Patents by Inventor Hiroyuki Kiguchi

Hiroyuki Kiguchi 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: 10224859
    Abstract: A motor control device includes a detecting unit configured to detect rotation of a motor to be controlled and output a rotation detection value related to the rotation; a drive control unit configured to perform drive control to rotate the motor at a control target value increasing with time based on the rotation detection value; and an abnormality detection unit configured to perform an abnormality detection process for detecting an abnormality in the drive control based on the rotation detection value and a predetermined threshold. The drive control unit performs control to stop rotation of the motor when the abnormality is detected.
    Type: Grant
    Filed: March 19, 2018
    Date of Patent: March 5, 2019
    Assignee: RICOH COMPANY, LTD.
    Inventors: Hiroyuki Kiguchi, Takeo Seki, Natsuko Ishizuka, Takuya Murata
  • Publication number: 20180212548
    Abstract: A motor control device includes a detecting unit configured to detect rotation of a motor to be controlled and output a rotation detection value related to the rotation; a drive control unit configured to perform drive control to rotate the motor at a control target value increasing with time based on the rotation detection value; and an abnormality detection unit configured to perform an abnormality detection process for detecting an abnormality in the drive control based on the rotation detection value and a predetermined threshold. The drive control unit performs control to stop rotation of the motor when the abnormality is detected.
    Type: Application
    Filed: March 19, 2018
    Publication date: July 26, 2018
    Inventors: Hiroyuki Kiguchi, Takeo Seki, Natsuko Ishizuka, Takuya Murata
  • Patent number: 9973133
    Abstract: A motor control device includes a detecting unit configured to detect rotation of a motor to be controlled and output a rotation detection value related to the rotation; a drive control unit configured to perform drive control to rotate the motor at a control target value increasing with time based on the rotation detection value; and an abnormality detection unit configured to perform an abnormality detection process for detecting an abnormality in the drive control based on the rotation detection value and a predetermined threshold. The drive control unit performs control to stop rotation of the motor when the abnormality is detected.
    Type: Grant
    Filed: September 21, 2016
    Date of Patent: May 15, 2018
    Assignee: RICOH COMPANY, LTD.
    Inventors: Hiroyuki Kiguchi, Takeo Seki, Natsuko Ishizuka, Takuya Murata
  • Publication number: 20170190530
    Abstract: A current detecting device includes: a drive signal generating unit configured to generate a control signal based on a control voltage value indicating drive force to be applied to a target; a current detecting unit configured to detect a current value output based on the control signal generated by the drive signal generating unit; and a correction unit configured to correct the current value detected by the current detecting unit, based on at least a magnitude of the control voltage value.
    Type: Application
    Filed: January 3, 2017
    Publication date: July 6, 2017
    Applicant: Ricoh Company, Ltd.
    Inventors: Takeo SEKI, Haruyuki SUZUKI, Takuya MURATA, Hiroyuki KIGUCHI
  • Publication number: 20170012568
    Abstract: A motor control device includes a detecting unit configured to detect rotation of a motor to be controlled and output a rotation detection value related to the rotation; a drive control unit configured to perform drive control to rotate the motor at a control target value increasing with time based on the rotation detection value; and an abnormality detection unit configured to perform an abnormality detection process for detecting an abnormality in the drive control based on the rotation detection value and a predetermined threshold. The drive control unit performs control to stop rotation of the motor when the abnormality is detected.
    Type: Application
    Filed: September 21, 2016
    Publication date: January 12, 2017
    Inventors: Hiroyuki KIGUCHI, Takeo SEKI, Natsuko ISHIZUKA, Takuya MURATA
  • Patent number: 9515590
    Abstract: A motor control device includes a controller configured to output a control signal to a motor driver, the control signal instructing the motor driver to cut off energization of a motor when the control signal and a signal changing depending on driving the motor do not change for a first time period, determine whether the motor is in a position hold state in which control for holding the motor at a position is executed, and change the control signal in a second time period shorter than the first time period when the motor is in the position hold state.
