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).

  • Patent number: 10950374
    Abstract: Provided is an Fe-based alloy composition capable of forming an amorphous soft magnetic material which contains no P and which has a glass transition temperature Tg, the Fe-based alloy composition having a composition represented by the formula (Fe1?aTa)100at %?(x+b+c+d)MxBbCcSid, where T is an arbitrary added element such as Ni and M is an arbitrary added element such as Cr, the formula satisfying the following conditions: 0?a?0.3, 11.0 at %?b?18.20 at %, 6.00 at %?c?17 at %, 0 at %?d?10 at %, and 0 at %?x?4 at %.
    Type: Grant
    Filed: July 13, 2018
    Date of Patent: March 16, 2021
    Assignee: Alps Alpine Co., Ltd.
    Inventors: Hisato Koshiba, Takao Mizushima, Takafumi Hibino, Teruo Bitoh
  • Publication number: 20200343029
    Abstract: The present application relates to an alloy powder composition, a method for manufacturing a molding from the alloy powder composition, a molding obtained from the method, and an inductor comprising the molding. The alloy powder composition comprises an Fe-based amorphous alloy powder and an Fe-based crystalline alloy powder; wherein the Fe-based amorphous alloy powder has a volume resistivity of equal to or less than 1×106 ?·cm when subjected to a force of 20 kN and the Fe-based crystalline alloy powder has a volume resistivity of equal to or greater than 1×106 ?·cm when subjected to a force of 20 kN; and wherein the Fe-based amorphous alloy powder comprises Fe, Co, Cr, C, P, and Si.
    Type: Application
    Filed: June 24, 2019
    Publication date: October 29, 2020
    Applicant: CHILISIN ELECTRONICS CORP.
    Inventor: TAKAO MIZUSHIMA
  • Patent number: 10283266
    Abstract: A powder core includes: a powder of a crystalline magnetic material; and a powder of an amorphous magnetic material, in which a median diameter D50A of the powder of the amorphous magnetic material is 15 ?m or less, and satisfies the expression: 1?D50A/D50C?3.5 with respect to a median diameter D50C of the powder of the crystalline magnetic material.
    Type: Grant
    Filed: March 29, 2017
    Date of Patent: May 7, 2019
    Assignee: Alps Alpine Co., Ltd.
    Inventors: Ryo Nakabayashi, Akinori Kojima, Seiichi Abiko, Keiichiro Sato, Akira Sato, Takao Mizushima
  • Publication number: 20180322991
    Abstract: Provided is an Fe-based alloy composition capable of forming an amorphous soft magnetic material which contains no P and which has a glass transition temperature Tg, the Fe-based alloy composition having a composition represented by the formula (Fe1?aTa)100at%?(x+b+c+d)MxBbCcSid, where T is an arbitrary added element such as Ni and M is an arbitrary added element such as Cr, the formula satisfying the following conditions: 0?a?0.3, 11.0 at %?b?18.20 at %, 6.00 at %?c?17 at %, 0 at %?d?10 at %, and 0 at %?x?4 at %.
    Type: Application
    Filed: July 13, 2018
    Publication date: November 8, 2018
    Inventors: Hisato KOSHIBA, Takao MIZUSHIMA, Takafumi HIBINO, Teruo BITOH
  • Patent number: 9831790
    Abstract: A DC-to-DC converter includes a voltage converter having: a capacitance; at least one inductor configured to store energy and exchange stored energy with the capacitance; and a switching element configured to switch on and off a current flowing through the inductor and change direction of the current at each switching. The inductor includes a variable inductor whose inductance decreases with increase in the current.
    Type: Grant
    Filed: September 17, 2015
    Date of Patent: November 28, 2017
    Assignee: ALPS ELECTRIC CO., LTD.
    Inventors: Takao Mizushima, Masahiro Iizuka, Yutaka Naito, Kinshiro Takadate, Kazuki Iwaya, Eiichi Takahashi
  • Publication number: 20170309387
    Abstract: A powder core includes: a powder of a crystalline magnetic material; and a powder of an amorphous magnetic material, in which a median diameter D50A of the powder of the amorphous magnetic material is 15 ?m or less, and satisfies the expression: 1?D50A/D50C?3.5 with respect to a median diameter D50C of the powder of the crystalline magnetic material.
    Type: Application
    Filed: March 29, 2017
    Publication date: October 26, 2017
    Inventors: Ryo NAKABAYASHI, Akinori KOJIMA, Seiichi ABIKO, Keiichiro SATO, Akira SATO, Takao MIZUSHIMA
  • Publication number: 20170278618
    Abstract: A dust core includes a compact containing a soft magnetic powder and also includes a cover coat for the compact. The cover coat contains a polyamideimide-modified epoxy resin. An electric/electronic component includes the dust core, a coil, and a connection terminal connected to each end portion of the coil. At least one portion of the dust core is placed so as to be located in an induced magnetic field generated by the current flowing in the coil through the connection terminal. An electric/electronic device includes the electric/electronic component.
