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).
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Patent number: 11203201Abstract: An image recording apparatus includes a recording head including a plurality of nozzles from which ink is ejected, a memory, and one or more hardware processors coupled to the recording head and the memory. The one or more hardware processors are configured to: determine, for each of the plurality of nozzles, whether a position of the corresponding nozzle is a position to eject ink; determine whether a successive ejection operation is necessary for a nozzle out of the plurality of nozzles, whose position is determined as the position to eject ink; and cause ink to be successively ejected at the position to eject ink at a predetermined successive ejection frequency from the nozzle that is determined to have the necessity of the successive ejection operation.Type: GrantFiled: January 31, 2020Date of Patent: December 21, 2021Assignee: RICOH COMPANY, LTD.Inventors: Jun Shiori, Takuya Murata, Takahisa Koike, Hiroyuki Kiguchi, Ko Tokumaru, Yuji Tanaka
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Publication number: 20200247113Abstract: An image recording apparatus includes a recording head including a plurality of nozzles from which ink is ejected, a memory, and one or more hardware processors coupled to the recording head and the memory. The one or more hardware processors are configured to: determine, for each of the plurality of nozzles, whether a position of the corresponding nozzle is a position to eject ink; determine whether a successive ejection operation is necessary for a nozzle out of the plurality of nozzles, whose position is determined as the position to eject ink; and cause ink to be successively ejected at the position to eject ink at a predetermined successive ejection frequency from the nozzle that is determined to have the necessity of the successive ejection operation.Type: ApplicationFiled: January 31, 2020Publication date: August 6, 2020Inventors: Jun SHIORI, Takuya MURATA, Takahisa KOIKE, Hiroyuki KIGUCHI, Ko TOKUMARU, Yuji TANAKA
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Patent number: 10472194Abstract: 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: GrantFiled: January 3, 2017Date of Patent: November 12, 2019Assignee: RICOH COMPANY, LTD.Inventors: Takeo Seki, Haruyuki Suzuki, Takuya Murata, Hiroyuki Kiguchi
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Patent number: 10224859Abstract: 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: GrantFiled: March 19, 2018Date of Patent: March 5, 2019Assignee: RICOH COMPANY, LTD.Inventors: Hiroyuki Kiguchi, Takeo Seki, Natsuko Ishizuka, Takuya Murata
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Publication number: 20180212548Abstract: 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: ApplicationFiled: March 19, 2018Publication date: July 26, 2018Inventors: Hiroyuki Kiguchi, Takeo Seki, Natsuko Ishizuka, Takuya Murata
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Patent number: 9973133Abstract: 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: GrantFiled: September 21, 2016Date of Patent: May 15, 2018Assignee: RICOH COMPANY, LTD.Inventors: Hiroyuki Kiguchi, Takeo Seki, Natsuko Ishizuka, Takuya Murata
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Publication number: 20170190530Abstract: 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: ApplicationFiled: January 3, 2017Publication date: July 6, 2017Applicant: Ricoh Company, Ltd.Inventors: Takeo SEKI, Haruyuki SUZUKI, Takuya MURATA, Hiroyuki KIGUCHI
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Publication number: 20170012568Abstract: 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: ApplicationFiled: September 21, 2016Publication date: January 12, 2017Inventors: Hiroyuki KIGUCHI, Takeo SEKI, Natsuko ISHIZUKA, Takuya MURATA
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Patent number: 9515590Abstract: 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: GrantFiled: January 19, 2015Date of Patent: December 6, 2016Assignee: Ricoh Company, LimitedInventors: Natsuko Ishizuka, Hiroyuki Kiguchi, Takeo Seki, Takuya Murata
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Patent number: 9484845Abstract: 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: GrantFiled: January 31, 2013Date of Patent: November 1, 2016Assignee: RICOH COMPANY, LTD.Inventors: Hiroyuki Kiguchi, Takeo Seki, Natsuko Ishizuka, Takuya Murata
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Patent number: 9323208Abstract: 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: GrantFiled: December 31, 2014Date of Patent: April 26, 2016Assignee: Ricoh Company, Ltd.Inventors: Shogo Sakamoto, Takuya Murata, Takeo Seki, Hiroyuki Kiguchi
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Patent number: 9106164Abstract: 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: GrantFiled: January 25, 2013Date of Patent: August 11, 2015Assignee: Ricoh Company, Ltd.Inventors: Takeo Seki, Hiroyuki Kiguchi, Natsuko Ishizuka, Takuya Murata
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Patent number: 9093935Abstract: 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: GrantFiled: August 13, 2013Date of Patent: July 28, 2015Assignee: RICOH COMPANY, LIMITEDInventors: Natsuko Ishizuka, Takuya Murata, Hiroyuki Kiguchi, Takeo Seki
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Publication number: 20150130385Abstract: 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: ApplicationFiled: January 19, 2015Publication date: May 14, 2015Applicant: RICOH COMPANY, LIMITEDInventors: Natsuko ISHIZUKA, Hiroyuki KIGUCHI, Takeo SEKI, Takuya MURATA
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Patent number: 9018884Abstract: 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: GrantFiled: January 28, 2013Date of Patent: April 28, 2015Assignee: Ricoh Company, LimitedInventors: Natsuko Ishizuka, Hiroyuki Kiguchi, Takeo Seki, Takuya Murata
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Publication number: 20150110525Abstract: 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: ApplicationFiled: December 31, 2014Publication date: April 23, 2015Applicant: RICOH COMPANY, LTD.Inventors: Shogo SAKAMOTO, Takuya MURATA, Takeo SEKI, Hiroyuki KIGUCHI
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Patent number: 8928270Abstract: 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: GrantFiled: September 12, 2012Date of Patent: January 6, 2015Assignee: Ricoh Company, Ltd.Inventors: Shogo Sakamoto, Takuya Murata, Takeo Seki, Hiroyuki Kiguchi
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Publication number: 20140049199Abstract: 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: ApplicationFiled: August 13, 2013Publication date: February 20, 2014Inventors: Natsuko ISHIZUKA, Takuya Murata, Hiroyuki Kiguchi, Takeo Seki
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Publication number: 20130200838Abstract: 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: ApplicationFiled: January 25, 2013Publication date: August 8, 2013Inventors: Takeo SEKI, Hiroyuki KIGUCHI, Natsuko ISHIZUKA, Takuya MURATA
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Publication number: 20130200836Abstract: 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: ApplicationFiled: January 28, 2013Publication date: August 8, 2013Inventors: Natsuko ISHIZUKA, Hiroyuki KIGUCHI, Takeo SEKI, Takuya MURATA