Patents by Inventor Daichi Azuma

Daichi Azuma 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: 11613101
    Abstract: A magnetic piece, a multilayer magnetic piece and a multilayer core with an adhesive agent of excellent saturation magnetic flux density are provided. The magnetic piece includes a soft magnetic amorphous alloy ribbon 1 and a resin layer 2 provided on at least one surface of the soft magnetic amorphous alloy ribbon. The resin layer contains a resin whose Shore D hardness is not more than 60. The resin may have a Shore D hardness of not more than 25 or may have a Shore D hardness of not less than 1.
    Type: Grant
    Filed: October 25, 2018
    Date of Patent: March 28, 2023
    Assignees: HITACHI METALS, LTD., METGLAS, INC.
    Inventors: Akio Uchikawa, Nakao Moritsugu, Daichi Azuma
  • Patent number: 11244782
    Abstract: An amorphous alloy magnetic core including a layered body in which amorphous alloy thin strips are layered one on another, the layered body having one end face and another end face in a width direction of the amorphous alloy thin strips, an inner peripheral surface and an outer peripheral surface orthogonal to a layering direction of the amorphous alloy thin strips, and a hole passing through from a part of the one end face as a starting point, the width direction corresponding to a depth direction of the hole.
    Type: Grant
    Filed: February 25, 2019
    Date of Patent: February 8, 2022
    Assignee: HITACHI METALS, LTD.
    Inventors: Hitoshi Kodama, Kengo Takahashi, Daichi Azuma
  • Publication number: 20210310097
    Abstract: A method of producing an amorphous alloy ribbon having a composition of Fe100-a-bBaSibCc (13.0 atom %?a?16.0 atom %, 2.5 atom %?b?5.0 atom %, 0.20 atom %?c?0.35 atom %, and 79.0 atom %?(100-a-b)?83.0 atom %) includes: preparing an alloy ribbon; and, in a state in which the alloy ribbon is tensioned with a tensile stress of from 5 MPa to 100 MPa, increasing a temperature of the alloy ribbon to from 410° C. to 480° C., at an average temperature increase rate of from 50° C./sec to less than 800° C./sec, and decreasing a temperature of the thus heated alloy ribbon to a temperature of a heat transfer medium for temperature-decreasing, at an average temperature decrease rate of from 120° C./sec to less than 600° C./sec, with performing the increase and decrease of temperature being performed by contacting the traveling alloy ribbon with a heat transfer medium.
    Type: Application
    Filed: July 3, 2018
    Publication date: October 7, 2021
    Applicants: HITACHI METALS, LTD., METGLAS INC.
    Inventors: Daichi AZUMA, Naoki ITO
  • Publication number: 20210178728
    Abstract: A magnetic piece, a multilayer magnetic piece and a multilayer core with an adhesive agent of excellent saturation magnetic flux density are provided. The magnetic piece includes a soft magnetic amorphous alloy ribbon 1 and a resin layer 2 provided on at least one surface of the soft magnetic amorphous alloy ribbon. The resin layer contains a resin whose Shore D hardness is not more than 60. The resin may have a Shore D hardness of not more than 25 or may have a Shore D hardness of not less than 1.
    Type: Application
    Filed: October 25, 2018
    Publication date: June 17, 2021
    Inventors: Akio UCHIKAWA, Nakao MORITSUGU, Daichi AZUMA
  • Publication number: 20200216926
    Abstract: A method of producing an amorphous alloy having a composition of Fe100-a-bBaSibCc (13.0 atom %?a?16.0 atom %, 2.5 atom %?b?5.0 atom %, 0.20 atom %?c?0.35 atom %, and 79.0 atom %?(100?a?b)?83.0 atom %) includes: preparing an alloy ribbon; and, in a state in which the alloy ribbon is tensioned with a tensile stress of from 20 MPa to 80 MPa, increasing a temperature of the alloy ribbon to from 410° C. to 480° C., at an average temperature increase rate of from 50° C./sec to less than 800° C./sec, and decreasing a temperature of the thus heated alloy ribbon to a temperature of a heat transfer medium for temperature-decreasing, at an average temperature decrease rate of from 120° C./sec to less than 600° C./sec.
    Type: Application
    Filed: July 3, 2018
    Publication date: July 9, 2020
    Applicants: HITACHI METALS, LTD., METGLAS INC.
