Patents by Inventor Sumiaki Kishimoto

Sumiaki Kishimoto 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: 20210162458
    Abstract: Provided is a driving apparatus that sets a signal wave in a low-frequency region having a frequency of 10 Hz or more and 250 Hz or less as a modulating wave and outputs to a piezoelectric actuator a driving signal having a waveform obtained by modulating an amplitude of a sine wave in a high-frequency region having a frequency of 20 kHz or more and 40 kHz or less with the modulating wave.
    Type: Application
    Filed: November 19, 2020
    Publication date: June 3, 2021
    Applicant: TAIYO YUDEN CO., LTD.
    Inventors: Shigeo ISHII, Takayuki GOTO, Sumiaki KISHIMOTO, Hiroyuki SHIMIZU, Yuichi NAMIKAWA
  • Publication number: 20200313071
    Abstract: A multilayer piezoelectric ceramic is constituted by: piezoelectric ceramic layers which do not contain lead as a constituent element, have a perovskite compound expressed by the composition formula LixNayK1?x?yNbO3 (where 0.02<x?0.1, 0.02<x+y?1) as the primary component, and contain 0.2 to 3.0 mol of Li relative to 100 mol of the primary component; and internal electrode layers which are constituted by a metal that contains silver by 80 percent by mass or more; wherein the multilayer piezoelectric ceramic is such that Li compounds other than the primary component are localized therein. The multilayer piezoelectric element can offer excellent insulating property.
    Type: Application
    Filed: March 27, 2020
    Publication date: October 1, 2020
    Inventors: Tomohiro HARADA, Takayuki GOTO, Ryo ITO, Hiroyuki SHIMIZU, Sumiaki KISHIMOTO
  • Publication number: 20200295253
    Abstract: A multilayer piezoelectric ceramic is such that: its piezoelectric ceramic layers do not contain lead as a constituent element, and have a perovskite compound expressed by the composition formula LixNayK1-x-yNbO3 (where 0.02<?0.1, 0.02<x+y?1), as the primary component; and the internal electrode layers are constituted by a metal containing silver by 80 percent by mass or more, and contain ceramic grains containing the same elements found in the primary component. The multilayer piezoelectric element has a long lifespan, and whose internal electrode layers have a high content percentage of silver.
    Type: Application
    Filed: March 10, 2020
    Publication date: September 17, 2020
    Inventors: Gouki WATANABE, Ryo ITO, Takayuki GOTO, Hiroyuki SHIMIZU, Sumiaki KISHIMOTO
  • Publication number: 20200287124
    Abstract: A piezoelectric ceramic, which does not contain lead as a constituent element, is characterized in that: its primary component is a perovskite compound expressed by the composition formula (Bi0.5?x/2Na0.5?x/2Bax)(Ti1?yMny)O3 (where 0.01?x?0.25, 0.001?y?0.020); and the coefficient of variation (CV) in grain size among the grains contained therein is 35 percent or lower. The piezoelectric ceramic presents an improved dielectric loss tangent tan ?.
    Type: Application
    Filed: February 25, 2020
    Publication date: September 10, 2020
    Inventors: Yuuhei UEYAMA, Tomohiro HARADA, Hiroyuki SHIMIZU, Sumiaki KISHIMOTO, Yukihiro KONISHI
  • Patent number: 10446737
    Abstract: A piezoelectric element which is a single-layer or laminated piezoelectric element has a first electrode, a second electrode, and a piezoelectric ceramic layer. The first electrode and second electrode contain silver by 50 percent by weight or more. The piezoelectric ceramic layer is placed between the first electrode and second electrode, and constituted by a polycrystalline substance of alkali niobate piezoelectric ceramic containing at least one alkali earth metal being calcium, strontium, or barium, and silver. According to this constitution, the electrical resistance and piezoelectric property can be improved, and consequently high reliability and good piezoelectric characteristics can be achieved.
    Type: Grant
    Filed: March 9, 2017
    Date of Patent: October 15, 2019
    Assignee: TAIYO YUDEN CO., LTD.
