Patents by Inventor Tetsuo Masukawa

Tetsuo Masukawa 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).

  • Patent number: 5383073
    Abstract: A magnetic head includes a gimbal with a head slider attached thereon, a load beam retained on the gimbal, and a mount attached on an end portion of the load beam on a side opposite to a side where the head slider is attached. A fulcrum portion as a center of load of the head slider is set on the gimbal to be shifted from a center of the head slider along its longitudinal direction to a proximal end side of the load beam, namely, toward an air upstream side. To compensate for the imbalance of the floating force due to the shift of the fulcrum portion, there is generated a moment about the fulcrum portion. The moment is provided by assigning an inclination angle to a slider attaching surface of the gimbal. The inclination angle can be adjusted by the height of the projection formed as the fulcrum portion. Moreover, the moment is generated by disposing rails on the head slider such that the width on the air upstream side of each rail is wider than the width on the air downstream side of the rail.
    Type: Grant
    Filed: July 22, 1992
    Date of Patent: January 17, 1995
    Assignee: Hitachi, Ltd.
    Inventors: Tetsuo Masukawa, Masaaki Matsumoto, Yokuo Saitoh, Yasuo Kojima, Toshio Suzuki, Yukimori Umakoshi, Kiyoji Morita
  • Patent number: 5377064
    Abstract: A structure for supporting a magnetic head slider for a linear magnetic disk unit comprises: a magnetic head slider having air bearing rails located opposite to a magnetic disk so as to extend in a direction of a track of the magnetic disk; a gimbal for elastically supporting the magnetic head slider, the gimbal being bonded to a back surface of the magnetic head slider on a side reverse to the air bearing rail; and a support arm having the gimbal secured to its distal end, whose axis extends in a direction perpendicular to the air bearing rail, which support arm gives the magnetic head slider a pressing force toward the magnetic disk.
    Type: Grant
    Filed: September 7, 1993
    Date of Patent: December 27, 1994
    Assignee: Hitachi, Ltd.
    Inventors: Yasuhiro Yaginuma, Jyousei Shimizu, Tetsuo Masukawa, Noriki Une, Shigeo Nakamura, Masami Miyatake, Mikio Tokuyama, Yoshinori Takeuchi, Satomitsu Imai, Kenji Mori
  • Patent number: 5251083
    Abstract: A flying head slider has a slider body in which gas bearing rails are formed on a surface thereof disposed in opposed relation to a recording medium. A bleed portion is also provided at the surface of the slider body between a pair of gas bearing rails. The bleed portion is composed of at least a rectangular-shaped deep bleed portion in which the pair of longer sides thereof are directioned in parallel to the longitudinal axis direction of the gas bearing rails.
    Type: Grant
    Filed: June 8, 1992
    Date of Patent: October 5, 1993
    Assignee: Hitachi, Ltd.
    Inventors: Yoshinori Takeuchi, Yuzo Yamaguchi, Fumitaka Muranushi, Katsuyuki Tanaka, Kanji Kawakami, Hiroshi Daito, Tetsuo Masukawa
  • Patent number: 5128821
    Abstract: A flying head slider has gas bearing rails formed on a surface thereof disposed in opposed relation to a recording medium. The flying head slider flies at a microscopic distance above the recording medium by a pressure produced by a stream of gas resulted from the rotation of the recording medium. Each of the gas bearing rails comprises an inflow portion disposed at an inflow side of the gas stream so as to produce a pressure, an outflow portion disposed at an outflow side of the gas stream so as to produce a pressure, and a connective portion interconnecting the inflow portion and the outflow portion in a common plane. The connective portion serves to suppress an excessive compression of the gas, and achieves good damping characteristics.
    Type: Grant
    Filed: May 29, 1990
    Date of Patent: July 7, 1992
    Assignee: Hitachi, Ltd.
    Inventors: Yoshinori Takeuchi, Yuzo Yamaguchi, Fumitaka Muranushi, Katsuyuki Tanaka, Kanji Kawakami, Hiroshi Daito, Tetsuo Masukawa
  • Patent number: 5014144
    Abstract: An apparatus for supporting and reciprocating a magnetic head slider above a rotating magnetic disk comprises a carrying arm having a free end, a flexible base connected at one end thereof to the free end of the supporting arm, a pair of flexible fingers extending from the other end of the flexible base parallel to an axis of the carrying arm and defining therebetween a space, a traverse bar connecting two free ends of the fingers, and a flexible tongued member on which the magnetic head slider to be mounted, one end of the tongued member being connected to the traverse bar and the other end thereof extending into the space with gaps between the tongued member and the fingers and the base. A reduced part of a minimum cross-section is provided in each of the fingers. The reduced part is located between the one end of the tongued member and a center between the one end of the tongued member and the other end of the base.
    Type: Grant
    Filed: June 13, 1989
    Date of Patent: May 7, 1991
    Assignee: Hitachi, Ltd.
    Inventors: Taichi Sato, Yoshiharu Mouri, Kihachiro Tanaka, Yokuo Saitoh, Hiroshi Daito, Tetsuo Masukawa, Yoshinori Takeuchi, Yuzo Yamaguchi, Satomitsu Imai