Patents by Inventor Yoshihiko Oda
Yoshihiko Oda 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: 12232337Abstract: A semiconductor device that is a chip-size-package-type semiconductor device that is facedown mountable includes: a semiconductor layer including a semiconductor substrate and a low-concentration impurity layer in contact with an upper surface of the semiconductor substrate; a metal layer having a thickness of at least 10 ?m; a first vertical MOS transistor in the semiconductor layer; and a second vertical MOS transistor in the semiconductor layer. A side surface of the metal layer includes roughness forming vertical stripes in a direction perpendicular to the metal layer, and has a maximum height of profile greater than 1.0 ?m. In a plan view of the semiconductor device, an area occupancy of a formation containing metal in the metal layer is at most 5% in a 10-?m square region located at least 13 ?m inward from an outer edge of the semiconductor device, within an upper surface of the semiconductor device.Type: GrantFiled: November 1, 2021Date of Patent: February 18, 2025Assignee: NUVOTON TECHNOLOGY CORPORATION JAPANInventors: Yoshihiro Matsushima, Yoshihiko Kawakami, Shinya Oda, Takeshi Harada
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Publication number: 20250034685Abstract: Provided is a non-oriented electrical steel sheet having such a low Al concentration so that it is excellent in terms of the recycling efficiency of scrap iron and having a high magnetic flux density and low iron loss. The non-oriented electrical steel sheet according to the present invention has a chemical composition containing C; 0.0050 mass % or less, Si; 1.5 mass % to 5.0 mass %, Mn; 0.2 mass % to 3.0 mass %, sol·Al; 0.0030 mass % or less, P; 0.2 mass % or less, S; 0.0050 mass % or less, N; 0.0040 mass % or less, T·Ca; 0.0010 mass % to 0.0080 mass %, T·O; 0.0100 mass % or less, REM; 0.0001 mass % to 0.0050 mass %, and a balance of Fe and inevitable impurities, in which a value of a mass-related fractional expression ((T·Ca+REM)/(T·O+S)), which is a relational expression for the masses of the four constituents described above, that is, T·Ca, REM, T·O, and S, is 0.4 or more.Type: ApplicationFiled: October 11, 2024Publication date: January 30, 2025Applicant: JFE Steel CorporationInventors: Akifumi Harada, Akitoshi Matsui, Yoshihiko Oda, Tomoyuki Okubo, Masanori Uesaka
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Patent number: 12146209Abstract: Provided is a non-oriented electrical steel sheet having such a low Al concentration so that it is excellent in terms of the recycling efficiency of scrap iron and having a high magnetic flux density and low iron loss. The non-oriented electrical steel sheet according to the present invention has a chemical composition containing C; 0.0050 mass % or less, Si; 1.5 mass % to 5.0 mass %, Mn; 0.2 mass % to 3.0 mass %, sol.Al; 0.0030 mass % or less, P; 0.2 mass % or less, S; 0.0050 mass % or less, N; 0.0040 mass % or less, T.Ca; 0.0010 mass % to 0.0080 mass %, T.O; 0.0100 mass % or less, REM; 0.0001 mass % to 0.0050 mass %, and a balance of Fe and inevitable impurities, in which a value of a mass-related fractional expression ((T.Ca+REM)/(T.O+S)), which is a relational expression for the masses of the four constituents described above, that is, T.Ca, REM, T.O, and S, is 0.4 or more.Type: GrantFiled: September 5, 2019Date of Patent: November 19, 2024Assignee: JFE Steel CorporationInventors: Akifumi Harada, Akitoshi Matsui, Yoshihiko Oda, Tomoyuki Okubo, Masanori Uesaka
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Patent number: 12123082Abstract: A non-oriented electrical steel sheet having: low high-frequency iron loss and high magnetic flux density; an inner layer and surface layers provided on both sides of the inner layer, the surface layers and the inner layer having specific chemical compositions; the thickness t of 0.01 mm to 0.35 mm; a multilayer ratio of t1 to t of 0.10 to 0.70, t1 denoting a total thickness of the surface layers; a difference between [Si]1 and [Si]0 of 1.0 mass % to 4.5 mass % or less, [Si]1 denoting a Si content in each of the surface layers and [Si]0 denoting a Si content in the inner layer; and a difference between [Mn]0 and [Mn]1 of 0.01 mass % to 0.40 mass %, [Mn]0 denoting a Mn content at a mid-thickness position t/2 and [Mn]1 denoting an average Mn content in a region from a surface to a position at a depth of ( 1/10)t.Type: GrantFiled: April 13, 2020Date of Patent: October 22, 2024Assignee: JFE STEEL CORPORATIONInventors: Yukino Miyamoto, Yoshiaki Zaizen, Yoshihiko Oda
