Patents by Inventor Haruka Miyaji
Haruka Miyaji 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: 11563393Abstract: A control device 10 for a rotary apparatus 1 includes a driving circuit 40 configured to apply a driving voltage to a stepping motor 20 that rotates an output gear 74, and a control circuit 30 configured to output, to the driving circuit 40, driving pulses in a number corresponding to a driving target included in a driving command signal from the outside. The control circuit 30 includes a driving-pulse output unit 61 configured to output the driving pulse in the number corresponding to the driving target, a position-information acquiring unit 52 configured to acquire position information from a potentiometer 75 that reads a rotating position of the output gear 74 of the rotary apparatus 1, and a rotation-abnormality determining unit 59 configured to determine, based on the position information acquired by the position-information acquiring unit 52, whether a rotation abnormality has occurred in the rotary apparatus 1.Type: GrantFiled: December 14, 2020Date of Patent: January 24, 2023Assignee: MINEBEA MITSUMI Inc.Inventors: Kazuo Takada, Takayuki Matsui, Haruka Miyaji, Hideo Sano
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Publication number: 20220321038Abstract: The application includes a rotating device 1 that includes a variable resistor, a voltage output line configured to output a voltage, and an adjustment resistor. A resistance value Rx of the adjustment resistor is set to a value between a minimum value RxMin determined in a manner for a ratio of an adjustment voltage Vx in a case of having the adjustment resistor to a reference voltage Vo in a case of not having the adjustment resistor to become greater than or equal to a predetermined value, and a maximum value RxMax determined in a manner for noise generated on the voltage output from the voltage output line with the contact position located within a dead zone of a position sensor 80 to become less than or equal to a predetermined value.Type: ApplicationFiled: March 28, 2022Publication date: October 6, 2022Inventors: Kazuo TAKADA, Haruka MIYAJI, Azusa IKEGAMI
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Publication number: 20220294313Abstract: To provide a motor inhibiting emission of electromagnetic noise (EMC) to the outside and a rotary apparatus including the motor. The rotary apparatus of the present disclosure includes: a housing; a motor arranged inside the housing; a circuit board arranged inside the housing and electrically connected to the motor; and a flexible wiring board electrically connecting the motor to the circuit board, the motor including a frame formed with a conductive member, the frame electrically connected via the flexible wiring board to a ground of the circuit board.Type: ApplicationFiled: May 31, 2022Publication date: September 15, 2022Inventors: Haruka MIYAJI, Kazuo TAKADA, Shigeki MIYAJI, Takayuki MATSUI
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Patent number: 11381139Abstract: To provide a motor inhibiting emission of electromagnetic noise (EMC) to the outside and a rotary apparatus including the motor. The rotary apparatus (10) of the present disclosure includes: a housing (20); a motor (40) arranged inside the housing (20); a circuit board (50) arranged inside the housing (20) and electrically connected to the motor (40); and a flexible wiring board (44) electrically connecting the motor (40) to the circuit board (50), the motor (40) including a frame (41a) formed with a conductive member, the frame (41a) electrically connected via the flexible wiring board (44) to a ground of the circuit board (50).Type: GrantFiled: February 22, 2019Date of Patent: July 5, 2022Assignee: MINEBEA MITSUMI INC.Inventors: Haruka Miyaji, Kazuo Takada, Shigeki Miyaji, Takayuki Matsui
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Patent number: 11139763Abstract: A motor drive control device has a controller and a driver. The controller generates a control signal for controlling driving of a two-phase stepping motor so as to alternately repeat one-phase excitation in which a coil of one phase in coils of two phases of the two-phase stepping motor is excited and two-phase excitation in which the coils of two phases in the coils of the two phases are excited. The driver drives the coils of the two phases, based on the control signal. The controller determines, based on a back electromotive force generated in the coil that was not excited during the one-phase excitation, a period of performing the one-phase excitation, and determines, based on the period of the one-phase excitation performed before the two-phase excitation, a period of performing the two-phase excitation.Type: GrantFiled: July 27, 2020Date of Patent: October 5, 2021Assignee: MINEBEA MITSUMI INC.Inventors: Haruka Miyaji, Kei Yamazaki, Takayuki Matsui, Kazuo Takada, Shigeki Miyaji, Ayaka Shimada
