Patents by Inventor Sinzi Hiraoka

Sinzi Hiraoka 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).

  • Electro-magnetic shield structure for shielding a servo magnetic head of a magnetic disk storage device
    Patent number: 4935830
    Abstract: A magnetic disk storage device having a magnetic shield for shielding a magnetic servo-head from noise generated by an adjacent data-head during a write operation when both magnetic heads are arranged back-to-back in a space between two magnetic disks stacked co-axially. The shield plate is secured to an inner surface of a base portion of a housing of the device, thus avoiding an increase in the weight and moment of inertia of moving members of a head positioner.
    Type: Grant
    Filed: March 15, 1988
    Date of Patent: June 19, 1990
    Assignee: Fujitsu Limited
    Inventors: Sinzi Hiraoka, Kazuo Matsuda, Takeshi Ohyama