    Inventors: Naoki ITO, Daichi AZUMA
  • Patent number: 10566127
    Abstract: An Fe—Si—B—C-based amorphous alloy ribbon as thick as 20-30 ?m having a composition comprising 80.0-80.7 atomic % of Fe, 6.1-7.99 atomic % of Si, and 11.5-13.2 atomic % of B, the total amount of Fe, Si and B being 100 atomic %, and further comprising 0.2-0.45 atomic % of C per 100 atomic % of the total amount of Fe, Si and B, except for inevitable impurities has a stress relief degree of 92% or more.
    Type: Grant
    Filed: December 8, 2015
    Date of Patent: February 18, 2020
    Assignees: HITACHI METALS, LTD., METGLAS, INC.
    Inventors: Eric Theisen, Yuichi Ogawa, Daichi Azuma
  • Publication number: 20190189317
    Abstract: An amorphous alloy magnetic core including a layered body in which amorphous alloy thin strips are layered one on another, the layered body having one end face and another end face in a width direction of the amorphous alloy thin strips, an inner peripheral surface and an outer peripheral surface orthogonal to a layering direction of the amorphous alloy thin strips, and a hole passing through from a part of the one end face as a starting point, the width direction corresponding to a depth direction of the hole.
    Type: Application
    Filed: February 25, 2019
    Publication date: June 20, 2019
    Inventors: Hitoshi KODAMA, Kengo TAKAHASHI, Daichi AZUMA
  • Patent number: 10283265
    Abstract: A method of manufacturing an amorphous alloy magnetic core, which includes preparing a layered body by layering amorphous alloy thin strips one on another, and has one end face and another end face in a width direction of the thin strips and an inner peripheral surface and an outer peripheral surface orthogonal to a layering direction of the thin strips; forming a hole passing through from the one end face of the layered body as a starting point; subjecting the layered body to which the hole has been formed to a heat treatment while measuring an internal temperature of the hole; and forming a resin layer which blocks the hole and covers at least a part of the one end face by coating and curing a two-liquid mixed type epoxy resin composition having a viscosity of from 38 Pa·s to 51 Pa·s and a T. I. value of from 1.6 to 2.7 on at least a part of at least the one end face of the layered body after being subjected to the heat treatment.
    Type: Grant
    Filed: September 24, 2015
    Date of Patent: May 7, 2019
    Assignee: HITACHI METALS, LTD.
    Inventors: Hitoshi Kodama, Kengo Takahashi, Daichi Azuma
  • Patent number: 10269476
    Abstract: An amorphous alloy magnetic core including a layered body in which amorphous alloy thin strips are layered one on another, the layered body having one end face and another end face in a width direction of the amorphous alloy thin strips, an inner peripheral surface and an outer peripheral surface orthogonal to a layering direction of the amorphous alloy thin strips, and a hole passing through from a part of the one end face as a starting point, the width direction corresponding to a depth direction of the hole.
    Type: Grant
    Filed: September 24, 2015
    Date of Patent: April 23, 2019
    Assignee: HITACHI METALS, LTD.
    Inventors: Hitoshi Kodama, Kengo Takahashi, Daichi Azuma
  • Patent number: 9978497
    Abstract: The invention provides a wound magnetic core which is configured by winding an Fe-based amorphous alloy ribbon, the wound magnetic core containing a recess row including plural recesses formed by laser irradiation in a central part of the Fe-based amorphous alloy ribbon in a width direction, in which a ratio of a length of the central part to a total width is from 0.2 to 0.8.
    Type: Grant
    Filed: March 12, 2014
    Date of Patent: May 22, 2018
    Assignee: HITACHI METALS, LTD.
    Inventors: Daichi Azuma, Naoki Itoh, Makoto Sasaki, Shinichi Kazui
  • Patent number: 9881735
    Abstract: The present invention provides an Fe-based amorphous transformer magnetic core formed by stacking Fe-based amorphous alloy thin strips and satisfying the following (1) to (3) in a direct current B-H curve measured by applying a magnetic field of 80 A/m to the magnetic core: B80?1.1 T??(1) 0.5 T?Br?0.7 T??(2) B80?Br?0.6 T??(3) wherein B80 represents a magnetic flux density (T) obtained when magnetization is performed in the magnetic field of 80 A/m, and Br represents a residual magnetic flux density (T) obtained when a magnetic field is changed to 0 A/m after magnetization is performed in a magnetic field of 80 A/m.
