Electric lamp and discharge devices – With gas or vapor – Three or more electrode discharge device
Patent
1988-12-20
1990-07-03
Wieder, Kenneth
Electric lamp and discharge devices
With gas or vapor
Three or more electrode discharge device
313596, 313 8, H01J 6154
Patent
active
049394177
ABSTRACT:
A high pressure sodium arc tube assembly includes a light-transmitting arc tube containing a fill material including sodium and mercury, a pair of electrodes sealed in opposite ends of the arc tube, and a filament or other resisitive member located within the arc tube and extending between opposite ends thereof. The filament is electrically connected to the electrodes. The filament provides a sufficient electric field and an abundance of electrons dispersed throughout the discharge region to initiate an arc discharge when the electrodes are energized. The filament is selected to produce an electric field in the discharge region prior to initiation of arc discharge of at least 20 volts per centimeter. After an arc discharge is initiated, the voltage between the electrodes drops, and the filament is partially short-circuited by the arc discharge. The filament provides fast initial starting and fast hot restarting, while eliminating the requirement for high voltage starting pulses.
REFERENCES:
patent: 1006333 (1911-10-01), Wood
patent: 2094848 (1937-10-01), Roberts
Biblarz Oscar
Michael Joseph D.
Thibault Paul
GTE Products Corporation
Romanow Joseph S.
Wieder Kenneth
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