Patents by Inventor Norikazu Koyuhara
Norikazu Koyuhara 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: 20230290554Abstract: A sintered MnZn ferrite comprising as main components 53.5 to 54.3% by mol of Fe calculated as Fe2O3, and 4.2 to 7.2% by mol of Zn calculated as ZnO, the balance being Mn calculated as MnO, and comprising as sub-components 0.003 to 0.018 parts by mass of Si calculated as SiO2, 0.03 to 0.21 parts by mass of Ca calculated as CaCO3, 0.40 to 0.50 parts by mass of Co calculated as Co3O4, 0 to 0.09 parts by mass of Zr calculated as ZrO2, and 0 to 0.015 parts by mass of Nb calculated as Nb2O5, per 100 parts by mass in total of the main components (calculated as the oxides), C(zn)/C(co) being 9.3 to 16.0 wherein C(zn) is the content of Zn contained as a main component (% by mol calculated as ZnO in the main components), and C(co) is the content of Co contained as a sub-component (parts by mass calculated as Co3O4 per 100 parts by mass in total of the main components).Type: ApplicationFiled: October 28, 2022Publication date: September 14, 2023Applicant: PROTERIAL, LTD.Inventors: Hayato MASUMITSU, Yasuharu MIYOSHI, Norikazu KOYUHARA
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Patent number: 11398328Abstract: A sintered MnZn ferrite body containing main components comprising 53.30-53.80% by mol of Fe calculated as Fe2O3, 6.90-9.50% by mol Zn calculated as ZnO, and the balance of Mn calculated as MnO, and sub-components comprising 0.003-0.020 parts by mass of Si calculated as SiO2, more than 0 parts and 0.35 parts or less by mass of Ca calculated as CaCO3, 0.30-0.50 parts by mass of Co calculated as Co3O4, 0.03-0.10 parts by mass of Zr calculated as ZrO2, and 0-0.05 parts by mass of Ta calculated as Ta2O5, pre 100 parts by mass in total of the main components (calculated as the oxides), and having an average crystal grain size of 3 ?m or more and less than 8 ?m and a density of 4.65 g/cm3 or more.Type: GrantFiled: March 27, 2018Date of Patent: July 26, 2022Assignee: HITACHI METALS, LTD.Inventors: Yasuharu Miyoshi, Tomoyuki Tada, Norikazu Koyuhara
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Patent number: 11242288Abstract: A sintered Ni ferrite body having a composition comprising, calculated as oxide, 47.0-48.3% by mol of Fe2O3, 14.5% or more and less than 25% by mol of ZnO, 8.2-10.0% by mol of CuO, and more than 0.6% and 2.5% or less by mol of CoO, the balance being NiO and inevitable impurities, and having an average crystal grain size of more than 2.5 ?m and less than 5.5 ?m.Type: GrantFiled: March 15, 2018Date of Patent: February 8, 2022Assignee: HITACHI METALS, LTD.Inventors: Satoru Tanaka, Norikazu Koyuhara, Tomoyuki Tada
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Publication number: 20210139377Abstract: A sintered Ni ferrite body having a composition comprising, calculated as oxide, 47.0-48.3% by mol of Fe2O3, 14.5% or more and less than 25% by mol of ZnO, 8.2-10.0% by mol of CuO, and more than 0.6% and 2.5% or less by mol of CoO, the balance being NiO and inevitable impurities, and having an average crystal grain size of more than 2.5 ?m and less than 5.5 ?m.Type: ApplicationFiled: March 15, 2018Publication date: May 13, 2021Applicant: HITACHI METALS, LTD.Inventors: Satoru TANAKA, Norikazu KOYUHARA, Tomoyuki TADA
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Patent number: 10950375Abstract: A method for producing a MnZn ferrite core used at a frequency of 1 MHz or more and an exciting magnetic flux density of 75 mT or less, the MnZn ferrite comprising 53-56% by mol of Fe (calculated as Fe2O3), and 3-9% by mol of Zn (calculated as ZnO), the balance being Mn (calculated as MnO), as main components, and 0.05-0.4 parts by mass of Co (calculated as Co3O4) as a sub-component, per 100 parts by mass in total of the main components (calculated as the oxides); comprising a step of molding a raw material powder for the MnZn ferrite to obtain a green body; a step of sintering the green body and cooling it to a temperature of lower than 150° C. to obtain a sintered body of MnZn ferrite; and a step of conducting a heat treatment comprising heating the sintered body of MnZn ferrite to a temperature meeting Condition 1 of 200° C. or higher, and Condition 2 of (Tc?90)° C. to (Tc+100)° C., wherein Tc is a Curie temperature (° C.Type: GrantFiled: March 24, 2017Date of Patent: March 16, 2021Assignee: HITACHI METALS. LTD.Inventors: Norikazu Koyuhara, Yasuharu Miyoshi, Tomoyuki Tada, Satoru Tanaka
