Inventors:
Robert L. Kohne - Noblesville IN
Jack D. Bodem - Kokomo IN
Assignee:
Federal-Mogul World Wide, Inc. - Southfield MI
International Classification:
H01J 150
H01J 2310
H01J 2976
Abstract:
An inductively driven gas discharge lamp assembly (40) includes an electrodeless lamp (42), an inductive drive coil (44) disposed about the lamp, and a shield (10) disposed over an end portion (50) of the lamp. The shield (10) has a number of turns (12) of electrically conductive material, such as wire, with each of the turns being disposed generally coaxially about the central, longitudinal axis (20) of the drive coil (44). The turns (12) together form a continuous spiral helix and are shorted together via a number of electrical conductors (14) that are angularly disposed about the axis (20). These electrical conductors (14) extend generally perpendicularly to the turns (12) and are connected to the ground node (26) of a d. c. to a. c. inverter circuit 46 that is used to drive coil 44. This arrangement provides good r. f.