    Type: Grant
    Filed: January 19, 2015
    Date of Patent: December 6, 2016
    Assignee: Ricoh Company, Limited
    Inventors: Natsuko Ishizuka, Hiroyuki Kiguchi, Takeo Seki, Takuya Murata
  • Patent number: 9484845
    Abstract: A motor control device includes a detecting unit configured to detect rotation of a motor to be controlled and output a rotation detection value related to the rotation; a drive control unit configured to perform drive control to rotate the motor at a control target value increasing with time based on the rotation detection value; and an abnormality detection unit configured to perform an abnormality detection process for detecting an abnormality in the drive control based on the rotation detection value and a predetermined threshold. The drive control unit performs control to stop rotation of the motor when the abnormality is detected.
    Type: Grant
    Filed: January 31, 2013
    Date of Patent: November 1, 2016
    Assignee: RICOH COMPANY, LTD.
    Inventors: Hiroyuki Kiguchi, Takeo Seki, Natsuko Ishizuka, Takuya Murata
  • Patent number: 9323208
    Abstract: An electric motor system includes a brushless direct-current motor, a driver circuit, a position sensor, and a control circuit. The motor has an output shaft for transmitting torque. The driver circuit supplies power to the motor according to a control signal input thereto. The position sensor measures an angular, rotational position of the motor shaft. The control circuit controls operation of the motor. The control circuit includes a position sensor terminal, a reference terminal, a differential calculator, a controller, and a gain adjuster. The position sensor terminal receives a feedback signal. The reference terminal receives a reference signal. The differential calculator generates an error signal representing a difference between the measured and targeted rotational positions. The controller generates the control signal based on the error signal through a combination of control actions. The gain adjuster is connected to the controller to adjust a gain of each control action.
    Type: Grant
    Filed: December 31, 2014
    Date of Patent: April 26, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Shogo Sakamoto, Takuya Murata, Takeo Seki, Hiroyuki Kiguchi
  • Patent number: 9106164
    Abstract: A motor control device to execute speed control and position control of motor simultaneously, includes a target position information provider, a target speed information provider, a detected position information detector, a processor to add position feedback information, position feed-forward information, speed feedback information, and speed feed-forward information for output as motor control information, based on the target position information, the setting target speed information, and the detected position speed information, a control voltage generator operatively connected to the processor to generate a control voltage to drive the motor in accordance with the motor control information, and a motor driver operatively connected to the control voltage generator and the motor to control rotation of the motor based on the control voltage.
    Type: Grant
    Filed: January 25, 2013
    Date of Patent: August 11, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Takeo Seki, Hiroyuki Kiguchi, Natsuko Ishizuka, Takuya Murata
  • Patent number: 9093935
    Abstract: A motor control device supplies a drive control signal to a drive circuit that drives a motor at a constant period using a motor drive signal based on the drive control signal, and shuts off the motor drive signal when a count value counted by a counter that reset the count value if a state of the motor changes exceeds a threshold corresponding to a plurality of driving periods of the motor. The motor control device includes: a control unit that controls a setting unit to set a rotational direction of the motor to a first rotational direction and a second rotational direction reverse to the first rotational direction at the constant period alternately, when a drive mode of the motor is a position holding mode to drive the motor so as to hold a rotational position of the motor.
    Type: Grant
    Filed: August 13, 2013
    Date of Patent: July 28, 2015
    Assignee: RICOH COMPANY, LIMITED
    Inventors: Natsuko Ishizuka, Takuya Murata, Hiroyuki Kiguchi, Takeo Seki
  • Publication number: 20150130385
    Abstract: A motor control device includes a motor lock state determining unit configured to determine whether a motor is in a rotation lock state; a position hold state determining unit configured to determine whether the motor is in a position hold state; a lock detection invalidation determining unit configured to invalidate the determination of the lock state when the motor is in the position hold state and when a predetermined condition is satisfied; a position error correction unit configured to correct an error of a target stop position of the motor when the determination of the lock state is invalidated; and a motor control unit configured to change a rotation direction of the motor in a time shorter than a time in which the motor lock state determining unit determines the lock state when the motor is in the position hold state after the error is corrected.
