Patents by Inventor Masahito Koeda
Masahito Koeda 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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Patent number: 11705259Abstract: According to an aspect, a soft magnetic metal powder includes a plurality of soft magnetic metal particles containing iron, a surface of each of the soft magnetic metal particles is covered with a coating part, and a maximum height Sz of a surface of the coating part is 10 to 700 nm. According to another aspect, a soft magnetic metal powder includes a plurality of soft magnetic metal particles containing iron, a surface of each of the soft magnetic metal particles is covered with a coating part, and a maximum height Rz of a surface of the coating part is 10 to 700 nm.Type: GrantFiled: September 29, 2020Date of Patent: July 18, 2023Assignee: TDK CORPORATIONInventors: Masahito Koeda, Kazuhiro Yoshidome, Hiroyuki Matsumoto
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Publication number: 20230178275Abstract: A soft magnetic metal powder including a soft magnetic metal particle. The soft magnetic metal particle includes a metal particle and an oxide part covering the metal particle. An interface between the metal particle and the oxide part has roughness. A maximum height Rz of roughness at the interface between the metal particle and the oxide part is within a range of 1.0 nm or more and 50.0 nm or less.Type: ApplicationFiled: November 22, 2022Publication date: June 8, 2023Applicant: TDK CORPORATIONInventors: Masahito KOEDA, Satoko MORI, Kazuhiro YOSHIDOME, Hiroyuki MATSUMOTO
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Patent number: 11569014Abstract: A dust core includes large particles having an average particle size of 8-15 ?m, medium particles having an average particle size of 1-5 ?m, and small particles having an average particle size of 300-900 nm when a cross section thereof is observed. An area ratio occupied by the large particles is 50% to 90%, an area ratio occupied by the medium particles is 0% to 30%, and an area ratio occupied by the small particles is 5% to 30%, when a total area ratio occupied by the large particles, the medium particles and the small particles is 100% in the cross section. Vickers hardness (Hv) of the large particles, the medium particles and the small particles is 150-600 respectively. The small particles are alloy powder containing Fe and at least Si or N. The dust core may be included in an inductor element.Type: GrantFiled: May 17, 2019Date of Patent: January 31, 2023Assignee: TDK CORPORATIONInventors: Hideharu Moro, Akihiro Harada, Masahito Koeda
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Publication number: 20210098164Abstract: According to an aspect, a soft magnetic metal powder includes a plurality of soft magnetic metal particles containing iron, a surface of each of the soft magnetic metal particles is covered with a coating part, and a maximum height Sz of a surface of the coating part is 10 to 700 nm. According to another aspect, a soft magnetic metal powder includes a plurality of soft magnetic metal particles containing iron, a surface of each of the soft magnetic metal particles is covered with a coating part, and a maximum height Rz of a surface of the coating part is 10 to 700 nm.Type: ApplicationFiled: September 29, 2020Publication date: April 1, 2021Applicant: TDK CORPORATIONInventors: Masahito KOEDA, Kazuhiro YOSHIDOME, Hiroyuki MATSUMOTO
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Patent number: 10763019Abstract: A soft magnetic material comprising a soft magnetic metal powder and a resin, wherein the soft magnetic metal powder is constituted from a particle group ? and group ?, when IA is a peak intensity of the particle group ?, IB is a peak intensity of the particle group ?, and IC is a minimum intensity present between the particle group ? and group ?, then an intensity ratio IC/IA satisfies 0.10 or less and an intensity ratio IA/IB satisfies 1.2 or more and 3.0 or less, the particle group ? having a maximum peak intensity in a size distribution of the soft magnetic metal powder, the particle group ? having an peak intensity which is the second largest to the particle group ?, and a peak particle size PA of the particle group ? is larger than a peak particle size PB of the particle group ?.Type: GrantFiled: January 11, 2018Date of Patent: September 1, 2020Assignee: TDK CORPORATIONInventors: Yoshihiro Shinkai, Takashi Kamiya, Masahito Koeda, Kyotaro Abe
