Patents by Inventor Harumitsu Fujimori

Harumitsu Fujimori 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: 11856168
    Abstract: A sheet conveyance apparatus includes: a speed detection roller that detects a conveyance speed of a sheet by coming into contact with the sheet being conveyed and being driven to rotate; and a hardware processor that performs temperature control to make an ambient temperature of the speed detection roller a predetermined temperature.
    Type: Grant
    Filed: April 29, 2022
    Date of Patent: December 26, 2023
    Assignee: Konica Minolta, Inc.
    Inventors: Harumitsu Fujimori, Shota Igo, Naoto Sugaya, Kenji Tamaki
  • Patent number: 11838469
    Abstract: An image forming system includes: an image forming device that is disposed at a first conveyance path and forms an image on a recording medium that is a continuous sheet or a long sheet; a first conveyor that conveys the recording medium on the first conveyance path in a conveyance direction; an image reader that reads the image formed on the recording medium at a second conveyance path on a downstream side of the first conveyance path in the conveyance direction; a second conveyor that conveys the recording medium on the second conveyance path; and a controller that controls a speed of a drive source of the first conveyor and controls a torque of a drive source of the second conveyor.
    Type: Grant
    Filed: July 12, 2022
    Date of Patent: December 5, 2023
    Assignee: Konica Minolta, Inc.
    Inventors: Hidenori Mine, Masayuki Watanabe, Harumitsu Fujimori, Takanobu Shiki
  • Publication number: 20230286162
    Abstract: A posture of a component is to be accurately determined. A posture determination method is to determine, based on an image acquired for a component having a plurality of surfaces, a posture of the component. This posture determination method includes recognizing an outer shape of the component from the image, detecting a feature amount of a surface shape in a determination area being a part of the component based on the outer shape of the component recognized in the recognizing, and determining. In the determining, the posture of the component is determined by comparing a first reference amount indicating a reference feature amount in the determination area of a first surface of the component and a second reference amount indicating a reference feature amount in the determination area of a second surface of the component with the feature amount detected in the detecting.
    Type: Application
    Filed: November 2, 2022
    Publication date: September 14, 2023
    Applicant: KONICA MINOLTA, INC.
    Inventors: Tomoyoshi YUKIMOTO, Yasuyuki KAMAI, Shigeki NOZAWA, Harumitsu FUJIMORI, Kohei HAYASHI
  • Publication number: 20230095964
    Abstract: An image forming system includes: an image forming device that is disposed at a first conveyance path and forms an image on a recording medium that is a continuous sheet or a long sheet; a first conveyor that conveys the recording medium on the first conveyance path in a conveyance direction; an image reader that reads the image formed on the recording medium at a second conveyance path on a downstream side of the first conveyance path in the conveyance direction; a second conveyor that conveys the recording medium on the second conveyance path; and a controller that controls a speed of a drive source of the first conveyor and controls a torque of a drive source of the second conveyor.
    Type: Application
    Filed: July 12, 2022
    Publication date: March 30, 2023
    Applicant: Konica Minolta, Inc.
    Inventors: Hidenori Mine, Masayuki Watanabe, Harumitsu Fujimori, Takanobu Shiki
  • Publication number: 20220380164
    Abstract: A reading apparatus includes a reader, a conveyor, motors and a hardware processor. The reader reads a surface of a recording medium with an image formed. The conveyor includes rollers disposed along a conveyance path that passes through a reading area of the reader, and conveys the recording medium being laid across the rollers. The motors rotate the rollers. The hardware processor controls operations of the motors such that the rollers located farther downstream in a conveyance direction of the recording medium rotate faster. As to at least one motor of the motors, the hardware processor switches between and performs a first control to adjust a rotational speed and a second control to adjust a torque, depending on an operating state of the motor.
    Type: Application
    Filed: June 1, 2022
    Publication date: December 1, 2022
    Applicant: Konica Minolta, Inc.
    Inventors: Masayuki WATANABE, Hidenori MINE, Harumitsu FUJIMORI, Takanobu SHIKI
  • Publication number: 20220368807
    Abstract: A sheet conveyance apparatus includes: a speed detection roller that detects a conveyance speed of a sheet by coming into contact with the sheet being conveyed and being driven to rotate; and a hardware processor that performs temperature control to make an ambient temperature of the speed detection roller a predetermined temperature.
