Patents by Inventor Hitoshi Taguchi

Hitoshi Taguchi 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: 20190206594
    Abstract: This ferrite magnet has a ferrite phase having a magnetoplumbite structure, and an orthoferrite phase, and is characterized in that the composition ratios of the total of each metal element A, R, Fe and Me is represented by expression (1) A1-xRx(Fe12-yMey)z, (in expression (1), A is at least one element selected from Sr, Ba, Ca and Pb; R is at least one element selected from the rare-earth elements (including Y) and Bi, and includes at least La, and Me is Co, or Co and Zn) and in that the content (m) of the orthoferrite phase is 0<m<28.0 in mol %. The invention makes it possible to achieve a ferrite magnet with increased Br.
    Type: Application
    Filed: May 19, 2017
    Publication date: July 4, 2019
    Applicant: TDK CORPORATION
    Inventors: Junnichi NAGAOKA, Hitoshi TAGUCHI
  • Publication number: 20190137340
    Abstract: A transmission type color calibration chart includes a transparent substrate and a color bar group formed on the transparent substrate, wherein the color bar group is constituted by color bars of a plurality of colors containing at least a first color and a second color arranged in a pattern in no particular order, coordinate points of the first color are within a region encompassed by the four points (0.351, 0.649), (0.547, 0.453), (0.380, 0.506) and (0.433, 0.464) on an xy chromaticity diagram, coordinate points of the second color are within a region encompassed by the four points (0.125, 0.489), (0.112, 0.229), (0.270, 0.407) and (0.224, 0.242) on an xy chromaticity diagram, and the transmission spectrum of the first color's color bar and the transmission spectrum of the second color's color bar have peak tops that are respectively separated.
    Type: Application
    Filed: March 30, 2017
    Publication date: May 9, 2019
    Applicant: DAI NIPPON PRINTING CO., LTD.
    Inventors: Yoshihiko OGINO, Yoichi KAJIMURA, Takahiro SAHARA, Kunio TAGUCHI, Yasushi SASAGAWA, Hitoshi MIZUNO, Shota MITANI
  • Publication number: 20190122792
    Abstract: This ferrite magnet has a magnetoplumbite structure and is characterized in that, when representing the composition ratios of the total of each metal element A, R, Fe and Me with expression (1) A1-xRx(Fe12-yMey)z, the Fe2+ content (m) in the ferrite magnet is greater than 0.1 mass % and less than 5.4 mass % (in expression (1), A is at least one element selected from Sr, Ba, Ca and Pb; R is at least one element selected from the rare-earth elements (including Y) and Bi, and includes at least La, and Me is Co, or Co and Zn). The invention makes it possible to achieve a ferrite magnet with increased Br.
    Type: Application
    Filed: May 19, 2017
    Publication date: April 25, 2019
    Applicant: TDK CORPORATION
    Inventors: Junnichi NAGAOKA, Hitoshi TAGUCHI
  • Patent number: 9627112
    Abstract: A sintered ferrite magnet comprises a main phase of an M type Sr ferrite having a hexagonal crystal structure. An amount of Zn is 0.05 to 1.35 mass % in terms of ZnO and M1/M2 is 0.43 or less when an amount of a rare-earth element (R) is M1 in terms of mol and the amount of Zn is M2 in terms of mol.
    Type: Grant
    Filed: March 4, 2015
    Date of Patent: April 18, 2017
    Assignee: TDK CORPORATION
    Inventors: Yoshitaka Murakawa, Naoharu Tanigawa, Yoshihiko Minachi, Hitoshi Taguchi
  • Patent number: 9589713
    Abstract: A sintered ferrite magnet comprises a main phase of an M type Sr ferrite having a hexagonal crystal structure. An amount of Zn is 0.05 to 1.35 mass % in terms of ZnO, the sintered ferrite magnet does not substantially include a rare-earth element (R), and the following Formula (1) is satisfied, where a total amount of Sr, Ba and Ca is M3 in terms of mol, a total amount of Fe, Co, Mn, Zn, Cr and Al is M4 in terms of mol, and an amount of Si is M5 in terms of mol. 0.5?{M3?(M4/12)}/M5?4.8??(1).
