Patents by Inventor Kazunori Igarashi

Kazunori Igarashi 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: 11183321
    Abstract: The present invention relates to a powder magnetic core with silica-based insulating film having a structure in which a plurality of Fe-based soft magnetic powder particles having surfaces coated with a silica-based insulating film are joined with each other through a grain boundary layer made of the silica-based insulating film. Fe diffused from the Fe-based soft magnetic powder particles is contained in the grain boundary layer and the grain boundary layer contains an oxide of each of Fe and Si or a composite oxide of Fe and Si.
    Type: Grant
    Filed: March 30, 2017
    Date of Patent: November 23, 2021
    Assignee: Diamet Corporation
    Inventors: Hiroaki Ikeda, Kazunori Igarashi
  • Publication number: 20200258667
    Abstract: This silica-based insulator-coated soft magnetic powder is a Fe-based soft magnetic powder of which a surface is coated with a silica-based insulating film, the silica-based insulating film includes a Fe oxide and a Si oxide, and the Fe oxide and the Si oxide satisfy that O(—Fe)/O(—Si) (a ratio of an amount of O in the Fe oxide to an amount of O in the Si oxide in the silica-based insulating film) is 0.05 to 1.0 (at % ratio).
    Type: Application
    Filed: October 2, 2018
    Publication date: August 13, 2020
    Inventors: Hiroaki Ikeda, Kazunori Igarashi
  • Patent number: 10351946
    Abstract: Provided are a sputtering target composed of a Cu—Ga sintered compact that has a further reduced oxygen content and can suppress abnormal discharges, and a method for producing the same. The sintered compact has a component composition containing a Ga content of 20 at % or higher and less than 30 at % with the balance being Cu and inevitable impurities, and has an oxygen content of 100 ppm or lower and an average grain size of 100 ?m or less, and exhibits the diffraction peaks assigned to the ? and ? phases of CuGa as observed in X-ray diffraction, wherein the main peak intensity of the diffraction peaks assigned to the ? phase is 10% or higher relative to that of the diffraction peaks assigned to the ? phase.
    Type: Grant
    Filed: October 7, 2013
    Date of Patent: July 16, 2019
    Assignee: MITSUBISHI MATERIALS CORPORATION
    Inventors: Kazunori Igarashi, Muneaki Watanabe, Yuuki Yoshida, Kouichi Ishiyama, Satoru Mori
  • Publication number: 20190131040
    Abstract: The present invention relates to a powder magnetic core with silica-based insulating film having a structure in which a plurality of Fe-based soft magnetic powder particles having surfaces coated with a silica-based insulating film are joined with each other through a grain boundary layer made of the silica-based insulating film. Fe diffused from the Fe-based soft magnetic powder particles is contained in the grain boundary layer and the grain boundary layer contains an oxide of each of Fe and Si or a composite oxide of Fe and Si.
    Type: Application
    Filed: March 30, 2017
    Publication date: May 2, 2019
    Applicants: MITSUBISHI MATERIALS CORPORATION, Diamet Corporation
    Inventors: Hiroaki IKEDA, Kazunori IGARASHI
  • Patent number: 9773597
    Abstract: A composite soft magnetic material having low magnetostriction and high magnetic flux density contains: pure iron-based composite soft magnetic powder particles that are subjected to an insulating treatment by a Mg-containing insulating film or a phosphate film; and Fe—Si alloy powder particles including 11%-16% by mass of Si. A ratio of an amount of the Fe—Si alloy powder particles to a total amount is in a range of 10%-60% by mass. A method for producing the composite soft magnetic material comprises the steps of: mixing a pure iron-based composite soft magnetic powder, and the Fe—Si alloy powder in such a manner that a ratio of the Fe—Si alloy powder to a total amount is in a range of 10%-60%; subjecting a resultant mixture to compression molding; and subjecting a resultant molded body to a baking treatment in a non-oxidizing atmosphere.
    Type: Grant
    Filed: February 22, 2012
    Date of Patent: September 26, 2017
    Assignees: MITSUBISHI MATERIALS CORPORATION, DIAMET CORPORATION
    Inventors: Hiroaki Ikeda, Hiroshi Tanaka, Kazunori Igarashi
  • Publication number: 20160237551
    Abstract: Provided are a sputtering target composed of a Cu—Ga sintered compact that has a further reduced oxygen content and can suppress abnormal discharges, and a method for producing the same. The sintered compact has a component composition containing a Ga content of 20 at % or higher and less than 30 at % with the balance being Cu and inevitable impurities, and has an oxygen content of 100 ppm or lower and an average grain size of 100 ?m or less, and exhibits the diffraction peaks assigned to the ? and ? phases of CuGa as observed in X-ray diffraction, wherein the main peak intensity of the diffraction peaks assigned to the ? phase is 10% or higher relative to that of the diffraction peaks assigned to the ? phase.
