Patent ID: 6169366
Filing Date: 2001-01-02
Classification: H01J

Abstract:
A high pressure discharge lamp comprising: a vessel made of a non-conductive material which forms an inner space filled with an ionizable light-emitting material and a starting gas, and has opening portions at both ends thereof; and a composite electrode having a substantially cylindrical current conductor with a diameter which is substantially same as a diameter of the opening portion at one end of the vessel, and an electrode electrically connected to the current conductor; said current conductor of the composite electrode being formed by a substantially cylindrical member which is made of a non-conductive material and is coated with a mixture of a metal and a non-conductive material over substantially all of a cylindrical surface thereof; said metal of the mixture containing not less than 50 vol. % of molybdenum, and said non-conductive material of the mixture containing not less than 50 vol. % of a material which is the same as that forming said vessel; andsaid vessel and said composite electrode having been subjected to a co-firing into an integrated body, with the composite electrode inserted into the opening portion at one end of the vessel so that the electrode is exposed to the inner surface with one end of the composite electrode is exposed to outside of the vessel.