    Type: Application
    Filed: January 19, 2015
    Publication date: May 14, 2015
    Applicant: RICOH COMPANY, LIMITED
    Inventors: Natsuko ISHIZUKA, Hiroyuki KIGUCHI, Takeo SEKI, Takuya MURATA
  • Patent number: 9018884
    Abstract: A motor control device includes a motor lock state determining unit configured to determine whether a motor is in a rotation lock state; a position hold state determining unit configured to determine whether the motor is in a position hold state; a lock detection invalidation determining unit configured to invalidate the determination of the lock state when the motor is in the position hold state and when a predetermined condition is satisfied; a position error correction unit configured to correct an error of a target stop position of the motor when the determination of the lock state is invalidated; and a motor control unit configured to change a rotation direction of the motor in a time shorter than a time in which the motor lock state determining unit determines the lock state when the motor is in the position hold state after the error is corrected.
    Type: Grant
    Filed: January 28, 2013
    Date of Patent: April 28, 2015
    Assignee: Ricoh Company, Limited
    Inventors: Natsuko Ishizuka, Hiroyuki Kiguchi, Takeo Seki, Takuya Murata
  • Publication number: 20150110525
    Abstract: An electric motor system includes a brushless direct-current motor, a driver circuit, a position sensor, and a control circuit. The motor has an output shaft for transmitting torque. The driver circuit supplies power to the motor according to a control signal input thereto. The position sensor measures an angular, rotational position of the motor shaft. The control circuit controls operation of the motor. The control circuit includes a position sensor terminal, a reference terminal, a differential calculator, a controller, and a gain adjuster. The position sensor terminal receives a feedback signal. The reference terminal receives a reference signal. The differential calculator generates an error signal representing a difference between the measured and targeted rotational positions. The controller generates the control signal based on the error signal through a combination of control actions. The gain adjuster is connected to the controller to adjust a gain of each control action.
    Type: Application
    Filed: December 31, 2014
    Publication date: April 23, 2015
    Applicant: RICOH COMPANY, LTD.
    Inventors: Shogo SAKAMOTO, Takuya MURATA, Takeo SEKI, Hiroyuki KIGUCHI
  • Patent number: 8928270
    Abstract: An electric motor system includes a brushless direct-current motor, a driver circuit, a position sensor, and a control circuit. The motor has an output shaft for transmitting torque. The driver circuit supplies power to the motor according to a control signal input thereto. The position sensor measures an angular, rotational position of the motor shaft. The control circuit controls operation of the motor. The control circuit includes a position sensor terminal, a reference terminal, a differential calculator, a controller, and a gain adjuster. The position sensor terminal receives a feedback signal. The reference terminal receives a reference signal. The differential calculator generates an error signal representing a difference between the measured and targeted rotational positions. The controller generates the control signal based on the error signal through a combination of control actions. The gain adjuster is connected to the controller to adjust a gain of each control action.
    Type: Grant
    Filed: September 12, 2012
    Date of Patent: January 6, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Shogo Sakamoto, Takuya Murata, Takeo Seki, Hiroyuki Kiguchi
  • Publication number: 20140049199
    Abstract: A motor control device supplies a drive control signal to a drive circuit that drives a motor at a constant period using a motor drive signal based on the drive control signal, and shuts off the motor drive signal when a count value counted by a counter that reset the count value if a state of the motor changes exceeds a threshold corresponding to a plurality of driving periods of the motor. The motor control device includes: a control unit that controls a setting unit to set a rotational direction of the motor to a first rotational direction and a second rotational direction reverse to the first rotational direction at the constant period alternately, when a drive mode of the motor is a position holding mode to drive the motor so as to hold a rotational position of the motor.
