Patents by Inventor Tomoyuki Tada

Tomoyuki Tada 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: 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: 20180171104
    Abstract: A polyacetal resin composition containing 100 parts by weight of a polyacetal resin; from 0.01 part by weight to 0.5 part by weight (inclusive) of a hindered phenolic antioxidant; from 0.002 part by weight to 0.02 part by weight (inclusive) of an aliphatic carboxylic acid containing 2 or more carboxyl groups and having 4 or more carbon atoms; and from 0.01 part by weight to 0.1 part by weight (inclusive) of a fatty acid calcium salt. The molar ratio of the fatty acid calcium salt to the aliphatic carboxylic acid may be from 0.5 to 5 (inclusive).
    Type: Application
    Filed: March 2, 2016
    Publication date: June 21, 2018
    Inventors: Tomohiro MONMA, Hatsuhiko HARASHINA, 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: 9651478
    Abstract: The analyzer according to the embodiment comprises an irradiation optical part that irradiates a mixture inside reaction tubes with light from a light source. Moreover, a detection optical part detects light transmitted through the mixture. Moreover, the irradiation optical part comprises a first optical element in which the light source is disposed at the front focal position and that concentrates light from the light source. Moreover, a second optical element guides light transmitted through the first optical element to the reaction tubes. In addition, an incident numerical aperture adjustment member is provided at the rear side of the first optical element and adjusts the numerical aperture when light from the light source is incident on the reaction tubes.
    Type: Grant
    Filed: January 10, 2012
    Date of Patent: May 16, 2017
    Assignee: TOSHIBA MEDICAL SYSTEMS CORPORATION
    Inventors: Shoichi Kanayama, Tomoyuki Tada, Naotada Okada
  • 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: 9368805
    Abstract: The present invention provides a catalyst for a polymer electrolyte fuel cell including catalyst particles made of platinum supported on a carbon powder carrier, wherein the carbon powder carrier includes 0.7 to 3.0 mmol/g (based on the weight of the carrier) of a hydrophilic group bonded thereto; and the platinum particles have an average particle size of 3.5 to 8.0 nm and the platinum specific surface area based on CO adsorption (COMSA) of 40 to 100 m2/g. The catalyst for a polymer electrolyte fuel cell according to the present invention is a catalyst excellent in initial activity and satisfactory in durability.
    Type: Grant
    Filed: December 2, 2011
    Date of Patent: June 14, 2016
    Assignee: TANAKA KIKINZOKU KOGYO K.K
    Inventors: Tomoyuki Tada, Koichi Matsutani, Takeshi Kaieda, Katsuichiro Hayakawa, Hitoshi Nakajima
  • Patent number: 8570142
    Abstract: An evaluation processing portion changes a user level of a user, in a user level storing portion, to a value that is equal to a region level when an evaluation result indicates that entry is authorized.
    Type: Grant
    Filed: September 20, 2011
    Date of Patent: October 29, 2013
    Assignee: Azbil Corporation
    Inventor: Tomoyuki Tada
  • Publication number: 20130244137
    Abstract: The present invention provides a catalyst for a polymer electrolyte fuel cell including catalyst particles made of platinum supported on a carbon powder carrier, wherein the carbon powder carrier includes 0.7 to 3.0 mmol/g (based on the weight of the carrier) of a hydrophilic group bonded thereto; and the platinum particles have an average particle size of 3.5 to 8.0 nm and the platinum specific surface area based on CO adsorption (COMSA) of 40 to 100 m2/g. The catalyst for a polymer electrolyte fuel cell according to the present invention is a catalyst excellent in initial activity and satisfactory in durability.
    Type: Application
    Filed: December 2, 2011
    Publication date: September 19, 2013
    Applicant: TANAKA KIKINZOKU KOGYO K.K.