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Patent number: 12018357Abstract: Disclosed is a non-oriented electrical steel sheet having low iron loss in a frequency range of about 400 Hz. The non-oriented electrical steel sheet comprises an inner layer and surface layers, wherein the inner layer and surface layers have specific chemical compositions, each of the surface layers has an in-plane tensile stress of 5 MPa to 50 MPa, the non-oriented electrical steel sheet has a sheet thickness t of 0.01 mm to 0.35 mm, the surface layers have a total thickness t1 with a ratio t1/t of the total thickness t1 to the sheet thickness t being 0.10 to 0.70, the non-oriented electrical steel sheet has an average N content [N] in the total sheet thickness of 40 ppm or less, and an iron loss W10/400 and the sheet thickness t satisfy the following formula (1): W10/400?8+30t??(1).Type: GrantFiled: September 17, 2020Date of Patent: June 25, 2024Assignee: JFE STEEL CORPORATIONInventors: Yukino Miyamoto, Yoshiaki Zaizen, Yoshihiko Oda
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Patent number: 11962184Abstract: In the production of a non-oriented electrical steel sheet by subjecting a steel slab having a certain component composition to a hot rolling, a hot-band annealing, a cold rolling and a finish annealing, the conditions of the finish annealing are controlled such that a yield stress of the steel sheet after the finish annealing is not less than 480 MPa. Also, when a motor core is produced by using the above steel sheet, there can be provided a non-oriented electrical steel sheet capable of producing a rotor core and a stator core as the same raw material where the stator core is subjected to a stress relief annealing at a soaking temperature of 780 to 950° C. in an atmosphere having a nitrogen content of not more than 30 vol % and a dew point of not higher than ?20° C., while a motor core is produced with such a steel sheet.Type: GrantFiled: June 15, 2020Date of Patent: April 16, 2024Assignee: JFE Steel CorporationInventors: Yoshiaki Zaizen, Yoshihiko Oda, Tomoyuki Okubo, Takaaki Tanaka, Yukino Miyamoto
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Patent number: 11946123Abstract: Provided is a method of easily producing a non-oriented electrical steel sheet that contains substantially no Al and contains large amounts of Si and Mn and has low iron loss, comprising hot rolling a slab having a specified chemical composition to obtain a hot-rolled sheet; coiling the hot-rolled sheet; cold rolling the hot-rolled sheet once or twice with intermediate annealing being performed therebetween, to obtain a cold-rolled sheet; and subjecting the cold-rolled sheet to final annealing, wherein the hot-rolled sheet after the hot rolling is cooled at an average cooling rate from 800° C. to 650° C. of 30° C./s or more, and thereafter the coiling is performed at 650° C. or less.Type: GrantFiled: April 7, 2023Date of Patent: April 2, 2024Assignee: JFE STEEL CORPORATIONInventors: Masanori Uesaka, Yoshiaki Zaizen, Tomoyuki Okubo, Hiroaki Nakajima, Yoshihiko Oda
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Patent number: 11732319Abstract: Proposed is a non-oriented electrical steel sheet being low in iron loss and excellent in tensile strength and fatigue strength, which has a chemical composition comprising C: not more than 0.005 mass %, Si: 3 to 5 mass %, Mn: not more than 5 mass %, P: not more than 0.1 mass %, S: not more than 0.01 mass %, Al: not more than 3 mass %, N: not more than 0.005 mass %, Zn: 0.0005 mass % to 0.003 mass %, and the remainder being Fe and inevitable impurities, an average crystal grain size being not more than 40 ?m, the number of the inclusions having a diameter of not less than 5 ?m being not more than 5/mm2, a tensile strength being not less than 600 MPa, and the fatigue strength being not less than 450 MPa.Type: GrantFiled: December 10, 2019Date of Patent: August 22, 2023Assignee: JFE Steel CorporationInventors: Yoshihiko Oda, Yoshiaki Zaizen, Tomoyuki Okubo, Takaaki Tanaka, Yukino Miyamoto
