Electric lamp and discharge devices – With gas or vapor – Having a particular total or partial pressure
Patent
1985-11-19
1987-06-16
DeMeo, Palmer C.
Electric lamp and discharge devices
With gas or vapor
Having a particular total or partial pressure
313623, 313635, 313318, H01J 6112, H01J 6135, H01J 6136
Patent
active
046738436
ABSTRACT:
An electrically-conductive member is provided on the outer wall of a cathode-sealing portion of a dc discharge lamp such as a super high pressure mercury vapor lamp, and the electrically-conductive member is electrically connected to a sealed cathodic conductor which is contained in the cathode-sealing portion and connected to its cathode rod. The electric potential of the electrically-conductive member is thus kept equal to that of the sealed cathodic conductor while the dc discharge lamp is in operation. As a result, the air-tight connection between the sealed cathodic conductor and the quartz glass of the cathode-sealing portion is maintained stably over a long period of time. Such a dc discharge lamp assures long service life and high reliability.
REFERENCES:
patent: 2177714 (1939-10-01), Hagen et al.
patent: 2467687 (1949-04-01), Noel
patent: 4190786 (1980-02-01), Kira
DeMeo Palmer C.
Ushio Denki Kabushiki Kaisha
Ziems Robert F.
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