    Type: Application
    Filed: April 29, 2022
    Publication date: November 17, 2022
    Inventors: HARUMITSU FUJIMORI, SHOTA IGO, NAOTO SUGAYA, KENJI TAMAKI
  • Patent number: 11233471
    Abstract: A control circuit of a motor control device estimates an initial magnetic pole position of a rotor using an inductive sensing scheme. When estimating the initial magnetic pole position, a drive circuit applies a voltage to a stator winding at each of L electrical angles (L?5) while changing the L electrical angles. An absolute value of an electrical angle difference of the voltage applied to the stator winding between an i-th time (2?i?L) and an i?1st time is 180?360/L degrees or more and 180+360/L degrees or less. An absolute value of an electrical angle difference of the voltage applied to the stator winding between a 1st time for initial position estimation and a last time before starting initial position estimation is 180?360/L degrees or more and 180+360/L degrees or less.
    Type: Grant
    Filed: January 8, 2020
    Date of Patent: January 25, 2022
    Assignee: KONICA MINOLTA, INC.
    Inventors: Daichi Suzuki, Yuji Kobayashi, Kazumichi Yoshida, Harumitsu Fujimori, Yuta Tachibana, Hiroyuki Yoshikawa
  • Patent number: 11223309
    Abstract: In a motor control device that controls a sensorless-type motor, a controller estimates an initial magnetic pole position of a rotor of a motor by an inductive sensing scheme while sequentially setting a plurality of energization angles. At each of the set energization angles, the controller converts peak values of currents flowing through a plurality of phases of a stator winding into a first current component having an electrical angle that is equal to a corresponding one of the set energization angles and a second current component that is different in electrical angle by 90 degrees from the first current component, to correct the first current component based on the second current component. The controller estimates the initial magnetic pole position of the rotor based on the corrected first current component that is obtained at each of the set energization angles.
    Type: Grant
    Filed: February 18, 2020
    Date of Patent: January 11, 2022
    Assignee: KONICA MINOLTA, INC.
    Inventors: Hiroyuki Yoshikawa, Yuta Tachibana, Yuji Kobayashi, Kazumichi Yoshida, Daichi Suzuki, Harumitsu Fujimori
  • Patent number: 11218101
    Abstract: In a motor control device in one embodiment, an initial position estimation unit estimates an initial position of a magnetic pole of a rotor of a motor in an inductive sensing scheme. At each of energization angles, the initial position estimation unit multiplies a ?-axis current component I? corresponding to a peak value of a current flowing through a stator winding by each of a cosine value and a sine value of a correction angle obtained by correcting each of the energization angles. The initial position estimation unit estimates the initial position of the magnetic pole of the rotor based on a ratio between an integrated value of a multiplication result about the cosine value and an integrated value of a multiplication result about the sine value.
    Type: Grant
    Filed: March 11, 2020
    Date of Patent: January 4, 2022
    Assignee: KONICA MINOLTA, INC.
    Inventors: Yuta Tachibana, Hiroyuki Yoshikawa, Yuji Kobayashi, Kazumichi Yoshida, Daichi Suzuki, Harumitsu Fujimori
  • Publication number: 20200295688
    Abstract: In a motor control device that controls a sensorless-type motor, a controller estimates an initial magnetic pole position of a rotor of a motor by an inductive sensing scheme while sequentially setting a plurality of energization angles. At each of the set energization angles, the controller converts peak values of currents flowing through a plurality of phases of a stator winding into a first current component having an electrical angle that is equal to a corresponding one of the set energization angles and a second current component that is different in electrical angle by 90 degrees from the first current component, to correct the first current component based on the second current component. The controller estimates the initial magnetic pole position of the rotor based on the corrected first current component that is obtained at each of the set energization angles.
    Type: Application
    Filed: February 18, 2020
    Publication date: September 17, 2020
    Applicant: KONICA MINOLTA, INC.
