Patents by Inventor Takeo Seki
Takeo Seki 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: 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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Publication number: 20150077027Abstract: A load torque estimation apparatus inputs a controlling value for controlling the electric motor and an actually measured value of a rotational speed of the electric motor to a model to estimate load torque of the electric motor; and derives a mechanical time constant of the electric motor corresponding to the load torque estimated by the estimation part. The load torque estimation apparatus updates the mechanical time constant included in the model by using the mechanical time constant corresponding to the load torque estimated at an (n?1)th control period (where n denotes an integer greater than or equal to 2) and estimates the load torque of the electric motor at an nth control period by inputting the controlling value and the actually measured value acquired at the nth control period to the model acquired through the updating.Type: ApplicationFiled: September 9, 2014Publication date: March 19, 2015Applicant: RICOH COMPANY, LTD.Inventors: Takeo SEKI, Yoshihiro TAKAHASHI
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Publication number: 20150077028Abstract: A load torque estimation apparatus estimates load torque of an electric motor. The apparatus includes an estimation part configured to input a controlling value for controlling the electric motor and an actually measured value of a rotational speed of the electric motor to a model and estimating load torque of the electric motor; and a derivation part configured to derive a mechanical time constant of the electric motor corresponding to the actually measured value of the rotational speed of the electric motor. The estimation part is configured to update, according to a timing of acquiring the actually measured value of the rotational speed of the electric motor, the mechanical time constant included in the model by using the mechanical time constant corresponding to the acquired actually measured value and estimate the load torque of the electric motor by using the updated model.Type: ApplicationFiled: September 10, 2014Publication date: March 19, 2015Applicant: RICOH COMPANY, LTD.Inventors: Takeo SEKI, Yoshihiro TAKAHASHI
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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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Patent number: 8695975Abstract: A jam-processing assisting device that performs a jam removal process for removing a sheet jammed at a carriage roller by rotating the carriage roller includes: a motor that drives the carriage roller to rotate; a rotation-direction detecting unit that detects a direction of rotation in which the motor is required to rotate for removing a jam; and a motor-driving controlling unit that drives the motor to rotate in the direction that has been detected. The rotation-direction detecting unit determines, based on a detection of a pulling-out direction in which the jammed sheet is pulled by an external force, the pulling-out direction that has been detected as the direction of rotation of the motor and drives the motor in the direction that has been determined.Type: GrantFiled: February 21, 2012Date of Patent: April 15, 2014Assignee: Ricoh Company, LimitedInventor: Takeo Seki
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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
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Publication number: 20130193894Abstract: 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: January 31, 2013Publication date: August 1, 2013Inventors: Hiroyuki KIGUCHI, Takeo Seki, Natsuko Ishizuka, Takuya Murata
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Publication number: 20130078021Abstract: 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: September 12, 2012Publication date: March 28, 2013Applicant: RICOH COMPANY, LTD.Inventors: Shogo SAKAMOTO, Takuya MURATA, Takeo SEKI, Hiroyuki KIGUCHI
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Publication number: 20120217702Abstract: A jam-processing assisting device that performs a jam removal process for removing a sheet jammed at a carriage roller by rotating the carriage roller includes: a motor that drives the carriage roller to rotate; a rotation-direction detecting unit that detects a direction of rotation in which the motor is required to rotate for removing a jam; and a motor-driving controlling unit that drives the motor to rotate in the direction that has been detected. The rotation-direction detecting unit determines, based on a detection of a pulling-out direction in which the jammed sheet is pulled by an external force, the pulling-out direction that has been detected as the direction of rotation of the motor and drives the motor in the direction that has been determined.Type: ApplicationFiled: February 21, 2012Publication date: August 30, 2012Applicant: RICOH COMPANY, LIMITEDInventor: Takeo Seki
