Patents by Inventor Kazuhiro YOSHIDOME
Kazuhiro YOSHIDOME 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: 12211634Abstract: A soft magnetic alloy or the like combines high saturated magnetic flux density, low coercive force and high magnetic permeability ??. A soft magnetic alloy having the composition formula (Fe(1?(?+?))X1?X2?)(1?(a+b+c+d+e))BaSibCcCudMe. X1 is one or more elements selected from the group consisting of Co and Ni, X2 is one or more elements selected from the group consisting of Al, Mn, Ag, Zn, Sn, As, Sb, Bi, N, O and rare earth elements, and M is one or more elements selected from the group consisting of Nb, Hf, Zr, Ta, Ti, Mo, ?? and V. 0.090?a?0.240, 0.030.Type: GrantFiled: August 21, 2018Date of Patent: January 28, 2025Assignee: TDK CORPORATIONInventors: Akihiro Harada, Akito Hasegawa, Kazuhiro Yoshidome, Kenji Horino, Hiroyuki Matsumoto
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Patent number: 12165794Abstract: A soft magnetic alloy has a main component of Fe. The soft magnetic alloy contains P. A Fe-rich phase and a Fe-poor phase are contained. An average concentration of P in the Fe-poor phase is 1.5 times or larger than an average concentration of P in the soft magnetic alloy by number of atoms.Type: GrantFiled: January 29, 2019Date of Patent: December 10, 2024Assignee: TDK CORPORATIONInventors: Kazuhiro Yoshidome, Hiroyuki Matsumoto, Kenji Horino, Akito Hasegawa, Syota Goto, Masakazu Hosono, Hajime Amano, Isao Nakahata
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Patent number: 12159743Abstract: The object of the present invention is to provide an alloy ribbon capable of having excellent adhesiveness between the alloy ribbons when a plurality of the alloy ribbons is stacked; and also, to provide a magnetic core using the alloy ribbon. The present invention is an alloy ribbon comprising metals scattered on at least one surface of the alloy ribbon, in which diameters of the scattered metals are 1 ?m or more, and the scattered metals include Cu.Type: GrantFiled: March 23, 2021Date of Patent: December 3, 2024Assignee: TDK CORPORATIONInventors: Kyotaro Abe, Takuya Tsukahara, Isao Nakahata, Kazuhiro Yoshidome
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Patent number: 12151288Abstract: A metal powder producing apparatus includes a molten metal supply unit, a cylinder body, and a cooling liquid introduction unit. The molten metal supply unit discharges a molten metal. The cylinder body is capable of being formed with a layer of a cooling liquid for cooling the molten metal on an inner circumference surface of the cylinder body. The cooling liquid introduction unit supplies the cooling liquid to an upper inside of the cylinder body. The inner circumference surface of the upper inside of the cylinder body has a substantially elliptical shape.Type: GrantFiled: September 14, 2022Date of Patent: November 26, 2024Assignee: TDK CORPORATIONInventors: Masakazu Hosono, Kazuhiro Yoshidome, Yoshiki Kajiura, Hiroyuki Matsumoto
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Patent number: 12080457Abstract: Provided is a soft magnetic alloy including a Fe-based nanocrystal and metallic glass. A differential scanning calorimetry curve of the soft magnetic alloy has a glass transition point Tg, a temperature rising rate of the soft magnetic alloy in measurement of the differential scanning calorimetry curve is 40 K/minute, and a temperature Tp of a maximum exothermic peak in the differential scanning calorimetry curve is higher than the Tg.Type: GrantFiled: September 22, 2020Date of Patent: September 3, 2024Assignee: TDK CorporationInventors: Hironobu Kumaoka, Akito Hasegawa, Kazuhiro Yoshidome, Hiroyuki Matsumoto
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Patent number: 12062473Abstract: A soft magnetic alloy including an internal area having a soft magnetic type alloy composition including Fe and Co, a Co concentrated area existing closer to a surface side than the internal area and having a higher Co concentration than in the internal area, and a Co concentration degree of the Co concentrated area is larger than 1.2.Type: GrantFiled: March 17, 2022Date of Patent: August 13, 2024Assignee: TDK CORPORATIONInventors: Hironobu Kumaoka, Kazuhiro Yoshidome, Akito Hasegawa, Satoko Mori
