Patents by Inventor Hisashi Nakahara

Hisashi Nakahara 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).

  • Image heating apparatus
    Publication number: 20030077092
    Abstract: The image heating apparatus for heating an image formed on a recording material, comprising a sliding member and a supporting member for holding the sliding member and a pressure member which forms a nip part, wherein a portion of said supporting member which forms the nip part projects from a surface of the sliding member on the nip part side. The image heating apparatus can suppress a decrease in durability of a flexible rotary body.
    Type: Application
    Filed: October 8, 2002
    Publication date: April 24, 2003
    Applicant: Canon Kabushiki Kaisha
    Inventors: Kenichi Ogawa, Michihito Yamazaki, Ken Murooka, Noriaki Tanaka, Noriyuki Ito, Yusuke Nakazono, Hiroyuki Sakakibara, Akira Kato, Hisashi Nakahara, Satoshi Nishida
  • Image forming apparatus having transferring roller of small diameter
    Patent number: 6526251
    Abstract: The present invention provides an image forming apparatus, which has a roller-shaped image bearing member bearing a toner image thereon, and a transferring roller pressure-contacted with the image bearing member for transferring the toner image on the image bearing member to a transferring material, a radius of the transferring roller being 12 mm or less, wherein r/R<0.4 where r is the radius of the transferring roller, and R is the radius of the image bearing member.
    Type: Grant
    Filed: October 6, 2000
    Date of Patent: February 25, 2003
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yasumasa Otsuka, Koichi Otaka, Daizo Fukuzawa, Yoshiyuki Yamazaki, Hisashi Nakahara
  • Image forming apparatus using shaped toner particles and transfer roller pressure for fine image quality
    Patent number: 6424814
    Abstract: An image forming apparatus is disclosed in which a specific toner is used, and a transferring means has a transfer roller which is in contact with the surface of an electrostatic image bearing member and rotates when the electrostatic image bearing member rotates. The toner is comprised of particles which have a weight average particle diameter of 4 to 12 &mgr;m, and in a circularity distribution for particles 3 &mgr;m or more in circle-equivalent diameter which are included in the toner, particles having a circularity of 0.90 or more account for 90% by number or more.
    Type: Grant
    Filed: February 22, 2001
    Date of Patent: July 23, 2002
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yasumasa Otsuka, Daizo Fukuzawa, Hisashi Nakahara
  • Image forming apparatus
    Publication number: 20020003979
    Abstract: An image forming apparatus is disclosed in which a specific toner is used, and a transferring means has a transfer roller which is in contact wit the surface of an electrostatic image bearing member and rotates when the electrostatic image bearing member rotates. The toner is comprised of particles which have a weight average particle diameter of 4 to 12 &mgr;m, and in a circularity distribution for particles 3 &mgr;m or more in circle-equivalent diameter which are included in the toner, particles having a circularity of 0.90 or more account for 90% by number or more.
    Type: Application
    Filed: February 22, 2001
    Publication date: January 10, 2002
    Inventors: Yasumasa Otsuka, Daizo Fukuzawa, Hisashi Nakahara
  • Image fixing device with heater control
    Patent number: 6175699
    Abstract: An image fixing apparatus has a heating member, a back-up roller cooperating with the heating member to form a nip therebetween for pinching and conveying a recording material bearing an image thereon, and a controlling device for controlling a temperature of the nip. The controlling device heats the nip after a fixing process is finished and after a rotation of the back-up roller is stopped.
    Type: Grant
    Filed: May 24, 1999
    Date of Patent: January 16, 2001
    Assignee: Canon Kabushiki Kaisha
    Inventors: Akira Kato, Yasumasa Otsuka, Yoji Tomoyuki, Akira Hayakawa, Daizo Fukuzawa, Mahito Yoshioka, Masahide Hirai, Ken Nakagawa, Hisashi Nakahara