    Type: Application
    Filed: August 13, 2013
    Publication date: February 20, 2014
    Inventors: Natsuko ISHIZUKA, Takuya Murata, Hiroyuki Kiguchi, Takeo Seki
  • Publication number: 20130200838
    Abstract: A motor control device to execute speed control and position control of motor simultaneously, includes a target position information provider, a target speed information provider, a detected position information detector, a processor to add position feedback information, position feed-forward information, speed feedback information, and speed feed-forward information for output as motor control information, based on the target position information, the setting target speed information, and the detected position speed information, a control voltage generator operatively connected to the processor to generate a control voltage to drive the motor in accordance with the motor control information, and a motor driver operatively connected to the control voltage generator and the motor to control rotation of the motor based on the control voltage.
    Type: Application
    Filed: January 25, 2013
    Publication date: August 8, 2013
    Inventors: Takeo SEKI, Hiroyuki KIGUCHI, Natsuko ISHIZUKA, Takuya MURATA
  • Publication number: 20130200836
    Abstract: A motor control device includes a motor lock state determining unit configured to determine whether a motor is in a rotation lock state; a position hold state determining unit configured to determine whether the motor is in a position hold state; a lock detection invalidation determining unit configured to invalidate the determination of the lock state when the motor is in the position hold state and when a predetermined condition is satisfied; a position error correction unit configured to correct an error of a target stop position of the motor when the determination of the lock state is invalidated; and a motor control unit configured to change a rotation direction of the motor in a time shorter than a time in which the motor lock state determining unit determines the lock state when the motor is in the position hold state after the error is corrected.
    Type: Application
    Filed: January 28, 2013
    Publication date: August 8, 2013
    Inventors: Natsuko ISHIZUKA, Hiroyuki KIGUCHI, Takeo SEKI, Takuya MURATA
  • Publication number: 20130193894
    Abstract: A motor control device includes a detecting unit configured to detect rotation of a motor to be controlled and output a rotation detection value related to the rotation; a drive control unit configured to perform drive control to rotate the motor at a control target value increasing with time based on the rotation detection value; and an abnormality detection unit configured to perform an abnormality detection process for detecting an abnormality in the drive control based on the rotation detection value and a predetermined threshold. The drive control unit performs control to stop rotation of the motor when the abnormality is detected.
    Type: Application
    Filed: January 31, 2013
    Publication date: August 1, 2013
    Inventors: Hiroyuki KIGUCHI, Takeo Seki, Natsuko Ishizuka, Takuya Murata
  • Publication number: 20130078021
    Abstract: An electric motor system includes a brushless direct-current motor, a driver circuit, a position sensor, and a control circuit. The motor has an output shaft for transmitting torque. The driver circuit supplies power to the motor according to a control signal input thereto. The position sensor measures an angular, rotational position of the motor shaft. The control circuit controls operation of the motor. The control circuit includes a position sensor terminal, a reference terminal, a differential calculator, a controller, and a gain adjuster. The position sensor terminal receives a feedback signal. The reference terminal receives a reference signal. The differential calculator generates an error signal representing a difference between the measured and targeted rotational positions. The controller generates the control signal based on the error signal through a combination of control actions. The gain adjuster is connected to the controller to adjust a gain of each control action.
    Type: Application
    Filed: September 12, 2012
    Publication date: March 28, 2013
    Applicant: RICOH COMPANY, LTD.
    Inventors: Shogo SAKAMOTO, Takuya MURATA, Takeo SEKI, Hiroyuki KIGUCHI
  • Patent number: 5088078
    Abstract: An optical pickup apparatus in which a laser beam reflected from an optical memory medium is separated and incident to a light-receiving element having a plurality of divided light-receiving faces and a focusing error signal is formed on the basis of a difference signal provided by a predetermined combination of light-receiving signals outputted from the respective light-receiving faces of the light-receiving element, comprises a bias signal forming device for forming a bias signal in accordance with a reflectance ratio of the optical memory medium based on a sum of the light-receiving signals outputted from the respective light-receiving faces of the light-receiving element; and a device for superimposing the bias signal on the focusing error signal in an accessing stand-by state with respect to the optical memory medium.
    Type: Grant
    Filed: May 11, 1989
    Date of Patent: February 11, 1992
    Assignee: Ricoh Company, Ltd.
    Inventors: Isamu Moriwaki, Hiroyuki Kiguchi