Patents by Inventor Yu TAKYOH

Yu TAKYOH 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: 11422511
    Abstract: An electronic watch with a two-coil stepper motor including: a magnetized rotor; a stator including: first and second stator magnetic-pole portions, which are formed so as to oppose to each other through the rotor; and a third stator magnetic-pole portion, which is formed between the first stator magnetic-pole portion and the second stator magnetic-pole portion so as to face the rotor; a coil A to be magnetically coupled to the first stator magnetic-pole portion and the third stator magnetic-pole portion; and a coil B to be magnetically coupled to the second stator magnetic-pole portion and the third stator magnetic-pole portion; and a high-speed drive pulse generation circuit configured to output a drive pulse for driving the rotor to the coil A or the coil B, and wherein the rotor is rotationally driven in increments of 360° due to a drive pulse train formed of the plurality of drive pulses.
    Type: Grant
    Filed: June 29, 2020
    Date of Patent: August 23, 2022
    Assignee: CITIZEN WATCH CO., LTD.
    Inventors: Yu Takyoh, Toshiaki Fukushima, Toshinari Maeda, Daisuke Iri, Daisuke Matsuoh, Masatoshi Nishida
  • Patent number: 11378920
    Abstract: To reliably rotate a step motor while reducing power consumption, a step motor driving device includes a step motor that includes a rotor, stator, coil, driver circuit that outputs a measurement drive signal to the coil, phase detecting circuit that detects a counter-electromotive current that is generated in the coil after the output of the measurement drive signal and determines whether a phase of the rotor is a desired phase based on the detected counter-electromotive current, and a control unit that, if the phase is the desired phase, controls the step motor by a first driving method in which the drive circuit outputs a first drive signal for rotating the rotor by one step, and, if not, controls the step motor by a second driving method different from the first driving method so as to restrict the rotation of the rotor.
    Type: Grant
    Filed: June 21, 2019
    Date of Patent: July 5, 2022
    Assignee: CITIZEN WATCH CO., LTD.
    Inventor: Yu Takyoh
  • Publication number: 20210263474
    Abstract: To reliably rotate a step motor while reducing power consumption, a step motor driving device includes a step motor that includes a rotor, stator, coil, driver circuit that outputs a measurement drive signal to the coil, phase detecting circuit that detects a counter-electromotive current that is generated in the coil after the output of the measurement drive signal and determines whether a phase of the rotor is a desired phase based on the detected counter-electromotive current, and a control unit that, if the phase is the desired phase, controls the step motor by a first driving method in which the drive circuit outputs a first drive signal for rotating the rotor by one step, and, if not, controls the step motor by a second driving method different from the first driving method so as to restrict the rotation of the rotor.
    Type: Application
    Filed: June 21, 2019
    Publication date: August 26, 2021
    Inventor: Yu TAKYOH
  • Patent number: 11086273
    Abstract: Provided is a drive circuit for a two-coil stepper motor, including: a rotor; a stator including first, second, and third stator magnetic-pole portions; a coil A to be magnetically coupled to the first stator magnetic-pole portion and the third stator magnetic-pole portion; a coil B to be magnetically coupled to the second stator magnetic-pole portion and the third stator magnetic-pole portion; a drive pulse generation circuit configured to output a drive pulse; a detection pulse generation circuit configured to output a detection pulse for detecting counter-electromotive currents generated in the coil A and the coil B; and a rotation detection circuit configured to receive a detection signal generated due to the detection pulse as input to determine whether or not the rotor has rotated.
    Type: Grant
    Filed: September 24, 2019
    Date of Patent: August 10, 2021
    Assignee: CITIZEN WATCH CO., LTD.
    Inventors: Yu Takyoh, Toshiaki Fukushima, Toshinari Maeda, Daisuke Iri, Daisuke Matsuoh
  • Publication number: 20200333749
    Abstract: An electronic watch with a two-coil stepper motor including: a magnetized rotor; a stator including: first and second stator magnetic-pole portions, which are formed so as to oppose to each other through the rotor; and a third stator magnetic-pole portion, which is formed between the first stator magnetic-pole portion and the second stator magnetic-pole portion so as to face the rotor; a coil A to be magnetically coupled to the first stator magnetic-pole portion and the third stator magnetic-pole portion; and a coil B to be magnetically coupled to the second stator magnetic-pole portion and the third stator magnetic-pole portion; and a high-speed drive pulse generation circuit configured to output a drive pulse for driving the rotor to the coil A or the coil B, and wherein the rotor is rotationally driven in increments of 360° due to a drive pulse train formed of the plurality of drive pulses.