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Publication number: 20230257860Abstract: Provided is a method of easily producing a non-oriented electrical steel sheet that contains substantially no Al and contains large amounts of Si and Mn and has low iron loss, comprising hot rolling a slab having a specified chemical composition to obtain a hot-rolled sheet; coiling the hot-rolled sheet; cold rolling the hot-rolled sheet once or twice with intermediate annealing being performed therebetween, to obtain a cold-rolled sheet; and subjecting the cold-rolled sheet to final annealing, wherein the hot-rolled sheet after the hot rolling is cooled at an average cooling rate from 800° C. to 650° C. of 30° C./s or more, and thereafter the coiling is performed at 650° C. or less.Type: ApplicationFiled: April 7, 2023Publication date: August 17, 2023Applicant: JFE STEEL CORPORATIONInventors: Masanori UESAKA, Yoshiaki ZAIZEN, Tomoyuki OKUBO, Hiroaki NAKAJIMA, Yoshihiko ODA
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Patent number: 11718891Abstract: A non-oriented electrical steel sheet with an average magnetostriction ?p-p at 400 Hz and 1.0 T of not more than 4.5×10?6, and area ratio of recrystallized grains at a section in rolling direction of steel sheet of 40 to 95% and an average grain size of 10 to 40 ?m is obtained by subjecting a steel slab containing, in mass %, C: not more than 0.005%, Si: 2.8 to 6.5%, Mn: 0.05 to 2.0%, Al: not more than 3.0%, P: not more than 0.20%, S: not more than 0.005%, N: not more than 0.005%, Ti: not more than 0.003%, V: not more than 0.005% and Nb: not more than 0.005% and satisfying Si-2Al—Mn?0 to hot rolling, hot-band annealing, cold rolling and finish annealing under adequate cold rolling and finish annealing conditions, and a motor core is manufactured by such a steel sheet.Type: GrantFiled: October 31, 2022Date of Patent: August 8, 2023Assignee: JFE STEEL CORPORATIONInventors: Yoshiaki Zaizen, Tomoyuki Okubo, Yoshihiko Oda, Yukino Miyamoto
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Patent number: 11649532Abstract: Provided is a non-oriented electrical steel sheet that contains substantially no Al and contains large amounts of Si and Mn and has low iron loss, comprising a chemical composition containing C: 0.0050% or less, Si: 2.0% or more and 6.0% or less, Mn: 1.0% or more and 3.0% or less, P: 0.20% or less, S: 0.0050% or less, N: 0.0050% or less, Al: 0.0050% or less, and one or more selected from B: 0.0001% or more and 0.0050% or less, Nb: 0.0001% or more and 0.0050% or less, and V: 0.0005% or more and 0.0500% or less, with a balance consisting of Fe and inevitable impurities, wherein a number density of Si—Mn nitrides with an average diameter of 50 nm or more and 500 nm or less is 1 or less per ?m3.Type: GrantFiled: May 20, 2019Date of Patent: May 16, 2023Assignee: JFE STEEL CORPORATIONInventors: Masanori Uesaka, Yoshiaki Zaizen, Tomoyuki Okubo, Hiroaki Nakajima, Yoshihiko Oda
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Publication number: 20230065674Abstract: A non-oriented electrical steel sheet with an average magnetostriction ?p-p at 400 Hz and 1.0 T of not more than 4.5×10?6, and area ratio of recrystallized grains at a section in rolling direction of steel sheet of 40 to 95% and an average grain size of 10 to 40 ?m is obtained by subjecting a steel slab containing, in mass %, C: not more than 0.005%, Si: 2.8 to 6.5%, Mn: 0.05 to 2.0%, Al: not more than 3.0%, P: not more than 0.20%, S: not more than 0.005%, N: not more than 0.005%, Ti: not more than 0.003%, V: not more than 0.005% and Nb: not more than 0.005% and satisfying Si-2Al-Mn?0 to hot rolling, hot-band annealing, cold rolling and finish annealing under adequate cold rolling and finish annealing conditions, and a motor core is manufactured by such a steel sheet.Type: ApplicationFiled: October 31, 2022Publication date: March 2, 2023Applicant: JFE STEEL CORPORATIONInventors: Yoshiaki ZAIZEN, Tomoyuki OKUBO, Yoshihiko ODA, Yukino MIYAMOTO