    Type: Grant
    Filed: August 7, 2014
    Date of Patent: January 30, 2018
    Assignees: HITACHI METALS, LTD., JIBU ELECTRIC CO., LTD.
    Inventors: Daichi Azuma, Yuji Nagata, Kengo Takahashi
  • Publication number: 20170365392
    Abstract: An Fe—Si—B—C-based amorphous alloy ribbon as thick as 20-30 ?m having a composition comprising 80.0-80.7 atomic % of Fe, 6.1-7.99 atomic % of Si, and 11.5-13.2 atomic % of B, the total amount of Fe, Si and B being 100 atomic %, and further comprising 0.2-0.45 atomic % of C per 100 atomic % of the total amount of Fe, Si and B, except for inevitable impurities has a stress relief degree of 92% or more.
    Type: Application
    Filed: December 8, 2015
    Publication date: December 21, 2017
    Applicants: METGLAS, INC., HITACHI METALS, LTD.
    Inventors: Eric THEISEN, Yuichi OGAWA, Daichi AZUMA
  • Publication number: 20170294267
    Abstract: A method of manufacturing an amorphous alloy magnetic core, which includes preparing a layered body by layering amorphous alloy thin strips one on another, and has one end face and another end face in a width direction of the thin strips and an inner peripheral surface and an outer peripheral surface orthogonal to a layering direction of the thin strips; forming a hole passing through from the one end face of the layered body as a starting point; subjecting the layered body to which the hole has been formed to a heat treatment while measuring an internal temperature of the hole; and forming a resin layer which blocks the hole and covers at least a part of the one end face by coating and curing a two-liquid mixed type epoxy resin composition having a viscosity of from 38 Pa·s to 51 Pa·s and a T. I. value of from 1.6 to 2.7 on at least a part of at least the one end face of the layered body after being subjected to the heat treatment.
    Type: Application
    Filed: September 24, 2015
    Publication date: October 12, 2017
    Inventors: Hitoshi KODAMA, Kengo TAKAHASHI, Daichi AZUMA
  • Publication number: 20170294255
    Abstract: An amorphous alloy magnetic core including a layered body in which amorphous alloy thin strips are layered one on another, the layered body having one end face and another end face in a width direction of the amorphous alloy thin strips, an inner peripheral surface and an outer peripheral surface orthogonal to a layering direction of the amorphous alloy thin strips, and a hole passing through from a part of the one end face as a starting point, the width direction corresponding to a depth direction of the hole.
    Type: Application
    Filed: September 24, 2015
    Publication date: October 12, 2017
    Inventors: Hitoshi KODAMA, Kengo TAKAHASHI, Daichi AZUMA
  • Publication number: 20160203902
    Abstract: The present invention provides an Fe-based amorphous transformer magnetic core formed by stacking Fe-based amorphous alloy thin strips and satisfying the following (1) to (3) in a direct current B—H curve measured by applying a magnetic field of 80 A/m to the magnetic core: B80?1.1 T ??(1) 0.5 T?Br?0.7 T ??(2) B80-Br?0.6 T ??(3) wherein B80 represents a magnetic flux density (T) obtained when magnetization is performed in the magnetic field of 80 A/m, and Br represents a residual magnetic flux density (T) obtained when a magnetic field is changed to 0 A/m after magnetization is performed in a magnetic field of 80 A/m.
    Type: Application
    Filed: August 7, 2014
    Publication date: July 14, 2016
    Applicants: HITACHI METALS, LTD., JIBU ELECTRIC CO., LTD.
    Inventors: Daichi AZUMA, Yuji NAGATA, Kengo TAKAHASHI
  • Publication number: 20160172087
    Abstract: An Fe—Si—B—C-based amorphous alloy ribbon as thick as 20-30 ?m having a composition comprising 80.0-80.7 atomic % of Fe, 6.1-7.99 atomic % of Si, and 11.5-13.2 atomic % of B, the total amount of Fe, Si and B being 100 atomic %, and further comprising 0.2-0.45 atomic % of C per 100 atomic % of the total amount of Fe, Si and B, except for inevitable impurities has a stress relief degree of 92% or more.