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Patent number: 10937579Abstract: A method for producing MnZn-ferrite comprising Fe, Mn and Zn as main components, and at least Co, Si and Ca as sub-components, the main components in the MnZn-ferrite comprising 53-56% by mol (as Fe2O3) of Fe, and 3-9% by mol (as ZnO) of Zn, the balance being Mn as MnO, comprising the step of sintering a green body to obtain MnZn-ferrite; the sintering comprising a temperature-elevating step, a high-temperature-keeping step, and a cooling step; the high-temperature-keeping step being conducted at a keeping temperature of higher than 1050° C. and lower than 1150° C. in an atmosphere having an oxygen concentration of 0.4-2% by volume; the oxygen concentration being in a range of 0.001-0.2% by volume during cooling from 900° C. to 400° C. in the cooling step; and the cooling speed between (Tc+70)° C. and 100° C. being 50° C./hour or more, wherein Tc represents a Curie temperature (° C.) calculated from % by mass of Fe2O3 and ZnO.Type: GrantFiled: December 24, 2015Date of Patent: March 2, 2021Assignee: HITACHI METALS, LTD.Inventors: Norikazu Koyuhara, Yasuharu Miyoshi, Tomoyuki Tada, Satoru Tanaka
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Patent number: 10919809Abstract: A method for producing MnZn ferrite comprising Fe, Mn and Zn as main components, and Ca, Si and Co, and at least one selected from the group consisting of Ta, Nb and Zr as sub-components, comprising a step of molding a raw material powder for the MnZn ferrite to obtain a green body, and a step of sintering the green body; the sintering step comprising a temperature-elevating step, a high-temperature-keeping step, and a cooling step; the cooling step including a slow cooling step of cooling in a temperature range of 1100° C. to 1250° C. at a cooling speed of 0° C./hour to 20° C./hour for 1 hours to 20 hours, and a cooling speed before and after the slow cooling step being higher than 20° C./hour; the MnZn ferrite having a volume resistivity of 8.5 ?·m or more at room temperature, an average crystal grain size of 7 ?m to 15 ?m, and core loss of 420 kW/m3 or less between 23° C. and 140° C. at a frequency of 100 kHz and an exciting magnetic flux density of 200 mT.Type: GrantFiled: March 24, 2017Date of Patent: February 16, 2021Assignee: HITACHI METALS, LTD.Inventors: Yasuharu Miyoshi, Norikazu Koyuhara, Tomoyuki Tada
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Publication number: 20200373047Abstract: A sintered MnZn ferrite body containing main components comprising 53.30-53.80% by mol of Fe calculated as Fe2O3, 6.90-9.50% by mol Zn calculated as ZnO, and the balance of Mn calculated as MnO, and sub-components comprising 0.003-0.020 parts by mass of Si calculated as SiO2, more than 0 parts and 0.35 parts or less by mass of Ca calculated as CaCO3, 0.30-0.50 parts by mass of Co calculated as Co3O4, 0.03-0.10 parts by mass of Zr calculated as ZrO2, and 0-0.05 parts by mass of Ta calculated as Ta2O5, pre 100 parts by mass in total of the main components (calculated as the oxides), and having an average crystal grain size of 3 ?m or more and less than 8 ?m and a density of 4.65 g/cm3 or more.Type: ApplicationFiled: March 27, 2018Publication date: November 26, 2020Applicant: HITACHI METALS, LTD.Inventors: Yasuharu MIYOSHI, Tomoyuki TADA, Norikazu KOYUHARA
