High frequency electrodeless lamp having a gapped magnetic...

H - Electricity – 05 – B

Patent

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313/111, 316/19,

H05B 41/16 (2006.01) H01J 65/04 (2006.01) H05B 41/24 (2006.01)

Patent

CA 1144224

38 47,719I2 ABSTRACT OF THE DISCLOSURE 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 electro- magnetic 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 spec- ially designed to include narrow gap means of low-permea- bility substance and this gap improves lamp performance by providing the dual function of stabilizing the output frequency of the tuned circuit to compensate for varia- tions 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 ex- tremes required for proper envelope processing.

357794

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