    Inventors: Hiroyuki YOSHIKAWA, Yuta TACHIBANA, Yuji KOBAYASHI, Kazumichi YOSHIDA, Daichi SUZUKI, Harumitsu FUJIMORI
  • Publication number: 20200295689
    Abstract: In a motor control device in one embodiment, an initial position estimation unit estimates an initial position of a magnetic pole of a rotor of a motor in an inductive sensing scheme. At each of energization angles, the initial position estimation unit multiplies a ?-axis current component I? corresponding to a peak value of a current flowing through a stator winding by each of a cosine value and a sine value of a correction angle obtained by correcting each of the energization angles. The initial position estimation unit estimates the initial position of the magnetic pole of the rotor based on a ratio between an integrated value of a multiplication result about the cosine value and an integrated value of a multiplication result about the sine value.
    Type: Application
    Filed: March 11, 2020
    Publication date: September 17, 2020
    Inventors: Yuta TACHIBANA, Hiroyuki YOSHIKAWA, Yuji KOBAYASHI, Kazumichi YOSHIDA, Daichi SUZUKI, Harumitsu FUJIMORI
  • Patent number: 10734932
    Abstract: A motor controller that controls a motor in which a rotor using a permanent magnet is rotated by a rotating magnetic field due to a current flowing through a winding: performs hold control that continuously causes a fixed excitation current to flow through the winding to cause a fixed magnetic field for suppressing rotation of the rotor to be generated in a suspension period in which the motor is stopped; performs hold enhancement control that enhances the fixed magnetic field with input of a timing signal defined in advance as a trigger, in the suspension period; and starts rotational excitation control that generates the rotating magnetic field when a rotation start timing arrives.
    Type: Grant
    Filed: April 11, 2019
    Date of Patent: August 4, 2020
    Assignee: Konica Minolta, Inc.
    Inventors: Harumitsu Fujimori, Yuji Kobayashi, Kazumichi Yoshida
  • Publication number: 20200235683
    Abstract: A control circuit of a motor control device estimates an initial magnetic pole position of a rotor using an inductive sensing scheme. When estimating the initial magnetic pole position, a drive circuit applies a voltage to a stator winding at each of L electrical angles (L?5) while changing the L electrical angles. An absolute value of an electrical angle difference of the voltage applied to the stator winding between an i-th time (2?i?L) and an i?1st time is 180?360/L degrees or more and 180+360/L degrees or less. An absolute value of an electrical angle difference of the voltage applied to the stator winding between a 1st time for initial position estimation and a last time before starting initial position estimation is 180?360/L degrees or more and 180+360/L degrees or less.
    Type: Application
    Filed: January 8, 2020
    Publication date: July 23, 2020
    Applicant: KONICA MINOLTA, INC.
    Inventors: Daichi SUZUKI, Yuji KOBAYASHI, Kazumichi YOSHIDA, Harumitsu FUJIMORI, Yuta TACHIBANA, Hiroyuki YOSHIKAWA
  • Publication number: 20190341866
    Abstract: A motor controller that controls a motor in which a rotor using a permanent magnet is rotated by a rotating magnetic field due to a current flowing through a winding: performs hold control that continuously causes a fixed excitation current to flow through the winding to cause a fixed magnetic field for suppressing rotation of the rotor to be generated in a suspension period in which the motor is stopped; performs hold enhancement control that enhances the fixed magnetic field with input of a timing signal defined in advance as a trigger, in the suspension period; and starts rotational excitation control that generates the rotating magnetic field when a rotation start timing arrives.
    Type: Application
    Filed: April 11, 2019
    Publication date: November 7, 2019
    Applicant: KONICA MINOLTA, INC.
    Inventors: Harumitsu Fujimori, Yuji Kobayashi, Kazumichi Yoshida
  • Publication number: 20190068099
    Abstract: A motor controller for controlling a brushless DC motor is provided. The motor controller includes a vector control unit configured to perform a sensorless vector control on the brushless DC motor in accordance with an input command value; a storage portion configured to store time-series control target values so that an amount of rotation angle of the brushless DC motor transitions in a same manner as an expected pattern; and a command portion configured to input, to the vector control unit, the control target values serially as the command value.
    Type: Application
    Filed: August 22, 2018
    Publication date: February 28, 2019
    Applicant: KONICA MINOLTA, INC.
