Low-pressure discharge lamp with filament having protective coat

Details Low-pressure discharge lamp with filament having protective coat Low-pressure discharge lamp with filament having protective coat

1998-10-16

2000-10-24

Patel, Vip

Electric lamp and discharge devices

With gas or vapor

Incandescent filament lamp

313631, H01K 126

Patent

active

061372250

ABSTRACT:
At least one of the electrodes (6a) has a coil (60a) of a refractory metal which is electrically connected to current supply conductors (7a, 7a') which extend to outside the discharge vessel. The coil (60a) has a central portion (61a) which is coated with an electron-emitting material and an end portion (62a, 62a) on either side thereof, which end portions are covered with a protecting material which is mainly formed by one or more oxides of calcium and/or magnesium.

REFERENCES:
patent: 5233268 (1993-08-01), Heuvelmans et al.
patent: 6049164 (2000-04-01), Kemenade et al.

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