    Inventors: Keiichi Hatano, Sumiaki Kishimoto, Tomohiro Harada, Yutaka Doshida
  • Patent number: 10418542
    Abstract: A piezoelectric ceramic speaker includes a piezoelectric element using a vibration sheet formed with piezoelectric ceramic having a primary phase constituted by ceramic grains of perovskite crystal structure containing Pb, Nb, Zn, Ti, and Zr, and a secondary phase constituted by ZnO grains, wherein the primary phase is constituted by ceramic grains expressed by a composition formula Pb {(Zr(1-a)Tia)x·(Ni1/3Nb2/3)y·(Zn1/3Nb2/3)z}O3 (where 0<x?0.85, 0?y<1, 0<z<1, x+y+z=1, and 0.45?a?0.60); and an enclosure which encloses the piezoelectric element.
    Type: Grant
    Filed: September 5, 2017
    Date of Patent: September 17, 2019
    Assignee: TAIYO YUDEN CO., LTD.
    Inventors: Gouki Watanabe, Takayuki Goto, Keiichi Hatano, Sumiaki Kishimoto, Yutaka Doshida
  • Publication number: 20190237657
    Abstract: A method of producing a multi-layer piezoelectric ceramic component includes: laminating ceramic green sheets to form a laminate, each of the ceramic green sheets being made of a piezoelectric ceramic material and including an electrically conductive pattern, the electrically conductive pattern including a base metal, being to be an internal electrode, and being formed on an inner side of an outer edge of the ceramic green sheet; sintering the laminate; and cutting the sintered laminate and causing the internal electrodes to be exposed.
    Type: Application
    Filed: January 25, 2019
    Publication date: August 1, 2019
    Inventors: Tomohiro HARADA, Hiroyuki SHIMIZU, Takayuki GOTO, Sumiaki KISHIMOTO, Yukihiro KONISHI
  • Publication number: 20190237652
    Abstract: A multi-layer piezoelectric ceramic component includes: a piezoelectric ceramic body having a cuboid shape, having upper and lower surfaces facing in a thickness direction, first and second end surfaces facing in a length direction, and a pair of side surfaces facing in a width direction, and including first and second regions; first internal electrodes in the first region; second internal electrodes in the second region; third internal electrodes in the first and second regions; a first terminal electrode formed on the first end surface and electrically connected to the first internal electrodes; a second terminal electrode formed on the first end surface and electrically connected to the second internal electrodes; a third terminal electrode formed on the second end surface and electrically connected to the third internal electrodes; a first surface electrode formed on the upper surface; and a second surface electrode formed on the lower surface.
    Type: Application
    Filed: January 25, 2019
    Publication date: August 1, 2019
    Inventors: Tomohiro HARADA, Takayuki GOTO, Hiroyuki SHIMIZU, Sumiaki KISHIMOTO
  • Publication number: 20190237656
    Abstract: A multi-layer piezoelectric ceramic component includes: a piezoelectric ceramic body having a cuboid shape having upper and lower surfaces facing in a thickness direction, first and second end surfaces facing in a length direction, and a pair of side surfaces facing in a width direction; first internal electrodes formed in the piezoelectric ceramic body and drawn to the first end surface; second internal electrodes formed in the piezoelectric ceramic body and drawn to the second end surface; a first terminal electrode formed on the first end surface; and a second terminal electrode formed on the second end surface, the first and second internal electrodes each having a width equal to a distance between the pair of side surfaces, at least one of the pair of side surfaces including a groove extending in non-parallel with the length direction.
    Type: Application
    Filed: January 25, 2019
    Publication date: August 1, 2019
    Inventors: Takayuki GOTO, Hiroyuki SHIMIZU, Sumiaki KISHIMOTO, Yukihiro KONISHI
  • Publication number: 20190237653
    Abstract: A multi-layer piezoelectric ceramic component includes: a piezoelectric ceramic body having a cuboid shape, having upper and lower surfaces facing in a thickness direction, first and second end surfaces facing in a length direction, and a pair of side surfaces facing in a width direction, and including first and second regions; first internal electrodes in the first region; second internal electrodes in the second region; third internal electrodes in the first and second regions; a first terminal electrode formed on the first end surface and electrically connected to the first internal electrodes; a second terminal electrode formed on the first end surface and electrically connected to the second internal electrodes; and a third terminal electrode formed on the second end surface and electrically connected to the third internal electrodes, the first, second, and third internal electrodes each having a width equal to a distance between the pair of side surfaces.
