Patents by Inventor Takao Mizushima
Takao Mizushima has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20060038651Abstract: A coil-embedded dust core of the present invention is provided with a molded coil component including a coil main body having a structure in which a flat type conductor wire is wound edgewise, one end side terminal portion disposed by being lead in the thickness direction of the coil main body, the other end side terminal portion, one end side leading electrode portion disposed by extending the one end side terminal portion, and the other end side leading electrode portion disposed by extending the other end side terminal portion; and a dust core composed of a soft magnetic alloy powder disposed covering the coil main body, the one end side terminal portion, and the other end side terminal portion of the molded coil component.Type: ApplicationFiled: August 16, 2005Publication date: February 23, 2006Inventors: Takao Mizushima, Yutaka Naito, Kazuo Aoki, Hidetaka Kemmotsu, Satoshi Watabe
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Publication number: 20050236071Abstract: An amorphous soft magnetic alloy powder which is produced by a water atomization method is provided. The powder contains an amorphous phase having a temperature interval ?Tx of a supercooled liquid of 20K or more; having a hardness Hv of 1000 or less; is provided with a layer with a high concentration of Si at a surface portion thereof; and being represented by the following composition formula: Fe100-a-b-x-y-z-w-tCOaNibMxPyCzBwSit And M is one or two or more elements selected from Cr, Mo, W, V, Nb, Ta, Ti, Zr, Hf, Pt, Pd, and Au.Type: ApplicationFiled: April 21, 2005Publication date: October 27, 2005Inventors: Hisato Koshiba, Hidetaka Kenmotsu, Yutaka Naito, Takao Mizushima
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Patent number: 6897718Abstract: A magnetic powder core comprises a molded article of a mixture of a glassy alloy powder and an insulating material. The glassy alloy comprises Fe and at least one element selected from Al, P, C, Si, and B, and has a texture primarily composed of an amorphous phase. The glassy alloy exhibits a temperature difference ?Tx, which is represented by the equation ?Tx=Tx?Tg, of at least 20 K in a supercooled liquid, wherein Tx indicates the crystallization temperature and Tg indicates the glass transition temperature. The magnetic core precursor is produced mixing the glassy alloy powder with the insulating material, compacting the mixture to form a magnetic core precursor, and annealing the magnetic core precursor at a temperature in the range between (Tg?170) K and Tg K to relieve the internal stress of the magnetic core precursor. The glassy alloy exhibits low coercive force and low core loss.Type: GrantFiled: May 20, 2003Date of Patent: May 24, 2005Assignee: Alps Electric Co., Ltd.Inventors: Shoji Yoshida, Hidetaka Kenmotsu, Takao Mizushima, Kazuaki Ikarashi, Yutaka Naito
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Patent number: 6750723Abstract: A magnetic powder core comprises a molded article of a mixture of a glassy alloy powder and an insulating material. The glassy alloy comprises Fe and at least one element selected from Al, P, C, Si, and B, and has a texture primarily composed of an amorphous phase. The glassy alloy exhibits a temperature difference &Dgr;Tx, which is represented by the equation &Dgr;Tx=Tx−Tg, of at least 20 K in a supercooled liquid, wherein Tx indicates the crystallization temperature and Tg indicates the glass transition temperature. The magnetic core precursor is produced mixing the glassy alloy powder with the insulating material, compacting the mixture to form a magnetic core precursor, and annealing the magnetic core precursor at a temperature in the range between (Tg−170) K and Tg K to relieve the internal stress of the magnetic core precursor. The glassy alloy exhibits low coercive force and low core loss.Type: GrantFiled: May 20, 2003Date of Patent: June 15, 2004Assignee: Alps Electric Co., Ltd.Inventors: Shoji Yoshida, Takao Mizushima, Yutaka Naito
