Electric lamp and discharge devices: systems – Combined load device or load device temperature modifying... – Electric switch inside evacuated or gas filled envelope
Patent
1976-06-25
1979-03-06
Demeo, Palmer C.
Electric lamp and discharge devices: systems
Combined load device or load device temperature modifying...
Electric switch inside evacuated or gas filled envelope
313 25, 315 49, 315 75, H01J 6156, H05B 4122
Patent
active
041433017
ABSTRACT:
Safety devices for high intensity discharge lamps, having an outer envelope and an inner arc tube in which the arc discharge is produced, for extinguishing the arc in a relatively short period of time. A switching element is placed in series with the current supply to the arc tube and the element opens when the outer envelope is broken. In one embodiment, the switching element is a normally closed thermostatic switch in series with a second filament which is connected in parallel with a first filament. During starting the switching element is closed and both of the filaments are in series with the arc tube and both receive a part of the high starting lamp current. The thermostatic switch opens when the lamp reaches operating temperature so that all of the current passes through the first filament if the envelope breaks causing the first filament to burn out. The switch then closes so that all of the current passes through the second filament causing it to burn out. In another embodiment, a pressure sensitive switch is used which opens the current supply to the arc tube when the envelope breaks.
REFERENCES:
patent: 4013919 (1977-03-01), Corbley
Sheinberg Lawrence
Strauss Herbert S.
DeMeo Palmer C.
Duro-Test Corporation
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