Patent ID: 6307321
Filing Date: 2001-10-23
Classification: H01J

Abstract:
A high-pressure discharge lamp characterized by comprising:a light-transmitting ceramic discharge vessel having an internal volume of 0.1 cc or less and including a bulging section and small-diameter cylindrical sections communicating with both ends of the bulging section, said bulging section having both ends narrowed by a continuous curved surface, and said small-diameter cylindrical sections having an inner diameter smaller than the bulging section;power-supplying conductors each including a seal part and a halide-resistant section having a proximal end connected to a distal end of the seal part and inserted respectively in the small-diameter cylindrical sections of the light-transmitting ceramic discharge vessel, each of the halide-resistant sections forming a slight gap to the inner surface of the small-diameter cylindrical section;a pair of electrodes respectively arranged at the distal ends of one halide-resistant parts and located in the bulging section of the light-transmitting ceramic discharge vessel, with a distance d1 of 1.0 mm or above maintained between each of distal ends of the electrodes and the inner surface of the light-transmitting ceramic discharge vessel on a plane perpendicular to an axis of the light-transmitting ceramic discharge vessel including the distal ends of the electrodes;seals made of ceramic-sealing compound respectively making sealing between the small-diameter cylindrical sections of the light-transmitting ceramic discharge vessel and the seal parts of the power-supplying conductors; anda discharge medium containing metallic halide and filled in the light-transmitting ceramic discharge vessel.