    Type: Grant
    Filed: March 4, 2015
    Date of Patent: March 7, 2017
    Assignee: TDK CORPORATION
    Inventors: Yoshitaka Murakawa, Naoharu Tanigawa, Yoshihiko Minachi, Hitoshi Taguchi
  • Patent number: 9530548
    Abstract: Provided is a method for producing Sr ferrite particles for sintered magnets, the method includes: a mixing step of mixing an iron compound, a strontium compound, and an alkali metal compound which includes at least one of K and Na as a constituent element and which does not include Cl and S as the constituent element to prepare a mixture; and a calcining step of firing the mixture at 850° C. to 1100° C. to obtain Sr ferrite particles in which an average particle size of primary particles is 0.2 to 1.0 ?m. In the mixing step, the alkali metal compound is mixed in such a manner that a total amount of K and Na becomes 0.03 to 1.05% by mass in terms of K2O and Na2O with respect to a total amount of a powder of the iron compound and a powder of the strontium compound.
    Type: Grant
    Filed: June 7, 2013
    Date of Patent: December 27, 2016
    Assignee: TDK Corporation
    Inventor: Hitoshi Taguchi
  • Patent number: 9514871
    Abstract: Provided is a sintered ferrite magnet 10 that comprises Sr ferrite having a hexagonal crystal structure, wherein the total amount of Na and K is 0.004 to 0.31% by mass in terms of Na2O and K2O, an amount of Si is 0.3 to 0.94% by mass in terms of SiO2, and the following Expression (1) is satisfied. 1.3?(SrF+Ba+Ca+2Na+2K)/Si?5.7??(1) [In Expression (1), SrF represents an amount of Sr, on a molar basis, other than Sr which constitutes the Sr ferrite, and Ba, Ca, Na, and K represent amounts of respective elements on a molar basis.
    Type: Grant
    Filed: February 20, 2013
    Date of Patent: December 6, 2016
    Assignee: TDK Corporation
    Inventor: Hitoshi Taguchi
  • Patent number: 9460835
    Abstract: Provided is a sintered ferrite magnet 10 that contains Sr ferrite having a hexagonal crystal structure, wherein the total amount of Na and K is 0.01 to 0.09% by mass in terms of Na2O and K2O, an amount of Si is 0.1 to 0.29% by mass in terms of SiO2, and the following Expression (1) is satisfied. 2.5?(SrF+Ba+Ca+2Na+2K)/Si?5.4??(1) [In Expression (1), SrF represents an amount of Sr, on a molar basis, other than Sr which constitutes the Sr ferrite, and Ba, Ca, Na, and K represent amounts of respective elements on a molar basis.
    Type: Grant
    Filed: February 20, 2013
    Date of Patent: October 4, 2016
    Assignee: TDK CORPORATION
    Inventor: Hitoshi Taguchi
  • Publication number: 20150325350
    Abstract: Provided is a sintered ferrite magnet 10 that comprises Sr ferrite having a hexagonal crystal structure, wherein the total amount of Na and K is 0.004 to 0.31% by mass in terms of Na2O and K2O, an amount of Si is 0.3 to 0.94% by mass in terms of SiO2, and the following Expression (1) is satisfied. 1.3?(SrF+Ba+Ca+2Na+2K)/Si?5.7??(1) [In Expression (1), SrF represents an amount of Sr, on a molar basis, other than Sr which constitutes the Sr ferrite, and Ba, Ca, Na, and K represent amounts of respective elements on a molar basis.
    Type: Application
    Filed: February 20, 2013
    Publication date: November 12, 2015
    Inventor: Hitoshi TAGUCHI
  • Publication number: 20150255197
    Abstract: A sintered ferrite magnet comprises a main phase of an M type Sr ferrite having a hexagonal crystal structure. An amount of Zn is 0.05 to 1.35 mass % in terms of ZnO, the sintered ferrite magnet does not substantially include a rare-earth element (R), and the following Formula (1) is satisfied, where a total amount of Sr, Ba and Ca is M3 in terms of mol, a total amount of Fe, Co, Mn, Zn, Cr and Al is M4 in terms of mol, and an amount of Si is M5 in terms of mol. 0.5?{M3?(M4/12)}/M5?4.