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Patent number: 12062475Abstract: To provide a soft magnetic alloy or the like, from which a magnetic component having a good temperature property of core loss can be obtained. The soft magnetic alloy includes Fe. The soft magnetic alloy includes a crystallite, and an amorphous phase existing around the crystallite. A total area ratio of the crystallite in a cross section of the soft magnetic alloy is 40% or more and less than 60%. An average thickness of the amorphous phase is 3.0 nm or more and 10.0 nm or less. A standard deviation of a thickness of the amorphous phase is 10.0 nm or less.Type: GrantFiled: March 24, 2022Date of Patent: August 13, 2024Assignee: TDK CORPORATIONInventors: Takuya Tsukahara, Isao Nakahata, Kazuhiro Yoshidome
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Patent number: 12062474Abstract: A soft magnetic alloy powder includes a particle body and a surface layer. The particle body comprises a soft magnetic alloy including Fe and Co. The surface layer is located on a surface side of the particle body. The surface layer includes one or more local maximum points of Si concentration and one or more local maximum points of Co concentration. The surface layer satisfies DSi?DCo, in which DSi is a distance from an interface between the particle body and the surface layer to a first Si local maximum point LSimax, and DCo is a distance from the interface to a first Co local maximum point LComax.Type: GrantFiled: October 18, 2022Date of Patent: August 13, 2024Assignee: TDK CORPORATIONInventors: Akito Hasegawa, Satoko Mori, Kazuhiro Yoshidome
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Publication number: 20240177902Abstract: Provided is a magnetic core containing metal magnetic particles. A total area ratio occupied by the metal magnetic particles on a cross-section of the magnetic core is 75% or more. The metal magnetic particles include first large particles having an amorphous structure and having a Heywood diameter of 3 ?m or more on the cross-section of the magnetic core, and second large particles having a nanocrystal structure and having a Heywood diameter of 3 ?m or more on the cross-section of the magnetic core. An insulation coating of the first large particles is thicker than an insulation coating of the second large particles.Type: ApplicationFiled: July 25, 2023Publication date: May 30, 2024Applicant: TDK CORPORATIONInventors: Kazuhiro YOSHIDOME, Kensuke ARA
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Publication number: 20240177898Abstract: A soft magnetic powder includes Fe and Co. The total content of Fe and Co with respect to the soft magnetic powder overall is 90 mass % or greater. The Fe content with respect to the total content of Fe and Co is 30-95 mass %. The average particle diameter of the soft magnetic powder is 0.10-5.0 ?m. The amount of oxygen on the surface of the soft magnetic powder is 0.010 g/m2 or less. The true density of the soft magnetic powder with respect to the theoretical density of the soft magnetic powder is 90-99%.Type: ApplicationFiled: February 25, 2022Publication date: May 30, 2024Applicant: TDK CORPORATIONInventors: Nobuhiro OKUDA, Hiroyuki MATSUMOTO, Kazuhiro YOSHIDOME
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Patent number: 11993833Abstract: Provided is a soft magnetic metal powder including a plurality of soft magnetic metal particles. Each of the soft magnetic metal particles includes a metal particle and an oxidized part covering the metal particle. The metal particle includes at least Fe. The oxidized part includes at least one kind of element of S and an element M. The element M is at least one kind of element selected from the group consisting of Nb, Ta, W, Zr, Hf, and Cr. A unit of a concentration of each of S and the element M in the metal particle and the oxidized part is atom %. The concentration of S or the element M in the metal particle and the oxidized part has a maximum value in the oxidized part.Type: GrantFiled: July 27, 2020Date of Patent: May 28, 2024Assignee: TDK CorporationInventors: Satoko Mori, Kazuhiro Yoshidome, Akito Hasegawa, Hiroyuki Matsumoto
