Inductor devices – With permanent magnet
Reexamination Certificate
2006-02-07
2006-02-07
Nguyen, Tuyen T (Department: 2832)
Inductor devices
With permanent magnet
C336S178000
Reexamination Certificate
active
06995643
ABSTRACT:
In order to provide an inductance part having excellent DC superposition characteristic and core-loss, a magnetically biasing magnet, which is disposed in a magnetic gap of a magnetic core, is a bond magnet comprising magnetic powder and plastic resin with the content of the resin being 20% or more on the base of volumetric ratio and which has a specific resistance of 0.1Ω·cm or more. The magnetic powder used is rare-earth magnetic powder having an intrinsic coercive force of 5 kOe or more, Curie point of 300° C. or more, and an average particle size of 2.0–50 μm. A magnetically biasing magnet used in an inductance part that is treated by the reflow soldering method has a resin content of 30% or more and the magnetic powder used therein is Sm—Co magnetic powder having an intrinsic coercive force of 10 kOe or more, Curie point of 500° C. or more, and an average particle size of 2.5–50 μm. A thin magnet having a thickness of 500 μm or less can be realized for a small-sized inductance part.
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Ambo Tamiko
Fujiwara Teruhiko
Hoshi Haruki
Ishii Masayoshi
Isogai Keita
Frishauf Holtz Goodman & Chick P.C.
NEC Tokin Corporation
Nguyen Tuyen T
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