High-pressure vapour-discharge lamp

Application Number: 00108975
Application Date: 2000.05.24
Publication Number: 1274944
Publication Date: 2000.11.29
Priority Information: 1999/5/24 JP 143392/99
International: H01J61/073;H01J61/82
Applicant(s) Name: Matsushita Electric Corp.
Inventor(s) Name: Nishiura Yoshiharu;Yamamoto Takauta;Taketa Kazuo
Patent Agency Code: 72001
Patent Agent: jiang fuhou
Abstract A discharge tube (1) is provided inside an outer tube (2). At least a pair of electrodes (8) is arranged inside the discharge tube (1), and at least mercury is sealed into the discharge tube (1). The electrode (8) includes an electrode pin (12) and a metal pipe (13). Because a contact area of the electrode pin (12) and the inner surface of the metal pipe (13) is sufficiently maintained in a stable manner, a tip temperature of the electrode pin can be lowered sufficiently without a variation. As a result, it is possible to obtain a high pressure discharge lamp that has excellent lifetime characteristics and can considerably reduce the variation of the lifetime characteristics between lamps.