    Type: Application
    Filed: January 25, 2019
    Publication date: August 1, 2019
    Inventors: Sumiaki KISHIMOTO, Hiroyuki SHIMIZU, Tomohiro HARADA, Takayuki GOTO, Yukihiro KONISHI
  • Publication number: 20190044053
    Abstract: A multilayer piezoelectric element includes a ceramic body formed by a piezoelectric ceramic, and having first and second end face facing a longitudinal direction, first and second principal faces facing a thickness direction perpendicular to the longitudinal direction. A pair of external electrodes cover the first and second end faces, extend from the first and second end faces onto the first principal face via ridge parts connecting the end faces with the principal faces, and project in the thickness direction on the first principal face. Multiple internal electrodes are stacked inside the ceramic body and are connected alternately to the pair of external electrodes along the thickness direction. A surface electrode is provided on at least one of the first and second principal faces, and connected to the external electrode different from the one to which the internal electrode adjacent in the thickness direction is connected.
    Type: Application
    Filed: July 30, 2018
    Publication date: February 7, 2019
    Inventors: Hiroshi HAMADA, Hiroyuki SHIMIZU, Sumiaki KISHIMOTO, Yukihiro MATSUI, Shigeo ISHII, Tomohiro HARADA, Yukihiro KONISHI
  • Publication number: 20190027677
    Abstract: A multilayer piezoelectric element includes a ceramic base body, a pair of external electrodes, multiple internal electrodes, and surface electrodes. The ceramic base body is formed by a piezoelectric ceramic. The pair of external electrodes cover a pair of end faces. The multiple internal electrodes are stacked inside the ceramic base body along a thickness direction crossing at right angles with a longitudinal direction, and connected alternately to the pair of external electrodes in the thickness direction. The surface electrodes are provided on a pair of principal faces, respectively, and are each connected to the external electrode different from the one to which the internal electrode adjacent in the thickness direction is connected. The pair of external electrodes have a higher porosity than the surface electrodes.
    Type: Application
    Filed: July 18, 2018
    Publication date: January 24, 2019
    Inventors: Sumiaki KISHIMOTO, Hiroyuki SHIMIZU, Tomohiro HARADA, Yukihiro KONISHI
  • Publication number: 20190027678
    Abstract: A multilayer piezoelectric element includes a ceramic base body, a pair of external electrodes, multiple internal electrodes, and surface electrodes. The pair of external electrodes cover a pair of end faces and extend from the pair of end faces along a pair of principal faces and a pair of side faces. The multiple internal electrodes are stacked inside the ceramic base body along the thickness direction, and are connected alternately to one or the other of the pair of external electrodes along the thickness direction. The surface electrodes extend from the pair of external electrodes along the pair of principal faces, and are each divided in the longitudinal direction at a position near, of the pair of external electrodes, the external electrode to which the internal electrode adjacent to the principal face is connected.
    Type: Application
    Filed: July 12, 2018
    Publication date: January 24, 2019
    Inventors: Sumiaki KISHIMOTO, Hiroshi HAMADA, Hiroyuki SHIMIZU, Yukihiro MATSUI, Tomohiro HARADA, Yukihiro KONISHI
  • Publication number: 20180375010
    Abstract: In an embodiment, a multilayer piezoelectric element includes a multilayer piezoelectric body and multiple internal electrodes. The multilayer piezoelectric body has a pair of principal faces in a first-axis direction, a pair of end faces in a second-axis direction crossing at right angles with the first-axis direction and defining the longitudinal direction, and a pair of side faces in a third-axis direction crossing at right angles with the first-axis direction and second-axis direction. The multiple internal electrodes are placed inside the multilayer piezoelectric body and stacked in the first-axis direction. Among the multiple internal electrodes, a center internal electrode placed at the center part of the multilayer piezoelectric body is such that its first cross-sectional shape, as viewed from the third-axis direction, has undulations greater than the undulations of the second cross-sectional shape of the center internal electrode as viewed from the second-axis direction.
