Patent ID: 6215254
Filing Date: 2001-04-10
Classification: H01J

Abstract:
A high-voltage discharge lamp comprising:a light-transmitting ceramic discharge vessel having an internal volume of 0.05 cc or less and comprising a spherical, bulging section surrounding a discharge space and small diameter cylindrical sections continuously and integrally communicating with the ends of the spherical, bulging section; and having an inner diameter smaller than the spherical, bulging section;electrode-integrated power-supplying conductors, each comprising a seal part and a halide-resistant part having a proximal end connected to the distal end of the seal part and each inserted in one small diameter cylindrical section of the light-transmitting ceramic discharge vessel without a solid material between said each halide-resistant part and said one small diameter cylindrical section and, said halide-resistant part penetrating the spherical, bulging section of the light-transmitting ceramic discharge vessel, forming a narrow gap between the halide-resistant part and the inner surface of the small diameter cylindrical section, and each having a distal end projecting into the spherical, bulging section of the light-transmitting ceramic discharge vessel and forming an electrode part;seals made of ceramic-sealing compound, each sealing a junction between one small diameter cylindrical section of the light-transmitting ceramic discharge vessel and one electrode-integrated power-supplying conductor;a discharge medium containing a metallic halide and filled in the light-transmitting ceramic discharge vessel; andsaid spherical, bulging section having a ratio R.sub.D of the minor diameter to the major diameter, wherein the following formula is satisfied:0.3.ltoreq.R.sub.D.ltoreq.1.0.