    Type: Application
    Filed: March 4, 2015
    Publication date: September 10, 2015
    Inventors: Yoshitaka MURAKAWA, Naoharu TANIGAWA, Yoshihiko MINACHI, Hitoshi TAGUCHI
  • Publication number: 20150255198
    Abstract: A sintered ferrite magnet comprises a main phase of an M type Sr ferrite having a hexagonal crystal structure. An amount of Zn is 0.05 to 1.35 mass % in terms of ZnO and M1/M2 is 0.43 or less when an amount of a rare-earth element (R) is M1 in terms of mol and the amount of Zn is M2 in terms of mol.
    Type: Application
    Filed: March 4, 2015
    Publication date: September 10, 2015
    Inventors: Yoshitaka MURAKAWA, Naoharu TANIGAWA, Yoshihiko MINACHI, Hitoshi TAGUCHI
  • Publication number: 20150125700
    Abstract: Provided is a method for producing Sr ferrite particles for sintered magnets, the method includes: a mixing step of mixing an iron compound, a strontium compound, and an alkali metal compound which includes at least one of K and Na as a constituent element and which does not include Cl and S as the constituent element to prepare a mixture; and a calcining step of firing the mixture at 850° C. to 1100° C. to obtain Sr ferrite particles in which an average particle size of primary particles is 0.2 to 1.0 ?m. In the mixing step, the alkali metal compound is mixed in such a manner that a total amount of K and Na becomes 0.03 to 1.05% by mass in terms of K2O and Na2O with respect to a total amount of a powder of the iron compound and a powder of the strontium compound.
    Type: Application
    Filed: June 7, 2013
    Publication date: May 7, 2015
    Applicant: TDK Corporation
    Inventor: Hitoshi Taguchi
  • Publication number: 20150053883
    Abstract: Provided is a sintered ferrite magnet 10 that contains Sr ferrite having a hexagonal crystal structure, wherein the total amount of Na and K is 0.01 to 0.09% by mass in terms of Na2O and K2O, an amount of Si is 0.1 to 0.29% by mass in terms of SiO2, and the following Expression (1) is satisfied. 2.5?(SrF+Ba+Ca+2Na+2K)/Si?5.4??(1) [In Expression (1), SrF represents an amount of Sr, on a molar basis, other than Sr which constitutes the Sr ferrite, and Ba, Ca, Na, and K represent amounts of respective elements on a molar basis.
    Type: Application
    Filed: February 20, 2013
    Publication date: February 26, 2015
    Inventor: Hitoshi Taguchi
  • Publication number: 20070023970
    Abstract: There is provided a method for producing a La—Co based ferrite magnet by using a polyhydric alcohol as a dispersant, the method capable of suppressing the composition deviation.
    Type: Application
    Filed: June 5, 2006
    Publication date: February 1, 2007
    Inventors: Kiyoyuki Masuzawa, Toshinori Miya, Yasumi Takatsuka, Hitoshi Taguchi, Shunsuke Kurasawa
  • Publication number: 20060219323
    Abstract: The objects of the present invention are to provide a magnetic field molding device, and method for producing a ferrite magnet, or the like, capable of improving yield in a production line and stabilizing product quality, and method for producing a ferrite magnet. In molding in a magnetic field, the mortar-shaped die 19 provided with a plurality of the cavities 13 is heated by the heater member 20 at a given temperature level, under the control of the controller 23. The temperature level is preferably controlled by the controller 23 at 40° C. or higher as mortar-shaped die 19 temperature T1, sensed by the sensor 22. A molding slurry can be kept at a high temperature level in the cavities 13 by heating the mortar-shaped die 19, and can have high dehydration properties and improve product yield.
