Patents by Inventor Kazumi Sakumoto

Kazumi Sakumoto 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: 20220291637
    Abstract: A stepping motor control device configured to drive a stepping motor having a rotor and a coil includes: a train wheel including a load gear which has a load tooth whose rotation load is different from that of another tooth and in which the rotor has an odd number of rotation steps when the load gear rotates once, and transmitting a rotation force from the rotor to the hand; a voltage detection unit that detects an induced voltage generated at one end portion of a first end portion and a second end portion of the coil when the rotor vibrates; and a determination unit which, based on a result detected by the voltage detection unit, determines a mechanical load received by the rotor due to contact of the load tooth of the load gear with a tooth meshing with the load gear.
    Type: Application
    Filed: March 7, 2022
    Publication date: September 15, 2022
    Inventors: Kazuo Kato, Tomohiro Ihashi, Kazumi Sakumoto, Akihito Okumura
  • Patent number: 11424702
    Abstract: A motor driving apparatus including a driving circuit for supplying a first pulse with which a first coil included in a two-phase stepping motor generates a first magnetic flux, a second pulse with which a second coil included in the stepping motor generates a second magnetic flux opposite to the first magnetic flux, a third pulse with which the first coil generates the second magnetic flux, and a fourth pulse with which the second coil generates the first magnetic flux, to the stepping motor. The driving circuit supplies the second pulse, the third pulse, and the fourth pulse in this order to the stepping motor in a state of being stopped to start the stepping motor, and supplies the first pulse, the second pulse, the third pulse, and the fourth pulse in this order to the stepping motor after starting to continuously drive the stepping motor.
    Type: Grant
    Filed: February 26, 2020
    Date of Patent: August 23, 2022
    Assignee: SEIKO INSTRUMENTS INC.
    Inventors: Tetsuya Nobe, Satoshi Sakai, Kazumi Sakumoto, Kosuke Yamamoto, Akihito Okumura
  • Publication number: 20220181997
    Abstract: A stepping motor control device includes a driving unit that drives a stepping motor including a rotor that rotates a hand and a coil that generates a magnetic flux for rotating the rotor, a control unit that outputs, to the driving unit, a driving pulse for rotating the rotor and a swinging pulse for swinging the rotor, a voltage detecting unit that detects an induced voltage generated in the coil when the rotor vibrates, and a determining unit that determines, based on a result of the detection of the voltage detecting unit, a mechanical load received by the rotor.
    Type: Application
    Filed: December 3, 2021
    Publication date: June 9, 2022
    Inventors: Akihito OKUMURA, Kosuke YAMAMOTO, Tetsuya NOBE, Kazumi SAKUMOTO
  • Patent number: 10831158
    Abstract: A timepiece includes a motor control unit driving a motor for driving an indicating hand, based on an instruction signal, and a control unit receiving an instruction confirmation signal corresponding to a drive state of the motor in response to the instruction signal from the motor control unit, and determining whether or not the motor is driven in accordance with the instruction signal, based on the instruction confirmation signal.
    Type: Grant
    Filed: March 23, 2018
    Date of Patent: November 10, 2020
    Assignee: SEIKO INSTRUMENTS INC.
    Inventor: Kazumi Sakumoto
  • Publication number: 20200313583
    Abstract: A motor driving apparatus including a driving circuit for supplying a first pulse with which a first coil included in a two-phase stepping motor generates a first magnetic flux, a second pulse with which a second coil included in the stepping motor generates a second magnetic flux opposite to the first magnetic flux, a third pulse with which the first coil generates the second magnetic flux, and a fourth pulse with which the second coil generates the first magnetic flux, to the stepping motor. The driving circuit supplies the second pulse, the third pulse, and the fourth pulse in this order to the stepping motor in a state of being stopped to start the stepping motor, and supplies the first pulse, the second pulse, the third pulse, and the fourth pulse in this order to the stepping motor after starting to continuously drive the stepping motor.
