Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Induction-type discharge device load
Patent
1990-05-23
1991-09-10
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Induction-type discharge device load
315344, 313234, H05B 4124
Patent
active
050476939
ABSTRACT:
A starting aid for an electrodeless high intensity discharge (HID) lamp comprises a spiral starting electrode which, at least during lamp starting, conforms to the shape of the arc tube so as to provide a relatively high capacitive starting current upon receipt of a radio frequency starting signal, resulting in a rapid transition from a glow discharge to a high intensity solenoidal discharge. At least one turn of the spiral starting electrode is preferably in contact with the portion of the arc tube nearest the arc discharge to be formed and is oriented so as to provide a capacitive starting current that flows in substantially the same location as the arc discharge to further ease lamp starting. In one embodiment, the spiral starting aid comprises first and second coil portions. The first coil portion conforms to the shape of the arc tube and has at least one turn disposed nearest the portion of the arc tube where the arc discharge is to be formed. The second coil portion has at least one turn in contact with the arc tube and the remaining turns extend outwardly therefrom. Once the lamp is started, the starting aid may be moved to a predetermined location away from the arc tube.
REFERENCES:
patent: 4810938 (1979-03-01), Johnson et al.
patent: 4812702 (1990-03-01), Anderson
patent: 4894589 (1990-02-01), Borowiec
patent: 4894590 (1990-02-01), Witting
patent: 4902937 (1990-02-01), Witting
patent: 4959592 (1990-09-01), Anderson
patent: 4982140 (1991-01-01), Witting
El-Hamamsy Sayed-Amr A.
Roberts Victor D.
Thomas Robert J.
Breedlove Jill M.
Davis Jr. James C.
General Electric Company
LaRoche Eugene R.
Snyder Marvin
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