Patents by Inventor Yasuharu Miyoshi

Yasuharu Miyoshi 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).

  • Publication number: 20220242292
    Abstract: Disclosed is a seat including: sensors which includes a first cushion sensor provided at a seat cushion in a position corresponding to buttocks of an occupant, a second cushion sensor provided at the seat cushion and located farther frontward than the first cushion sensor, a first back sensor provided at a seat back and located in a lower position thereof, and a second back sensor provided at the seat back and located above the first back sensor; and a controller connected to the sensors and thereby allowed to acquire pressure values from the respective sensors. The controller is configured to identify the motion of the occupant based on outputs of at least two sensors of the first cushion sensor, the second cushion sensor, the first back sensor, and the second back sensor.
    Type: Application
    Filed: April 25, 2022
    Publication date: August 4, 2022
    Inventors: Hiroyuki KAKU, Atsushi KUSANO, Hiroyuki NUMAJIRI, Satoshi FUJITA, Takako MIYOSHI, Munetaka KOWA, Ryuichiro HIROSE, Yoshikazu ITO, Yosuke HIGASHI, Satoshi SUZUKI, Ryosuke SATO, Kento UETAKE, Yasuharu OTSUKA, Satoru KANEDA
  • Patent number: 11398328
    Abstract: 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: Grant
    Filed: March 27, 2018
    Date of Patent: July 26, 2022
    Assignee: HITACHI METALS, LTD.
    Inventors: Yasuharu Miyoshi, Tomoyuki Tada, Norikazu Koyuhara
  • Patent number: 10950375
    Abstract: 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: Grant
    Filed: March 24, 2017
    Date of Patent: March 16, 2021
    Assignee: HITACHI METALS. LTD.
    Inventors: Norikazu Koyuhara, Yasuharu Miyoshi, Tomoyuki Tada, Satoru Tanaka
  • Patent number: 10937579
    Abstract: 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: Grant
    Filed: December 24, 2015
    Date of Patent: March 2, 2021
    Assignee: HITACHI METALS, LTD.
    Inventors: Norikazu Koyuhara, Yasuharu Miyoshi, Tomoyuki Tada, Satoru Tanaka
  • Patent number: 10919809
    Abstract: 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: Grant
    Filed: March 24, 2017
    Date of Patent: February 16, 2021
    Assignee: HITACHI METALS, LTD.
    Inventors: Yasuharu Miyoshi, Norikazu Koyuhara, Tomoyuki Tada
  • Publication number: 20200373047
    Abstract: 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: Application
    Filed: March 27, 2018
    Publication date: November 26, 2020
    Applicant: HITACHI METALS, LTD.
    Inventors: Yasuharu MIYOSHI, Tomoyuki TADA, Norikazu KOYUHARA
  • Patent number: 10304602
    Abstract: 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: Grant
    Filed: August 31, 2015
    Date of Patent: May 28, 2019
    Assignee: Hitachi Metals, Ltd.
    Inventors: Tomoyuki Tada, Yasuharu Miyoshi, Norikazu Koyuhara
  • Publication number: 20190096554
    Abstract: 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: Application
    Filed: March 24, 2017
    Publication date: March 28, 2019
    Applicant: HITACHI METALS, LTD.
    Inventors: Norikazu KOYUHARA, Yasuharu MIYOSHI, Tomoyuki TADA, Satoru TANAKA
  • Publication number: 20190062217
    Abstract: 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: Application
    Filed: March 24, 2017
    Publication date: February 28, 2019
    Applicant: HITACHI METALS, LTD.
    Inventors: Yasuharu MIYOSHI, Norikazu KOYUHARA, Tomoyuki TADA
  • Publication number: 20170352455
    Abstract: 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: Application
    Filed: December 24, 2015
    Publication date: December 7, 2017
    Applicant: HITACHI METALS, LTD.
    Inventors: Norikazu KOYUHARA, Yasuharu MIYOSHI, Tomoyuki TADA, Satoru TANAKA
  • Publication number: 20170278607
    Abstract: 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: Application
    Filed: August 31, 2015
    Publication date: September 28, 2017
    Applicant: Hitachi Metals, Ltd.
    Inventors: Tomoyuki Tada, Yasuharu Miyoshi, Norikazu Koyuhara
  • Patent number: 9434622
    Abstract: A sintered ferrite material, which is obtained by adding Bi2O3 in a range from 0.5% by mass to 3% by mass against 100% by mass of a material having a composition formula of (1-x-y-z)(Li0.5Fe0.5)O.xZnO.yFe2O3.zCuO wherein x, y and z satisfy 0.14?x?0.19, 0.48?y<0.5 and 0?z?0.03 and satisfies resistivity equal to or higher than 106 ?m, initial permeability equal to or higher than 200 and saturation magnetic flux density equal to or higher than 430 mT at 23° C. and equal to or higher than 380 mT at 100° C.
    Type: Grant
    Filed: February 13, 2009
    Date of Patent: September 6, 2016
    Assignee: Hitachi Metals, Ltd.
    Inventors: Tomoyuki Tada, Yasuharu Miyoshi
  • Patent number: 8138959
    Abstract: A radio wave absorption material is characterized to be obtained by firing a ferrite material that is formed by adding an accessory component, 0.1 to 2 wt % of CoO, to an oxide magnetic material containing main components, 30 to 49.5 mol % of Fe2O3, 0.5 to 20 mol % of Mn2O3, 5 to 35 mol % of ZnO, 0.2 to 15 mol % of (Li0.5Fe0.5)O and MnO as the rest. In the above-mentioned composition, part of ZnO may be replaced with 20 mol % or less of CuO. This radio wave absorption material has high strength and humidity stability and has excellent radio wave absorption performance although low in cost.
