Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Induction-type discharge device load
Patent
1979-08-08
1981-11-03
Chatmon, Jr., Saxfield
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Induction-type discharge device load
315 39, 315 57, 315344, 336212, 336216, H05B 4116, H05B 4124
Patent
active
042988284
ABSTRACT:
High frequency electrodeless (HFE) lamp has high-permeability core such as ferrite positioned in energy transferring relationship with respect to the phosphor-coated lamp envelope. The core forms a part of a tuned circuit output for a radio-frequency energizing source and during lamp operation, the resulting electromagnetic fields generated within the lamp envelope create a discharge which in turn generates radiations to excite the phosphor to produce visible light. The core is specially designed to include narrow gap means of low-permeability substance and this gap improves lamp performance by providing the dual function of stabilizing the output frequency of the tuned circuit to compensate for variations in permeability of the core and, in addition, the resulting increased Q of the tuned circuit substantially suppresses harmonics of the resonant frequency which are undesirable in such a lamp. There is also provided a method for assembling such a lamp as well as the finished lamp wherein the phosphor-coated envelope can be processed and sealed, and thereafter the core is assembled therewith so that the core is not subject to the temperature extremes required for proper envelope processing.
REFERENCES:
patent: 1813580 (1931-07-01), Morrison
patent: 3611191 (1971-10-01), Altman et al.
patent: 3884583 (1975-05-01), Kikuchi
patent: 3987335 (1976-10-01), Anders on
patent: 4048604 (1977-09-01), Vallet
patent: 4070602 (1978-01-01), Ferro et al.
Justice James W. H.
Nahemow Martin D.
Chatmon, Jr. Saxfield
Palmer W. D.
Westinghouse Electric Corp.
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