    Type: Application
    Filed: June 29, 2020
    Publication date: October 22, 2020
    Inventors: Yu TAKYOH, Toshiaki FUKUSHIMA, Toshinari MAEDA, Daisuke IRI, Daisuke MATSUOH, Masatoshi NISHIDA
  • Patent number: 10754299
    Abstract: An electronic watch with a two-coil stepper motor including: a magnetized rotor; a stator including: first and second stator magnetic-pole portions, which are formed so as to oppose to each other through the rotor; and a third stator magnetic-pole portion, which is formed between the first stator magnetic-pole portion and the second stator magnetic-pole portion so as to face the rotor; a coil A to be magnetically coupled to the first stator magnetic-pole portion and the third stator magnetic-pole portion; and a coil B to be magnetically coupled to the second stator magnetic-pole portion and the third stator magnetic-pole portion; and a high-speed drive pulse generation circuit configured to output a drive pulse for driving the rotor to the coil A or the coil B, and wherein the rotor is rotationally driven in increments of 360° due to a drive pulse train formed of the plurality of drive pulses.
    Type: Grant
    Filed: February 15, 2017
    Date of Patent: August 25, 2020
    Assignee: CITIZEN WATCH CO., LTD.
    Inventors: Yu Takyoh, Toshiaki Fukushima, Toshinari Maeda, Daisuke Iri, Daisuke Matsuoh, Masatoshi Nishida
  • Patent number: 10545459
    Abstract: Provided is a drive circuit for a two-coil stepper motor, including: a rotor; a stator including first, second, and third stator magnetic-pole portions; a coil A to be magnetically coupled to the first stator magnetic-pole portion and the third stator magnetic-pole portion; a coil B to be magnetically coupled to the second stator magnetic-pole portion and the third stator magnetic-pole portion; a drive pulse generation circuit configured to output a drive pulse; a detection pulse generation circuit configured to output a detection pulse for detecting counter-electromotive currents generated in the coil A and the coil B; and a rotation detection circuit configured to receive a detection signal generated due to the detection pulse as input to determine whether or not the rotor has rotated.
    Type: Grant
    Filed: September 9, 2016
    Date of Patent: January 28, 2020
    Assignee: Citizen Watch Co., LTD.
    Inventors: Yu Takyoh, Toshiaki Fukushima, Toshinari Maeda, Daisuke Iri, Daisuke Matsuoh
  • Publication number: 20200019124
    Abstract: Provided is a drive circuit for a two-coil stepper motor, including: a rotor; a stator including first, second, and third stator magnetic-pole portions; a coil A to be magnetically coupled to the first stator magnetic-pole portion and the third stator magnetic-pole portion; a coil B to be magnetically coupled to the second stator magnetic-pole portion and the third stator magnetic-pole portion; a drive pulse generation circuit configured to output a drive pulse; a detection pulse generation circuit configured to output a detection pulse for detecting counter-electromotive currents generated in the coil A and the coil B; and a rotation detection circuit configured to receive a detection signal generated due to the detection pulse as input to determine whether or not the rotor has rotated.
    Type: Application
    Filed: September 24, 2019
    Publication date: January 16, 2020
    Inventors: Yu TAKYOH, Toshiaki FUKUSHIMA, Toshinari MAEDA, Daisuke IRI, Daisuke MATSUOH
  • Patent number: 10331084
    Abstract: An electronic watch includes: a step motor; a driving pulse generator circuit configured to output a driving pulse for driving the step motor; a detection pulse generator circuit configured to output a detection pulse for detecting rotation of the step motor; a correction pulse generator circuit configured to output a correction pulse; a pulse selection circuit configured to select and output the driving pulse, the detection pulse, and the correction pulse; a driver circuit configured to supply to the step motor the outputs from the pulse selection circuit; and a rotation detection circuit configured to receive a detection signal generated by the detection pulse to judge rotation of the step motor. The electronic watch further includes a driving interval switch circuit configured to switch a driving interval of the driving pulse between a normal driving interval and a high-speed driving interval.
    Type: Grant
    Filed: September 29, 2015
    Date of Patent: June 25, 2019
    Assignee: CITIZEN WATCH CO., LTD.
