Patents by Inventor Junji Murakawa

Junji Murakawa 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: 20210063915
    Abstract: A developing roller includes: a magnet roller including a roll part with a magnetic pole; a cylindrical sleeve that houses the magnet roller; a first flange connected to one end of the sleeve; a second flange connected to another end of the sleeve; a conductive shaft connected to a side of the second flange of the magnet roller; a first bearing that supports the first flange so that the first flange rotates relative to the magnet roller; and second bearings that support the second flange so that the second flange rotates relative to the conductive shaft. The second bearings are conductive, and are disposed at different positions along an axial direction of the conductive shaft.
    Type: Application
    Filed: August 7, 2020
    Publication date: March 4, 2021
    Applicant: Konica Minolta, Inc.
    Inventors: Junji Murakawa, Takeru Kinoshita, Hideaki Ikeda
  • Publication number: 20210003938
    Abstract: A developing device, includes: a developing sleeve supported rotatably, the developing sleeve having a hollow, substantially cylindrical shape; a magnet part having a substantially columnar shape, the magnet part having magnetic poles disposed side by side around an axis, the magnet part being disposed substantially coaxially with the developing sleeve inside the developing sleeve; a rod fastened to the magnet part, the rod extending from one end in an extending direction of the axis of the magnet part, the rod being pulled out from one axial end of the developing sleeve; and a holder attached to a portion of the rod pulled out from the developing sleeve, the holder being fastened to a fastening target, the holder maintaining the rod, the holder regulating rotation of the magnet part, wherein adjustment of the holder in fastening position enables disposition and holding of the rod at an optional position.
    Type: Application
    Filed: June 17, 2020
    Publication date: January 7, 2021
    Inventors: Futoshi OKAZAKI, Yasuyuki INADA, Noriyuki KINPARA, Hideaki IKEDA, Takeru KINOSHITA, Junji MURAKAWA
  • Patent number: 9529301
    Abstract: An image forming apparatus comprises image forming sections for each color, each including a pressure receiving parts pair in a first outer region of a first rotary body and a second rotary body as an image carrier and a developing roller. A first image forming section includes a first pressure receiving part of the first rotary body and a second pressure receiving part of the second rotary body as the pressure receiving parts pair. A second image forming section includes a third pressure receiving part of the first rotary body and a fourth pressure receiving part of the second rotary body as the pressure receiving parts pair. A protruding distance of the first pressure receiving part is smaller than a protruding distance of the third pressure receiving part. A protruding distance of the second pressure receiving part is larger than a protruding distance of the fourth pressure receiving part.
    Type: Grant
    Filed: February 10, 2016
    Date of Patent: December 27, 2016
    Assignee: KONICA MINOLTA, INC.
    Inventors: Junji Murakawa, Takeru Kinoshita, Hideji Hayashi
  • Publication number: 20160246214
    Abstract: An image forming apparatus comprises image forming sections for each color, each including a pressure receiving parts pair in a first outer region of a first rotary body and a second rotary body as an image carrier and a developing roller. A first image forming section includes a first pressure receiving part of the first rotary body and a second pressure receiving part of the second rotary body as the pressure receiving parts pair. A second image forming section includes a third pressure receiving part of the first rotary body and a fourth pressure receiving part of the second rotary body as the pressure receiving parts pair. A protruding distance of the first pressure receiving part is smaller than a protruding distance of the third pressure receiving part. A protruding distance of the second pressure receiving part is larger than a protruding distance of the fourth pressure receiving part.
    Type: Application
    Filed: February 10, 2016
    Publication date: August 25, 2016
    Applicant: KONICA MINOLTA, INC.
    Inventors: Junji MURAKAWA, Takeru KINOSHITA, Hideji HAYASHI
  • Patent number: 8559847
    Abstract: In an imaging unit including a drum cartridge having an image carrier composed of a photosensitive drum and a development device having a development roller facing the image carrier, the development device developing an electrostatic latent image formed on the image carrier to form a toner image. The drum cartridge and the development device are provided so as to be allowed to be connected to and separated from each other. The drum cartridge and the development device, when connected to each other, can be made to pivot relative to each other on a shaft of the development roller of the development device.
    Type: Grant
    Filed: September 4, 2009
    Date of Patent: October 15, 2013
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventor: Junji Murakawa
  • Publication number: 20110200358
    Abstract: In an imaging unit including a drum cartridge having an image carrier composed of a photosensitive drum and a development device having a development roller facing the image carrier, the development device developing an electrostatic latent image formed on the image carrier to form a toner image. The drum cartridge and the development device are provided so as to be allowed to be connected to and separated from each other. The drum cartridge and the development device, when connected to each other, can be made to pivot relative to each other on a shaft of the development roller of the development device.
    Type: Application
    Filed: September 4, 2009
    Publication date: August 18, 2011
    Applicant: Konica Minolta Business Technologies, Inc.
    Inventor: Junji Murakawa