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Publication number: 20210194399Abstract: A control device 10 for a rotary apparatus 1 includes a driving circuit 40 configured to apply a driving voltage to a stepping motor 20 that rotates an output gear 74, and a control circuit 30 configured to output, to the driving circuit 40, driving pulses in a number corresponding to a driving target included in a driving command signal from the outside. The control circuit 30 includes a driving-pulse output unit 61 configured to output the driving pulse in the number corresponding to the driving target, a position-information acquiring unit 52 configured to acquire position information from a potentiometer 75 that reads a rotating position of the output gear 74 of the rotary apparatus 1, and a rotation-abnormality determining unit 59 configured to determine, based on the position information acquired by the position-information acquiring unit 52, whether a rotation abnormality has occurred in the rotary apparatus 1.Type: ApplicationFiled: December 14, 2020Publication date: June 24, 2021Inventors: Kazuo TAKADA, Takayuki MATSUI, Haruka MIYAJI, Hideo SANO
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Publication number: 20210044229Abstract: A motor drive control device has a controller and a driver. The controller generates a control signal for controlling driving of a two-phase stepping motor so as to alternately repeat one-phase excitation in which a coil of one phase in coils of two phases of the two-phase stepping motor is excited and two-phase excitation in which the coils of two phases in the coils of the two phases are excited. The driver drives the coils of the two phases, based on the control signal. The controller determines, based on a back electromotive force generated in the coil that was not excited during the one-phase excitation, a period of performing the one-phase excitation, and determines, based on the period of the one-phase excitation performed before the two-phase excitation, a period of performing the two-phase excitation.Type: ApplicationFiled: July 27, 2020Publication date: February 11, 2021Inventors: Haruka MIYAJI, Kei YAMAZAKI, Takayuki MATSUI, Kazuo TAKADA, Shigeki MIYAJI, Ayaka SHIMADA
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Patent number: 10530283Abstract: A motor controller capable of more reliably starting a stepping motor even if a predetermined drive power is supplied to the stepping motor, and to a control method for the stepping motor is provided. The motor controller driving a stepping motor detects that the stepping motor is in a step-out state after a start operation of the stepping motor is performed. If predetermined determination conditions are satisfied, when it is detected that the stepping motor is in a step-out state, it is determined that a restart operation of the stepping motor is performed, and the stepping motor is restarted.Type: GrantFiled: March 23, 2018Date of Patent: January 7, 2020Assignee: MINEBEA MITSUMI INC.Inventors: Ayaka Shimada, Takayuki Matsui, Kazuo Takada, Haruka Miyaji, Hideo Sano
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Publication number: 20190190352Abstract: To provide a motor inhibiting emission of electromagnetic noise (EMC) to the outside and a rotary apparatus including the motor. The rotary apparatus (10) of the present disclosure includes: a housing (20); a motor (40) arranged inside the housing (20); a circuit board (50) arranged inside the housing (20) and electrically connected to the motor (40); and a flexible wiring board (44) electrically connecting the motor (40) to the circuit board (50), the motor (40) including a frame (41a) formed with a conductive member, the frame (41a) electrically connected via the flexible wiring board (44) to a ground of the circuit board (50).Type: ApplicationFiled: February 22, 2019Publication date: June 20, 2019Inventors: Haruka MIYAJI, Kazuo Takada, Shigeki Miyaji, Takayuki Matsui
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Publication number: 20180287532Abstract: A motor controller capable of more reliably starting a stepping motor even if a predetermined drive power is supplied to the stepping motor, and to a control method for the stepping motor is provided. The motor controller driving a stepping motor detects that the stepping motor is in a step-out state after a start operation of the stepping motor is performed. If predetermined determination conditions are satisfied, when it is detected that the stepping motor is in a step-out state, it is determined that a restart operation of the stepping motor is performed, and the stepping motor is restarted.Type: ApplicationFiled: March 23, 2018Publication date: October 4, 2018Inventors: Ayaka SHIMADA, Takayuki MATSUI, Kazuo TAKADA, Haruka MIYAJI, Hideo SANO