    Type: Application
    Filed: June 14, 2017
    Publication date: September 28, 2017
    Inventors: Masao MATSUI, Satoshi MARUYAMA, Takao MIZUSHIMA
  • Patent number: 9422614
    Abstract: An Fe-based amorphous alloy of the present invention has a composition formula represented by Fe100-a-b-c-x-y-z-tNiaSnbCrcPxCyBzSit, and in the formula, 1 at %?a?10 at %, 0 at %?b?3 at %, 0 at %?c?6 at %, 6.8 at %?x?10.8 at %, 2.2 at %?y?9.8 at %, 0 at %?z?4.2 at %, and 0 at %?t?3.9 at % hold. Accordingly, an Fe-based amorphous alloy used for a powder core and/or a coil encapsulated powder core having a low glass transition temperature (Tg), a high conversion vitrification temperature (Tg/Tm), and excellent magnetization and corrosion resistance can be manufactured.
    Type: Grant
    Filed: December 11, 2013
    Date of Patent: August 23, 2016
    Assignee: ALPS GREEN DEVICES CO., LTD.
    Inventors: Keiko Tsuchiya, Hisato Koshiba, Kazuya Kaneko, Seiichi Abiko, Takao Mizushima
  • Publication number: 20160079866
    Abstract: A DC-to-DC converter includes a voltage converter having: a capacitance; at least one inductor configured to store energy and exchange stored energy with the capacitance; and a switching element configured to switch on and off a current flowing through the inductor and change direction of the current at each switching. The inductor includes a variable inductor whose inductance decreases with increase in the current.
    Type: Application
    Filed: September 17, 2015
    Publication date: March 17, 2016
    Inventors: Takao Mizushima, Masahiro lizuka, Yutaka Naito, Kinshiro Takadate, Kazuki Iwaya, Eiichi Takahashi
  • Publication number: 20140097922
    Abstract: An Fe-based amorphous alloy of the present invention has a composition formula represented by Fe100-a-b-c-x-y-z-tNiaSnbCrcPxCyBzSit, and in the formula, 1 at %?a?10 at %, 0 at %?b?3 at %, 0 at %?c?6 at %, 6.8 at %?x?10.8 at %, 2.2 at %?y?9.8 at %, 0 at %?z?4.2 at %, and 0 at %?t?3.9 at % hold. Accordingly, an Fe-based amorphous alloy used for a powder core and/or a coil encapsulated powder core having a low glass transition temperature (Tg), a high conversion vitrification temperature (Tg/Tm), and excellent magnetization and corrosion resistance can be manufactured.
    Type: Application
    Filed: December 11, 2013
    Publication date: April 10, 2014
    Applicant: Alps Green Devices Co., Ltd.
    Inventors: Keiko TSUCHIYA, Hisato KOSHIBA, Kazuya KANEKO, Seiichi ABIKO, Takao MIZUSHIMA
  • Patent number: 8685179
    Abstract: An Fe-based amorphous alloy of the present invention has a composition formula represented by Fe100-a-b-c-x-y-z-tNiaSnbCrcPxCyBzSit, and in the formula, 0 at %?a?10 at %, 0 at %?b?3 at %, 0 at %?c?6 at %, 6.8 at %?x?10.8 at %, 2.2 at %?y?9.8 at %, 0 at %?z?4.2 at %, and 0 at %?t?3.9 at % hold. Accordingly, an Fe-based amorphous alloy used for a powder core and/or a coil encapsulated powder core having a low glass transition temperature (Tg), a high conversion vitrification temperature (Tg/Tm), and excellent magnetization and corrosion resistance can be manufactured.
    Type: Grant
    Filed: December 19, 2011
    Date of Patent: April 1, 2014
    Assignee: Alps Green Devices Co., Ltd.
    Inventors: Keiko Tsuchiya, Hisato Koshiba, Kazuya Kaneko, Seiichi Abiko, Takao Mizushima
  • Patent number: 8282745
    Abstract: An Fe-based soft magnetic alloy includes: Fe; and a component R, wherein the component R contains at least one of P, C, B, and Si, there is a temperature difference of equal to or greater than 20° C. between a precipitation temperature of an ?-Fe crystal phase and a precipitation temperature of an Fe compound, the Fe-based soft magnetic alloy is formed of a mixed-phase structure in which an amorphous phase and the ?-Fe crystal phase are mixed, and a diameter of a crystallite of the ?-Fe crystal phase is equal to or smaller than 50 nm, and a volume fraction of the ?-Fe crystal phase to the total is equal to or lower than 40%. In addition, the composition formula is represented by Fe100?x?uJxRu, a component J contains at least one of Cr, Co, Ni, and Nb, and 0 at %?x?6 at %, 17 at %?u?25 at %, and 17 at %?x+u?27.1 at % are satisfied.
    Type: Grant
    Filed: July 11, 2011
    Date of Patent: October 9, 2012
    Assignee: Alps Green Devices Co., Ltd.
