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AssigneeNEC Tokin Corporation
InventorsTeruhiko Fujiwara, Masayoshi Ishii, Haruki Hoshi, Keita Isogai, Hatsuo Matsumoto, Toru Ito, Tamiko Ambo
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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.
A permanent magnet which is a bond magnet comprising a plastic resin and magnetic powder dispersed in the plastic resin without any inorganic glass, wherein said magnet has a specific resistance of 0.1 Ω•cm or more and said magnetic powder has an intrinsic coercive force of 5 kOe or more, a Curie point Tc of 300° C. or more, and the maximum particle size which is equal to or less than 150 μm.
Dependencies are inferred from the claim text.