Electric lamp and discharge devices – With magnetic device
Reexamination Certificate
2007-02-20
2007-02-20
Williams, Joseph (Department: 2879)
Electric lamp and discharge devices
With magnetic device
C313S154000, C313S155000, C313S156000, C313S160000, C315S248000, C315S344000
Reexamination Certificate
active
10872058
ABSTRACT:
An electrodeless fluorescent lamp10has an envelope12that includes a chamber14. A core16of magnetic material, preferably ferrite, is positioned in the chamber14and has a first winding18surrounding the core and having first and second lead-in wires20, 22, attached to a high frequency voltage supply or ballast24. A second winding26surrounds the core16, respective turns of the second winding26being located adjacent turns of the first winding18and electrically insulated therefrom. The second winding26has a free end28and has another end30connected to one of the lead-in wires, for example20. A braided sheath32surrounds the other of the lead-in wires22. The first winding18is generally called the RF antenna. The braided sheath32is connected to the local ground. This inexpensive solution alone reduces the conductive EMI level sufficiently to pass all existing regulations on such interference with significant reserve.
REFERENCES:
patent: 4710678 (1987-12-01), Houkes et al.
patent: 4977354 (1990-12-01), Bergervoet et al.
patent: 5694000 (1997-12-01), Antonis et al.
patent: 5726523 (1998-03-01), Popov et al.
patent: 5866991 (1999-02-01), Farkas et al.
Alexandrovich Benjamin M.
Godyak Valery A.
Sapozhnikov Alexander A.
Bessone Carlo S.
Osram Sylvania Inc.
Sanei Hana Asmat
Williams Joseph
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