    Type: Application
    Filed: March 30, 2005
    Publication date: October 5, 2006
    Inventors: Kiyoyuki Masuzawa, Hideo Kurita, Masayuki Ohtsuka, Yasuhiro Nagatsuka, Hitoshi Taguchi
  • Patent number: 7084603
    Abstract: A motor control device that can reduce electrical noise is provided. A motor control device includes an inverter, a current controller, a high frequency wave superpositioner, and a high frequency wave setter. An inverter applies a current to the motor. A current controller outputs a voltage to the inverter according to a current applied to the motor from the inverter. A high frequency wave superpositioner applies a high frequency wave to the voltage from the current controller as a superpositioned wave to infer a position of a rotor in the motor. A high frequency wave setter varies at least one characteristic of the superpositioned wave applied by the high frequency wave superpositioner.
    Type: Grant
    Filed: May 13, 2004
    Date of Patent: August 1, 2006
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hitoshi Taguchi, Takeshi Kitahata, Yosuke Nakazawa
  • Patent number: 6908568
    Abstract: An oxide magnetic material is prepared by wet molding in a magnetic field a slurry containing a particulate oxide magnetic material, water and a polyhydric alcohol having the formula: Cn(OH)nHn+2 wherein n is from 4 to 100 as a dispersant. By improving the orientation in a magnetic field upon wet molding using water, an oxide magnetic material having a high degree of orientation, typically an anisotropic ferrite magnet, is obtained at a high rate of productivity. The method is advantageous from the environmental and economical standpoints.
    Type: Grant
    Filed: June 17, 2002
    Date of Patent: June 21, 2005
    Assignee: TDK Corporation
    Inventors: Kiyoyuki Masuzawa, Hitoshi Taguchi
  • Publication number: 20040257030
    Abstract: A motor control device that can reduce electrical noise is provided. A motor control device includes an inverter, a current controller, a high frequency wave superpositioner, and a high frequency wave setter. An inverter applies a current to the motor. A current controller outputs a voltage to the inverter according to a current applied to the motor from the inverter. A high frequency wave superpositioner applies a high frequency wave to the voltage from the current controller as a superpositioned wave to infer a position of a rotor in the motor. A high frequency wave setter varies at least one characteristic of the superpositioned wave applied by the high frequency wave superpositioner.
    Type: Application
    Filed: May 13, 2004
    Publication date: December 23, 2004
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Hitoshi Taguchi, Takeshi Kitahata, Yosuke Nakazawa
  • Publication number: 20030230832
    Abstract: An oxide magnetic material is prepared by wet molding in a magnetic field a slurry containing a particulate oxide magnetic material, water and a polyhydric alcohol having the formula: Cn(OH)nHn+2 wherein n is from 4 to 100 as a dispersant. By improving the orientation in a magnetic field upon wet molding using water, an oxide magnetic material having a high degree of orientation, typically an anisotropic ferrite magnet, is obtained at a high rate of productivity. The method is advantageous from the environmental and economical standpoints.
    Type: Application
    Filed: June 17, 2002
    Publication date: December 18, 2003
    Applicant: TDK CORPORATION
    Inventors: Kiyoyuki Masuzawa, Hitoshi Taguchi
  • Patent number: 6402980
    Abstract: The present invention provides an oxide magnetic material, which includes a primary phase of a hexagonal ferrite containing metallic elements Ca, R, Fe and M, where M represents at least one element selected from the group including Co, Ni and Zn, and R represents at least one element selected from the group including Bi and rare earth elements including Y, with La being essentially included in R; wherein the proportions of the metallic elements Ca, R, Fe and M with respect to the total amount of the metallic elements are from 1 to 13 atomic % for Ca, from 0.05 to 10 atomic % for R, from 80 to 95 atomic % for Fe, and from 1 to 7 atomic % for M. The present invention also provides ferrite particles, a bonded magnet, a sintered magnet, a process for producing them, and a magnetic recording medium, which contain the oxide magnetic material.
    Type: Grant
    Filed: May 19, 1999
    Date of Patent: June 11, 2002
    Assignee: TDK Corporation
    Inventors: Hitoshi Taguchi, Kiyoyuki Masuzawa, Yoshihiko Minachi, Kazumasa Iida, Miyuki Kawakami