Electrodeless fluorescent lamp

Electric lamp and discharge devices: systems – Combined load device or load device temperature modifying... – Discharge device load

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313491, 313493, 315248, 315267, 315276, 315348, H05B 4124

Patent

active

040053300

ABSTRACT:
An electrodeless fluorescent lamp adapted for economical substitution in place of an existing incandescent lamp comprises an ionizable medium contained within a phosphor coated globular envelope. A closed loop magnetic core transformer, contained within a reentrant cavity in the base of the envelope, induces a radio frequency electric field which ionizes the medium to stimulate production of visible light output from the phosphor. A tubular extension of the envelope traverses the cavity, linking the core with a column of ionizable medium, to form a "secondary winding" on the transformer. A base assembly, attached to the envelope, supports a lamp plug for receipt of input energy. A radio frequency power supply, contained within the base assembly, provides electric current to a primary winding on the core.
A method for producing lamps in accordance with the invention comprises preforming the reentrant cavity, threading the magnetic core and winding structure onto a tubular member; fusing that member to the cavity; and assembling the cavity structure to a phosphor coated, globular shell.

REFERENCES:
patent: 966204 (1910-08-01), Hewitt
patent: 2030957 (1936-02-01), Bethenod et al.
patent: 2118452 (1938-05-01), LeBel
patent: 3500118 (1970-03-01), Anderson
patent: 3521120 (1970-07-01), Anderson
patent: 3551742 (1970-12-01), Gruzdev et al.
patent: 3611009 (1971-10-01), McNeil

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