Patents by Inventor Shuichi Hanabusa

Shuichi Hanabusa 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).

  • Magnetic head driving mechanism for a magnetic disk drive
    Patent number: 4734804
    Abstract: A damped magnetic head driver for a stepping motor driver. A damper is attached to a shaft of the stepping motor. A lightweight sealed housing of the damper is rigidly attached to the shaft and contains a hollow portion. A heavy flywheel is fitted in the hollow and is supported on the shaft by ball bearings. A viscous fluid fills the remainder of the hollow. In a further improvement, a circumferential surface of the damper housing has a series of teeth that are engaged by a plunger when power to the disc drive is interrupted.
    Type: Grant
    Filed: February 27, 1985
    Date of Patent: March 29, 1988
    Assignee: NEC Corporation
    Inventor: Shuichi Hanabusa