High pressure metal vapor discharge lamp with starting element

Details High pressure metal vapor discharge lamp with starting element High pressure metal vapor discharge lamp with starting element

1987-05-01

1988-05-03

Dixon, Harold

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Delayed application of the discharge potential

315 47, 315 59, 315 74, 315 75, H05B 3904

Patent

active

047422750

ABSTRACT:
A high pressure metal vapor discharge lamp comprises a light-emitting tube in which a pair of electrodes is enclosed, a starting element including a normally closed-type thermal switch and a resistive member, the starting element generating a pulse by closing and opening switch operations, a connecting element for electrically connecting the starting element to the electrodes, the pulse being applied to the electrodes through the connecting element, and a member including an insulating body provided in vicinity of the thermal switch for causing a conductive portion to be formed on the body, the conductive portion being sufficient to bypass a current supplied to the starting element by repetitions of the switch operations, thereby lowering the pulse voltage.

REFERENCES:
patent: 2286789 (1942-06-01), Dench
patent: 2332077 (1943-10-01), Hays
patent: 4135114 (1979-01-01), Narikiyo
patent: 4137483 (1979-01-01), Ochi et al.
patent: 4340841 (1982-07-01), Schupp
patent: 4388557 (1983-06-01), Shaffer
patent: 4481446 (1984-11-01), Tsuchihashi et al.
German Patent Office Search report.

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