Low-pressure discharge lamp having metal and ceramic electrodes

Details Low-pressure discharge lamp having metal and ceramic electrodes Low-pressure discharge lamp having metal and ceramic electrodes

1995-11-06

1997-08-05

Patel, Ashok

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313574, 313623, 313631, 313633, 313346R, 313630, H01J 61067

Patent

active

056546068

ABSTRACT:
A low-pressure discharge lamp according to the invention is provided with a radiation-transmitting discharge vessel which encloses a discharge space containing an ionizable filling in a gastight manner, and electrodes arranged in the discharge space between which a discharge path extends. At least one of the electrodes is a sintered mixture of metal and ceramic material, the proportional quantity of metal in the mixture being small compared with the proportional quantity of ceramic material. The sintered mixture includes smaller ceramic particles with a modal diameter D1 and larger ceramic particles with a modal diameter D2, the ratio D2/D1 being at least 3, while the proportional volume of the smaller ceramic particles is small compared with that of the larger ceramic particles. In the lamp according to the invention, the electrodes have a comparatively high resistance to temperature variations in spite of the small proportional volume of metal particles.

REFERENCES:
patent: 2847605 (1958-08-01), Byer
patent: 2888592 (1959-05-01), Laffrty
patent: 3101426 (1963-08-01), Takayama et al.
patent: 3505553 (1970-04-01), Piree
patent: 3563797 (1971-02-01), Young et al.
patent: 3798492 (1974-03-01), Menelly
patent: 4574219 (1986-03-01), Davenport et al.
patent: 5138224 (1992-08-01), Goldburt et al.

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