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Publication number: 20030205295Abstract: A magnetic powder core comprises a molded article of a mixture of a glassy alloy powder and an insulating material. The glassy alloy comprises Fe and at least one element selected from Al, P, C, Si, and B, and has a texture primarily composed of an amorphous phase. The glassy alloy exhibits a temperature difference &Dgr;Tx, which is represented by the equation &Dgr;Tx=Tx−Tg, of at least 20 K in a supercooled liquid, wherein Tx indicates the crystallization temperature and Tg indicates the glass transition temperature. The magnetic core precursor is produced mixing the glassy alloy powder with the insulating material, compacting the mixture to form a magnetic core precursor, and annealing the magnetic core precursor at a temperature in the range between (Tg−170) K and Tg K to relieve the internal stress of the magnetic core precursor. The glassy alloy exhibits low coercive force and low core loss.Type: ApplicationFiled: May 20, 2003Publication date: November 6, 2003Inventors: Shoji Yoshida, Hidetaka Kenmotsu, Takao Mizushima, Kazuaki Ikarashi, Yutaka Naito
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Publication number: 20030201032Abstract: A magnetic powder core comprises a molded article of a mixture of a glassy alloy powder and an insulating material. The glassy alloy comprises Fe and at least one element selected from Al, P, C, Si, and B, and has a texture primarily composed of an amorphous phase. The glassy alloy exhibits a temperature difference &Dgr;Tx, which is represented by the equation &Dgr;Tx=Tx−Tg, of at least 20 K in a supercooled liquid, wherein Tx indicates the crystallization temperature and Tg indicates the glass transition temperature. The magnetic core precursor is produced mixing the glassy alloy powder with the insulating material, compacting the mixture to form a magnetic core precursor, and annealing the magnetic core precursor at a temperature in the range between (Tg−170) K and Tg K to relieve the internal stress of the magnetic core precursor. The glassy alloy exhibits low coercive force and low core loss.Type: ApplicationFiled: May 20, 2003Publication date: October 30, 2003Inventors: Shoji Yoshida, Hidetaka Kenmotsu, Takao Mizushima, Kazuaki Ikarashi, Yutaka Naito
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Patent number: 6594157Abstract: A magnetic powder core comprises a molded article of a mixture of a glassy alloy powder and an insulating material. The glassy alloy comprises Fe and at least one element selected from Al, P, C, Si, and B, and has a texture primarily composed of an amorphous phase. The glassy alloy exhibits a temperature difference &Dgr;Tx, which is represented by the equation &Dgr;Tx=Tx−Tg, of at least 20 K in a supercooled liquid, wherein Tx indicates the crystallization temperature and Tg indicates the glass transition temperature. The magnetic core precursor is produced mixing the glassy alloy powder with the insulating material, compacting the mixture to form a magnetic core precursor, and annealing the magnetic core precursor at a temperature in the range between (Tg−170) K and Tg K to relieve the internal stress of the magnetic core precursor. The glassy alloy exhibits low coercive force and low core loss.Type: GrantFiled: March 15, 2001Date of Patent: July 15, 2003Assignee: Alps Electric Co., Ltd.Inventors: Shoji Yoshida, Hidetaka Kenmotsu, Takao Mizushima, Kazuaki Ikarashi, Yutaka Naito
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Publication number: 20010036084Abstract: A magnetic powder core comprises a molded article of a mixture of a glassy alloy powder and an insulating material. The glassy alloy comprises Fe and at least one element selected from Al, P, C, Si, and B, and has a texture primarily composed of an amorphous phase. The glassy alloy exhibits a temperature difference &Dgr;Tx, which is represented by the equation &Dgr;Tx=Tx−Tg, of at least 20 K in a supercooled liquid, wherein Tx indicates the crystallization temperature and Tg indicates the glass transition temperature. The magnetic core precursor is produced mixing the glassy alloy powder with the insulating material, compacting the mixture to form a magnetic core precursor, and annealing the magnetic core precursor at a temperature in the range between (Tg−170) K and Tg K to relieve the internal stress of the magnetic core precursor. The glassy alloy exhibits low coercive force and low core loss.Type: ApplicationFiled: March 15, 2001Publication date: November 1, 2001Applicant: Alps Electric Co., Ltd.Inventors: Shoji Yoshida, Hidetaka Kenmotsu, Takao Mizushima, Kazuaki Ikarashi, Yutaka Naito
