Murata Manufacturing Co., Ltd.

Koichi Ida

Hideaki Ooi

Takuya Ishida

Mitsuru Odahara

Mikito Sugiyama

Yuya Ishida

Isao Ida

Keiichi Ishida

Hou Muramoto

Tarou Kawaguchi

Shun Ozaki

A soft magnetic powder includes soft magnetic particles each having a nucleus that contains a soft magnetic metal and an insulating film on the surface of the nucleus. The insulating film contains Si and a hydrocarbon group having a C8 or longer linear-chain moiety, and the ratio by weight of Si to C in the insulating film is 7.6 or more and 42.8 or less (i.e., from 7.6 to 42.8).

Soft magnetic powder and inductor

A magnetic material and an inductor capable of attaining both higher magnetic permeability and improved DC superposition characteristics. A composite magnetic material contains metal magnetic particles, in which the metal magnetic particles include first particles having a median diameter Dof 1.3 μm or more and 5.0 μm or less (i.e., from 1.3 μm to 5.0 μm), and second particles having a median diameter Dlarger than the first particles. The first and second particles each include a core portion made of a metal magnetic material, and an insulating film provided on a surface of the core portion. The insulating film of the second particles has an average thickness of 40 nm or more and 100 nm or less (i.e., from 40 nm to 100 nm). The insulating film of the first particles has an average thickness smaller than that of the insulating film of the second particles.

Composite magnetic material and inductor using the same

A coil component that can maintain a high magnetic permeability and improve a DC superposition characteristic, and a method for producing a magnetic powder-containing resin material used to provide such a coil component. A coil component according includes an element body including a coil conductor and a magnetic portion. The coil conductor is formed of a wound conductor wire. The magnetic portion containing metal magnetic material grains covered with an insulating coating, a resin, and insulator grains. The coil component further includes an external electrode electrically connected to an extended portion of the coil conductor and disposed on a surface of the element body. The insulator grains have a relative permeability lower than a relative permeability of the metal magnetic material grains, and the insulator grains and the insulating coating are a compound whose main component is the same.

Coil component and method for producing magnetic powder-containing resin material used therefor

A magnetic material and an inductor capable of attaining both higher magnetic permeability and improved DC superposition characteristics. A composite magnetic material contains metal magnetic particles, in which the metal magnetic particles include first particles having a median diameter Dof 1.3 &#x3bc;m or more and 5.0 &#x3bc;m or less (i.e., from 1.3 &#x3bc;m to 5.0 &#x3bc;m), and second particles having a median diameter Dlarger than the first particles. The first and second particles each include a core portion made of a metal magnetic material, and an insulating film provided on a surface of the core portion. The insulating film of the second particles has an average thickness of 40 nm or more and 100 nm or less (i.e., from 40 nm to 100 nm). The insulating film of the first particles has an average thickness smaller than that of the insulating film of the second particles.

An electronic component includes a coil, or a coiled conductor, and a molded body including a sealant containing resin and magnetic powder, and encapsulating the coil. The coil is coated with a cured product of a thermosetting composition, and the coated body is embedded in the molded body. A method of manufacturing the electronic component includes forming a coil by winding a conductor, applying a thermosetting composition on the coil, heat treating the coil on which the composition is applied to obtain a coated body, embedding the coated body into a sealant containing resin and magnetic powder, and applying pressure to the sealant to form a molded body.

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Nagaokakyo, Japan

Koichi Ida