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Patent number: 10748688Abstract: A soft magnetic alloy including a composition having a formula of ((Fe(1?(?+?))X1?X2?)(1?(a+b+d+e))MaBbCrdCue)1?fCf. X1 is one or more elements selected from a group of Co and Ni. X2 is one or more elements selected from a group of W, Al, Mn, Ag, Zn, Sn, As, Sb, Bi, N, O, and rare earth elements. M is one or more elements selected from a group of Nb, Hf, Zr, Ta, Ti, Mo, and V. 0.030?a?0.14, 0.028?b?0.15, 0.005?d?0.020, 0<e?0.030, 0?f?0.040, ??0, ??0, and 0??+??0.50 are satisfied.Type: GrantFiled: October 26, 2017Date of Patent: August 18, 2020Assignee: TDK CORPORATIONInventors: Akihiro Harada, Hiroyuki Matsumoto, Kenji Horino, Kazuhiro Yoshidome, Akito Hasegawa, Hajime Amano, Kensuke Ara, Masahito Koeda, Seigo Tokoro
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Patent number: 10573442Abstract: The object of the present invention is to provide the soft magnetic material, the core, and the inductor having high permeability and excellent DC superimposition characteristic. A soft magnetic material comprising a soft magnetic metal powder and a resin, wherein said soft magnetic metal powder is constituted from a particle group ? and a particle group ?, when IA is a peak intensity of the particle group ?, V? is the volume of the particle group ?, IB is a peak intensity of the particle group ?, V? is the volume of the particle group ?, and IC is a minimum intensity present between the particle group ? and the particle group ?, then an intensity ratio IC/IA satisfies 0.12 or less, and a volume ratio V?/V? is 2.0 or more and 5.1 or less.Type: GrantFiled: January 11, 2018Date of Patent: February 25, 2020Assignee: TDK CORPORATIONInventors: Yoshihiro Shinkai, Masahito Koeda, Kyotaro Abe
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Patent number: 10541072Abstract: A soft magnetic alloy includes a main component of Fe. The soft magnetic alloy includes a Fe composition network phase where regions whose Fe content is larger than an average composition of the soft magnetic alloy are linked. The Fe composition network phase contains Fe content maximum points that are locally higher than their surroundings. A virtual-line total distance per 1 ?m3 of the soft magnetic alloy is 10 mm to 25 mm provided that the virtual-line total distance is a sum of virtual lines linking the maximum points adjacent each other. A virtual-line average distance that is an average distance of the virtual lines is 6 nm or more and 12 nm or less.Type: GrantFiled: September 28, 2017Date of Patent: January 21, 2020Assignee: TDK CORPORATIONInventors: Kazuhiro Yoshidome, Hiroyuki Matsumoto, Yu Yonezawa, Syota Goto, Hideaki Yokota, Akito Hasegawa, Masahito Koeda, Seigo Tokoro
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Publication number: 20190355499Abstract: A dust core includes large particles having an average particle size of 8-15 ?m, medium particles having an average particle size of 1-5 ?m, and small particles having an average particle size of 300-900 nm when a cross section thereof is observed. An area ratio occupied by the large particles is 50% to 90%, an area ratio occupied by the medium particles is 0% to 30%, and an area ratio occupied by the small particles is 5% to 30%, when a total area ratio occupied by the large particles, the medium particles and the small particles is 100% in the cross section. Vickers hardness (Hv) of the large particles, the medium particles and the small particles is 150-600 respectively. The small particles are alloy powder containing Fe and at least Si or N. The dust core may be included in an inductor element.Type: ApplicationFiled: May 17, 2019Publication date: November 21, 2019Applicant: TDK CORPORATIONInventors: Hideharu MORO, Akihiro HARADA, Masahito KOEDA
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Publication number: 20180204657Abstract: The soft magnetic material, the core, and the inductor have high permittivity and excellent DC superimposition characteristic. A soft magnetic material comprising a soft magnetic metal powder and a resin, wherein said soft magnetic metal powder is constituted from a particle group ? and a particle group ?, when IA is a peak intensity of the particle group ?, V? is the volume of the particle group ?, IB is a peak intensity of the particle group ?, V? is the volume of the particle group ?, and IC is a minimum intensity present between the particle group ? and the particle group ?, then an intensity ratio IC/IA satisfies 0.12 or less, and a volume ratio V?/V? is 2.0 or more and 5.1 or less.Type: ApplicationFiled: January 11, 2018Publication date: July 19, 2018Applicant: TDK CORPORATIONInventors: Yoshihiro SHINKAI, Masahito KOEDA, Kyotaro ABE
