Patents by Inventor Yuiko HIROSE

Yuiko HIROSE 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: 11005028
    Abstract: A piezoelectric composition including copper, germanium and a complex oxide represented by a compositional formula KmNbO3 and having a perovskite structure, in which m in the compositional formula satisfies 0.970?m?0.999, and with respect to 1 mol of the complex oxide, x mol % of copper in terms of a copper element and y mol % of germanium in terms of a germanium element are contained, wherein x satisfies 0.100?x?1.000 and y satisfies 0.000<y?1.500.
    Type: Grant
    Filed: March 19, 2019
    Date of Patent: May 11, 2021
    Assignee: TDK CORPORATION
    Inventors: Hiroki Katoh, Yuiko Hirose, Masakazu Hirose, Mirai Ishida
  • Publication number: 20210091298
    Abstract: A piezoelectric composition containing: a complex oxide having a perovskite structure represented by a general formula of ABO3; copper; and one or more elements selected from the group consisting of chromium, nickel and zinc, in which in ABO3, an A-site element is potassium and a B-site element is niobium, or niobium and tantalum, with respect to 1 mol of the complex oxide, a content ratio of the copper is ? mol % in terms of CuO, a content ratio of one or more elements selected from the group consisting of chromium, nickel and zinc is ? mol % in terms of CrO3/2, NiO, ZnO, ? satisfies a relationship of 0.2???2.5, and ? satisfies a relationship of 0.2???2.0.
    Type: Application
    Filed: March 19, 2019
    Publication date: March 25, 2021
    Applicant: TDK CORPORATION
    Inventors: Masakazu HIROSE, Yuiko HIROSE, Hiroki KATOH, Tamotsu SASAKI, Yuji UMEDA
  • Publication number: 20200313072
    Abstract: A piezoelectric composition having a complex oxide including potassium and niobium, in which the complex oxide has a first phase represented by a compositional formula KNbO3, and one or two phases selected from a second phase represented by a compositional formula K4Nb6O17 and a third phase represented by a compositional formula KNb3O8.
    Type: Application
    Filed: March 20, 2018
    Publication date: October 1, 2020
    Applicant: TDK CORPORATION
    Inventors: Yuiko HIROSE, Hiroki KATOH, Masakazu HIROSE
  • Publication number: 20200295252
    Abstract: A piezoelectric composition including copper and a complex oxide having a perovskite structure represented by a general formula ABO3, in which an A site element in the ABO3 is potassium or potassium and sodium, a B site element in the ABO3 is niobium or niobium and tantalum, the copper is included in n mol % in terms of a copper element with respect to 1 mol of the complex oxide, and n satisfies 0.100?n?1.000.
    Type: Application
    Filed: March 20, 2018
    Publication date: September 17, 2020
    Applicant: TDK CORPORATION
    Inventors: Hiroki KATOH, Yuiko HIROSE, Masakazu HIROSE
  • Publication number: 20200243748
    Abstract: A piezoelectric composition including manganese and a complex oxide having a perovskite structure represented by a general formula ABO3, wherein an A site element in the ABO3 is potassium or potassium and sodium, a B site element in the ABO3 is niobium, a concentration distribution of the manganese has a variation, and the variation shows a CV value of 35% or more and 440% or less.
    Type: Application
    Filed: March 20, 2018
    Publication date: July 30, 2020
    Applicant: TDK CORPORATION
    Inventors: Masakazu HIROSE, Yuiko HIROSE, Hiroki KATOH
  • Publication number: 20190288181
    Abstract: A piezoelectric composition including copper, germanium and a complex oxide represented by a compositional formula KmNbO3 and having a perovskite structure, in which m in the compositional formula satisfies 0.970? m?0.999, and with respect to 1 mol of the complex oxide, x mol % of copper in terms of a copper element and y mol % of germanium in terms of a germanium element are contained, wherein x satisfies 0.100 ?x?1.000 and y satisfies 0.000<y?1.500.
    Type: Application
    Filed: March 19, 2019
    Publication date: September 19, 2019
    Applicant: TDK CORPORATION
    Inventors: Hiroki KATOH, Yuiko HIROSE, Masakazu HIROSE, Mirai ISHIDA
  • Patent number: 10199557
    Abstract: A piezoelectric film containing (K,Na)NbO3 as the main component, wherein, when a surface of the piezoelectric film was observed in a field view within a specified range, a plurality of first crystals and a plurality of second crystals are arranged in the surface of the piezoelectric film, wherein, the first crystal has a slender shape orientating toward the first orientation along the surface, and the second crystal has a slender shape orientating toward the second orientation which crosses with the first orientation along the surface.
