High frequency electrodeless lamp having a gapped magnetic core

Details High frequency electrodeless lamp having a gapped magnetic core High frequency electrodeless lamp having a gapped magnetic core

H - Electricity

05

B

315/28

H05B 41/16 (2006.01)

Patent

CA 1144979

47,719 HIGH FREQUENCY ELECTRODELESS LAMP HAVING A GAPPED MAGNETIC CORE ABSTRACT OF THE DISCLOSURE High frequency electrodeless (HFE) lamp has high- permeability core such as ferrite at least partially posi- tioned within 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 a narrow gap of low-perme- ability substance and this gap improves lamp performance by providing the dual function of stabilizing the output fre- quency 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 harmonies of the resonant frequency which are undesirable in such a lamp.

315635

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