Patent ID: 6661176
Filing Date: 2003-12-09
Classification: H01J,H05B,Y02B

Abstract:
A high pressure discharge lamp, comprising:a light-transmissive ceramic discharge vessel with an envelope having a maximum outer diameter D1 and open ends; a metal pipe disposed in each of the open ends, respectively, each metal pipe having a first end located in a corresponding one of the open ends of the light-transmissive ceramic discharge vessel and a second end protruding from the light-transmissive ceramic discharge vessel; a plurality of electrodes each having a first end connected to a corresponding metal pipe and a second end extending within the light-transmissive ceramic discharge vessel; and a discharge agent which is filled in the light-transmissive ceramic discharge vessel, wherein the high pressure discharge lamp has an overall length L1, and the overall length L1 and the maximum outer diameter of D1 satisfy an equation: 1.5 &lE;L1/D1&lE;4.5.