    Inventors: Kazumichi Yoshida, Yuji Kobayashi, Harumitsu Fujimori
  • Patent number: 10139767
    Abstract: An image forming apparatus that transfers an image from an image carrier onto a sheet passing between the image carrier rotating and a transfer member includes a fixing unit configured to thermally fix the image on the sheet while nipping and conveying the sheet with a pair of fixing members after the transfer, at least one of the fixing members rotating; a measuring unit configured to measure surface movement speed of the sheet in a non-contact manner while the sheet is being conveyed by the fixing members; and a control unit configured to control rotation speed of the fixing members in accordance with a result of the measurement, to adjust speed of conveyance of the sheet to a target speed determined beforehand for peripheral speed of the image carrier, the control being performed while the sheet being conveyed is in contact with the transfer member and the fixing members.
    Type: Grant
    Filed: June 8, 2016
    Date of Patent: November 27, 2018
    Assignee: Konica Minolta, Inc.
    Inventors: Yuji Kobayashi, Harumitsu Fujimori, Hiroshi Hiraguchi, Satoshi Chikazawa, Takaki Kato
  • Patent number: 10075607
    Abstract: A reading apparatus that reads a sheet includes: a first light emitting diode (LED) configured to emit light with a specific wavelength; a light emitting element including a second LED configured to emit light with the specific wavelength and a phosphor configured to be excited by the light emitted from the second LED; a line sensor configured to generate a reference signal according to a quantity of received light emitted from the first LED and reflected off the sheet, and also generate an image signal according to a quantity of received light emitted from the light emitting element and reflected off the sheet; and a controller configured to generate an image representing the sheet from a differential result obtained by removing a component corresponding to the reference signal from the image signal.
    Type: Grant
    Filed: February 28, 2017
    Date of Patent: September 11, 2018
    Assignee: KONICA MINOLTA, INC.
    Inventors: Hitoshi Asano, Katsuhide Sakai, Tomonobu Tamura, Harumitsu Fujimori
  • Publication number: 20180175751
    Abstract: A controller for a permanent magnet synchronous motor having a rotor using a permanent magnet is provided. The rotor rotates by a rotating magnetic field caused by a current flowing through an armature. The controller starts a deceleration control of reducing a rotational speed of the rotor when a stop command is inputted in a state where the rotor rotates at a predetermined rotational speed; and performs a fixed excitation control when the rotational speed is reduced to a set speed. The fixed excitation control includes setting a current for causing a magnetic field vector for stopping the rotor at a target position in accordance with an amount of rotation of the rotor since the deceleration control has started and passing the current through the armature.
    Type: Application
    Filed: December 13, 2017
    Publication date: June 21, 2018
    Applicant: Konica Minolta, Inc.
    Inventors: Kazumichi Yoshida, Katsuhide Sakai, Tomonobu Tamura, Hitoshi Asano, Harumitsu Fujimori
  • Publication number: 20180076750
    Abstract: A controller for a permanent magnet synchronous motor having a rotor using a permanent magnet includes a drive portion configured to apply a current to a winding to drive the rotor; an estimating portion configured to estimate a position of magnetic pole of the rotor; and a control unit configured to control the drive portion to cause the rotating magnetic field based on the estimated position of magnetic pole and to control the drive portion to stop the rotor in response to a stop command inputted. The control unit controls, as the control to stop the rotor, the drive portion to determine a current for generating a magnetic field vector which draws the position of magnetic pole of the rotor to a stop position to stop the rotor based on a latest estimated position of magnetic pole, and to keep applying the current determined to the winding.
    Type: Application
    Filed: August 22, 2017
    Publication date: March 15, 2018
    Applicant: KONICA MINOLTA, INC.
    Inventors: Kazumichi YOSHIDA, Katsuhide SAKAI, Tomonobu TAMURA, Hitoshi ASANO, Harumitsu FUJIMORI
  • Publication number: 20170272599
    Abstract: A reading apparatus that reads a sheet includes: a first light emitting diode (LED) configured to emit light with a specific wavelength; a light emitting element including a second LED configured to emit light with the specific wavelength and a phosphor configured to be excited by the light emitted from the second LED; a line sensor configured to generate a reference signal according to a quantity of received light emitted from the first LED and reflected off the sheet, and also generate an image signal according to a quantity of received light emitted from the light emitting element and reflected off the sheet; and a controller configured to generate an image representing the sheet from a differential result obtained by removing a component corresponding to the reference signal from the image signal.
    Type: Application
    Filed: February 28, 2017
    Publication date: September 21, 2017
    Inventors: Hitoshi Asano, Katsuhide Sakai, Tomonobu Tamura, Harumitsu Fujimori