    Inventors: Keiko Tsuchiya, Hisato Koshiba, Jun Okamoto, Takao Mizushima
  • Publication number: 20120092111
    Abstract: An Fe-based amorphous alloy of the present invention has a composition formula represented by Fe100-a-b-c-x-y-z-tNiaSnbCrcPxCyBzSit, and in the formula, 0 at %?a?10 at %, 0 at %?b?3 at %, 0 at %?c?6 at %, 6.8 at %?x?10.8 at %, 2.2 at %?y?9.8 at %, 0 at %?z?4.2 at %, and 0 at %?t?3.9 at % hold. Accordingly, an Fe-based amorphous alloy used for a powder core and/or a coil encapsulated powder core having a low glass transition temperature (Tg), a high conversion vitrification temperature (Tg/Tm), and excellent magnetization and corrosion resistance can be manufactured.
    Type: Application
    Filed: December 19, 2011
    Publication date: April 19, 2012
    Applicant: ALPS GREEN DEVICES CO., LTD.
    Inventors: Keiko TSUCHIYA, Hisato KOSHIBA, Kazuya KANEKO, Seiichi ABIKO, Takao MIZUSHIMA
  • Publication number: 20110265915
    Abstract: An Fe-based soft magnetic alloy includes: Fe; and a component R, wherein the component R contains at least one of P, C, B, and Si, there is a temperature difference of equal to or greater than 20° C. between a precipitation temperature of an ?-Fe crystal phase and a precipitation temperature of an Fe compound, the Fe-based soft magnetic alloy is formed of a mixed-phase structure in which an amorphous phase and the ?-Fe crystal phase are mixed, and a diameter of a crystallite of the ?-Fe crystal phase is equal to or smaller than 50 nm, and a volume fraction of the ?-Fe crystal phase to the total is equal to or lower than 40%. In addition, the composition formula is represented by Fe100-x-uJxRu, a component J contains at least one of Cr, Co, Ni, and Nb, and 0 at %?x?6 at %, 17 at %?u?25 at %, and 17 at %?x+u?27.1 at % are satisfied.
    Type: Application
    Filed: July 11, 2011
    Publication date: November 3, 2011
    Applicant: ALPS GREEN DEVICES CO., LTD.
    Inventors: Keiko TSUCHIYA, Hisato KOSHIBA, Jun OKAMOTO, Takao MIZUSHIMA
  • Publication number: 20090017279
    Abstract: An electromagnetic wave suppressing sheet according to the invention is a sheet including a magnetic powder and an insulating material. A real part of a permittivity in an in-plane direction of the sheet is about 200 or more, and an imaginary part thereof is about 25 or more. Accordingly, it is possible to obtain an electromagnetic wave absorbing sheet which exhibits an excellent electric wave absorption characteristic in which an absorption amount of electromagnetic waves is large in an in-plane direction of the sheet.
    Type: Application
    Filed: June 20, 2008
    Publication date: January 15, 2009
    Inventors: Takao Mizushima, Seiichi Abiko, Kyoichi Kawase, Toshio Takahashi, Satoshi Maruyama
  • Publication number: 20080143625
    Abstract: An antenna sheet includes a magnetic sheet composed of a resin matrix and an Fe-based amorphous alloy contained in the resin matrix, and an antenna pattern disposed directly on the magnetic sheet, the antenna pattern being composed of nanoparticles. The antenna sheet can be manufactured by forming the antenna pattern directly on the magnetic sheet using a material containing nanoparticles, and then by sintering the nanoparticles by subjecting the magnetic sheet having the antenna pattern to heat treatment.
    Type: Application
    Filed: December 4, 2007
    Publication date: June 19, 2008
    Inventors: Takao Mizushima, Hideyuki Takahashi, Akira Sakai
  • Patent number: 7277001
    Abstract: 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: Grant
    Filed: August 16, 2005
    Date of Patent: October 2, 2007
    Assignee: Alps Electric Co., Ltd.
    Inventors: Takao Mizushima, Yutaka Naito, Kazuo Aoki, Hidetaka Kemmotsu, Satoshi Watabe
  • Patent number: 7132019
    Abstract: 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: Grant
    Filed: April 21, 2005
    Date of Patent: November 7, 2006
    Assignee: Alps Electric Co., Ltd.
    Inventors: Hisato Koshiba, Hidetaka Kenmotsu, Yutaka Naito, Takao Mizushima
  • Publication number: 20060038651
    Abstract: 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: Application
    Filed: August 16, 2005
    Publication date: February 23, 2006
    Inventors: Takao Mizushima, Yutaka Naito, Kazuo Aoki, Hidetaka Kemmotsu, Satoshi Watabe
  • Publication number: 20050236071
    Abstract: 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: Application
    Filed: April 21, 2005
    Publication date: October 27, 2005
    Inventors: Hisato Koshiba, Hidetaka Kenmotsu, Yutaka Naito, Takao Mizushima