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Publication number: 20180197666Abstract: A soft magnetic material comprising a soft magnetic metal powder and a resin, wherein the soft magnetic metal powder is constituted from a particle group ? and group ?, when IA is a peak intensity of the particle group ?, IB is a peak intensity of the particle group ?, and IC is a minimum intensity present between the particle group ? and group ?, then an intensity ratio IC/IA satisfies 0.10 or less and an intensity ratio IA/IB satisfies 1.2 or more and 3.0 or less, the particle group ? having a maximum peak intensity in a size distribution of the soft magnetic metal powder, the particle group ? having an peak intensity which is the second largest to the particle group ?, and a peak particle size PA of the particle group ? is larger than a peak particle size PB of the particle group ?.Type: ApplicationFiled: January 11, 2018Publication date: July 12, 2018Applicant: TDK CORPORATIONInventors: Yoshihiro SHINKAI, Takashi KAMIYA, Masahito KOEDA, Kyotaro ABE
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Publication number: 20180122543Abstract: A soft magnetic alloy including a composition having a formula of ((Fe(1?(?+?))X1?X2?)(1?(a+b+d+e))MaBbCrdCue)1?fCf. X1 is one or more elements selected from a group of Co and Ni. X2 is one or more elements selected from a group of W, Al, Mn, Ag, Zn, Sn, As, Sb, Bi, N, O, and rare earth elements. M is one or more elements selected from a group of Nb, Hf, Zr, Ta, Ti, Mo, and V. 0.030?a?0.14, 0.028?b?0.15, 0.005?d?0.020, 0<e?0.030, 0?f?0.040, ??0, ??0, and 0??+??0.50 are satisfied.Type: ApplicationFiled: October 26, 2017Publication date: May 3, 2018Applicant: TDK CORPORATIONInventors: Akihiro HARADA, Hiroyuki MATSUMOTO, Kenji HORINO, Kazuhiro YOSHIDOME, Akito HASEGAWA, Hajime AMANO, Kensuke ARA, Masahito KOEDA, Seigo TOKORO
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Publication number: 20180122540Abstract: A soft magnetic alloy including a composition having a formula of ((Fe(1-(?+?))X1?X2?)(1-(a+b+c+d+e))MaBbPcCrdCue)1-fCf. X1 is one or more elements selected from a group of Co and Ni. X2 is one or more elements selected from a group of W, Al, Mn, Ag, Zn, Sn, As, Sb, Bi, N, O, and rare earth elements. M is one or more elements selected from a group of Nb, Hf, Zr, Ta, Ti, Mo, and V. 0.020?a?0.060, 0.020?b?0.060, 0?c?0.030, 0?d?0.050, 0?e?0.030, 0<f?0.040, ??0, ??0, and 0??+??0.50 are satisfied.Type: ApplicationFiled: October 26, 2017Publication date: May 3, 2018Applicant: TDK CORPORATIONInventors: Hiroyuki MATSUMOTO, Kenji HORINO, Kazuhiro YOSHIDOME, Akihiro HARADA, Akito HASEGAWA, Hajime AMANO, Kensuke ARA, Masahito KOEDA, Seigo TOKORO
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Publication number: 20180122542Abstract: A soft magnetic alloy including a composition having a formula of ((Fe(1-(?+?))X1?X2?)(1-(a+b+c+d+e))MaBbPcCrdCue)1-fCf. X1 is one or more elements selected from a group of Co and Ni. X2 is one or more elements selected from a group of W, Al, Mn, Ag, Zn, Sn, As, Sb, Bi, N, O, and rare earth elements. M is one or more elements selected from a group of Nb, Hf, Zr, Ta, Ti, Mo, and V. 0.030?a?0.14, 0.028?b?0.20, 0<c?0.014, 0<d?0.040, 0?e?0.030, 0?f?0.040, ??0, ??0, and 0??+??0.50 are satisfied.Type: ApplicationFiled: October 26, 2017Publication date: May 3, 2018Applicant: TDK CORPORATIONInventors: Hiroyuki MATSUMOTO, Kenji HORINO, Kazuhiro YOSHIDOME, Akihiro HARADA, Akito HASEGAWA, Hajime AMANO, Kensuke ARA, Masahito KOEDA, Seigo TOKORO
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Publication number: 20180096765Abstract: A soft magnetic alloy includes a main component of Fe. The soft magnetic alloy includes a Fe composition network phase where regions whose Fe content is larger than an average composition of the soft magnetic alloy are linked. The Fe composition network phase contains Fe content maximum points that are locally higher than their surroundings in 400,000/?m3 or more. A ratio of Fe content maximum points whose coordination number is 1 or more and 5 or less is 80% or more and 100% or less with respect to all of the Fe content maximum points.Type: ApplicationFiled: September 28, 2017Publication date: April 5, 2018Applicant: TDK CORPORATIONInventors: Kazuhiro YOSHIDOME, Hiroyuki MATSUMOTO, Yu YONEZAWA, Syota GOTO, Hideaki YOKOTA, Akito HASEGAWA, Masahito KOEDA, Seigo TOKORO
