Electric lamp and discharge devices: systems – With electromagnetic wave radiation preventing or shielding...
Patent
1978-09-11
1980-02-05
Gensler, Paul L.
Electric lamp and discharge devices: systems
With electromagnetic wave radiation preventing or shielding...
315 54, 315 57, H01J 152
Patent
active
041874471
ABSTRACT:
Spurious electromagnetic radiation from an electrodeless fluorescent lamp having a phosphor-coated, globular glass envelope containing an ionizable gas surrounding at least a portion of a toroidal magnetic core is reduced by situating a conductive loop about the envelope such that the loop and core planes are normal to each other. The loop also acts as the harp for a lampshade. Radio frequency energy, coupled into the gas from the core to ionize and excite the gas to emit ultraviolet radiation and thus stimulate visible radiation from the phosphor, also radiates from the lamp. The loop, driven by the radiated radio frequency energy, creates an opposing electromagnetic field. Cancellation of the radiated radio frequency energy thus tends to occur at a distance from the lamp, sharply reducing electromagnetic interference from the lamp.
REFERENCES:
patent: 3500118 (1970-03-01), Anderson
patent: 3521120 (1970-07-01), Anderson
patent: 3987335 (1976-10-01), Anderson
patent: 4005330 (1977-01-01), Glascock et al.
patent: 4096556 (1978-06-01), Berger et al.
Anderson John M.
Stout Virgil L.
Cohen Joseph T.
General Electric Company
Gensler Paul L.
Roberts Charles F.
Snyder Marvin
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