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Patent number: 11990272Abstract: To obtain a magnetic core having an improved relative magnetic permeability and an improved withstand voltage property and the like. The magnetic core contains large particles observed as soft magnetic particles having a Heywood diameter of 5 ?m or more and 25 ?m or less and small particles observed as soft magnetic particles having a Heywood diameter of 0.5 ?m or more and 3 ?m or less in a cross section. 1.00?A1?1.50, 1.30?A2?2.50, and A1?A2 are satisfied, in which an average aspect ratio of the large particles is A1 and an average aspect ratio of the small particles is A2.Type: GrantFiled: March 23, 2021Date of Patent: May 21, 2024Assignee: TDK CORPORATIONInventors: Kazuhiro Yoshidome, Hiroyuki Matsumoto
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Publication number: 20240145134Abstract: A polymer particle containing magnetic material includes a core and a polymer layer. The core includes magnetic fine particles. The polymer layer is located outside the core and surrounds the core. A shape ratio (Ric) is defined in each of the magnetic fine particles by dividing a diameter (Di) of an inscribed circle of the magnetic fine particle by a diameter (Do) of a circumscribed circle of the magnetic fine particle. The shape ratio (Ric) of the magnetic fine particle is 0.50 or more and 0.94 or less. The diameter (Di) of the magnetic fine particle is 5 nm or more. The diameter (Di) and the shape ratio (Ric) of the magnetic fine particle satisfy a relation formula of Di?9.28×e{circumflex over (?)}(1.17×Ric).Type: ApplicationFiled: February 27, 2023Publication date: May 2, 2024Applicant: TDK CORPORATIONInventors: Toshiki GUSHI, Kazuhiro YOSHIDOME, Akito HASEGAWA, Isao KANADA
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Patent number: 11972884Abstract: A soft magnetic alloy includes a main component of (Fe(1?(?+?))X1?X2?)(1?(a+b+c+d+e))MaBbPcSidCe. X1 is one or more of Co and Ni. X2 is one or more of Al, Mn, Ag, Zn, Sn, As, Sb, Cu, Cr, Bi, N, O, and rare earth elements. M is one or more of Nb, Hf, Zr, Ta, Mo, W, and V. 0.020?a?0.14 is satisfied. 0.020<b?0.20 is satisfied. 0?d?0.060 is satisfied. ??0 is satisfied. ??0 is satisfied. 0??+??0.50 is satisfied. c and e are within a predetermined range. The soft magnetic alloy has a nanohetero structure or a structure of Fe based nanocrystallines.Type: GrantFiled: January 10, 2019Date of Patent: April 30, 2024Assignee: TDK CORPORATIONInventors: Kazuhiro Yoshidome, Akihiro Harada, Hiroyuki Matsumoto, Kenji Horino, Akito Hasegawa, Kensuke Ara, Hajime Amano, Masakazu Hosono
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Publication number: 20240079165Abstract: A soft magnetic powder including a first particle group including particles having a particle size of D50 or more and a second particle group including particles having a particle size of less than D50. An average value of circularities of the particles belonging to the first particle group is defined as a first average circularity C1, and an average value of circularities of the particles belonging to the second particle group is defined as a second average circularity C2, and C1<C2 is satisfied.Type: ApplicationFiled: August 29, 2023Publication date: March 7, 2024Applicant: TDK CORPORATIONInventors: Yuta NAKAGAWA, Kazuhiro YOSHIDOME, Isao NAKAHATA
