Patents by Inventor Keisuke Yamato

Keisuke Yamato 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).

  • Piezoelectric material, method of manufacturing the same, and piezoelectric device
    Patent number: 8518292
    Abstract: Provided is a piezoelectric material having good piezoelectric properties and a Curie temperature (Tc) of 150° C. or higher, and a piezoelectric device using the piezoelectric material. The piezoelectric material includes a sintered body made of a perovskite-type metal oxide represented by the following general formula (1): xBi(Mg1/2Ti1/2)O3-(1-x)BaTiO3 (1), where x satisfies 0.17?x?0.8, in which an average grain size of grains contained in the sintered body is 0.5 ?m or larger to 10 ?m or smaller, and the sintered body is polycrystalline. In addition, the piezoelectric device includes a piezoelectric material and a pair of electrodes disposed in contact with the piezoelectric material, in which the piezoelectric material is the above-mentioned piezoelectric material.
    Type: Grant
    Filed: September 25, 2012
    Date of Patent: August 27, 2013
    Assignees: Canon Kabushiki Kaisha, University of Yamanashi, National Institute of Advanced Industrial Science & Technology
    Inventors: Hiroshi Saito, Toshihiro Ifuku, Satoshi Wada, Nobuhiro Kumada, Keisuke Yamato, Takashi Iijima, Bong-Yeon Lee
  • PIEZOELECTRIC MATERIAL, METHOD OF MANUFACTURING THE SAME, AND PIEZOELECTRIC DEVICE
    Publication number: 20130020525
    Abstract: Provided is a piezoelectric material having good piezoelectric properties and a Curie temperature (Tc) of 150° C. or higher, and a piezoelectric device using the piezoelectric material. The piezoelectric material includes a sintered body made of a perovskite-type metal oxide represented by the following general formula (1): xBi(Mg1/2Ti1/2)O3-(1-x)BaTiO3 (1), where x satisfies 0.17?x?0.8, in which an average grain size of grains contained in the sintered body is 0.5 ?m or larger to 10 ?m or smaller, and the sintered body is polycrystalline. In addition, the piezoelectric device includes a piezoelectric material and a pair of electrodes disposed in contact with the piezoelectric material, in which the piezoelectric material is the above-mentioned piezoelectric material.
    Type: Application
    Filed: September 25, 2012
    Publication date: January 24, 2013
    Applicants: CANON KABUSHIKI KAISHA, National Institute of Advanced Industrial Science and Technology, UNIVERSITY OF YAMANASHI
    Inventors: Hiroshi Saito, Toshihiro Ifuku, Satoshi Wada, Nobuhiro Kumada, Keisuke Yamato, Takashi Iijima, Bong-Yeon Lee
  • Piezoelectric material, method of manufacturing the same, and piezoelectric device
    Patent number: 8299688
    Abstract: Provided is a piezoelectric material having good piezoelectric properties and a Curie temperature (Tc) of 150° C. or higher, and a piezoelectric device using the piezoelectric material. The piezoelectric material includes a sintered body made of a perovskite-type metal oxide represented by the following general formula (1): xBi(Mg1/2Ti1/2)O3-(1-x)BaTiO3??(1), where x satisfies 0.17?x?0.8, in which an average grain size of grains contained in the sintered body is 0.5 ?m or larger to 10 ?m or smaller, and the sintered body is polycrystalline. In addition, the piezoelectric device includes a piezoelectric material and a pair of electrodes disposed in contact with the piezoelectric material, in which the piezoelectric material is the above-mentioned piezoelectric material.