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Patent number: 11525169Abstract: A non-oriented electrical steel sheet with an average magnetostriction ?p-p at 400 Hz and 1.0 T of not more than 4.5×10?6, and area ratio of recrystallized grains at a section in rolling direction of steel sheet of 40 to 95% and an average grain size of 10 to 40 ?m is obtained by subjecting a steel slab containing, in mass %, C: not more than 0.005%, Si: 2.8 to 6.5%, Mn: 0.05 to 2.0%, Al: not more than 3.0%, P: not more than 0.20%, S: not more than 0.005%, N: not more than 0.005%, Ti: not more than 0.003%, V: not more than 0.005% and Nb: not more than 0.005% and satisfying Si—2Al—Mn?0 to hot rolling, hot-band annealing, cold rolling and finish annealing under adequate cold rolling and finish annealing conditions, and a motor core is manufactured by such a steel sheet.Type: GrantFiled: July 16, 2019Date of Patent: December 13, 2022Assignee: JFE STEEL CORPORATIONInventors: Yoshiaki Zaizen, Tomoyuki Okubo, Yoshihiko Oda, Yukino Miyamoto
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Publication number: 20220393520Abstract: Provided are a motor core having excellent fatigue resistance and a method of manufacturing the motor core at a low cost. The motor core that is an electrical-steel-sheet-stacked body has an outer peripheral surface in which an appearance ratio of recrystallized grains with a grain size of 15 ?m or less is 70% or more of a sheet thickness of the motor core.Type: ApplicationFiled: November 18, 2020Publication date: December 8, 2022Applicant: JFE STEEL CORPORATIONInventors: Takaaki TANAKA, Tomoyuki OKUBO, Yoshihiko ODA
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Publication number: 20220375667Abstract: Provides is a non-oriented electrical steel sheet suitable for use in a rotor of an IPM motor that has excellent magnetic flux density B50 and high-frequency iron loss properties, high tensile strength and fatigue strength, and little variation in tensile strength. The non-oriented electrical steel sheet has a predetermined steel sheet chemical composition and a microstructure in which a ratio of non-recrystallized microstructure is 5% or more and 70% or less and the number of inclusion having a diameter of 5 ?m or more is not more than 5 counts/mm2.Type: ApplicationFiled: May 13, 2020Publication date: November 24, 2022Applicant: JFE STEEL CORPORATIONInventors: Yoshihiko ODA, Yoshiaki ZAIZEN, Tomoyuki OKUBO, Takaaki TANAKA, Yukino MIYAMOTO
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Publication number: 20220372600Abstract: A non-oriented electrical steel sheet produced by hot-rolling a steel slab containing Si: 2.8 to 6.5 mass % and Zn: 0.0005 to 0.0050 mass % followed by cold rolling and finish annealing, a coating agent containing at least one element from Sn, Sb, P, S, Se, As, Te, B, Pb, and Bi is applied to the surface after annealing forming an insulation coating with nitriding-suppressing ability. Alternatively, an intermediate layer containing at least one element from Sn, Sb, P, S, Se, As, Te, B, Pb, and Bi and having a nitriding-suppressing ability forms on the steel sheet iron matrix after the annealing and forms an insulation coating, without above elements, on the intermediate layer thus obtaining a non-oriented electrical steel sheet wherein a high strength rotor core with and stator core with excellent magnetic is simultaneously obtained, and a motor core including a stator core and rotor core from the steel sheet.Type: ApplicationFiled: October 12, 2020Publication date: November 24, 2022Applicant: JFE STEEL CORPORATIONInventors: Yoshiaki ZAIZEN, Nobuko NAKAGAWA, Yoshihiko ODA, Tomoyuki OKUBO, Chiyoko TADA
