Patents by Inventor Yoshiro TESHIMA

Yoshiro TESHIMA 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: 10840882
    Abstract: A crystal unit includes an AT-cut crystal element that has a planar shape in a rectangular shape and a part as a thick portion. The crystal element includes a first end portion, a depressed portion, the thick portion, and a second end portion in this order from a side of one short side in viewing a cross section taken along a longitudinal direction near a center of the short side. The depressed portion is a depressed portion disposed from the thick portion toward the first end portion side, depressed with a predetermined angle ?a and subsequently bulged, and connected to the first end portion.
    Type: Grant
    Filed: April 23, 2019
    Date of Patent: November 17, 2020
    Assignee: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Koji Toshikawa, Shinobu Yoshida, Hirokazu Iwata, Tetsuya Watanabe, Kazuhiro Hirota, Yoshiro Teshima
  • Patent number: 10763821
    Abstract: A crystal resonator vibrates in a thickness-shear mode. The crystal resonator includes excitation electrodes being disposed on a front surface and a back surface of a crystal element. The excitation electrodes are disposed on the crystal element to have a positional relationship, where a displacement distribution at an edge of the excitation electrode on the front surface is identical to a displacement distribution at an edge of the excitation electrode on the back surface.
    Type: Grant
    Filed: August 21, 2017
    Date of Patent: September 1, 2020
    Assignee: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Shigetaka Kaga, Yoshiro Teshima, Kazuhiro Hirota
  • Publication number: 20190326882
    Abstract: A crystal unit includes an AT-cut crystal element that has a planar shape in a rectangular shape and a part as a thick portion. The crystal element includes a first end portion, a depressed portion, the thick portion, and a second end portion in this order from a side of one short side in viewing a cross section taken along a longitudinal direction near a center of the short side. The depressed portion is a depressed portion disposed from the thick portion toward the first end portion side, depressed with a predetermined angle ?a and subsequently bulged, and connected to the first end portion.
    Type: Application
    Filed: April 23, 2019
    Publication date: October 24, 2019
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Koji TOSHIKAWA, Shinobu YOSHIDA, Hirokazu IWATA, Tetsuya WATANABE, Kazuhiro HIROTA, Yoshiro TESHIMA
  • Patent number: 10277197
    Abstract: A piezoelectric vibrating piece includes a vibrating piece body including a vibrator and at least one pair of excitation electrodes formed on a front surface and a back surface of the vibrator. The vibrating piece body is a twice rotated quartz-crystal vibrating piece. The pair of excitation electrodes are arranged in a Z??-axis direction determined by an X??-axis and obliquely disposed with respect to the Y?-axis direction. The X??-axis is rotated by 260° to 300° counterclockwise about a Y?-axis using a +X?-axis direction as a reference. The pair of excitation electrodes are formed to have respective semicircle shapes including straight line portions extending in the X??-axis direction and to be disposed in a state where the straight line portions overlapping with one another. The straight line portion of the excitation electrode includes an inclined portion that gradually decreases in thickness toward an end portion of the excitation electrode.
    Type: Grant
    Filed: December 22, 2016
    Date of Patent: April 30, 2019
    Assignee: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Shigetaka Kaga, Kazuhiro Hirota, Yoshiro Teshima, Masaaki Nakahara
  • Patent number: 10250225
    Abstract: An AT-cut crystal element includes a crystal element having two side surfaces (namely, a Z?-surface) intersecting with a Z-axis of a crystallographic axis thereof. At least one of the two side surfaces is constituted of three of first to third surfaces. The first to the third surfaces meeting following conditions: the first to the third surfaces intersect with one another in this order and formed by rotating a principal surface of the crystal element by predetermined angles; and expressing the angle of the first surface as ?1, a length of the first surface as D, a thickness of a part of the crystal element having the principal surface as t, and M=D/t, and a conversion percentage as fn (M, (?1)), the ?1 and the M are set such that the conversion percentage fn (M, (?1)) becomes a predetermined value Th or less.