    Type: Grant
    Filed: March 10, 2010
    Date of Patent: October 30, 2012
    Assignees: Canon Kabushiki Kaisha, University of Yamanashi, National Institute of Advanced Industrial Science and Technology
    Inventors: Hiroshi Saito, Toshihiro Ifuku, Satoshi Wada, Nobuhiro Kumada, Keisuke Yamato, Takashi Iijima, Bong-Yeon Lee
  • Piezoelectric material
    Patent number: 8034250
    Abstract: Provided is a piezoelectric material including a lead-free perovskite-type composite oxide which is excellent in piezoelectric characteristics and temperature characteristics and is represented by the general formula (1): xABO3-yA?BO3-zA?B?O3 in which A is a Bi element; A? is a rare earth element including La; B is at least one element selected from Ti, Zn, Sn and Zr; A? is at least one element selected from Ba, Sr and Ca; B? is at least one element selected from divalent, trivalent, pentavalent, tetravalent, and hexavalent elements; and x is a value of 0.10 or more and 0.95 or less, y is a value of 0 or more and 0.5 or less, and z is a value of 0 or more and 0.7 or less, provided that x+y+z=1.
    Type: Grant
    Filed: March 18, 2009
    Date of Patent: October 11, 2011
    Assignee: Canon Kabushiki Kaisha
    Inventors: Jumpei Hayashi, Zuyi Zhang, Toshihiro Ifuku, Satoshi Wada, Keisuke Yamato, Nobuhiro Kumada, Masaki Azuma, Hiroshi Funakubo, Takashi Iijima, Soichiro Okamura
  • PIEZOELECTRIC MATERIAL
    Publication number: 20110012050
    Abstract: Provided is a piezoelectric material including a lead-free perovskite-type composite oxide which is excellent in piezoelectric characteristics and temperature characteristics and is represented by the general formula (1): xABO3-yA?BO3-zA?B?O3 in which A is a Bi element; A? is a rare earth element including La; B is at least one element selected from Ti, Zn, Sn and Zr; A? is at least one element selected from Ba, Sr and Ca; B? is at least one element selected from divalent, trivalent, pentavalent, tetravalent, and hexavalent elements; and x is a value of 0.10 or more and 0.95 or less, y is a value of 0 or more and 0.5 or less, and z is a value of 0 or more and 0.7 or less, provided that x+y+z=1.
    Type: Application
    Filed: March 18, 2009
    Publication date: January 20, 2011
    Applicants: UNIVERSITY OF YAMANASHI, KYOTO UNIVERSITY, TOKYO INSTITUTE OF TECHNOLOGY, CANON KABUSHIKI KAISHA, Tokyo University of Science Educational Foundation Administrative Organization, National Institute of Advanced Industrial Science and Technology
    Inventors: Jumpei Hayashi, Zuyi Zhang, Toshihiro Ifuku, Satoshi Wada, Keisuke Yamato, Nobuhiro Kumada, Masaki Azuma, Hiroshi Funakubo, Takashi Iijima, Soichiro Okamura
  • PIEZOELECTRIC MATERIAL, METHOD OF MANUFACTURING THE SAME, AND PIEZOELECTRIC DEVICE
    Publication number: 20100231096
    Abstract: Provided is a piezoelectric material having a good piezoelectric property and Curie temperature (Tc) of 150° C. or higher, and a piezoelectric device using the piezoelectric material. The piezoelectric material includes a sintered body made of a perovskite-type metal oxide represented by the following general formula (1): xBi(Mg1/2Ti1/2)O3?(1?x)BaTiO3 (1), where x satisfies 0.17?x?0.8, in which an average grain size of grains contained in the sintered body is 0.5 ?m or larger to 10 ?m or smaller, and the sintered body is polycrystal. In addition, the piezoelectric device includes a piezoelectric material and a pair of electrodes disposed in contact with the piezoelectric material, in which the piezoelectric material is the above-mentioned piezoelectric material.
    Type: Application
    Filed: March 10, 2010
    Publication date: September 16, 2010
    Applicants: Canon Kabushiki Kaisha, University of Yamanashi, National Institute of Advanced Industrial Science and Technology
    Inventors: Hiroshi Saito, Toshihiro Ifuku, Satoshi Wada, Nobuhiro Kumada, Keisuke Yamato, Takashi Iijima, Bong-Yeon Lee