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Publication number: 20220359108Abstract: Provided is a non-oriented electrical steel sheet having an average crystal grain size of crystal grains being not more than 80 ?m, an area ratio of crystal grains having a grain size of not less than 1.5 times the average crystal grain size being not less than 10%; and an area ratio of crystal grains having aspect ratios of not more than 0.3 being not more than 20%, by subjecting a steel raw material containing, in mass %, C: not more than 0.005%, Si: 2.0 to 5.0%, Mn: 0.05 to 5.0%, Al: not more than 3.0%, and Zn: 0.0003 to 0.0050% to hot rolling, cold rolling, and cold-rolled sheet annealing and by heating the cold-rolled sheet to an annealing temperature between 700 to 850° C. at the average heating rate between 500 and 700° C. in a heating process of the cold-rolled sheet annealing to be not less than 10° C./s.Type: ApplicationFiled: July 7, 2020Publication date: November 10, 2022Applicant: JFE Steel CorporationInventors: Takaaki Tanaka, Tomoyuki Okubo, Yoshiaki Zaizen, Yoshihiko Oda, Yukino Miyamoto
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Publication number: 20220290287Abstract: Disclosed is a non-oriented electrical steel sheet having low iron loss in a frequency range of about 400 Hz. The non-oriented electrical steel sheet comprises an inner layer and surface layers, wherein the inner layer and surface layers have specific chemical compositions, each of the surface layers has an in-plane tensile stress of 5 MPa to 50 MPa, the non-oriented electrical steel sheet has a sheet thickness t of 0.01 mm to 0.35 mm, the surface layers have a total thickness t1 with a ratio t1/t of the total thickness t1 to the sheet thickness t being 0.10 to 0.70, the non-oriented electrical steel sheet has an average N content [N] in the total sheet thickness of 40 ppm or less, and an iron loss W10/400 and the sheet thickness t satisfy the following formula (1): W10/400?8+30t??(1).Type: ApplicationFiled: September 17, 2020Publication date: September 15, 2022Applicant: JFE STEEL CORPORATIONInventors: Yukino MIYAMOTO, Yoshiaki ZAIZEN, Yoshihiko ODA
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Publication number: 20220278566Abstract: In the production of a non-oriented electrical steel sheet by subjecting a steel slab having a certain component composition to a hot rolling, a hot-band annealing, a cold rolling and a finish annealing, the conditions of the finish annealing are controlled such that a yield stress of the steel sheet after the finish annealing is not less than 480 MPa. Also, when a motor core is produced by using the above steel sheet, there can be provided a non-oriented electrical steel sheet capable of producing a rotor core and a stator core as the same raw material where the stator core is subjected to a stress relief annealing at a soaking temperature of 780 to 950° C. in an atmosphere having a nitrogen content of not more than 30 vol % and a dew point of not higher than ?20° C., while a motor core is produced with such a steel sheet.Type: ApplicationFiled: June 15, 2020Publication date: September 1, 2022Applicant: JFE Steel CorporationInventors: Yoshiaki Zaizen, Yoshihiko Oda, Tomoyuki Okubo, Takaaki Tanaka, Yukino Miyamoto
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Patent number: 11404189Abstract: A non-oriented electrical steel sheet produced by hot rolling a steel slab containing, by mass %, C: not more than 0.0050, Si: 3.2 to 4.5%, Mn: 0.1 to 2.0%, P: not more than 0.020%, As: not more than 0.0030%, Sn+Sb: 0.005 to 0.10%, and one or two elements selected from Mo and W by a content ranging from 0.0020 to 0.10% in total, subjecting the resultant steel sheet to one cold rolling or two or more cold rollings including an intermediate annealing therebetween to achieve a final sheet thickness, and then subjecting the cold rolled sheet to finish annealing, a N2 content in an atmosphere in the finish annealing is set to not more than 20 vol %, and average strain rate in the first pass is set to not more than 4/sec, allowing the cold rolling property to improve with no degradation in magnetic property and no decrease in productivity.Type: GrantFiled: May 8, 2018Date of Patent: August 2, 2022Assignee: JFE STEEL CORPORATIONInventors: Tomoyuki Okubo, Yoshiaki Zaizen, Masanori Uesaka, Yoshihiko Oda