Patent Number: 8,575,837

Title: High pressure discharge lamp

Abstract: A high pressure discharge lamp of the present invention is provided with a light-emitting bulb comprising a light-emitting part and sealing sections; metal foils embedded within the sealing sections; and a pair of electrodes having one end protruding into the light-emitting part and having the other end embedded in the corresponding sealing section and joined to the corresponding metal foil. An embedded length L (mm) of the electrodes that is defined by the length between a light-emitting part side end of the metal foil and the border section between the protruding section and the embedded section of the electrode, and the temperature T (.degree. C.) at the joint region of the electrode and the metal foil are set to satisfy 1.8.ltoreq.L.ltoreq.2.8 and T.ltoreq.970.

Inventors: Matsumoto; Yasuhisa (Gyoda, JP), Yoshizawa; Toshio (Gyoda, JP), Ohno; Atsushi (Gyoda, JP)

Assignee: Iwasaki Electric Co., Ltd.

International Classification: H01J 17/20 (20120101)

Expiration Date: 1/05/12017