Patents by Inventor Kotaro Yamamoto

Kotaro Yamamoto 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: 20060067006
    Abstract: A magnetic head includes a read head including a read element and two layers of shields sandwiching the read element therebetween, and a write head including a main pole, a return yoke, and an exciting coil, in which at least one of each of the shields and the return yoke has an area of a bottom surface at least 1.2 times as large as an area of a top surface.
    Type: Application
    Filed: September 27, 2005
    Publication date: March 30, 2006
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Masayuki Takagishi, Kotaro Yamamoto, Tomoko Taguchi
  • Publication number: 20060007574
    Abstract: A patterned disk medium having a first surface and a second surface opposed to the first surface, includes a data pattern area formed in advance on each of the first surface and the second surface, a servo pattern area formed in advance like an arc in a radial direction, which divides the data pattern area in a plurality of pattern areas in a circumferential direction, and positioning marks formed used for positioning when the servo pattern area and the data pattern area are formed in advance.
    Type: Application
    Filed: July 14, 2005
    Publication date: January 12, 2006
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Shuuichi Kojima, Makoto Asakura, Kotaro Yamamoto
  • Publication number: 20030144613
    Abstract: Disclosed is an orthopedic apparatus for effecting the manipulatively equivalent treatment of disorders of the skeletal system by using one's weight to stretch one's body. It comprises: a base having a rotary axle provided therewith; a body bearing board responsive to rotation of the rotary axle for inclining about the rotary axle, thereby raising or lowering one or the other end of the body bearing board; and a console for determining an oblique angle at which the body bearing board is inclined, selecting which direction the body bearing board is inclined, clockwise or counterclockwise, the length of time for which the body bearing board is kept inclined and determining other variables in operation. The body bearing board comprises a leg shaking section for holding the opposite legs of one's body and for shaking them horizontally, a longitudinal, parallel arrangement of rotatable rolls and a head holding section for holding the head of the patient lying on the body bearing board.
    Type: Application
    Filed: January 24, 2003
    Publication date: July 31, 2003
    Inventors: Isao Kitada, Kotaro Yamamoto
  • Patent number: 6462897
    Abstract: A read head of a head device used in a disk storage apparatus is provided including a spin-valve magnetoresistive (MR) element. The spin-valve MR element comprises a pinning magnetic layer of which magnetizing direction is determined, a free magnetic layer of which magnetizing direction can be shifted by a signal magnetic field derived from the disk, and a non-magnetic layer sandwiched between the pinning magnetic layer and the free magnetic layer. The head also includes a remagnetization layer which functions as a control element for correcting the magnetizing direction of the pinning magnetic layer.
    Type: Grant
    Filed: August 16, 2000
    Date of Patent: October 8, 2002
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Kotaro Yamamoto
  • Patent number: 6128160
    Abstract: A read head of a head device used in a disk storage apparatus is provided including a spin-valve magnetoresistive (MR) element. The spin-valve MR element comprises a pinning magnetic layer of which magnetizing direction is determined, a free magnetic layer of which magnetizing direction can be shifted by a signal magnetic field derived from the disk, and a non-magnetic layer sandwiched between the pinning magnetic layer and the free magnetic layer. The head also includes a remagnetization layer which functions as a control element for correcting the magnetizing direction of the pinning magnetic layer.
    Type: Grant
    Filed: April 24, 1998
    Date of Patent: October 3, 2000
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Kotaro Yamamoto
  • Patent number: 5982568
    Abstract: A data storage system that uses a magnetic head assembly having a write head and a read head mounted on a slider to write on and read from a disk. A portion of the coil of the write head is used as a wear sensor for detecting wear on the surface of the slider. A head IC monitors the coil voltage and, when it goes lower than a reference voltage, detects the occurrence of a fault in the write head due to excessive wear on the slider surface. In response to the detection of the fault in the write head by the head IC, a control driver prohibits a write operation and saves data already recorded on the disk.
    Type: Grant
    Filed: September 9, 1997
    Date of Patent: November 9, 1999
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kotaro Yamamoto, Masaaki Habata
  • Patent number: 5825581
    Abstract: A magnetic disk drive, which controls the seek and positioning of a magnetic head for recording and reproducing data to a specific position on the magnetic disk in accordance with the servo data recorded in the magnetic disk, comprises measuring means for measuring one of an atmospheric pressure and a height above sea level and head positioning control means for setting a seek speed in accordance with the measured values measuring by said measuring means, and for controlling the seek and positioning of the magnetic head to the specific position on the disk at the set seek speed.
    Type: Grant
    Filed: September 27, 1996
    Date of Patent: October 20, 1998
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yasuhiro Morita, Kotaro Yamamoto
  • Patent number: 5636088
    Abstract: The dimension ratio t/H of the thickness t of a flexure spring to the height (thickness) H of a slider 17 is set at 0.047 or less in order to reduce the variation in crown amount due to a temperature variation. As the ratio of the thickness t of the flexure spring to the height H of the slider decreases, the stress acting in the slider due to a difference in linear expansion coefficient between itself and the flexure spring decreases and the rigidity of the slider increases relative to the flexure spring. The dimension ratio H/L of the height H of the slider to the length L thereof is set at 0.245 or more. As the dimension ratio H/L increases, the rigidity of the slider increases and the amount of deformation of the slider due to a difference in linear expansion coefficient between itself and the flexure spring decreases. In addition, the ratio A2/A1 of an actual adhesion area A2 between the slider and a slider fixing portion of the flexure spring to a possible adhesion area A1 therebetween is reduced to 0.
    Type: Grant
    Filed: November 23, 1994
    Date of Patent: June 3, 1997
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kotaro Yamamoto, Norio Yoshikawa, Masahito Yamaguchi, Masaaki Habata, Koji Osafune, Toshiaki Hattori, Toshikuni Sato