    Type: Application
    Filed: February 26, 2020
    Publication date: October 1, 2020
    Inventors: Tetsuya NOBE, Satoshi SAKAI, Kazumi SAKUMOTO, Kosuke YAMAMOTO, Akihito OKUMURA
  • Patent number: 10228660
    Abstract: A proposed electronic apparatus is capable of charging a secondary battery and performing data communication using a solar cell while suppressing effects of ambient light even when the intensity of light radiated to the solar cell is low. The electronic apparatus includes a control circuit 202 and a resistance 205. The control circuit 202 receives data based on an output voltage of a solar cell 201. The resistance 205 is connected between electrodes of the solar cell 201. The control circuit 202 controls a resistance value of the resistance 205 based on whether during an operation of receiving data or not.
    Type: Grant
    Filed: November 18, 2014
    Date of Patent: March 12, 2019
    Assignee: SEIKO INSTRUMENTS INC.
    Inventors: Tamotsu Maesawa, Kazumi Sakumoto, Keisuke Tsubata, Tetsuya Nobe
  • Patent number: 10203664
    Abstract: An electronic timepiece includes a first switch connected to a signal line, a second switch, and a one-shot pulse signal generation circuit. The first switch is inserted into the signal line. One end of the second switch is connected to the signal line at a rear stage of the first switch, and the other end of the second switch is connected to a power source. The one-shot pulse signal generation circuit generates a one-shot pulse signal by using a reference clock signal, and the second switch is controlled by the one-shot pulse signal. The timepiece device can reduce currents flowing in a pull-down resistor or a pull-up resistor when a crown switch is turned on.
    Type: Grant
    Filed: August 23, 2016
    Date of Patent: February 12, 2019
    Assignee: SEIKO INSTRUMENTS INC.
    Inventors: Kazumi Sakumoto, Kotaro Watanabe, Minoru Sano
  • Patent number: 10180661
    Abstract: A frequency division circuit includes a first frequency division circuit which divides a frequency of a reference signal that is generated by an oscillation circuit. An input/output terminal outputs an output signal of the first frequency division circuit for testing. A selection circuit outputs as an intermediate signal one of a first intermediate signal which is input from the input/output output terminal, and a second intermediate signal which is an output signal of the first frequency division circuit. A second frequency division circuit divides a frequency of the intermediate signal output from the selection circuit. A switching time count circuit begins counting a predetermined amount of time after the second frequency division circuit starts frequency-dividing the intermediate signal and, after elapse of the predetermined amount of time, switches the intermediate signal output from the selection circuit from the first intermediate signal to the second intermediate signal.
    Type: Grant
    Filed: March 17, 2016
    Date of Patent: January 15, 2019
    Assignee: SEIKO INSTRUMENTS INC.
    Inventor: Kazumi Sakumoto
  • Publication number: 20180292790
    Abstract: A timepiece includes a motor control unit driving a motor for driving an indicating hand, based on an instruction signal, and a control unit receiving an instruction confirmation signal corresponding to a drive state of the motor in response to the instruction signal from the motor control unit, and determining whether or not the motor is driven in accordance with the instruction signal, based on the instruction confirmation signal.
    Type: Application
    Filed: March 23, 2018
    Publication date: October 11, 2018
    Inventor: Kazumi SAKUMOTO
  • Patent number: 10067480
    Abstract: An electronic device includes at least an acquisition unit, an input unit, a time correction amount calculation unit, and a transmitting unit. A timepiece includes at least a receiving unit, a power storage unit, a drive unit, and a control unit. The input unit receives an input of the time displayed by the display unit of the timepiece. The time correction amount calculation unit calculates a time correction amount for correcting the time of the timepiece from a difference between the time, the input of which is received by the input unit and the current time acquired by the acquisition unit. The transmitting unit transmits the time correction amount to the timepiece by using light. The receiving unit receives the time correction amount. The power storage unit stores electricity by using power converted from the light. The drive unit drives the indicating hand. The control unit corrects the time displayed by the indicating hand, based on the time correction amount received by the receiving unit.
    Type: Grant
    Filed: October 17, 2014
    Date of Patent: September 4, 2018
    Assignee: SEIKO INSTRUMENTS INC.
    Inventors: Kenji Ogasawara, Akira Takakura, Kazumi Sakumoto, Tamotsu Maesawa, Kazuhiro Koyama, Tomohiro Ihashi, Kosuke Yamamoto, Ayumi Matsumoto
  • Patent number: 9800333
    Abstract: An electronic device includes a display part having a light source which transmits an optical signal, a direction detection part for detecting a direction of orientation of a display screen of the display part, and a controller for transmitting data by the optical signal from the display part to an electronic timepiece when the direction of orientation of the display screen detected by the detection part faces a predetermined direction.
