamp; and a translucent cover, the reflector having sidewall defining an exhaust vent hole opening into an air passage defined to extend along an external surface of the reflector. When air flows through the air passage, a flow rate difference results between the exterior and the interior of the reflector and, hence, the pressure exerted on the exterior along which air flows at a higher flow rate becomes lower than that exerted on the interior. Accordingly, heated air within the reflector is discharged out of the reflector through the exhaust vent hole by suction caused by the relatively low pressure.

Dependencies are inferred from the claim text.