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Patent number: 10304602Abstract: Provided are: a MnZn-based ferrite which allows to have a low magnetic core loss and to suppress a time-dependent change of magnetic property under a high-temperature environment by a control of ambient oxygen concentration and an increase of the magnetic core loss, and a method for manufacturing the same. The MnZn-based ferrite is characterized in that Fe ranges from 53.25 mol % or more to 54.00 mol % or less on the basis of Fe2O3, Zn ranges from 2.50 mol % or more to 8.50 mol % or less on the basis of ZnO and Mn is the remainder on the basis of MnO, Si ranges from more than 0.001 mass % to less than 0.02 mass % on the basis of SiO2, Ca ranges from more than 0.04 mass % to less than 0.4 mass % on the basis of CaCO3, Co is less than 0.5 mass % on the basis of Co3O4, Bi is less than 0.05 mass % on the basis of Bi2O3, Ta is less than 0.05 mass % on the basis of Ta2O5, Nb is less than 0.05 mass % on the basis of Nb2O5, Ti is less than 0.3 mass % on the basis of TiO2, and Sn is less than 0.Type: GrantFiled: August 31, 2015Date of Patent: May 28, 2019Assignee: Hitachi Metals, Ltd.Inventors: Tomoyuki Tada, Yasuharu Miyoshi, Norikazu Koyuhara
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Publication number: 20190096554Abstract: A method for producing a MnZn ferrite core used at a frequency of 1 MHz or more and an exciting magnetic flux density of 75 mT or less, the MnZn ferrite comprising 53-56% by mol of Fe (calculated as Fe2O3), and 3-9% by mol of Zn (calculated as ZnO), the balance being Mn (calculated as MnO), as main components, and 0.05-0.4 parts by mass of Co (calculated as Co3O4) as a sub-component, per 100 parts by mass in total of the main components (calculated as the oxides); comprising a step of molding a raw material powder for the MnZn ferrite to obtain a green body; a step of sintering the green body and cooling it to a temperature of lower than 150° C. to obtain a sintered body of MnZn ferrite; and a step of conducting a heat treatment comprising heating the sintered body of MnZn ferrite to a temperature meeting Condition 1 of 200° C. or higher, and Condition 2 of (Tc?90)° C. to (Tc+100) ° C., wherein Tc is a Curie temperature (° C.Type: ApplicationFiled: March 24, 2017Publication date: March 28, 2019Applicant: HITACHI METALS, LTD.Inventors: Norikazu KOYUHARA, Yasuharu MIYOSHI, Tomoyuki TADA, Satoru TANAKA
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Publication number: 20190062217Abstract: A method for producing MnZn ferrite comprising Fe, Mn and Zn as main components, and Ca, Si and Co, and at least one selected from the group consisting of Ta, Nb and Zr as sub-components, comprising a step of molding a raw material powder for the MnZn ferrite to obtain a green body, and a step of sintering the green body; the sintering step comprising a temperature-elevating step, a high-temperature-keeping step, and a cooling step; the cooling step including a slow cooling step of cooling in a temperature range of 1100° C. to 1250° C. at a cooling speed of 0° C./hour to 20° C./hour for 1 hours to 20 hours, and a cooling speed before and after the slow cooling step being higher than 20° C./hour; the MnZn ferrite having a volume resistivity of 8.5 ?·m or more at room temperature, an average crystal grain size of 7 ?m to 15 ?m, and core loss of 420 kW/m3 or less between 23° C. and 140° C. at a frequency of 100 kHz and an exciting magnetic flux density of 200 mT.Type: ApplicationFiled: March 24, 2017Publication date: February 28, 2019Applicant: HITACHI METALS, LTD.Inventors: Yasuharu MIYOSHI, Norikazu KOYUHARA, Tomoyuki TADA
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Publication number: 20170352455Abstract: A method for producing MnZn-ferrite comprising Fe, Mn and Zn as main components, and at least Co, Si and Ca as sub-components, the main components in the MnZn-ferrite comprising 53-56% by mol (as Fe2O3) of Fe, and 3-9% by mol (as ZnO) of Zn, the balance being Mn as MnO, comprising the step of sintering a green body to obtain MnZn-ferrite; the sintering comprising a temperature-elevating step, a high-temperature-keeping step, and a cooling step; the high-temperature-keeping step being conducted at a keeping temperature of higher than 1050° C. and lower than 1150° C. in an atmosphere having an oxygen concentration of 0.4-2% by volume; the oxygen concentration being in a range of 0.001-0.2% by volume during cooling from 900° C. to 400° C. in the cooling step; and the cooling speed between (Tc+70)° C. and 100° C. being 50° C./hour or more, wherein Tc represents a Curie temperature (° C.) calculated from % by mass of Fe2O3 and ZnO.Type: ApplicationFiled: December 24, 2015Publication date: December 7, 2017Applicant: HITACHI METALS, LTD.Inventors: Norikazu KOYUHARA, Yasuharu MIYOSHI, Tomoyuki TADA, Satoru TANAKA
