High pressure metal vapor discharge lamp

Details High pressure metal vapor discharge lamp High pressure metal vapor discharge lamp

1980-05-23

1982-08-10

Chatmon, Jr., Saxfield

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Filament, electric heater, or resistance in shunt with the...

315 49, 315 73, 315104, H01J 744, H01J 1346, H01J 1978, H01J 2996

Patent

active

043440185

ABSTRACT:
A high pressure metal vapor discharge lamp according to the present invention comprises the following first and second starting aid circuits mounted within an outer envelope. The first starting aid circuit includes a starting aid and a first thermal switch, and the second starting aid circuit includes a resistive element and a second thermal switch. These two thermal switches are arranged so that at the time of re-starting after a certain period of stopping, the first thermal switch is reset earlier than the second thermal switch. In this high pressure metal vapor discharge lamp having this specific structure, the starting characteristic is improved, and a high voltage pulse generated by the second starting aid circuit and a ballast is assuredly absorbed by an arc tube and occurrence of dielectric breakdown in the respective elements can be completely prevented.

REFERENCES:
patent: 3746914 (1973-07-01), Olson et al.
patent: 4135114 (1979-01-01), Narikiyo
patent: 4137483 (1979-01-01), Ochi et al.
patent: 4258288 (1981-03-01), Michael et al.
patent: 4316122 (1982-02-01), Yamazaki et al.

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