    Type: Grant
    Filed: September 15, 2015
    Date of Patent: October 24, 2017
    Assignee: SEIKO INSTRUMENTS INC.
    Inventors: Kenji Ogasawara, Akira Takakura, Kazumi Sakumoto, Tamotsu Maesawa, Kazuhiro Koyama, Tomohiro Ihashi, Kosuke Yamamoto, Ayumi Matsumoto
  • Publication number: 20170075310
    Abstract: A proposed electronic apparatus is capable of charging a secondary battery and performing data communication using a solar cell while suppressing effects of ambient light even when the intensity of light radiated to the solar cell is low. The electronic apparatus includes a control circuit 202 and a resistance 205. The control circuit 202 receives data based on an output voltage of a solar cell 201. The resistance 205 is connected between electrodes of the solar cell 201. The control circuit 202 controls a resistance value of the resistance 205 based on whether during an operation of receiving data or not.
    Type: Application
    Filed: November 18, 2014
    Publication date: March 16, 2017
    Inventors: Tamotsu MAESAWA, Kazumi SAKUMOTO, Keisuke TSUBATA, Tetsuya NOBE
  • Publication number: 20170060096
    Abstract: An electronic timepiece which can reduce currents flowing in a pull-down resistor or a pull-up resistor when a crown switch is turned on includes a first switch that is connected to a signal line, a second switch, and a one-shot pulse signal generation circuit. The first switch is inserted into the signal line. One end of the second switch is connected to the signal line on a rear stage of the first switch. The other end of the second switch is connected to a power source. The one-shot pulse signal generation circuit generates a one-shot pulse signal by using a reference clock signal. The second switch is controlled by the one-shot pulse signal.
    Type: Application
    Filed: August 23, 2016
    Publication date: March 2, 2017
    Inventors: Kazumi SAKUMOTO, Kotaro WATANABE, Minoru SANO
  • Publication number: 20160342139
    Abstract: A frequency division circuit includes a first frequency division circuit which divides a frequency of a reference signal that is generated by an oscillation circuit; an input and output terminal from which an output signal of the first frequency division circuit is output to the outside; a selection circuit which outputs one of a first intermediate signal that is one of a signal which is output to the input and output terminal and a signal which is input from the input and output terminal, and a second intermediate signal that is an output signal of the first frequency division circuit, as an intermediate signal; a second frequency division circuit which divides a frequency of the intermediate signal; and a switching time count circuit which counts a predetermined amount of time after startup of the frequency division circuit, and switches the intermediate signal that is output from the selection circuit from the first intermediate signal to the second intermediate signal, after the predetermined amount of ti
    Type: Application
    Filed: March 17, 2016
    Publication date: November 24, 2016
    Inventor: Kazumi SAKUMOTO
  • Publication number: 20160266554
    Abstract: An electronic device includes at least an acquisition unit, an input unit, a time correction amount calculation unit, and a transmitting unit. A timepiece includes at least a receiving unit, a power storage unit, a drive unit, and a control unit. The input unit receives an input of the time displayed by the display unit of the timepiece. The time correction amount calculation unit calculates a time correction amount for correcting the time of the timepiece from a difference between the time, the input of which is received by the input unit and the current time acquired by the acquisition unit. The transmitting unit transmits the time correction amount to the timepiece by using light. The receiving unit receives the time correction amount. The power storage unit stores electricity by using power converted from the light. The drive unit drives the indicating hand. The control unit corrects the time displayed by the indicating hand, based on the time correction amount received, by the receiving unit .
    Type: Application
    Filed: October 17, 2014
    Publication date: September 15, 2016
    Inventors: Kenji OGASAWARA, Akira TAKAKURA, Kazumi SAKUMOTO, Tamotsu MAESAWA, Kazuhiro KOYAMA, Tomohiro IHASHI, Kosuke YAMAMOTO, Ayumi MATSUMOTO
  • Patent number: 9442465
    Abstract: An electronic timepiece includes a solar power source, a voltage stabilizer circuit that generates a constant voltage by using power supplied from the solar power source, and a control circuit that clocks the time by driving a rotating body at first hand operation speed and at second hand operation speed which is faster than the first hand operation speed. The control circuit selects a voltage of the solar power source so as to drive the rotating body in a case of the first hand operation speed, and selects at least any one voltage of the constant voltage and the voltage of the solar power source so as to drive the rotating body in a case of the second hand operation speed.