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Patent number: 6296681Abstract: The present invention relates to a sinter and a casting comprising a high-hardness glassy alloy containing at least Fe and at least a metalloid element and having a temperature interval &Dgr;Tx of a supercooled liquid as expressed by &Dgr;Tx=Tx−Tg (where, Tx is a crystallization temperature and Tg is a glass transition temperature) of at least 20° C., which permit easy achievement of a complicated concave/convex shape.Type: GrantFiled: September 29, 1999Date of Patent: October 2, 2001Assignee: Alps Electric Co., Ltd.Inventors: Takao Mizushima, Akihiro Makino, Akihisa Inoue
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Patent number: 6287514Abstract: The present invention relates to a sinter and a casting comprising a high-hardness glassy alloy containing at least Fe and at least a metalloid element and having a temperature interval &Dgr;Tx of a supercooled liquid as expressed by &Dgr;Tx=Tx−Tg (where, Tx is a crystallization temperature and Tg is a glass transition temperature) of at least 20° C., which permit easy achievement of a complicated concave/convex shape.Type: GrantFiled: September 29, 1999Date of Patent: September 11, 2001Assignee: Alps Electric Co., Ltd.Inventors: Takao Mizushima, Akihiro Makino, Akihisa Inoue
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Patent number: 6227985Abstract: The present invention relates to a sinter and a casting comprising a high-hardness glassy alloy containing at least Fe and at least a metalloid element and having a temperature interval &Dgr;Tx of a supercooled liquid as expressed by &Dgr;Tx=Tx−Tg (where, Tx is a crystallization temperature and Tg is a glass transition temperature) of at least 20° C., which permit easy achievement of a complicated concave/convex shape.Type: GrantFiled: September 29, 1999Date of Patent: May 8, 2001Assignee: Alps Electric Co., Ltd.Inventors: Takao Mizushima, Akihiro Makino, Akihisa Inoue
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Patent number: 6183889Abstract: A magneto-impedance element, showing a change in impedance in response to an external magnetic field when an alternating current is applied, is composed of a glassy alloy. The glassy alloy is composed of at least one base metal selected from the group consisting of Fe, Co and Ni; at least one additional metal selected from the group consisting of Zr, Nb, Ta, Hf, Mo, Ti and V; and B. The glassy alloy has a temperature region &Dgr;Tx, of the supercooling liquid zone of 20° C. or more which is represented by the equation &Dgr;Tx=Tx−Tg wherein Tx is the crystallization temperature and Tg is the glass transition temperature. A magnetic head, a thin film magnetic head, an azimuth sensor and an autocanceler are provided with the MI element.Type: GrantFiled: August 27, 1998Date of Patent: February 6, 2001Assignees: Alps Electric Co., Ltd.Inventors: Hisato Koshiba, Takao Mizushima, Akihoro Makino, Yoshihiro Sudo, Shinichi Sasagawa, Yuichi Shonai, Akihisa Inoue
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Patent number: 6086651Abstract: The present invention relates to a sinter and a casting comprising a high-hardness glassy alloy containing at least Fe and at least a metalloid element and having a temperature interval .DELTA.Tx of a supercooled liquid as expressed by .DELTA.Tx=Tx-Tg (where, Tx is a crystallization temperature and Tg is a glass transition temperature) of at least 20.degree. C., which permit easy achievement of a complicated concave/convex shape.Type: GrantFiled: August 26, 1998Date of Patent: July 11, 2000Assignee: Alp Electric Co., Ltd.Inventors: Takao Mizushima, Akihiro Makino, Akihisa Inoue
