Fluorescent lamp with opposing inversere cone electrodes

Details Fluorescent lamp with opposing inversere cone electrodes Fluorescent lamp with opposing inversere cone electrodes

1978-02-28

1978-09-26

Smith, Alfred E.

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Plural cathodes or heaters in the load device

313493, 313186, 313212, 313217, 313339, 313356, 313220, H01J 116, H01J 6109

Patent

active

041173740

ABSTRACT:
Electrodes for high current electric discharges in low pressure gases comprise a heated filament, coated with emissive material and surrounded by a hollow emitting surface in the shape of a truncated cone. The electric discharge initially starts from a spot on the filament and transfers to a diffuse mode at the small end of the cone structure.
High current fluorescent lamps which include the electrodes of the present invention are characterized by rapid transition from the spot mode to the diffuse mode discharge and by low cathode fall voltage.

REFERENCES:
patent: 2009839 (1935-07-01), Found
patent: 2314134 (1943-03-01), Eknayan
patent: 2443121 (1948-06-01), Smith
patent: 2479529 (1949-08-01), Watrous, Jr. et al.
patent: 2915664 (1959-12-01), Lemmers
patent: 3504218 (1970-03-01), Emidy et al.
patent: 3657590 (1972-04-01), Johnson
patent: 3657591 (1972-04-01), Johnson
patent: 3883764 (1975-03-01), Johnson et al.

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