Patent ID: 6713962
Filing Date: 2004-03-30
Classification: H01J

Abstract:
A high-pressure discharge lamp, comprising:an arc tube that is made up of a main-tube part in which a discharge space is formed, and two thin-tube parts extending from both ends of the main-tube part, the main-tube part and the two thin-tube parts being made from a translucent ceramic material; and a pair of electrodes having rods that respectively extend through the two thin-tube parts into the discharge space so that tops thereof face each other with a predetermined distance in-between, the rod of at least one of the electrodes being held by a tubular electrode holder embedded in and bonded to the thin-tube part via an adhesive agent, the electrode holder being made of a halide-resistant metal, the adhesive agent including a sintered halide-resistant metal impregnated with mixture glass, wherein the electrode holder is at such a position that satisfies the expression L&gE;0.012P+2.5[mm]where â€œLâ€  is a distance [mm] between (a) a top of the electrode whose rod is held by the electrode holder and (b) one end of the electrode holder closer to the discharge space, and â€œPâ€  is a lamp wattage [W].