Electric lamp and discharge devices: systems – Automatic substitution of the load device or electrode – Plural load devices with selective substitution of load...
Patent
1978-03-10
1979-10-09
Chatmon, Jr., Saxfield
Electric lamp and discharge devices: systems
Automatic substitution of the load device or electrode
Plural load devices with selective substitution of load...
315 74, 315 88, 315100, H05B 3910, H05B 4146
Patent
active
041707443
ABSTRACT:
A combination lamp comprises a miniature arc tube, a standby filament and a thermal switch in a sealed vitreous envelope. The switch is connected in series with the filament, and the arc tube and the filament have separate inleads for external connections. The switch is closed at room temperature, allowing the filament to light up immediately at a cold start and providing an instant-on feature. During normal operation, heat and light radiated by the arc tube cause the switch to open and turn off the filament. The small size of the arc tube favors a heat balance which allows the thermal switch to cool and reclose quickly in the event of a current interruption, thereby assuring lighting after an acceptably brief delay in the event of a hot restart.
REFERENCES:
patent: 2513840 (1950-07-01), Berland et al.
patent: 2714689 (1955-08-01), Waguet
patent: 2899583 (1959-08-01), Macksoud
patent: 3611432 (1971-10-01), Babcock
patent: 3679931 (1972-07-01), Powell
patent: 3693045 (1972-09-01), Price
patent: 4005331 (1977-01-01), Horowitz
patent: 4047076 (1977-09-01), McNamara, Jr.
patent: 4117370 (1978-09-01), Jacobs et al.
Chatmon, Jr. Saxfield
General Electric Company
Kempton Lawrence R.
Legree Ernest W.
Neuhauser Frank L.
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