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).

  • 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
  • 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
  • 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
  • Patent number: 9529422
    Abstract: An image display and photographing system includes a display device configured to display a target image on a surface; a photographing device configured to photograph the surface; a first detector configured to detect that an object moves away from a space between the surface and the photographing device; a second detector configured to detect that, after the first detector detects that the object moves away from the space, the surface is touched at a predetermined position; a third detector configured to detect that, after the second detector detects that the surface is touched at the predetermined position, the object moves away from the space; and a photographing control portion configured to control, after the third detector detects that the object moves away from the space, the photographing device to photograph the surface.
    Type: Grant
    Filed: May 7, 2015
    Date of Patent: December 27, 2016
    Assignee: KONICA MINOLTA, INC.
    Inventors: Yuji Kobayashi, Harumitsu Fujimori, Akihiro Hayashi, Shiro Umeda, Kosuke Masumoto, Yasuhiro Ishihara, Hiroshi Yamaguchi, Isao Watanabe
  • Publication number: 20160370740
    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: Application
    Filed: June 8, 2016
    Publication date: December 22, 2016
    Applicant: KONICA MINOLTA, INC.
    Inventors: YUJI KOBAYASHI, HARUMITSU FUJIMORI, HIROSHI HIRAGUCHI, SATOSHI CHIKAZAWA, TAKAKI KATO
  • Publication number: 20150373283
    Abstract: A photographing system includes a photographing device configured to photograph a surface; a detector configured to detect a change in a position of an object in a space between the surface and the photographing device; and an obtaining portion configured to obtain an image of an area of the surface by the photographing device when the detector detects the change, the area being not viewed by the photographing device before the change due to interruption of the object and being viewed by the photographing device after the change.
    Type: Application
    Filed: June 22, 2015
    Publication date: December 24, 2015
    Applicant: KONICA MINOLTA, INC.
    Inventors: Akihiro HAYASHI, Yuji KOBAYASHI, Harumitsu FUJIMORI, Shiro UMEDA, Kosuke MASUMOTO, Yasuhiro ISHIHARA, Hiroshi YAMAGUCHI, Isao WATANABE
  • Patent number: 9201361
    Abstract: Provided is an image forming apparatus including: a heater heating a fixing member; an acquisition unit acquiring, when an image for one page includes a coded identifier image, information on a range of formation of the coded identifier image on a recording sheet in a sheet-passing direction; a target temperature switching unit switching a target temperature at which temperature of the fixing member is to be maintained at least between a first fixing temperature and a second fixing temperature higher than the first fixing temperature; a controller controlling the heater so that the temperature of the fixing member is maintained at the target temperature, wherein the target temperature switching unit switches the target temperature at a timing such that the temperature of the fixing member is equal to the second fixing temperature while a toner image in the range of formation of the coded identifier image is being fixed.
    Type: Grant
    Filed: September 18, 2014
    Date of Patent: December 1, 2015
    Assignee: KONICA MINOLTA, INC.
    Inventor: Harumitsu Fujimori
  • Publication number: 20150324005
    Abstract: An image display and photographing system includes a display device configured to display a target image on a surface; a photographing device configured to photograph the surface; a first detector configured to detect that an object moves away from a space between the surface and the photographing device; a second detector configured to detect that, after the first detector detects that the object moves away from the space, the surface is touched at a predetermined position; a third detector configured to detect that, after the second detector detects that the surface is touched at the predetermined position, the object moves away from the space; and a photographing control portion configured to control, after the third detector detects that the object moves away from the space, the photographing device to photograph the surface.
    Type: Application
    Filed: May 7, 2015
    Publication date: November 12, 2015
    Applicant: KONICA MINOLTA, INC.
    Inventors: Yuji KOBAYASHI, Harumitsu FUJIMORI, Akihiro HAYASHI, Shiro UMEDA, Kosuke MASUMOTO, Yasuhiro ISHIHARA, Hiroshi YAMAGUCHI, Isao WATANZABE
  • Publication number: 20150086230
    Abstract: Provided is an image forming apparatus including: a heater heating a fixing member; an acquisition unit acquiring, when an image for one page includes a coded identifier image, information on a range of formation of the coded identifier image on a recording sheet in a sheet-passing direction; a target temperature switching unit switching a target temperature at which temperature of the fixing member is to be maintained at least between a first fixing temperature and a second fixing temperature higher than the first fixing temperature; a controller controlling the heater so that the temperature of the fixing member is maintained at the target temperature, wherein the target temperature switching unit switches the target temperature at a timing such that the temperature of the fixing member is equal to the second fixing temperature while a toner image in the range of formation of the coded identifier image is being fixed.
    Type: Application
    Filed: September 18, 2014
    Publication date: March 26, 2015
    Applicant: KONICA MINOLTA, INC.
    Inventor: Harumitsu FUJIMORI
  • Patent number: 8831457
    Abstract: A fixing device includes an excitation coil, a fixing member heated by electromagnetic induction by the excitation coil, a magnetic shunt alloy member, a Curie temperature of which is higher than a target fixing temperature, a determiner that determines whether the temperature of a non-sheet passing region of the fixing member is about to reach the Curie temperature, and a power controller that controls power supplied to the excitation coil. Until the determiner determines that the Curie temperature is about to be reached, the power controller performs feedback control to provide power to the excitation coil. When the determiner determines that the Curie temperature is about to be reached, the power controller switches to fixed power control so that a difference between power supplied when the Curie temperature is about to be reached and power supplied after reaching the Curie temperature falls within an allowable range.
    Type: Grant
    Filed: November 30, 2012
    Date of Patent: September 9, 2014
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Hiroyuki Yoshikawa, Isao Watanabe, Harumitsu Fujimori
  • Patent number: 8705053
    Abstract: Attachment of a USB memory is sensed and whether the USB memory can be recognized or not is determined based on data information output from the USB memory. When the USB memory cannot be recognized, an emulation transition screen is displayed. Thereafter, when an instruction to start transition to an emulation mode is given, an emulation mode transition instruction signal and an IP address of an MFP on a network are output. Receiving the input of the emulation mode transition instruction signal, an emulation mode start-up/end unit starts up the emulation mode.
    Type: Grant
    Filed: June 17, 2009
    Date of Patent: April 22, 2014
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Hiroyasu Ito, Ichiro Bessho, Harumitsu Fujimori
  • Patent number: 8576415
    Abstract: Attachment of a USB memory is sensed and whether the USB memory can be recognized or not is determined based on data information output from the USB memory. When the USB memory cannot be recognized, an emulation transition screen is displayed. Thereafter, when an instruction to start transition to an emulation mode is given, an emulation mode transition instruction signal and an IP address of an MFP on a network are output. Receiving the input of the emulation mode transition instruction signal, an emulation mode start-up/end unit starts up the emulation mode.
    Type: Grant
    Filed: June 17, 2009
    Date of Patent: November 5, 2013
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Harumitsu Fujimori, Hiroyasu Ito, Ichiro Bessho