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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Publication number: 20210020342Abstract: Provided is a soft magnetic alloy which has high saturation flux density and low coercivity and is represented by the compositional formula (Fe(1?(?+?))X1?X2?)(1?(a+b+c+d+e+f))MaPbSicCudX3eBf, wherein X1 is at least one element selected from the group consisting of Co and Ni, X2 is at least one element selected from the group consisting of Ti, V, Mn, Ag, Zn, Al, Sn, As, Sb, Bi, and rare earth elements, X3 is at least one element selected from the group consisting of C and Ge, and M is at least one element selected from the group consisting of Zr, Nb, Hf, Ta, Mo, and W, and wherein 0.030?a?0.120, 0.010?b?0.150, 0?c?0.050, 0?d?0.020, 0?e?0.100, 0?f?0.030, ??0, ??0, and 0??+??0.55.Type: ApplicationFiled: February 15, 2019Publication date: January 21, 2021Applicant: TDK CORPORATIONInventors: Hajime AMANO, Akihiro HARADA, Kenji HORINO, Hiroyuki MATSUMOTO, Kazuhiro YOSHIDOME, Akito HASEGAWA, Kensuke ARA, Masakazu HOSONO
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Publication number: 20210005364Abstract: A magnetic core and the like having a stable soft magnetic property, including a plurality of soft magnetic layers which are laminated, wherein a crack is formed in the soft magnetic layers. The soft magnetic layers include Fe as a principal component. The soft magnetic layers include a composition formula (Fe(1?(?+?))X1?X2?)(1?(a+b+c+d+e+f))MaBbPcSidCeSf, wherein: X1 is one or more selected from the group consisting of Co and Ni, X2 is one or more selected from the group consisting of Al, Mn, Ag, Zn, Sn, As, Sb, Cu, Cr, Bi, N, and O and rare-earth elements, M is one or more selected from the group consisting of Nb, Hf, Zr, Ta, Mo, V, and W; and a to f and ? and ? are in predetermined ranges. A structure including a nanoheterostructure or an Fe-group nanocrystal is observed in the soft magnetic layers.Type: ApplicationFiled: March 1, 2019Publication date: January 7, 2021Applicant: TDK CORPORATIONInventors: Isao NAKAHATA, Kazuhiro YOSHIDOME, Hiroyuki MATSUMOTO, Akito HASEGAWA
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Publication number: 20200377982Abstract: Provided is a soft magnetic alloy which has high saturation flux density, low coercivity, and a high specific resistance, and is represented by the compositional formula (Fe(1?(?+?))X1?X2?)(1?(a+b+c+d+e))MaSibCucX3dBe, wherein X1 is at least one element selected from the group consisting of Co and Ni, X2 is at least one element selected from the group consisting of Ti, V, Mn, Ag, Zn, Al, Sn, As, Sb, Bi, and rare earth elements, X3 is at least one element selected from the group consisting of C and Ge, and M is at least one element selected from the group consisting of Zr, Nb, Hf, Ta, Mo, and W, and wherein 0.030?a?0.120, 0.020?b?0.175, 0?c?0.020, 0?d?0.100, 0?e?0.030, ??0, ??0, and 0??+??0.55).Type: ApplicationFiled: February 15, 2019Publication date: December 3, 2020Applicant: TDK CORPORATIONInventors: Hajime AMANO, Akihiro HARADA, Kazuhiro YOSHIDOME, Kenji HORINO, Hiroyuki MATSUMOTO, Kensuke ARA, Akito HASEGAWA, Seigo TOKORO
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Patent number: 10854365Abstract: Provided is a soft magnetic alloy including Fe, as a main component, and including B. Among 80000 pieces of a grid having 1 nm×1 nm×1 nm in a continuous measurement range of the soft magnetic alloy, 4000 pieces of the grid from lower Fe content shows B content variation (?B) of 2.8 or more, and an amorphization ratio X of the soft magnetic alloy of 85% or more.Type: GrantFiled: February 26, 2018Date of Patent: December 1, 2020Assignee: TDK CORPORATIONInventors: Kazuhiro Yoshidome, Hiroyuki Matsumoto, Kenji Horino, Akito Hasegawa, Yu Yonezawa, Syota Goto, Seigo Tokoro
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Patent number: 10847292Abstract: A soft magnetic alloy is composed of a Fe-based nanocrystal and an amorphous phase. In the soft magnetic alloy, S2-S1>0 is satisfied, where S1 (at %) denotes an average content rate of Si in the Fe-based nanocrystal and S2 (at %) denotes an average content rate of Si in the amorphous phase. In addition, the soft magnetic alloy has a composition formula of ((Fe(1?(?+?))X1?X2?)(1?(a+b+c+d+e+f))MaBbSicPdCreCuf)1?gCg. X1 is one or more selected from the group consisting of Co and Ni, X2 is one or more selected from the group consisting of Al, Mn, Ag, Zn, Sn, As, Sb, Bi, N, O, S and a rare earth element, and M is one or more selected from the group consisting of Nb, Hf, Zr, Ta, Ti, Mo, V and W. In the composition formula, a to g, ? and ? are in specific ranges.Type: GrantFiled: August 6, 2018Date of Patent: November 24, 2020Assignee: TDK CORPORATIONInventors: Kazuhiro Yoshidome, Akito Hasegawa, Hiroyuki Matsumoto, Kenji Horino, Akihiro Harada, Syota Goto, Isao Nakahata
