Electrodeless fluorescent lamp shield for reduction of electroma

Details Electrodeless fluorescent lamp shield for reduction of electroma Electrodeless fluorescent lamp shield for reduction of electroma

1992-08-28

1994-06-28

Pascal, Robert J.

Electric lamp and discharge devices: systems

With electromagnetic wave radiation preventing or shielding...

315248, 315 57, 315267, H01J 152

Patent

active

053250184

ABSTRACT:
An electrodeless fluorescent lamp of the type having a solenoidal drive coil wound about a ferrite core includes an inner shield between the coil and the core and further includes an outer shield about the coil. The shields are preferably constructed of sheets of flexible polyimide material with vertical bands of metal etched thereon. The metal bands are connected to ground in order to shield the core and the plasma from the electric field generated about the drive coil. By thus shielding the core, the capacitance between the coil and the core is effectively short-circuited, substantially reducing or eliminating dielectric losses of the core. The outer shield substantially reduces the EMI generated by the drive coil.

REFERENCES:
patent: 3521120 (1970-07-01), Anderson
patent: 4017764 (1977-04-01), Anderson
patent: 4187447 (1980-02-01), Stout et al.
"Electrodeless Discharge Lamp," Kobayashi Atsushi et al., Patent abstract of Japan, publication No. JP63314752, publication date Dec. 22, 1988, abstract publication date Apr. 18, 1989, abstract vol. 013160, application date Jun. 17, 1987, application No. JP870150893.

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