    Type: Application
    Filed: October 7, 2013
    Publication date: August 18, 2016
    Inventors: Kazunori Igarashi, Muneaki Watanabe, Yuuki Yoshida, Kouichi Ishiyama, Satoru Mori
  • Patent number: 9228091
    Abstract: To provide a ferrite thin film-forming composition material that is a composition material for forming a ferrite thin film by using the sol-gel method which can form a thin ferrite thin film having a uniform thickness and, furthermore, has excellent long-term storage stability, a method of forming a ferrite thin film using the above composition material, and a ferrite thin film formed by using the above method. A ferrite thin film-forming composition material is a composition material for forming a NiZn ferrite, CuZn ferrite, or NiCuZn ferrite thin film by using a sol-gel method, in which the composition material is formed by dissolving metallic raw materials in a solvent including acetonitrile, and the fraction of acetonitrile is 30 mass % to 60 mass % with respect to 100 mass % of the composition material.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: January 5, 2016
    Assignee: MITSUBISHI MATERIALS CORPORATION
    Inventors: Toshihiro Doi, Hideaki Sakurai, Kenzo Nakamura, Kazunori Igarashi, Nobuyuki Soyama
  • Publication number: 20140284515
    Abstract: This ferrite thin film-forming composition is a composition for forming a thin film of NiZn ferrite, CuZn ferrite, or NiCuZn ferrite using a sol-gel method, and the composition includes: metal raw materials; and a solvent containing N-methyl pyrrolidone, wherein a ratio of an amount of N-methyl pyrrolidone to 100 mass % of the total amount of the composition is in a range of 30 to 60 mass %.
    Type: Application
    Filed: February 14, 2014
    Publication date: September 25, 2014
    Applicant: MITSUBISHI MATERIALS CORPORATION
    Inventors: Toshihiro Doi, Hideaki Sakurai, Nobuyuki Soyama, Kenzo Nakamura, Kazunori Igarashi
  • Publication number: 20130298730
    Abstract: A composite soft magnetic material having low magnetostriction and high magnetic flux density contains: pure iron-based composite soft magnetic powder particles that are subjected to an insulating treatment by a Mg-containing insulating film or a phosphate film; and Fe—Si alloy powder particles including 11%-16% by mass of Si. A ratio of an amount of the Fe—Si alloy powder particles to a total amount is in a range of 10%-60% by mass. A method for producing the composite soft magnetic material comprises the steps of: mixing a pure iron-based composite soft magnetic powder, and the Fe—Si alloy powder in such a manner that a ratio of the Fe—Si alloy powder to a total amount is in a range of 10%-60%; subjecting a resultant mixture to compression molding; and subjecting a resultant molded body to a baking treatment in a non-oxidizing atmosphere.
    Type: Application
    Filed: February 22, 2012
    Publication date: November 14, 2013
    Applicants: DIAMET CORPORATION, MITSUBISHI MATERIALS CORPORATION
    Inventors: Hiroaki Ikeda, Hiroshi Tanaka, Kazunori Igarashi
  • Publication number: 20130256582
    Abstract: To provide a ferrite thin film-forming composition material that is a composition material for forming a ferrite thin film by using the sol-gel method which can form a thin ferrite thin film having a uniform thickness and, furthermore, has excellent long-term storage stability, a method of forming a ferrite thin film using the above composition material, and a ferrite thin film formed by using the above method. A ferrite thin film-forming composition material is a composition material for forming a NiZn ferrite, CuZn ferrite, or NiCuZn ferrite thin film by using a sol-gel method, in which the composition material is formed by dissolving metallic raw materials in a solvent including acetonitrile, and the fraction of acetonitrile is 30 mass % to 60 mass % with respect to 100 mass % of the composition material.
    Type: Application
    Filed: March 14, 2013
    Publication date: October 3, 2013
    Applicant: MITSUBISHI MATERIALS CORPORATION
    Inventors: Toshihiro Doi, Hideaki Sakurai, Kenzo Nakamura, Kazunori Igarashi, Nobuyuki Soyama
  • Publication number: 20130256585
    Abstract: A method of forming a ferrite thin film by carrying out a process for forming a coated film by coating a ferrite thin film-forming composition on a heat-resistant substrate and a process for calcining the coated film once or a plurality of times so that the thickness of the calcined film on the substrate becomes a desired thickness, and firing the calcined film formed on the substrate, in which the conditions for firing the calcined film formed on the substrate are under the atmosphere or an oxygen gas or inert gas atmosphere, a temperature-rise rate of 1° C./minute to 50° C./minute, a holding temperature of 500° C. to 800° C., and a holding time of 30 minutes to 120 minutes.