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Patent number: 7127702Abstract: There is provided an application development system capable of easily developing an application which is capable of flexibly coping with the variation in system environment, such as a platform, and which has excellent maintainability. In the application development system, a design tool 1 supports the designing of an application, which is based on the combination of a plurality of logical components, on the basis of a logical component information 4, to output a logical design information 5 obtained by the designing of the application. A source generating part 2 and a compiler 3 produce an application (an executable file 9), which is executable on a specific platform, on the basis of the logical design information 5, which is outputted from the design tool 1, and a physical installation information (a physical component information 6 and a component library 8) for software components.Type: GrantFiled: October 26, 2001Date of Patent: October 24, 2006Assignee: Kabushiki Kaisha ToshibaInventor: Takeo Seki
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Publication number: 20020053070Abstract: There is provided an application development system capable of easily developing an application which is capable of flexibly coping with the variation in system environment, such as a platform, and which has excellent maintainability. In the application development system, a design tool 1 supports the designing of an application, which is based on the combination of a plurality of logical components, on the basis of a logical component information 4, to output a logical design information 5 obtained by the designing of the application. A source generating part 2 and a compiler 3 produce an application (an executable file 9), which is executable on a specific platform, on the basis of the logical design information 5, which is outputted from the design tool 1, and a physical installation information (a physical component information 6 and a component library 8) for software components.Type: ApplicationFiled: October 26, 2001Publication date: May 2, 2002Applicant: KABUSHIKI KAISHA TOSHIBAInventor: Takeo Seki
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Patent number: 5382929Abstract: A monolithic crystal filter includes a crystal plate sealed airtight in a vessel. The vessel consists of a metal lid and a main body. The crystal plate is supported a predetermined distance from an insulating substrate. An input electrode and an output electrode are affixed to one surface of the crystal plate. A common electrode is affixed to the other surface of the crystal plate. The insulating substrate has a shield electrode thereon facing the input electrode and output electrode. The shield electrode is grounded to the metal lid of the vessel. An optimal distance between the shield electrode and the input electrode and the output electrode is disclosed for obtaining the best stopband attenuation level. An aluminum electrode island between the crystal plate and an electrode terminal develops an oxide coating which permits relaxation of stress and strain between the electrode island and its associated input and output electrodes to the resulting appropriate bonding strength therebetween.Type: GrantFiled: August 2, 1993Date of Patent: January 17, 1995Assignee: NDK, Nihon Dempa Kogyo Company, Ltd.Inventors: Kiyohisa Inao, Koji Mizuki, Masaki Kumagai, Takeo Seki
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Patent number: 4367504Abstract: A piezo-electric bimorph type transducer of a cantilever type for controlling the scan tracking of a magnetic tape by a rotating head in a helical-scan-type video tape recorder. In this transducer, piezo-electric thin plates which constitute a piezo-electric bimorph are formed in a different shape from the electrodes attached to the piezo-electric thin plates, and the width of the electrodes is smaller than the width of the piezo-electric thin plates in the direction from a fixed end of the transducer toward a movable end of the same, whereby in the bimorph element, a predetermined relationship is attained between the bending moment produced by a control voltage applied to the electrodes and the innertia generated in a dynamic condition, and the displacement of the magnetic head caused by the piezo-electric bimorph type transducer is in static and dynamic conformity, so that the tracking control is correctly carried out.Type: GrantFiled: April 2, 1981Date of Patent: January 4, 1983Assignees: Hitachi Denshi Kabushiki Kaisha, Hitachi, Ltd.Inventors: Takeo Seki, Yukio Shinoda, Akio Kumada
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Patent number: 3984189Abstract: A method and apparatus for detecting a flaw, color shading, or the like on the surface of a running object and for producing an electrical signal in response thereto by optically scanning such surface, characterized in that there is provided not only a photoelectric element for receiving the component of light regularly reflected from the surface of the running object, but also means for receiving the component of light irregularly reflected from the surface thereof, thereby to detect all of the defects that may exist on the surface of such object regardless of the surface finish.Type: GrantFiled: December 2, 1974Date of Patent: October 5, 1976Assignees: Hitachi Electronics, Ltd., Nisshin Steel Co.Inventors: Takeo Seki, Itsuji Maeda
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Patent number: 3946270Abstract: Signal collecting and distributing systems wherein an active transmission line possessing neuristor characteristics is provided as a means for scanning a plurality of signal transducers, which may be in the form of radiation sensitive elements or electroluminescent elements, respectively, to effect actuation thereof in a prescribed order.Type: GrantFiled: January 10, 1972Date of Patent: March 23, 1976Assignees: Semiconductor Research Foundation, Hitachi, Ltd.Inventors: Jun-ichi Nishizawa, Ichiemon Sasaki, Katsuhiko Ishida, Syoji Tauchi, Takeshi Nishimura, Takeo Seki, Noboru Kozuma