    Type: Grant
    Filed: October 18, 2007
    Date of Patent: March 20, 2012
    Assignee: Hitachi Metals, Ltd.
    Inventors: Shinroh Itoh, Yasuharu Miyoshi
  • Patent number: 8043522
    Abstract: The invention provides a ferrite material (ferrite sintered body, ferrite powders) having a composition formula of (1-x-y-z)(Li0.5Fe0.5)O.xZnO.y(Mn, Fe)2O3.zCuO, wherein x, y, z, and a satisfy 0.175?x?0.29; 0.475?y?0.51; 0.07?z?0.22; and 0.02?a?0.055 in a case of a=Mn/(Mn+Fe). At least one of Co oxide, Co hydroxide, and Co carbonate in an amount of 1 wt. % or less on the basis of CoO may be contained in 100 wt % of the ferrite material. The ferrite material has a normalized impedance ZN of 40000 ?/m or more at 30 MHz and a normalized impedance ZN of 60000 ?/m or more at 100 MHz as well as a specific resistance of 106 ?m or more.
    Type: Grant
    Filed: August 29, 2008
    Date of Patent: October 25, 2011
    Assignee: Hitachi Metals, Ltd.
    Inventors: Tomoyuki Tada, Yasuharu Miyoshi, Takeshi Yanagihara
  • Patent number: 8018313
    Abstract: The laminate device of the present invention comprises magnetic layers and coil patterns alternately laminated, the coil patterns being connected in a lamination direction to form a coil, and pluralities of magnetic gap layers being disposed in regions in contact with the coil patterns.
    Type: Grant
    Filed: February 10, 2011
    Date of Patent: September 13, 2011
    Assignee: Hitachi Metals, Ltd.
    Inventors: Tomoyuki Tada, Toru Umeno, Yasuharu Miyoshi
  • Publication number: 20110128109
    Abstract: The laminate device of the present invention comprises magnetic layers and coil patterns alternately laminated, the coil patterns being connected in a lamination direction to form a coil, and pluralities of magnetic gap layers being disposed in regions in contact with the coil patterns.
    Type: Application
    Filed: February 10, 2011
    Publication date: June 2, 2011
    Applicant: HITACHI METALS., LTD
    Inventors: Tomoyuki TADA, Toru UMENO, Yasuharu MIYOSHI
  • Patent number: 7907044
    Abstract: The laminate device of the present invention comprises magnetic layers and coil patterns alternately laminated, the coil patterns being connected in a lamination direction to form a coil, and pluralities of magnetic gap layers being disposed in regions in contact with the coil patterns.
    Type: Grant
    Filed: January 31, 2007
    Date of Patent: March 15, 2011
    Assignee: Hitachi Metals, Ltd.
    Inventors: Tomoyuki Tada, Toru Umeno, Yasuharu Miyoshi
  • Patent number: 7892446
    Abstract: A ferrite material in which Bi2O3 is added at 6% by weight or less, and preferably 4% by weight or less, to a ferrite of Li—Zn—(Mn, Fe) containing a specified amount of Mn. In the ferrite material, change of magnetic permeability under high external stress is extremely small, and a core loss under a compression stress is small. By using this ferrite material, an inductor and transformer having small loss even in a state of being molded with resin can be obtained.
    Type: Grant
    Filed: September 12, 2006
    Date of Patent: February 22, 2011
    Assignee: Hitachi Metals, Ltd.
    Inventors: Yasuharu Miyoshi, Tomoyuki Tada
  • Publication number: 20110018675
    Abstract: A sintered ferrite material, which is obtained by adding Bi2O3 in a range from 0.5% by mass to 3% by mass against 100% by mass of a material having a composition formula of (1-x-y-z)(Li0.5Fe0.5)O.xZnO.yFe2O3.zCuO wherein x, y and z satisfy 0.14?x?0.19, 0.48?y<0.5 and 0?z?0.03 and satisfies resistivity equal to or higher than 106 ?m, initial permeability equal to or higher than 200 and saturation magnetic flux density equal to or higher than 430 mT at 23° C. and equal to or higher than 380 mT at 100° C.
    Type: Application
    Filed: February 13, 2009
    Publication date: January 27, 2011
    Inventors: Tomoyuki Tada, Yasuharu Miyoshi
  • Publication number: 20100045505
    Abstract: A radio wave absorption material is characterized to be obtained by firing a ferrite material that is formed by adding an accessory component, 0.1 to 2 wt % of CoO, to an oxide magnetic material containing main components, 30 to 49.5 mol % of Fe2O3, 0.5 to 20 mol % of Mn2O3, 5 to 35 mol % of ZnO, 0.2 to 15 mol % of (Li0.5Fe0.5)O and MnO as the rest. In the above-mentioned composition, part of ZnO may be replaced with 20 mol % or less of CuO. This radio wave absorption material has high strength and humidity stability and has excellent radio wave absorption performance although low in cost.
    Type: Application
    Filed: October 18, 2007
    Publication date: February 25, 2010
    Applicant: HATACHI METALS, LTD.
    Inventors: Shinroh Itoh, Yasuharu Miyoshi