Patents by Inventor Koichi Tohkairin

Koichi Tohkairin 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).

  • DISK APPARATUS WITH REAL-TIME ECCENRICITY CORRECTION
    Publication number: 20010013989
    Abstract: For a balance adjustment due to a reduction in size and weight of an actuator, an arm portion, an axis attaching portion, and a coil supporting portion are arranged so that the centers of gravity on the coil side are located on a straight line connecting a rotational center and the center of gravity on the head side. Further, the improvement of an assembling efficiency of a VCM, an increase in torque, a one-touch fixing of an FPC connecting band, a noise prevention of a read pattern, and an insulation between the base and cover due to a bias of an MR read head are accomplished. A sector mark is detected by comparing a peak detection pulse and its reference polarity signal. A redundancy is provided to a reference detection polarity signal so that a read signal can be detected even if any one of the read signals of the sector marks is dropped out.
    Type: Application
    Filed: April 24, 1998
    Publication date: August 16, 2001
    Applicant: FUJITSU LIMITED
    Inventors: MASARU SAIKI, TSUTOMU SASAKI, HIROKAZU ISHIZAKI, EIJI OKAMURA, TATSUYA GOFUKU, NORIHIKO SUZUKI, KOICHI TOHKAIRIN, HIROFUMI SUZUKI, KENJI ENDO, CHIHIRO ONO, KAZUHIDE OHBA, ATSUSHI SATOH, EISAKU TAKAHASHI, TAKASHI TOKAIRIN, ISAO SUDA, TAKAHIRO ONO
  • Disk apparatus with voice coil motor
    Patent number: 5963398
    Abstract: A disk apparatus has an actuator supporting a head and a motor for rotating the actuator. The motor has a flat movable coil supported by the actuator and a pair of permanent magnets supported by a pair of yokes. The coil moves in a space defined between the permanent magnets. The yokes are fixed to each other by an adsorption by the permanent magnets. An inner edge of the coils overlaps an outer edge of the permanent magnets.
    Type: Grant
    Filed: February 18, 1997
    Date of Patent: October 5, 1999
    Assignee: Fujitsu Limited
    Inventor: Koichi Tohkairin
  • Head positioning control for disk apparatus using peak detection, polarity detection and sector mark detection
    Patent number: 5798885
    Abstract: For a balance adjustment due to a reduction in size and weight of an actuator, an arm portion, an axis attaching portion, and a coil supporting portion are arranged so that the centers of gravity on the coil side are located on a straight line connecting a rotational center and the center of gravity on the head side. Further, the improvement of an assembling efficiency of a VCM, an increase in torque, a one-touch fixing of an FPC connecting band, a noise prevention of a read pattern, and an insulation between the base and cover due to a bias of an MR read head are accomplished. A sector mark is detected by comparing a peak detection pulse and its reference polarity signal. A redundancy is provided to a reference detection polarity signal so that a read signal can be detected even if any one of the read signals of the sector marks is dropped out.
    Type: Grant
    Filed: May 5, 1995
    Date of Patent: August 25, 1998
    Assignee: Fujitsu Limited
    Inventors: Masaru Saiki, Tsutomu Sasaki, Hirokazu Ishizaki, Eiji Okamura, Tatsuya Gofuku, Norihiko Suzuki, Koichi Tohkairin, Hirofumi Suzuki, Kenji Endo, Chihiro Ono, Kazuhide Ohba, Atsushi Satoh, Eisaku Takahashi, Takashi Tokairin, Isao Suda, Takahiro Ono