Patents by Inventor Hironobu KUMAOKA
Hironobu KUMAOKA 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: 11887761Abstract: A soft magnetic alloy including an internal area having a soft magnetic type alloy composition including Fe and P (phosphorous), and a P concentrated area existing closer to a surface side than the internal area and having a higher P concentration than in the internal area.Type: GrantFiled: February 15, 2022Date of Patent: January 30, 2024Assignee: TDK CORPORATIONInventors: Hironobu Kumaoka, Kazuhiro Yoshidome, Hiroyuki Matsumoto, Akito Hasegawa
-
Patent number: 11881338Abstract: A soft magnetic alloy comprising 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, a SB concentrated area existing closer to the surface side than the Co concentrated area and having a higher concentration of at least one element selected from Si and B than in the internal area, and a Fe concentrated area including Fe existing closer to the surface side than the SB concentrated area; wherein a crystalized area ratio of the SB concentrated area represented by SSBcry/SSB and a crystalized area ratio of the Fe concentrated area represented by SFecry/SFe, satisfy a relation of (SSBcry/SSB)<(SFecry/SFe).Type: GrantFiled: February 15, 2022Date of Patent: January 23, 2024Assignee: TDK CORPORATIONInventors: Hironobu Kumaoka, Kazuhiro Yoshidome, Akito Hasegawa, Satoko Mori
-
Patent number: 11791077Abstract: 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 SB concentrated area existing closer to the surface side than the Co concentrated area and having a higher concentration of at least one element selected from Si and B than in the internal area.Type: GrantFiled: February 15, 2022Date of Patent: October 17, 2023Assignee: TDK CORPORATIONInventors: Hironobu Kumaoka, Kazuhiro Yoshidome, Akito Hasegawa, Satoko Mori
-
Publication number: 20220380875Abstract: A soft magnetic alloy and the like which simultaneously satisfy a high saturation magnetic flux density Bs and a high corrosion resistance. A soft magnetic alloy includes Mn and a component expressed by a compositional formula of ((Fe(1?(?+?))Co?Ni?)1??X1?)(1?(a+b+c+d+e))BaPbSicCdCre (atomic ratio). X1 is one or more selected from Ti, Zr, Hf, Nb, Ta, Mo, W, Al, Ga, Ag, Zn, S, Ca, Mg, V, Sn, As, Sb, Bi, N, O, Au, Cu, rare earth elements, and platinum group elements. Further, a to e and ? to ? are within predetermined ranges. Mn amount f (at %) is within a range of 0.002?f<3.0. The soft magnetic alloy satisfies a corrosion potential of ?630 mV or more and ?50 mV or less and a corrosion current density of 0.3 ?A/cm2 or more and 45 ?A/cm2 or less.Type: ApplicationFiled: May 13, 2021Publication date: December 1, 2022Applicant: TDK CORPORATIONInventors: Kazuhiro YOSHIDOME, Hiroyuki MATSUMOTO, Akito HASEGAWA, Hironobu KUMAOKA
-
Publication number: 20220328223Abstract: 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: ApplicationFiled: March 17, 2022Publication date: October 13, 2022Applicant: TDK CORPORATIONInventors: Hironobu KUMAOKA, Kazuhiro YOSHIDOME, Akito HASEGAWA, Satoko MORI
-
Publication number: 20220328222Abstract: 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 SB concentrated area existing closer to the surface side than the Co concentrated area and having a higher concentration of at least one element selected from Si and B than in the internal area.Type: ApplicationFiled: February 15, 2022Publication date: October 13, 2022Applicant: TDK CORPORATIONInventors: Hironobu KUMAOKA, Kazuhiro YOSHIDOME, Akito HASEGAWA, Satoko MORI
-
Publication number: 20220319748Abstract: A soft magnetic alloy including an internal area having a soft magnetic type alloy composition including Fe and P (phosphorous), and a P concentrated area existing closer to a surface side than the internal area and having a higher P concentration than in the internal area.Type: ApplicationFiled: February 15, 2022Publication date: October 6, 2022Applicant: TDK CORPORATIONInventors: Hironobu KUMAOKA, Kazuhiro YOSHIDOME, Hiroyuki MATSUMOTO, Akito HASEGAWA
-
Publication number: 20220319749Abstract: A soft magnetic alloy comprising 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, a SB concentrated area existing closer to the surface side than the Co concentrated area and having a higher concentration of at least one element selected from Si and B than in the internal area, and a Fe concentrated area including Fe existing closer to the surface side than the SB concentrated area; wherein a crystalized area ratio of the SB concentrated area represented by SSBcry/SSB and a crystalized area ratio of the Fe concentrated area represented by SFecry/SFe, satisfy a relation of (SSBcry/SSB)<(SFecry/SFe).Type: ApplicationFiled: February 15, 2022Publication date: October 6, 2022Applicant: TDK CORPORATIONInventors: Hironobu KUMAOKA, Kazuhiro YOSHIDOME, Akito HASEGAWA, Satoko MORI
-
Patent number: 11427896Abstract: 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: GrantFiled: December 3, 2018Date of Patent: August 30, 2022Assignee: TDK CORPORATIONInventors: Akito Hasegawa, Hironobu Kumaoka, Kazuhiro Yoshidome, Hiroyuki Matsumoto, Kenji Horino, Isao Nakahata
-
Publication number: 20220208423Abstract: A soft magnetic alloy powder which is a soft magnetic alloy powder having a low coercivity, and with which it is possible to obtain a green compact magnetic core having a high magnetic permeability. A soft magnetic alloy powder including a composition formula (Fe(1?(?+?))X1 ?X2 ?) (1?(a+b+c+d+e+f)) MaBbPcSidCeSf. XI 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 or Al, Mn, Ag, Zn, Sn, As, Sb, Cu, Cr, Bi, N, O and rare earth elements, and M is one or more elements selected from the group consisting of Nb, Hf, Zr, Ta, Mo, W, Ti and V. The amount of each component contained is within a specified range. The amorphous rate X (%) is at least 85%.Type: ApplicationFiled: April 22, 2020Publication date: June 30, 2022Applicant: TDK CORPORATIONInventors: Kazuhiro YOSHIDOME, Hiroyuki MATSUMOTO, Akito HASEGAWA, Hironobu KUMAOKA
-
Publication number: 20210230720Abstract: A soft magnetic alloy powder has a specific composition in which a Co content is large. A soft magnetic alloy powder has a glass transition point Tg and a melting point Tm, 900° C.?Tm?1200° C. is satisfied, or when coercivity when applying a pressure XP to a soft magnetic alloy powder is set as YH, and a straight line obtained by linearly approximating a relationship between XP and YH by a method of least squares is set as YH=kXP+1, k (unit: Oe/MPa) satisfies 0?k?0.00100.Type: ApplicationFiled: December 11, 2020Publication date: July 29, 2021Applicant: TDK CORPORATIONInventors: Yoshiki KAJIURA, Akito HASEGAWA, Kazuhiro YOSHIDOME, Hiroyuki MATSUMOTO, Hironobu KUMAOKA
-
Publication number: 20210098162Abstract: 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: ApplicationFiled: September 22, 2020Publication date: April 1, 2021Applicant: TDK CorporationInventors: Hironobu KUMAOKA, Akito HASEGAWA, Kazuhiro YOSHIDOME, Hiroyuki MATSUMOTO
-
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
-
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