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Publication number: 20200362442Abstract: A soft magnetic alloy thin strip which has high saturation magnetic flux density and low coercivity, which enables a core with high space factor and high saturation magnetic flux density. A soft magnetic alloy thin strip including a main component that has a composition formula (Fe(1?(?+?))X1?X2?)(1?(a+b+c+d+e+f))MaBbPcSidCeSf. In the formula, X1, X2 and M are selected from a specific element group; 0?a?0.140, 0.020?b?0.200, 0?c?0.150, 0?d?0.090, 0?e?0.030, 0?f?0.030, ??0, ??0, and 0??+??0.50; and at least one of a, c and d is larger than 0. The strip has a structure that is composed of an Fe-based nanocrystal; and the surface roughness of a release surface satisfies 0.85?Rae/Rac?1.25 (wherein Rac is the average of arithmetic mean roughnesses in the central portion, and Rae is the average in the edge portion).Type: ApplicationFiled: December 3, 2018Publication date: November 19, 2020Applicant: TDK CORPORATIONInventors: Akito HASEGAWA, Hironobu KUMAOKA, Kazuhiro YOSHIDOME, Hiroyuki MATSUMOTO, Kenji HORINO, Isao NAKAHATA
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Publication number: 20200357546Abstract: 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.Type: ApplicationFiled: August 21, 2018Publication date: November 12, 2020Applicant: TDK CORPORATIONInventors: Akihiro HARADA, Akito HASEGAWA, Kazuhiro YOSHIDOME, Kenji HORINO, Hiroyuki MATSUMOTO
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Publication number: 20200357547Abstract: A soft magnetic alloy or the like combining high saturated magnetic flux density, low coercive force and high magnetic permeability ?? having the composition formula (Fe(1?(?+?))X1?X2?)(1?(a+b+c+d+e))BaSibCcCudMe. X1 is one 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, W and V. 0.140<a?0.240, 0?b?0.030, 0<c<0.080, 0<d?0.020, 0?e?0.030, ??0, ??0, and 0??+??0.50 are satisfied.Type: ApplicationFiled: August 21, 2018Publication date: November 12, 2020Applicant: TDK CORPORATIONInventors: Akihiro HARADA, Akito HASEGAWA, Kazuhiro YOSHIDOME, Kenji HORINO, Hiroyuki MATSUMOTO
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Publication number: 20200306831Abstract: A soft magnetic metal powder that has low coercivity Hcj and high saturation magnetic flux density Bs, and has high powder resistivity and high insulating performance is obtained. The soft magnetic metal powder is soft magnetic metal powder containing Fe. The soft magnetic metal powder has particles each including a soft magnetic metal portion and a coating portion coating the soft magnetic metal portion. The coating portion includes a first coating portion and a second coating portion. The first coating portion is closer to the soft magnetic metal portion than the second coating portion. The first coating portion and the second coating portion have oxides containing at least one element selected from Si, Fe, and B as a main component. The first coating portion includes amorphous material, the second coating portion includes crystals, and the second coating portion has a higher crystal content ratio than the first coating portion.Type: ApplicationFiled: March 25, 2020Publication date: October 1, 2020Applicant: TDK CORPORATIONInventors: Satoko MORI, Kazuhiro YOSHIDOME, Hiroyuki MATSUMOTO
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Publication number: 20200312499Abstract: A soft magnetic alloy contains Fe as a main element and has an amorphous phase. On a differential scanning calorimetry curve of the soft magnetic alloy, a glass transition temperature Tg is found in a range from 350° C. to 600° C. and three or more exothermic peaks are found in a range from 350° C. to 850° C.Type: ApplicationFiled: March 25, 2020Publication date: October 1, 2020Applicant: TDK CORPORATIONInventors: Hironobu KUMAOKA, Akito HASEGAWA, Hiroyuki MATSUMOTO, Kazuhiro YOSHIDOME
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Publication number: 20200303105Abstract: The present invention relates to a magnetic core containing soft magnetic powder and a coil component using the magnetic core. The soft magnetic powder has particles each having at least one pore therein, and the number of pores present in a region of 2.5 mm square in a cross section of the magnetic core is 60×(?/80) or more and 10000×(?/80) or less, in which the volume packing density of the soft magnetic powder in the magnetic core is ?%.Type: ApplicationFiled: March 19, 2020Publication date: September 24, 2020Applicant: TDK CORPORATIONInventors: Nobuhiro OKUDA, Hiroyuki MATSUMOTO, Kazuhiro YOSHIDOME
