Fluorescent lamp with cathode heat switches

Electric lamp and discharge devices: systems – Combined load device or load device temperature modifying... – Electric switch inside evacuated or gas filled envelope

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313 51, 313623, 315 74, H01J 744, H01J 1346, H01J 1978, H01J 2996

Patent

active

045174938

ABSTRACT:
A rapid start fluorescent lamp comprising a pair of cathode mounts each having a pair of lead-in wires for cathode heating current, and a thermal switch to turn off the heating current after sufficient cathode heating for the lamp to operate. A third lead-in wire in each mount bypasses the thermal switch and is used for heating the cathodes to activate them during manufacturing.

REFERENCES:
patent: 2462335 (1949-02-01), Reinhardt
patent: 4097779 (1978-06-01), Latassa
patent: 4114968 (1978-09-01), Latassa
patent: 4132922 (1979-01-01), Newton et al.
patent: 4156831 (1979-05-01), Cassidy et al.

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