    Type: Application
    Filed: March 15, 2013
    Publication date: October 3, 2013
    Applicant: MITSUBISHI MATERIALS CORPORATION
    Inventors: Toshihiro Doi, Hideaki Sakurai, Kenzo Nakamura, Kazunori Igarashi, Nobuyuki Soyama
  • Patent number: 7789077
    Abstract: To prevent dew condensation in a crankcase in a lower part of the crankcase, wherein an oil pan is an integral part of an internal combustion engine, to prevent lubricating oil from being diluted. A crankcase cover covers at least an oil pan out of a crankcase and is provided to the bottom of the crankcase. A heat insulating material is provided between the crankcase and the crankcase cover. A cooling fluid passage for providing a circulation to cool a cylinder or a cylinder head is provided between the crankcase and the crankcase cover. A passage at least one end of which reaches a cylinder head from a crankcase via a cylinder block forms at least a part of a blowby gas passage, is directly provided to the crankcase, the cylinder block and the cylinder head. A flow control valve is arranged in the cylinder block or the cylinder head.
    Type: Grant
    Filed: April 10, 2007
    Date of Patent: September 7, 2010
    Assignee: Honda Motor Co., Ltd.
    Inventors: Kazunori Igarashi, Makoto Ogasawara
  • Patent number: 7575645
    Abstract: The invention provides an Fe—Ni—Mo soft magnetic flaky powder having a component composition of, in percent by mass, Ni: 60 to 90%, Mo: 0.05 to 1.95%, and the balance of Fe and unavoidable impurities, and a flat surface of an average particle size of 30 to 150 ?m, and an aspect ratio (average particle size /average thickness) of 5 to 500; and having a peak intensity ratio I200/I111 within a range between 0.43 and 10, where I200 is the peak height of the face index (200) and I111 is the peak height of the face index (111), in an X-ray diffraction pattern measured in such a manner that the plane including the X-ray incident direction and the diffraction direction is perpendicular to the flat surface of the soft magnetic flaky powder, and the angle between the incident direction and the flat surface is equal to the angle between the diffraction direction and the flat surface.
    Type: Grant
    Filed: August 4, 2004
    Date of Patent: August 18, 2009
    Assignees: Mitsubishi Materials Corporation, JEMCO Inc.
    Inventors: Kazunori Igarashi, Gakuji Uozumi, Yasushi Nayuki, Ryoji Nakayama
  • Patent number: 7497914
    Abstract: The invention provides an Fe—Ni—Mo soft magnetic flaky powder having a component composition of, in percent by mass, Ni: 60 to 90%, Mo: 0.05 to 1.95%, and the balance of Fe and unavoidable impurities, and a flat surface of an average particle size of 30 to 150 ?m, and an aspect ratio (average particle size /average thickness) of 5 to 500; and having a peak intensity ratio I200/I111 within a range between 0.43 and 10, where I200 is the peak height of the face index (200) and I111 is the peak height of the face index (111), in an X-ray diffraction pattern measured in such a manner that the plane including the X-ray incident direction and the diffraction direction is perpendicular to the flat surface of the soft magnetic flaky powder, and the angle between the incident direction and the flat surface is equal to the angle between the diffraction direction and the flat surface.
    Type: Grant
    Filed: August 4, 2004
    Date of Patent: March 3, 2009
    Assignees: Mitsubishi Materials Corporation, Jemco Inc.
    Inventors: Kazunori Igarashi, Gakuji Uozumi, Yasushi Nayuki, Ryoji Nakayama
  • Patent number: 7371271
    Abstract: An object of the present invention is to provide a composite soft magnetic sintered material that has high density, high mechanical strength and high relative magnetic permeability at high frequencies and, in order to achieve this object, the present invention provides a method of producing the composite soft magnetic sintered material, which comprises mixing a composite soft magnetic powder, that consists of iron powder, Fe—Si based soft magnetic iron alloy powder, Fe—Al based soft magnetic iron alloy powder, Fe—Si—Al based soft magnetic iron alloy powder, Fe—Cr based soft magnetic iron alloy powder or nickel-based soft magnetic alloy powder (hereinafter these powders are referred to as soft magnetic metal powder) of which particles arc coated with a ferrite layer which has a spinel structure, with 0.05 to 1.
    Type: Grant
    Filed: March 29, 2002
    Date of Patent: May 13, 2008
    Assignee: Mitsubishi Materials PMG Corporation
    Inventors: Kazunori Igarashi, Ryoji Nakayama, Koichiro Morimoto, Muneaki Watanabe
  • Publication number: 20070245983
    Abstract: To prevent dew condensation in a crankcase in a lower part of the crankcase, wherein an oil pan is an integral part of an internal combustion engine, to prevent lubricating oil from being diluted. A crankcase cover covers at least an oil pan out of a crankcase and is provided to the bottom of the crankcase. A heat insulating material is provided between the crankcase and the crankcase cover. A cooling fluid passage for providing a circulation to cool a cylinder or a cylinder head is provided between the crankcase and the crankcase cover. A passage at least one end of which reaches a cylinder head from a crankcase via a cylinder block forms at least a part of a blowby gas passage, is directly provided to the crankcase, the cylinder block and the cylinder head. A flow control valve is arranged in the cylinder block or the cylinder head.