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Publication number: 20200279675Abstract: A coil component having high inductance while suppressing core loss is obtained. The coil component includes a coil and a magnetic core. The magnetic core has a laminated body in which soft magnetic layers are laminated. Micro gaps are formed in the soft magnetic layers. The soft magnetic layers are divided into at least two or more small pieces by the micro gaps. A structure made of Fe-based nano-crystals is observed in the soft magnetic layers.Type: ApplicationFiled: February 25, 2020Publication date: September 3, 2020Applicant: TDK CORPORATIONInventors: Kazuhiro YOSHIDOME, Hiroyuki MATSUMOTO, Hitoshi OHKUBO, Atsuyuki NAKANO
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Publication number: 20200279674Abstract: A coil component having high inductance while suppressing core loss is obtained. The coil component includes a coil and a magnetic core. The magnetic core has a laminated body in which soft magnetic layers are laminated. The volume occupation of a magnetic material in the laminated body is 50% or more and 99.5% or less. A structure consisting of Fe-based nanocrystals is observed in the soft magnetic layers.Type: ApplicationFiled: February 25, 2020Publication date: September 3, 2020Applicant: TDK CORPORATIONInventors: Kazuhiro YOSHIDOME, Hiroyuki MATSUMOTO, Hitoshi OHKUBO, Atsuyuki NAKANO
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Publication number: 20200279678Abstract: A coil component having high inductance while suppressing core loss is obtained. The coil component includes a coil and a magnetic core. The magnetic core has a laminated body in which soft magnetic layers are laminated. The thickness of each of the soft magnetic layers is 10 ?m or more and 30 ?m or less. A structure made of Fe-based nano-crystals is observed in the soft magnetic layers.Type: ApplicationFiled: February 25, 2020Publication date: September 3, 2020Applicant: TDK CORPORATIONInventors: Kazuhiro Yoshidome, Hiroyuki Matsumoto, Hitoshi Ohkubo, Atsuyuki Nakano
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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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Publication number: 20200135369Abstract: A soft magnetic alloy powder includes a main component of (Fe(1?(?+?))X1?X2?)(1?(a+b+c+d+e+f))MaBbPcSidCeSf, in which 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, and M is one or more of Nb, Hf, Zr, Ta, Mo, W, Ti, and V. 0?a?0.160, 0.020?b?0.200, 0?c?0.150, 0?d?0.060, 0?e?0.030, 0.0010?f?0.030, 0.005?f/b?1.50, ??0, ??0, and 0??+??0.50 are satisfied.Type: ApplicationFiled: October 28, 2019Publication date: April 30, 2020Applicant: TDK CORPORATIONInventors: Kazuhiro YOSHIDOME, Hiroyuki MATSUMOTO, Kenji HORINO, Masakazu HOSONO, Yoshiki KAJIURA
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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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Patent number: 10535455Abstract: A soft magnetic alloy including a main component having a compositional formula of (Fe(1?(?+?))X1?X2?)(1?(a+b+c))MaBbPc, and a sub component including at least C, S and Ti, wherein X1 is one or more selected from the group including Co and Ni, X2 is one or more selected from the group including Al, Mn, Ag, Zn, Sn, As, Sb, Bi, and rare earth elements, “M” is one or more selected from the group including Nb, Hf, Zr, Ta, Mo, W, and V, 0.020?a?0.14, 0.020?b?0.20, 0?c?0.040, ??0, ??0, and 0??+??0.50 are satisfied, when entire said soft magnetic alloy is 100 wt %, a content of said C is 0.001 to 0.050 wt %, a content of said S is 0.001 to 0.050 wt %, and a content of said Ti is 0.001 to 0.080 wt %, and when a value obtained by dividing the content of said C by the content of said S is C/S, then C/S satisfies 0.10?C/S?10.Type: GrantFiled: January 26, 2018Date of Patent: January 14, 2020Assignee: TDK CORPORATIONInventors: Akihiro Harada, Hiroyuki Matsumoto, Kenji Horino, Kazuhiro Yoshidome, Akito Hasegawa, Hajime Amano, Kensuke Ara, Seigo Tokoro, Shota Otsuka
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Publication number: 20190385770Abstract: A soft magnetic alloy includes a composition of (Fe(1-(?+?))X1?X2?)(1-(a+b+c+d+e+f+g))MaTibBcPdSieSfCg. 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+b?0.140, 0.001?b?0.140, 0.020<c?0.200, 0.010?d?0.150, 0?e?0.060, a?0, f?0, g?0, a+b+c+d+e+f+g<1, ??0, ??0, and 0??+??0.50 are satisfied. The soft magnetic alloy has a nanohetero structure or a structure of Fe-based nanocrystalline.Type: ApplicationFiled: June 4, 2019Publication date: December 19, 2019Applicant: TDK CORPORATIONInventors: Kazuhiro YOSHIDOME, Hiroyuki MATSUMOTO, Kenji HORINO, Hajime AMANO, Akito HASEGAWA
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Publication number: 20190355498Abstract: 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: ApplicationFiled: May 16, 2019Publication date: November 21, 2019Applicant: TDK CORPORATIONInventors: Kazuhiro YOSHIDOME, Hiroyuki MATSUMOTO, Kenji HORINO, Satoko MORI, Masakazu HOSONO, Yoshiki KAJIURA