    Type: Grant
    Filed: December 28, 2016
    Date of Patent: April 2, 2019
    Assignee: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Yoshiharu Sato, Yoshiro Teshima, Hirokazu Iwata, Kazuhiro Hirota
  • Publication number: 20180115301
    Abstract: A piezoelectric vibrating piece includes a piezoelectric substrate and excitation electrodes. The piezoelectric substrate is formed in a flat plate shape and vibrates in a thickness-shear vibration mode. The excitation electrodes are disposed on respective both principal surfaces of the piezoelectric substrate. The excitation electrode includes a main thickness portion and an inclined portion. The main thickness portion has a constant thickness. The inclined portion is formed in a peripheral area of the main thickness portion. The inclined portion has a thickness that gradually decreases from a portion contacting the main thickness portion to an outermost periphery of the excitation electrode. An inclination width as a width of the inclined portion has a length that is equal to or more than 0.5 times and equal to or less than three times of a flexural wavelength. The flexural wavelength is a wavelength of a flexure vibration as an unnecessary vibration.
    Type: Application
    Filed: October 16, 2017
    Publication date: April 26, 2018
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Shigetaka KAGA, Yoshiro TESHIMA, Kazuhiro HIROTA
  • Publication number: 20180054181
    Abstract: A crystal resonator vibrates in a thickness-shear mode. The crystal resonator includes excitation electrodes being disposed on a front surface and a back surface of a crystal element. The excitation electrodes are disposed on the crystal element to have a positional relationship, where a displacement distribution at an edge of the excitation electrode on the front surface is identical to a displacement distribution at an edge of the excitation electrode on the back surface.
    Type: Application
    Filed: August 21, 2017
    Publication date: February 22, 2018
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Shigetaka KAGA, Yoshiro TESHIMA, Kazuhiro HIROTA
  • Publication number: 20170187349
    Abstract: An AT-cut crystal element includes a crystal element having two side surfaces (namely, a Z?-surface) intersecting with a Z-axis of a crystallographic axis thereof. At least one of the two side surfaces is constituted of three of first to third surfaces. The first to the third surfaces meeting following conditions: the first to the third surfaces intersect with one another in this order and formed by rotating a principal surface of the crystal element by predetermined angles; and expressing the angle of the first surface as ?1, a length of the first surface as D, a thickness of a part of the crystal element having the principal surface as t, and M=D/t, and a conversion percentage as fn (M, (?1)), the ?1 and the M are set such that the conversion percentage fn (M, (?1)) becomes a predetermined value Th or less.
    Type: Application
    Filed: December 28, 2016
    Publication date: June 29, 2017
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Yoshiharu SATO, Yoshiro TESHIMA, Hirokazu IWATA, Kazuhiro HIROTA
  • Publication number: 20170187348
    Abstract: A piezoelectric vibrating piece includes a vibrating piece body including a vibrator and at least one pair of excitation electrodes formed on a front surface and a back surface of the vibrator. The vibrating piece body is a twice rotated quartz-crystal vibrating piece. The pair of excitation electrodes are arranged in a Z??-axis direction determined by an X??-axis and obliquely disposed with respect to the Y?-axis direction. The X??-axis is rotated by 260° to 300° counterclockwise about a Y?-axis using a +X?-axis direction as a reference. The pair of excitation electrodes are formed to have respective semicircle shapes including straight line portions extending in the X??-axis direction and to be disposed in a state where the straight line portions overlapping with one another. The straight line portion of the excitation electrode includes an inclined portion that gradually decreases in thickness toward an end portion of the excitation electrode.
    Type: Application
    Filed: December 22, 2016
    Publication date: June 29, 2017
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Shigetaka KAGA, Kazuhiro HIROTA, Yoshiro TESHIMA, Masaaki NAKAHARA