Spiral single starting electrode for HID lamps

Details Spiral single starting electrode for HID lamps Spiral single starting electrode for HID lamps

1988-08-01

1990-01-16

Mis, David

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Induction-type discharge device load

313146, 313151, 313153, H05B 4124

Patent

active

048945900

ABSTRACT:
A single starting electrode is provided for an electrodeless high-intensity-discharge lamp arc of the type having an arc tube situated within the bore of an excitation coil and in the interior of which arc tube is to be provided a plasma arc discharge driven by the excitation coil. The starting electrode is a conductive conical spiral having a narrower end disposed adjacent to one of the arc tube surfaces. A high voltage is formed by induction, as the spiral electrode receives an RF magnetic flux, to cause an electric field to be produced sufficient to create a glow discharge in the arc tube, and cause a rapid transition to a high-current solenoidal discharge to form the discharge plasma responsive to the normal field provided by the excitation coil.

REFERENCES:
patent: 4812702 (1989-03-01), Anderson

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