Amalgam support in an electrodeless fluorescent lamp

Details Amalgam support in an electrodeless fluorescent lamp Amalgam support in an electrodeless fluorescent lamp

1993-12-15

1995-05-02

Gross, Anita Pellman

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Induction-type discharge device load

313160, 313490, 313493, 315344, H05B 4116

Patent

active

054122880

ABSTRACT:
An electrodeless SEF fluorescent discharge lamp of the type having an envelope with a re-entrant cavity formed therein for containing an excitation coil includes an amalgam positioned for maintaining an optimum mercury vapor pressure during lamp operation. An exhaust tube extending through the re-entrant cavity has an extension into the envelope toward the apex of the lamp envelope. The exhaust tube extension has a rim portion for holding an amalgam support in position within the lamp envelope. The amalgam support preferably comprises a wire wrapped about and held in place by the rim portion. At the other end of the wire, an amalgam is wetted to a wire screen or helical wire structure at a predetermined optimal location within the lamp envelope. Alternatively, two amalgams are supported by the amalgam support at predetermined optimal locations for starting and steady-state operation of the lamp, respectively.

REFERENCES:
patent: 4010400 (1977-03-01), Hollister
patent: 4105910 (1978-08-01), Evans
patent: 4262231 (1981-04-01), Anderson et al.
patent: 4437041 (1984-03-01), Roberts
patent: 4539508 (1985-09-01), Mulder et al.
patent: 4622495 (1986-11-01), Smeelen

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