Capacitive starting electrodes for hid lamps

Details Capacitive starting electrodes for hid lamps Capacitive starting electrodes for hid lamps

H - Electricity

01

J

313/97

H01J 65/04 (2006.01)

Patent

CA 2000522

CAPACITIVE STARTING ELECTRODES FOR HID LAMPS Abstract of the Disclosure A pair of starting electrodes are provided for an electrodeless high-intensity-discharge lamp arc of the type having an envelope situated within the bore of an excitation coil and in the interior of which envelope is to be provided a plasma arc discharge driven by the excitation coil. Each of the starting electrodes is a conductive ring disposed adjacent to an associated one of an opposed pair of envelope surfaces, and connected to an opposite end of the excitation coil. A high-voltage signal coupled between the starting electrodes causes an electric field to be produced suffi- cient to create a glow discharge in the arc tube, and cause an almost instantaneous transition to a high-current sole- noidal discharge to form the discharge plasma responsive to the normal field provided by the excitation coil.

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