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Patent number: 9595855Abstract: An actuator includes a stepping motor; a multi-stage gear device including a first stage gear attached to a rotation shaft of the motor, wherein a gear of each stage engages with a gear of a next stage; and a base member on which the multi-stage gear device and the stepping motor are mounted, wherein in the multi-stage gear device, a grease composition for resin is applied to a bearing part of the gear, and to an engaging part between the gears, and the grease composition for resin includes: (a) a base oil including a poly-alpha-olefin oil with a kinematic viscosity at 100° C. of 4 to 6 mm2/s; (b) a thickening agent which is lithium soap; (c) a viscosity increasing agent; (d) a solid lubricant; and (e) an anti-wear agent, and wherein the NLGI consistency number of the composition is 00, 0, 1, or 2.Type: GrantFiled: February 28, 2014Date of Patent: March 14, 2017Assignee: MINEBEA CO., LTD.Inventors: Yusuke Asai, Motoharu Akiyama, Haruka Miyaji
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Patent number: 9257928Abstract: There is provided a control device for a stepping motor, configured to apply an excitation current to multiple coils to rotate a rotor. The control device includes a drive unit configured to apply a drive voltage to the coils, and a control unit configured to control the drive voltage applied by the drive unit, wherein the control unit includes a stop control unit configured to perform, during a hold period of a stop period of the stepping motor, a stop control which gradually decreases a magnitude of the excitation current flowing in the coils such that the rotor moves to a predetermined stop position, and wherein the stop control unit is configured to perform the stop control such that a variation amount of the excitation current per unit time becomes a predetermined threshold value for the stop period or less.Type: GrantFiled: June 11, 2014Date of Patent: February 9, 2016Assignee: Minebea Co., Ltd.Inventors: Kazuo Takada, Takayuki Matsui, Haruka Miyaji
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Patent number: 9119300Abstract: A motor control device includes a circuit board having a control circuit controlling electric power to be supplied to a motor, a base fixedly supporting the circuit board, a flexible printed circuit supplying electric power to the motor, a pin terminal disposed on the circuit board, being electrically connected with the control circuit, a dummy pin terminal disposed on the circuit board, being electrically free from the control circuit, a wiring pattern land disposed on the FPC, being electrically connected with the pin terminal, and a dummy wiring pattern land disposed on the FPC, being connected with the dummy pin terminal.Type: GrantFiled: December 18, 2012Date of Patent: August 25, 2015Assignee: MINEBEA CO., LTD.Inventors: Hidetoshi Hijikata, Takayuki Matsui, Kazuo Takada, Haruka Miyaji
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Patent number: 9035506Abstract: A motor includes a rotor, a stator, an excitation coil, and a holder disposed on an outer side of the stator to hold a flexible printed circuit board supplying drive power, wherein the holder includes a main body mounting the flexible printed circuit board thereon, a bridging portion disposed along one of long sides on a first face a of the main body to form a first opening allowing the flexible printed circuit board to be inserted therethrough, and an engaging portion disposed along each of short sides on a second face of the main body to removably fit with a part of a terminal block of the excitation coil.Type: GrantFiled: December 18, 2012Date of Patent: May 19, 2015Assignee: MINEBEA CO., LTD.Inventors: Haruka Miyaji, Takayuki Matsui, Tomoyuki Suzuki
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Publication number: 20150042258Abstract: There is provided a control device for a stepping motor, configured to apply an excitation current to multiple coils to rotate a rotor. The control device includes a drive unit configured to apply a drive voltage to the coils, and a control unit configured to control the drive voltage applied by the drive unit, wherein the control unit includes a stop control unit configured to perform, during a hold period of a stop period of the stepping motor, a stop control which gradually decreases a magnitude of the excitation current flowing in the coils such that the rotor moves to a predetermined stop position, and wherein the stop control unit is configured to perform the stop control such that a variation amount of the excitation current per unit time becomes a predetermined threshold value for the stop period or less.Type: ApplicationFiled: June 11, 2014Publication date: February 12, 2015Inventors: Kazuo TAKADA, Takayuki MATSUI, Haruka MIYAJI
