Patents by Inventor Kiyomitsu Ohtsuka

Kiyomitsu Ohtsuka 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).

  • Head positioning mechanism for magnetic disc memory device
    Patent number: 4423447
    Abstract: A magnetic head positioning mechanism positions a magnetic head carried on a carriage at a specific location on a magnetic disc through the movement of a belt mounted to a motor spindle of a step motor. The magnetic head positioning mechanism pulls one end of a belt of which the other end is wound or unwound around a motor pulley, thereby to constantly apply a rotation torque and thereby to eliminate an adverse effect by a dead zone due to the hysteresis phenomenon of the step motor. Alternatively, the rotation torque is always applied to the step motor by pulling the carriage in an access direction, thereby to improve the positioning accuracy of the head.
    Type: Grant
    Filed: March 24, 1981
    Date of Patent: December 27, 1983
    Assignee: Hitachi, Ltd.
    Inventors: Hiroshi Nishida, Tuyoshi Takahashi, Toshio Shiono, Kiyomitsu Ohtsuka