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Publication number: 20240071660Abstract: A soft magnetic alloy powder comprises a component having a compositional formula ((Fe(1?(?+?))Co?Ni?)(1??)X1?)(1?(a+b+c+d+e))BaPbSicCdCre in atomic ratio. X1 comprises at least one selected from specific elements. Values of a, b, c, d, e, ?, ?, and ? of the compositional formula satisfy specific ranges. The soft magnetic alloy powder comprises soft magnetic alloy particles including soft magnetic alloy particles having a particle size of (0.95×D90) or more and (1.05×D90) or less. An average Wadell's circularity of the soft magnetic alloy particles having the particle size of (0.95×D90) or more and (1.05×D90) or less is 0.75 or more. A variance of Wadell's circularity of the soft magnetic alloy particles having the particle size of (0.95×D90) or more and (1.05×D90) or less is 0.035 or less.Type: ApplicationFiled: August 30, 2023Publication date: February 29, 2024Applicant: TDK CORPORATIONInventors: Akito HASEGAWA, Yoshiki KAJIURA, Masakazu HOSONO, Kazuhiro YOSHIDOME
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Publication number: 20240071663Abstract: A soft magnetic alloy powder comprises first particles to fifth particles, each having a particle size within a specific range. Among the first particles to the fifth particles, nth particles have an average particle size xn (?m), an average circularity yn, and a variance zn of circularity, where nth is any ordinal number from first to fifth. Points (xn, yn) (n=1 to 5) plotted in an xy plane define an approximate straight line having a slope “my” of ?0.0030 or more. Points (xn, zn) (n=1 to 5) plotted in an xz plane define an approximate straight line having a slope “mz” of 0.00050 or less.Type: ApplicationFiled: August 30, 2023Publication date: February 29, 2024Applicant: TDK CORPORATIONInventors: Masakazu HOSONO, Kazuhiro YOSHIDOME, Akito HASEGAWA, Yoshiki KAJIURA
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Publication number: 20240047109Abstract: Provided is a magnetic core in which metal magnetic particles occupy an area of 75% to 90% on a cross-section. The metal magnetic particles include first large particles having a crystalline metal material and having a Heywood diameter of 3 ?m or more on the cross-section of the magnetic core, and second large particles having a nanocrystal structure or an amorphous structure and having a Heywood diameter of 3 ?m or more, and an insulation coating of the first large particles is thicker than an insulation coating of the second large particles.Type: ApplicationFiled: July 25, 2023Publication date: February 8, 2024Applicant: TDK CORPORATIONInventors: Kazuhiro YOSHIDOME, Kensuke ARA
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Patent number: 11894169Abstract: Disclosed is a soft magnetic powder including a main component represented by composition formula: (Fe(1?(?+?))X1?X2?)(1?(a+b+c+d+e+f))MaBbPcSidCeSf. X1 represents one or more selected from the group consisting of Co and Ni; X2 represents one or more selected from the group consisting of Al, Mn, Ag, Zn, Sn, As, Sb, Cu, Cr, Bi, N, and rare earth elements; and M represents one or more selected from the group consisting of Nb, Hf, Zr, Ta, Mo, W, Ti, and V. The following relations are satisfied: 0?a?0.140; 0.020<b?0.200; 0<c?0.150; 0?d?0.060; 0?e?0.030; 0?f?0.010; ??0; ??0; and 0??+??0.50. An oxygen content ratio in the soft magnetic powder is from 300 ppm to 3,000 ppm as a mass ratio.Type: GrantFiled: May 16, 2019Date of Patent: February 6, 2024Assignee: TDK CORPORATIONInventors: Kazuhiro Yoshidome, Hiroyuki Matsumoto, Kenji Horino, Satoko Mori, Masakazu Hosono, Yoshiki Kajiura
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Publication number: 20240038433Abstract: Provided is a magnetic core in which metal magnetic particles occupy an area of 75% to 90% on a cross-section. The metal magnetic particles include first large particles having a nanocrystal structure and having a Heywood diameter of 3 ?m or more on the cross-section of the magnetic core, and second large particles having an amorphous structure and having a Heywood diameter of 3 ?m or more, and an insulation coating of the first large particles is thicker than an insulation coating of the second large particles.Type: ApplicationFiled: July 25, 2023Publication date: February 1, 2024Applicant: TDK CORPORATIONInventors: Kazuhiro YOSHIDOME, Kensuke ARA