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Publication number: 20140239760Abstract: An actuator includes a stepping motor; a multi-stage gear device including a first stage gear attached to a rotation shaft of the motor, wherein a gear of each stage engages with a gear of a next stage; and a base member on which the multi-stage gear device and the stepping motor are mounted, wherein in the multi-stage gear device, a grease composition for resin is applied to a bearing part of the gear, and to an engaging part between the gears, and the grease composition for resin includes: (a) a base oil including a poly-alpha-olefin oil with a kinematic viscosity at 100° C. of 4 to 6 mm2/s; (b) a thickening agent which is lithium soap; (c) a viscosity increasing agent; (d) a solid lubricant; and (e) an anti-wear agent, and wherein the NLGI consistency number of the composition is 00, 0, 1, or 2.Type: ApplicationFiled: February 28, 2014Publication date: August 28, 2014Inventors: Yusuke ASAI, Motoharu AKIYAMA, Haruka MIYAJI
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Patent number: 8643237Abstract: There is provided an actuator including a motor and a case adapted to house the motor. In the actuator, an output shaft of the motor is supported by a structured configured such that an elastic member is disposed between the case and at least one end of the output shaft, wherein the elastic member is in contact with a portion of the case in an engaging manner whereby the elastic member is prevented from shifting relative to the case in the rotation direction of the output shaft, and also wherein the elastic member is in contact with a portion of the motor in an engaging manner whereby a body of the motor is prevented from shifting relative to the elastic member in the rotation direction of the output shaft.Type: GrantFiled: June 21, 2011Date of Patent: February 4, 2014Assignee: Minebea Co., Ltd.Inventors: Haruka Miyaji, Tomoyuki Suzuki, Masaki Kagawa, Takayuki Matsui
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Patent number: 8174223Abstract: In a method of detecting synchronization loss in a stepping motor, a means for applying either control current or control voltage to a coil of each phase to thereby drive a stepping motor and a means for individually measuring a back EMF voltage induced at the coil of each phase are employed, wherein application of either the control current or the control voltage at the coil of each phase is halted by turns phase by phase for such a short time period as not to affect rotation of a rotor of the stepping motor at a predetermined timing within one step period of the rotor, the back EMF voltage at the coil is measured during the short time period, and the stepping motor is judged to lose synchronization when the measurement result of the back EMF voltage at the coil of at least one phase satisfies a detection criterion.Type: GrantFiled: March 25, 2009Date of Patent: May 8, 2012Assignee: Minebea Co., Ltd.Inventors: Kazuo Takada, Takayuki Matsui, Haruka Miyaji
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Publication number: 20110316374Abstract: There is provided an actuator including a motor and a case adapted to house the motor. In the actuator, an output shaft of the motor is supported by a structured configured such that an elastic member is disposed between the case and at least one end of the output shaft, wherein the elastic member is in contact with a portion of the case in an engaging manner whereby the elastic member is prevented from shifting relative to the case in the rotation direction of the output shaft, and also wherein the elastic member is in contact with a portion of the motor in an engaging manner whereby a body of the motor is prevented from shifting relative to the elastic member in the rotation direction of the output shaft.Type: ApplicationFiled: June 21, 2011Publication date: December 29, 2011Applicant: MINEBEA CO., LTD.Inventors: Haruka MIYAJI, Tomoyuki SUZUKI, Masaki KAGAWA, Takayuki MATSUI
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Publication number: 20090256515Abstract: In a method of detecting synchronization loss in a stepping motor, a means for applying either control current or control voltage to a coil of each phase to thereby drive a stepping motor and a means for individually measuring a back EMF voltage induced at the coil of each phase are employed, wherein application of either the control current or the control voltage at the coil of each phase is halted by turns phase by phase for such a short time period as not to affect rotation of a rotor of the stepping motor at a predetermined timing within one step period of the rotor, the back EMF voltage at the coil is measured during the short time period, and the stepping motor is judged to lose synchronization when the measurement result of the back EMF voltage at the coil of at least one phase satisfies a detection criterion.Type: ApplicationFiled: March 25, 2009Publication date: October 15, 2009Applicant: MINEBEA CO., LTD.Inventors: Kazuo Takada, Takayuki Matsui, Haruka Miyaji