    Inventors: Daisuke Iri, Yu Takyoh
  • Publication number: 20190041804
    Abstract: An electronic watch with a two-coil stepper motor including: a magnetized rotor; a stator including: first and second stator magnetic-pole portions, which are formed so as to oppose to each other through the rotor; and a third stator magnetic-pole portion, which is formed between the first stator magnetic-pole portion and the second stator magnetic-pole portion so as to face the rotor; a coil A to be magnetically coupled to the first stator magnetic-pole portion and the third stator magnetic-pole portion; and a coil B to be magnetically coupled to the second stator magnetic-pole portion and the third stator magnetic-pole portion; and a high-speed drive pulse generation circuit configured to output a drive pulse for driving the rotor to the coil A or the coil B, and wherein the rotor is rotationally driven in increments of 360° due to a drive pulse train formed of the plurality of drive pulses.
    Type: Application
    Filed: February 15, 2017
    Publication date: February 7, 2019
    Inventors: Yu TAKYOH, Toshiaki FUKUSHIMA, Toshinari MAEDA, Daisuke IRI, Daisuke MATSUOH, Masatoshi NISHIDA
  • Patent number: 10197972
    Abstract: Provided is a drive circuit for a two-coil stepper motor, including a rotor that is magnetized to an N-pole and an S-pole, first, second, and third stator magnetic-pole portions, a coil A, and a coil B. The drive circuit includes a drive pulse generation circuit configured to output a drive pulse (SP) for driving the coil A and the coil B, a detection pulse generation circuit configured to output a detection pulse (CP) to the coil A and the coil B in order to detect counter-electromotive currents generated in the coil A and the coil B along with a movement of the rotor after the rotor is driven based on the drive pulse, and a detection circuit configured to receive a detection signal (CS) generated based on the detection pulse as input, to thereby detect the movement of the rotor. At least one of the detection pulse to the coil A or the detection pulse to the coil B is output.
    Type: Grant
    Filed: December 24, 2015
    Date of Patent: February 5, 2019
    Assignee: CITIZEN WATCH CO., LTD.
    Inventors: Toshiaki Fukushima, Toshinari Maeda, Yu Takyoh, Daisuke Iri
  • Publication number: 20180246471
    Abstract: Provided is a drive circuit for a two-coil stepper motor, including: a rotor; a stator including first, second, and third stator magnetic-pole portions; a coil A to be magnetically coupled to the first stator magnetic-pole portion and the third stator magnetic-pole portion; a coil B to be magnetically coupled to the second stator magnetic-pole portion and the third stator magnetic-pole portion; a drive pulse generation circuit configured to output a drive pulse; a detection pulse generation circuit configured to output a detection pulse for detecting counter-electromotive currents generated in the coil A and the coil B; and a rotation detection circuit configured to receive a detection signal generated due to the detection pulse as input to determine whether or not the rotor has rotated.
    Type: Application
    Filed: September 9, 2016
    Publication date: August 30, 2018
    Inventors: Yu TAKYOH, Toshiaki FUKUSHIMA, Toshinari MAEDA, Daisuke IRI, Daisuke MATSUOH
  • Publication number: 20170357216
    Abstract: Provided is a drive circuit for a two-coil stepper motor, including a rotor that is magnetized to an N-pole and an S-pole, first, second, and third stator magnetic-pole portions, a coil A, and a coil B. The drive circuit includes a drive pulse generation circuit configured to output a drive pulse (SP) for driving the coil A and the coil B, a detection pulse generation circuit configured to output a detection pulse (CP) to the coil A and the coil B in order to detect counter-electromotive currents generated in the coil A and the coil B along with a movement of the rotor after the rotor is driven based on the drive pulse, and a detection circuit configured to receive a detection signal (CS) generated based on the detection pulse as input, to thereby detect the movement of the rotor. At least one of the detection pulse to the coil A or the detection pulse to the coil B is output.
    Type: Application
    Filed: December 24, 2015
    Publication date: December 14, 2017
    Inventors: Toshiaki FUKUSHIMA, Toshinari MAEDA, Yu TAKYOH, Daisuke IRI
  • Publication number: 20170227932
    Abstract: An electronic watch includes: a step motor; a driving pulse generator circuit configured to output a driving pulse for driving the step motor; a detection pulse generator circuit configured to output a detection pulse for detecting rotation of the step motor; a correction pulse generator circuit configured to output a correction pulse; a pulse selection circuit configured to select and output the driving pulse, the detection pulse, and the correction pulse; a driver circuit configured to supply to the step motor the outputs from the pulse selection circuit; and a rotation detection circuit configured to receive a detection signal generated by the detection pulse to judge rotation of the step motor. The electronic watch further includes a driving interval switch circuit configured to switch a driving interval of the driving pulse between a normal driving interval and a high-speed driving interval.
    Type: Application
    Filed: September 29, 2015
    Publication date: August 10, 2017
    Inventors: Daisuke IRI, Yu TAKYOH