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Publication number: 20170278607Abstract: Provided are: a MnZn-based ferrite which allows to have a low magnetic core loss and to suppress a time-dependent change of magnetic property under a high-temperature environment by a control of ambient oxygen concentration and an increase of the magnetic core loss, and a method for manufacturing the same. The MnZn-based ferrite is characterized in that Fe ranges from 53.25 mol % or more to 54.00 mol % or less on the basis of Fe2O3, Zn ranges from 2.50 mol % or more to 8.50 mol % or less on the basis of ZnO and Mn is the remainder on the basis of MnO, Si ranges from more than 0.001 mass % to less than 0.02 mass % on the basis of SiO2, Ca ranges from more than 0.04 mass % to less than 0.4 mass % on the basis of CaCO3, Co is less than 0.5 mass % on the basis of Co3O4, Bi is less than 0.05 mass % on the basis of Bi2O3, Ta is less than 0.05 mass % on the basis of Ta2O5, Nb is less than 0.05 mass % on the basis of Nb2O5, Ti is less than 0.3 mass % on the basis of TiO2, and Sn is less than 0.Type: ApplicationFiled: August 31, 2015Publication date: September 28, 2017Applicant: Hitachi Metals, Ltd.Inventors: Tomoyuki Tada, Yasuharu Miyoshi, Norikazu Koyuhara
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Patent number: 7061355Abstract: A ferrite core for use in coupling transformers and distributing transformers in CATV equipments such as couplers, distributors and amplifiers, the ferrite core being made of a ferrite having a saturation magnetostriction |?S| of 8×10?6 or less in an absolute value and an initial permeability ?i of 300 or more.Type: GrantFiled: August 28, 2003Date of Patent: June 13, 2006Assignee: Hitachi Metals, Ltd.Inventors: Satoru Tanaka, Norikazu Koyuhara, Makoto Kadowaki, Yoshihito Yoshikawa, Shiro Murakami
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Publication number: 20040113742Abstract: A ferrite core for use in coupling transformers and distributing transformers in CATV equipments such as couplers, distributors and amplifiers, the ferrite core being made of a ferrite having a saturation magnetostriction |&lgr;s| of 8×10−6 or less in an absolute value and an initial permeability &mgr;i of 300 or more.Type: ApplicationFiled: August 28, 2003Publication date: June 17, 2004Applicant: HITACHI METALS, LTD.Inventors: Satoru Tanaka, Norikazu Koyuhara, Makoto Kadowaki, Yoshihito Yoshizawa, Shiro Murakami
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Patent number: 5815062Abstract: In the magnetic core including a first leg portion around which a wire is wound, a second leg portion for circulating a magnetic flux generated in the first leg portion, and a web portion connecting the first leg portion and the second leg portion, a magnetic gap is provided in a rear area extending from the root of the first leg portion. With the magnetic gap, a magnetic flux leaking outwardly from a rear area extending from the root of the first leg portion is drastically reduced.Type: GrantFiled: February 28, 1997Date of Patent: September 29, 1998Assignees: Hitachi Metal, Ltd., Hitachi Ferrite Electronics, Ltd.Inventors: Norikazu Koyuhara, Youichi Yamamoto, Toshihiko Tanaka
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Patent number: 5618464Abstract: A Ni ferrite sintered body comprising 48.0-50.0 mol % of Fe.sub.2 O.sub.3, 14.0-24.0 mol % of NiO and 28.0-36.0 mol % of ZnO with 50 ppm or less of P as an impurity, the sintered body having a minimum core loss of 30 kW/m.sup.3 or less at 50 kHz and 50 mT, and the segregation percentage of P in the crystal structure being 1% or less by area. The Ni ferrite sintered body preferably has an average crystal grain size of 3-30 .mu.m, the percentage of crystal grain particles larger than two times the average crystal grain size being preferably 10% or less based on the total number of the crystal grain particles in a crystal structure.Type: GrantFiled: March 13, 1995Date of Patent: April 8, 1997Assignee: Hitachi Ferrite, Ltd.Inventors: Emi Nakagawa, Hitoshi Ueda, Akio Uchikawa, Norikazu Koyuhara