    Type: Application
    Filed: June 18, 2018
    Publication date: December 27, 2018
    Inventors: Sumiaki KISHIMOTO, Hiroyuki SHIMIZU, Tomohiro HARADA, Yukihiro KONISHI
  • Publication number: 20170365772
    Abstract: A piezoelectric ceramic speaker includes a piezoelectric element using a vibration sheet formed with piezoelectric ceramic having a primary phase constituted by ceramic grains of perovskite crystal structure containing Pb, Nb, Zn, Ti, and Zr, and a secondary phase constituted by ZnO grains, wherein the primary phase is constituted by ceramic grains expressed by a composition formula Pb {(Zr(1-a)Tia)x.(Ni1/3Nb2/3)y.(Zn1/3Nb2/3)z}O3 (where 0<x?0.85, 0?y<1, 0<z<1, x+y+z=1, and 0.45?a?0.60); and an enclosure which encloses the piezoelectric element.
    Type: Application
    Filed: September 5, 2017
    Publication date: December 21, 2017
    Inventors: Gouki WATANABE, Takayuki GOTO, Keiichi HATANO, Sumiaki KISHIMOTO, Yutaka DOSHIDA
  • Patent number: 9786833
    Abstract: A piezoelectric ceramic has a primary phase constituted by ceramic grains of perovskite crystal structure containing Pb, Nb, Zn, Ti, and Zr, and a secondary phase constituted by ZnO grains present sporadically in the primary phase. The piezoelectric ceramic of high kr and high specific dielectric constant can be sintered at low temperature and exhibit minimal characteristics variations.
    Type: Grant
    Filed: October 23, 2014
    Date of Patent: October 10, 2017
    Assignee: TAIYO YUDEN CO., LTD.
    Inventors: Gouki Watanabe, Takayuki Goto, Keiichi Hatano, Sumiaki Kishimoto, Yutaka Doshida
  • Publication number: 20170263845
    Abstract: A piezoelectric element which is a single-layer or laminated piezoelectric element has a first electrode, a second electrode, and a piezoelectric ceramic layer. The first electrode and second electrode contain silver by 50 percent by weight or more. The piezoelectric ceramic layer is placed between the first electrode and second electrode, and constituted by a polycrystalline substance of alkali niobate piezoelectric ceramic containing at least one alkali earth metal being calcium, strontium, or barium, and silver. According to this constitution, the electrical resistance and piezoelectric property can be improved, and consequently high reliability and good piezoelectric characteristics can be achieved.
    Type: Application
    Filed: March 9, 2017
    Publication date: September 14, 2017
    Inventors: Keiichi HATANO, Sumiaki KISHIMOTO, Tomohiro HARADA, Yutaka DOSHIDA
  • Patent number: 9450173
    Abstract: A piezoelectric ceramic is constituted by a polycrystal whose main phase is an alkali-containing niobate perovskite structure, where both elemental nickel and elemental manganese are present at the grain boundary of the polycrystal. The piezoelectric ceramic is such that drop in piezoelectric characteristics due to application of high electric field is suppressed.
    Type: Grant
    Filed: June 17, 2013
    Date of Patent: September 20, 2016
    Assignee: TAIYO YUDEN CO., LTD.
    Inventors: Keiichi Hatano, Sumiaki Kishimoto, Yutaka Doshida
  • Publication number: 20150132529
    Abstract: A piezoelectric ceramic has a primary phase constituted by ceramic grains of perovskite crystal structure containing Pb, Nb, Zn, Ti, and Zr, and a secondary phase constituted by ZnO grains present sporadically in the primary phase. The piezoelectric ceramic of high kr and high specific dielectric constant can be sintered at low temperature and exhibit minimal characteristics variations.
    Type: Application
    Filed: October 23, 2014
    Publication date: May 14, 2015
    Inventors: Gouki WATANABE, Takayuki GOTO, Keiichi HATANO, Sumiaki KISHIMOTO, Yutaka DOSHIDA
  • Publication number: 20140055009
    Abstract: A piezoelectric ceramic is constituted by a polycrystal whose main phase is an alkali-containing niobate perovskite structure, where both elemental nickel and elemental manganese are present at the grain boundary of the polycrystal. The piezoelectric ceramic is such that drop in piezoelectric characteristics due to application of high electric field is suppressed.
    Type: Application
    Filed: June 17, 2013
    Publication date: February 27, 2014
    Applicant: TAIYO YUDEN CO., LTD.
    Inventors: Keiichi HATANO, Sumiaki KISHIMOTO, Yutaka DOSHIDA