    Type: Application
    Filed: April 10, 2007
    Publication date: October 25, 2007
    Applicant: HONDA MOTOR CO., LTD.
    Inventors: Kazunori Igarashi, Makoto Ogasawara
  • Publication number: 20070131311
    Abstract: The invention provides an Fe—Ni—Mo soft magnetic flaky powder having a component composition of, in percent by mass, Ni: 60 to 90%, Mo: 0.05 to 1.95%, and the balance of Fe and unavoidable impurities, and a flat surface of an average particle size of 30 to 150 ?m, and an aspect ratio (average particle size /average thickess) of 5 to 500; and having a peak intensity ratio I200/I111 within a range between 0.43 and 10, where I200 is the peak height of the face index (200) and I111 is the peak height of the face index (111), in an X-ray diffraction pattern measured in such a manner that the plane including the X-ray incident direction and the diffraction direction is perpendicular to the flat surface of the soft magnetic flaky powder, and the angle between the incident direction and the flat surface is equal to the angle between the diffraction direction and the flat surface.
    Type: Application
    Filed: August 4, 2004
    Publication date: June 14, 2007
    Inventors: Kazunori Igarashi, Gakuji Uozumi, Yasushi Nayuki, Ryoji Nakayama
  • Publication number: 20040208311
    Abstract: An object of the present invention is to reduce unwanted voice echoed back to the transmitting party in an IP telephone. In order to achieve this object, in the curl cord of the present invention, two microphone lines connected to a differential input type microphone are respectively wired at approximately the same distance from a single speaker line connected to a single end output type speaker. Thereby, noise signals caused by cross-talk to the microphone lines from the speaker line transmitting the voice signal of the transmitting party will be of the same phase and same amplitude. By cancelling out these noise signals by means of common mode rejection in the differential amplifier provided in the base unit, it is possible to reduce the echoing back of unwanted voice to the transmitting party.
    Type: Application
    Filed: June 10, 2003
    Publication date: October 21, 2004
    Applicant: Uniden Corporation
    Inventors: Kazunori Igarashi, Tetsuro Otake, Teruyasu Sugioka
  • Publication number: 20040161600
    Abstract: An object of the present invention is to provide a composite soft magnetic sintered material that has high density, high mechanical strength and high relative magnetic permeability at high frequencies and, in order to achieve this object, the present invention provides a method of producing the composite soft magnetic sintered material, which comprises mixing a composite soft magnetic powder, that consists of iron powder, Fe—Si based soft magnetic iron alloy powder, Fe—Al based soft magnetic iron alloy powder, Fe—Si—Al based soft magnetic iron alloy powder, Fe—Cr based soft magnetic iron alloy powder or nickel-based soft magnetic alloy powder (hereinafter these powders are referred to as soft magnetic metal powder) of which particles arc coated with a ferrite layer which has a spinel structure, with 0.05 to 1.
    Type: Application
    Filed: April 6, 2004
    Publication date: August 19, 2004
    Inventors: Kazunori Igarashi, Ryoji Nakayama, Koichiro Morimoto, Muneaki Watanabe
  • Patent number: 5543070
    Abstract: This invention relates to a magnetic recording powder having a low Curie temperature and a high saturation magnetization (.sigma.s). The magnetic recording powder of this invention is of a composite oxide having a hexagonal ferrite type crystal structure comprises: (a) between 14 and 20 atomic % of at least one of strontium oxide and barium oxide, (b) between 15 and 40 atomic % of chromium oxide, (c) between 2 and 15 atomic % of at least one member of the group consisting of zinc oxide, magnesium oxide and copper oxide, (d) between 2 and 15 atomic % of at least one member of the group consisting of titanium oxide, zirconium oxide and tin oxide, with substantial remainder being iron oxide and unavoidable impurities. Further, the magnetic recording powder of this invention is of a composite oxide having saturation magnetization (.sigma.s) of 15 emu/g or higher, and a Curie temperature (Tc) of 155.degree. C. or lower.
    Type: Grant
    Filed: December 1, 1994
    Date of Patent: August 6, 1996
    Assignee: Mitsubishi Materials Corporation
    Inventors: Kouichi Ishiyama, Kazunori Igarashi, Norikazu Komada, Takuo Takeshita, Kiyoyuki Ookubo