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Patent number: 6077367Abstract: The present invention provides a method of producing a glassy alloy which has soft magnetism at room temperature and high resistivity and which can be easily obtained in a bulk shape thicker than an amorphous alloy ribbon obtained by a conventional melt quenching method. In this method, a melted metal having a supercooled liquid temperature width .DELTA.T.sub.x of 35.degree. C. or more, which is expressed by the equation .DELTA.T.sub.x =T.sub.x -T.sub.g (wherein T.sub.x indicates the crystallization temperature, and T.sub.g indicates the glass transition temperature), is sprayed on a cooling body under movement to form a ribbon-shaped glassy alloy material; and the glassy alloy is then heat-treated by heating at a heating rate of 0.15 to 3.degree. C./sec and then cooling.Type: GrantFiled: February 19, 1998Date of Patent: June 20, 2000Assignees: Alps Electric Co., Ltd., Akihisa InoueInventors: Takao Mizushima, Akihiro Makino, Akihisa Inoue
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Patent number: 6001193Abstract: A method of producing a hard magnetic alloy compact at low cost, in which an alloy that contains not less than 50% by weight of an amorphous phase and exhibits hard magnetism in a crystallized state is solidified and molded at around its crystallization temperature under applied pressure by utilizing the softening phenomenon occurring during a crystallization process. The resulting compact has high hard magnetic characteristics and can be applied as permanent magnet members such as in motors, actuators, and speakers.Type: GrantFiled: March 25, 1997Date of Patent: December 14, 1999Assignees: Alps Electric Co., Ltd., Akihisa Inoue, Tsuyoshi MasumotoInventors: Akinori Kojima, Takao Mizushima, Akihiro Makino, Akihisa Inoue, Tsuyoshi Masumoto
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Patent number: 5961745Abstract: The present invention is directed to provide a Fe based glassy alloy which exhibits soft magnetic characteristics at room temperature, has a thickness greater than that of a conventional amorphous alloy prepared by a liquid quenching process and can be easily formed in bulk. The Fe based glassy alloy in accordance with the present invention has a temperature distance .DELTA.T.sub.x, expressed by the equation .DELTA.T.sub.x =T.sub.x -T.sub.g, of a supercooled liquid of not less than 35.degree. C., wherein Tx indicates crystallization temperature and Tg represents glass transition temperature.Type: GrantFiled: March 26, 1997Date of Patent: October 5, 1999Assignees: Alps Electric Co., Ltd., Akihisa Inoue, Japan Science and Technology Corp.Inventors: Akihisa Inoue, Takao Mizushima, Kouichi Fujita, Oki Yamaguchi, Akihiro Makino
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Patent number: 5755986Abstract: A high-frequency composite material, having soft magnetic and dielectric characteristics, comprising a soft magnetic alloy powder represented by the general composition A.sub.a M.sub.b D.sub.c and a synthetic resin, wherein A represents at least one element or mixture thereof selected from the group consisting of Fe, Co and Ni; M represents at least one element or mixture thereof selected from the group consisting of Hf, Zr, W, Ti, V, Nb, Mo, Cr, Mg, Mn, Al, Si, Ca, Sr, Ba, Cu, Ga, Ge, As, Se, Zn, Cd, In, Sn, Sb, Te, Pb, Bi and rare earth elements; D represents at least one element or mixture thereof selected from the group consisting of O, C, N and B; and the suffixes a, b, and c in the general formula A.sub.a M.sub.b D.sub.c satisfy the following equations represented by atomic percent: 40.ltoreq.a<80, 0.ltoreq.b.ltoreq.30, and 0<c.ltoreq.50.Type: GrantFiled: September 19, 1996Date of Patent: May 26, 1998Assignee: Alps Electric Co., Ltd.Inventors: Yutaka Yamamoto, Takao Mizushima, Akihiro Makino, Takashi Hatanai, Teruyoshi Kubokawa