    Inventors: Tomoyuki Tada, Koichi Matsutani, Takeshi Kaieda, Katsuichiro Hayakawa, Hitoshi Nakajima
  • Publication number: 20120177538
    Abstract: The analyzer according to the embodiment comprises an irradiation optical part that irradiates a mixture inside reaction tubes with light from a light source. Moreover, a detection optical part detects light transmitted through the mixture. Moreover, the irradiation optical part comprises a first optical element in which the light source is disposed at the front focal position and that concentrates light from the light source. Moreover, a second optical element guides light transmitted through the first optical element to the reaction tubes. In addition, an incident numerical aperture adjustment member is provided at the rear side of the first optical element and adjusts the numerical aperture when light from the light source is incident on the reaction tubes.
    Type: Application
    Filed: January 10, 2012
    Publication date: July 12, 2012
    Applicants: TOSHIBA MEDICAL SYSTEMS CORPORATION, Kabushiki Kaisha Toshiba
    Inventors: Shoichi Kanayama, Tomoyuki Tada, Naotada Okada
  • Publication number: 20120105503
    Abstract: According to one embodiment, an illumination device includes a light guide plate and a plurality of light sources. The light guide plate includes a light emitting surface. The plurality of light sources whose light emission luminance can be controlled individually, the light sources being configured to supply light from an edge portion of the light guide plate into the light guide plate. A luminance distribution of light injected from the light sources into the light guide plate and emitted from the light emitting surface is obtained by a function such that relative intensity relative to a DC component in a spatial frequency region is less than or equal to a first threshold in a spatial frequency region having a value of one or more. Source-to-source distance of the light sources is optimized by the luminance distribution of the light.
    Type: Application
    Filed: October 31, 2011
    Publication date: May 3, 2012
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Tomoyuki TADA, Naotada Okada, Toshitake Kitagawa, Ryosuke Nonaka, Masahiro Baba, Go Ito
  • Publication number: 20120075056
    Abstract: When an evaluation result by an evaluation processing portion indicates that entry is authorized, the evaluation processing portion obtains a resident region of the user from a user information storing portion and obtains a movement destination resident user count of the movement destination region of the user from a region information storing portion, and if the user is a resident user of the movement destination region and the movement destination resident user count prior to entry by the user is zero, instructs an equipment operation controlling portion to start operation of the related equipment in the movement destination region.
    Type: Application
    Filed: September 21, 2011
    Publication date: March 29, 2012
    Applicant: YAMATAKE CORPORATION
    Inventor: Tomoyuki Tada
  • Publication number: 20120075055
    Abstract: An evaluation processing portion changes a user level of a user, in a user level storing portion, to a value that is equal to a region level when an evaluation result indicates that entry is authorized.
    Type: Application
    Filed: September 20, 2011
    Publication date: March 29, 2012
    Applicant: YAMATAKE CORPORATION
    Inventor: Tomoyuki Tada
  • 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: 7910509
    Abstract: The invention intends to provide a dielectric porcelain composition for use in electronic devices, in which the relative dielectric constant ?r is high, the Qf value is high and, the temperature coefficient ?f can be controlled while maintaining the temperature coefficient ?f at the resonant frequency small and the Qf value high. According to the invention, when, in an LnAlO3—CaTiO3-based dielectric porcelain composition, a molar ratio of LnAlO3 and CaTiO3 is optimized and Al is substituted by a slight amount of Ga, a structure that has an LnAlO3—CaTiO3 solid solution as a main phase and a solid solution of Al—Ga-based oxide as a secondary phase and does not substantially contain ?-Al2O3 in the structure can be obtained, and the temperature coefficient ?f can be controlled while maintaining the temperature coefficient ?f at the resonant frequency small and the Qf value high.
    Type: Grant
    Filed: June 24, 2005
    Date of Patent: March 22, 2011
    Assignee: Hitachi Metals, Ltd.
    Inventors: Tomoyuki Tada, Kazuhiro Nishikawa, Kazuya Toji, Kazuhiro Kura, Takeshi Shimada
  • 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