    Type: Application
    Filed: December 11, 2014
    Publication date: June 16, 2016
    Applicants: METGLAS, INC., HITACHI METALS, LTD.
    Inventors: Eric THEISEN, Yuichi OGAWA, Daichi AZUMA
  • Publication number: 20160035474
    Abstract: The invention provides a wound magnetic core which is configured by winding an Fe-based amorphous alloy ribbon, the wound magnetic core containing a recess row including plural recesses formed by laser irradiation in a central part of the Fe-based amorphous alloy ribbon in a width direction, in which a ratio of a length of the central part to a total width is from 0.2 to 0.8.
    Type: Application
    Filed: March 12, 2014
    Publication date: February 4, 2016
    Applicant: HITACHI METALS, LTD
    Inventors: Daichi AZUMA, Naoki ITOH, Makoto SASAKI, Shinichi KAZUI
  • Patent number: 8968490
    Abstract: A ferromagnetic amorphous alloy ribbon includes an alloy having a composition represented by FeaSibBcCd where 80.5?a?83 at. %, 0.5?b?6 at. %, 12?c?16.5 at. %, 0.01?d?1 at. % with a+b+c+d=100 and incidental impurities, the ribbon being cast from a molten state of the alloy with a molten alloy surface tension of greater than or equal to 1.1 N/m on a chill body surface; the ribbon having a ribbon length, a ribbon thickness, and a ribbon surface facing the chill body surface; the ribbon having ribbon surface protrusions being formed on the ribbon surface facing the chill body surface; the ribbon surface protrusions being measured in terms of a protrusion height and a number of protrusions; the protrusion height exceeding 3 ?m and less than four times the ribbon thickness, and the number of protrusions being less than 10 within 1.5 m of the cast ribbon length; and the alloy ribbon in its annealed straight strip form having a saturation magnetic induction exceeding 1.
    Type: Grant
    Filed: September 9, 2010
    Date of Patent: March 3, 2015
    Assignees: Metglas, Inc., Hitachi Metals, Ltd.
    Inventors: Eric A. Theisen, James Perrozi, Yuichi Ogawa, Yuji Matsumoto, Daichi Azuma, Ryusuke Hasegawa
  • Patent number: 8968489
    Abstract: A ferromagnetic amorphous alloy ribbon, a method of fabricating a ribbon and a wound transformer core are provided. The ribbon includes an alloy of FeaSibBcCd where 80.5?a?83 at. %, 0.5?b?6 at. %, 12?c?16.5 at. %, 0.01?d?1 at. % with a+b+c+d=100, and is cast from a molten state of the alloy, having a-surface tension of greater than or equal to 1.1 N/mi,. A defect length along a direction of the ribbon's length is between 5 mm and 200 mm, a defect depth less than 0.4 ×t ?m and a defect occurrence frequency less than 0.05 ×w times within 1.5 m of ribbon length, where t is the ribbon thickness and w is the ribbon width in mm. The ribbon has a saturation magnetic induction exceeding 1.60 T and a magnetic core loss of less than 0.14 W/kg when measured at 60 Hz and at 1.3 T induction level in an annealed straight strip form, and a core magnetic loss of less than 0.3 W/kg and an exciting power of less than 0.
    Type: Grant
    Filed: August 31, 2010
    Date of Patent: March 3, 2015
    Assignees: Metglas, Inc., Hitachi Metals, Ltd.
    Inventors: Daichi Azuma, Ryusuke Hasegawa, Yuichi Ogawa, Eric A. Theisen, Yuji Matsumoto
  • Publication number: 20150050510
    Abstract: The invention provides an amorphous alloy ribbon consisting of Fe, Si, B, C, and unavoidable impurities, in which a content of Si is from 8.5 atom % to 9.5 atom %, and a content of B is from 10.0 atom % to less than 12.0 atom % when a total content of Fe, Si, and B is 100.0 atom %, a content of C relative to the total content of 100.0 atom % is from 0.2 atom % to 0.6 atom %, and the ribbon has a thickness of from 10 ?m to 40 ?m and a width of from 100 mm to 300 mm.
    Type: Application
    Filed: March 7, 2013
    Publication date: February 19, 2015
    Applicant: HITACHI METALS, LTD.
    Inventors: Takayuki Motegi, Daichi Azuma, Hajime Itagaki, Yoshio Bizen