    Type: Grant
    Filed: November 12, 2015
    Date of Patent: September 13, 2016
    Assignee: SEIKO INSTRUMENTS INC.
    Inventors: Kosuke Yamamoto, Kenji Ogasawara, Kazuhiro Koyama, Kazumi Sakumoto, Tamotsu Maesawa, Tomohiro Ihashi, Ayumi Matsumoto, Akira Takakura
  • Publication number: 20160139569
    Abstract: An electronic timepiece includes a solar power source, a voltage stabilizer circuit that generates a constant voltage by using power supplied from the solar power source, and a control circuit that clocks the time by driving a rotating body at first hand operation speed and at second hand operation speed which is faster than the first hand operation speed. The control circuit selects a voltage of the solar power source so as to drive the rotating body in a case of the first hand operation speed, and selects at least any one voltage of the constant voltage and the voltage of the solar power source so as to drive the rotating body in a case of the second hand operation speed.
    Type: Application
    Filed: November 12, 2015
    Publication date: May 19, 2016
    Inventors: Kosuke YAMAMOTO, Kenji OGASAWARA, Kazuhiro KOYAMA, Kazumi SAKUMOTO, Tamotsu MAESAWA, Tomohiro IHASHI, Ayumi MATSUMOTO, Akira TAKAKURA
  • Publication number: 20160080078
    Abstract: To perform stable communication in communication by an optical signal. An electronic device includes a display part having a light source which transmits an optical signal, a direction detection part detecting a direction of a display screen of the display part and a controller transmitting data by the optical signal from the display part to an electronic timepiece when the direction of the display screen detected by the detection part becomes a predetermined direction.
    Type: Application
    Filed: September 15, 2015
    Publication date: March 17, 2016
    Inventors: Kenji OGASAWARA, Akira TAKAKURA, Kazumi SAKUMOTO, Tamotsu MAESAWA, Kazuhiro KOYAMA, Tomohiro IHASHI, Kosuke YAMAMOTO, Ayumi MATSUMOTO
  • Publication number: 20160080076
    Abstract: To receive data normally in communication by an optical signal by an electronic device which transmits data even when a transmission frequency differs. An electronic device transmits a transmission-frequency measurement signal for measuring a transmission frequency of data and transmits the data by using a light source which transmits an optical signal. An electronic timepiece specifies the transmission frequency of data based on the transmission-frequency measurement signal received by a solar battery which receives the optical signal and receiving the data by the solar battery based on the specified transmission frequency.
    Type: Application
    Filed: September 15, 2015
    Publication date: March 17, 2016
    Inventors: Tomohiro IHASHI, Kenji OGASAWARA, Akira TAKAKURA, Kazumi SAKUMOTO, Tamotsu MAESAWA, Kazuhiro KOYAMA, Kosuke YAMAMOTO, Ayumi MATSUMOTO
  • Patent number: 9190941
    Abstract: A rotation detection circuit detects an induced current flowing through a drive coil of a stepping motor in a detection section divided into a plurality of sections, and detects a rotation state of the stepping motor on the basis of a pattern indicating whether or not the induced current exceeds a predetermined reference value in each of the sections. A control unit selects a drive pulse corresponding to the rotation state detected by the rotation detection unit, and supplies a drive current to a drive coil to rotatably drive the stepping motor. The rotation detection unit carries out detection by selecting a detection direction of the induced current in the sections after the first section on the basis of whether or not the induced current exceeding each of a plurality of reference values is detected plural times in the first section.
    Type: Grant
    Filed: August 29, 2013
    Date of Patent: November 17, 2015
    Assignee: SEIKO INSTRUMENTS INC.
    Inventors: Saburo Manaka, Kenji Ogasawara, Kazumi Sakumoto, Keishi Honmura, Kosuke Yamamoto, Satoshi Sakai