    Type: Grant
    Filed: September 29, 2016
    Date of Patent: February 5, 2019
    Assignee: TDK CORPORATION
    Inventors: Yuiko Hirose, Shirou Ootsuki
  • Patent number: 9837596
    Abstract: A piezoelectric element exhibiting a small leakage current density and high reliability as compared with a KNN thin film piezoelectric element in the related art is provided. The piezoelectric element is characterized by including a lower electrode, a piezoelectric layer primarily made from potassium-sodium niobate, which is a perovskite type compound represented by a general formula ABO3, and an upper electrode, wherein the piezoelectric layer is present between the lower electrode and the upper electrode, and the piezoelectric layer has the value determined by dividing the maximum value of intensity of a diffraction peak, where the angle of 2? is within the range of 21.1°?2??23.4° in the X-ray diffraction pattern (2?/?), by the intensity of a diffraction peak, where 2? is within the range of 30.1°?2??33.3°, of 0.04 or less.
    Type: Grant
    Filed: June 13, 2014
    Date of Patent: December 5, 2017
    Assignee: TDK CORPORATION
    Inventors: Ryu Ohta, Hitoshi Sakuma, Yuiko Hirose
  • Publication number: 20170098756
    Abstract: A piezoelectric film containing (K,Na)NbO3 as the main component, wherein, when a surface of the piezoelectric film was observed in a field view within a specified range, a plurality of first crystals and a plurality of second crystals are arranged in the surface of the piezoelectric film, wherein, the first crystal has a slender shape orientating toward the first orientation along the surface, and the second crystal has a slender shape orientating toward the second orientation which crosses with the first orientation along the surface.
    Type: Application
    Filed: September 29, 2016
    Publication date: April 6, 2017
    Applicant: TDK CORPORATION
    Inventors: Yuiko HIROSE, Shirou OOTSUKI
  • Patent number: 9614463
    Abstract: A piezoelectric device is provided with a piezoelectric element including a piezoelectric layer exhibiting a polarizability ? smaller than 1×10?9 (C/(V·m)) in the case where an electric field is applied until polarization is saturated and a circuit having a means to set a minimum value of a drive electric field to become larger than a positive coercive electric field of the above-described piezoelectric layer and a means to set a maximum value of the above-described drive electric field to become smaller than (Pm?(maximum value of polarization)?Pr?(quasi-remanent polarization))/(1×10?9) and, therefore, an object is to drive the piezoelectric element in an electric field range in which maximum piezoelectric characteristics are obtained, improve the characteristics of the piezoelectric device, and enhance the reliability.
    Type: Grant
    Filed: February 10, 2014
    Date of Patent: April 4, 2017
    Assignee: TDK CORPORATION
    Inventors: Yuiko Hirose, Yasuhiro Aida
  • Publication number: 20150364670
    Abstract: A piezoelectric element exhibiting a small leakage current density and high reliability as compared with a KNN thin film piezoelectric element in the related art is provided. The piezoelectric element is characterized by including a lower electrode, a piezoelectric layer primarily made from potassium-sodium niobate, which is a perovskite type compound represented by a general formula ABO3, and an upper electrode, wherein the piezoelectric layer is present between the lower electrode and the upper electrode, and the piezoelectric layer has the value determined by dividing the maximum value of intensity of a diffraction peak, where the angle of 2? is within the range of 21.1°?2??23.4° in the X-ray diffraction pattern (2?/?), by the intensity of a diffraction peak, where 2? is within the range of 30.1°?2??33.3°, of 0.04 or less.
    Type: Application
    Filed: June 13, 2014
    Publication date: December 17, 2015
    Inventors: Ryu OHTA, Hitoshi SAKUMA, Yuiko HIROSE
  • Publication number: 20150229238
    Abstract: A piezoelectric device is provided with a piezoelectric element including a piezoelectric layer exhibiting a polarizability ? smaller than 1×10?9 (C/(V·m)) in the case where an electric field is applied until polarization is saturated and a circuit having a means to set a minimum value of a drive electric field to become larger than a positive coercive electric field of the above-described piezoelectric layer and a means to set a maximum value of the above-described drive electric field to become smaller than (Pm? (maximum value of polarization)?Pr? (quasi-remanent polarization))/(1×10?9) and, therefore, an object is to drive the piezoelectric element in an electric field range in which maximum piezoelectric characteristics are obtained, improve the characteristics of the piezoelectric device, and enhance the reliability.
    Type: Application
    Filed: February 10, 2014
    Publication date: August 13, 2015
    Inventors: Yuiko HIROSE, Yasuhiro AIDA