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Publication number: 20180096766Abstract: A soft magnetic alloy includes a main component of Fe. The soft magnetic alloy includes a Fe composition network phase where regions whose Fe content is larger than an average composition of the soft magnetic alloy are linked. The Fe composition network phase contains Fe content maximum points that are locally higher than their surroundings. A virtual-line total distance per 1 ?m3 of the soft magnetic alloy is 10 mm to 25 mm provided that the virtual-line total distance is a sum of virtual lines linking the maximum points adjacent each other. A virtual-line average distance that is an average distance of the virtual lines is 6 nm or more and 12 nm or less.Type: ApplicationFiled: September 28, 2017Publication date: April 5, 2018Applicant: TDK CORPORATIONInventors: Kazuhiro YOSHIDOME, Hiroyuki MATSUMOTO, Yu YONEZAWA, Syota GOTO, Hideaki YOKOTA, Akito HASEGAWA, Masahito KOEDA, Seigo TOKORO
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Patent number: 9245676Abstract: Provided are a soft magnetic alloy powder, a compact made from the soft magnetic alloy powder, a powder magnetic core including the compact, and a magnetic element including the powder magnetic core. The soft magnetic alloy powder contains Fe—Ni-based particles containing 38% to 48% by mass Ni, 1.0% to 15% by mass Co, and 1.2% to 10% by mass Si relative to the total mass of Fe, Ni, Co, and Si, the remainder being Fe. The Fe—Ni-based particles have an average size of more than 1 ?m to less than 10 ?m.Type: GrantFiled: November 28, 2012Date of Patent: January 26, 2016Assignee: TDK CORPORATIONInventors: Masahito Koeda, Yoshihiro Shinkai, Tomofumi Kuroda
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Patent number: 8252124Abstract: The present invention provides a powder magnetic core low in the loss and high in the saturation magnetic flux density and a method for manufacturing the same. More specifically, the present invention provides a powder magnetic core that comprises a soft magnetic metal powder having an average particle size (D50) of 0.5 to 5 ?m, a half width of diffraction peak in a <110> direction of ?-Fe as measured by X-ray powder diffraction of 0.2 to 5.0°, and an Fe content of 97.0% by mass or more, the core having an oxygen content of 2.0% by mass or more.Type: GrantFiled: March 11, 2011Date of Patent: August 28, 2012Assignee: TDK CorporationInventors: Masahito Koeda, Tomofumi Kuroda, Tomokazu Ishikura, Akihiro Harada, Hiroyuki Ono, Osamu Kido, Satoko Ueda
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Publication number: 20110227679Abstract: The present invention provides a powder magnetic core low in the loss and high in the saturation magnetic flux density and a method for manufacturing the same. More specifically, the present invention provides a powder magnetic core that comprises a soft magnetic metal powder having an average particle size (D50) of 0.5 to 5 ?m, a half width of diffraction peak in a <110> direction of ?-Fe as measured by X-ray powder diffraction of 0.2 to 5.0°, and an Fe content of 97.0% by mass or more, the core having an oxygen content of 2.0% by mass or more.Type: ApplicationFiled: March 11, 2011Publication date: September 22, 2011Applicant: TDK CORPORATIONInventors: Masahito KOEDA, Tomofumi KURODA, Tomokazu ISHIKURA, Akihiro HARADA, Hiroyuki ONO, Osamu KIDO, Satoko UEDA
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Publication number: 20110101262Abstract: The invention provides surface-treated reduced iron powder from which a powder magnetic core can be produced so that the powder magnetic core has small core loss and small frequency-dependence of the core loss and exhibits small core loss even when driven at high frequencies of 1 MHz or more. The surface-treated reduced iron powder is obtained by at least surface-treating reduced iron powder prepared by a reduction and slow oxidation method, and contains secondary particles formed through agglomeration of primary particles, the primary particles having an average particle diameter of 0.01-5 ?m. The secondary particles have a D90% particle diameter of 20 ?m or less, the surface of the primary particles is at least in part coated with an insulating layer containing iron phosphate, and the phosphorus content is 500-10000 ppm.Type: ApplicationFiled: October 1, 2010Publication date: May 5, 2011Applicant: TDK CORPORATIONInventors: Tomofumi KURODA, Masahito KOEDA