Inductor devices – Core forms casing
Reexamination Certificate
2010-01-22
2011-11-08
Nguyen, Tuyen (Department: 2832)
Inductor devices
Core forms casing
Reexamination Certificate
active
08054151
ABSTRACT:
A compact inductor comprises a coil, a coil-burying body, and a body for a closed magnetic circuit. The coil-burying body is a fired porous ceramic body having a first magnetic permeability, in which the coil is buried. In the coil-burying body, “a through-hole12apassing through inside of the coil along an axis of the coil” is formed. The body for a closed magnetic circuit is a fired dense ceramic body having a second magnetic permeability greater than the first magnetic permeability. The body for a closed magnetic circuit is arranged closely/densely at an outer circumference portion of the coil-burying body and in the through-hole. A magnetic path is therefore formed mainly within the body for a closed magnetic circuit, and the magnetic flux density is reduced in an area close to the coil. Accordingly, an inductor having the excellent superimposed DC current characteristic is provided.
REFERENCES:
patent: 6661328 (2003-12-01), Inoue et al.
patent: 6825746 (2004-11-01), Otsuka et al.
patent: 7230514 (2007-06-01), Brunner
patent: 7859377 (2010-12-01), Kawarai
patent: 2001-267129 (2001-09-01), None
Kobayashi Nobuyuki
Mizuno Kazuyuki
Ozawa Shuichi
Shimogawa Natsumi
Burr & Brown
NGK Insulators Ltd.
Nguyen Tuyen
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