Patents by Inventor Tuzuku Masayuki

Tuzuku Masayuki 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).

  • Apparatus for providing uniform attractive force to a magnetic disk hub in a magnetic disk drive
    Patent number: 5072321
    Abstract: Apparatus for rotating and driving a magnetic disk in which a hub of a magnetic disk is magnetically attracted against a hub support, and a driving pin provided on the hub support is engaged with an engaging hole provided in the disk hub. The hub support has a magnetic attractive surface which is high in magnetic flux density in the vicinity of the driving pin and continuously and gradually lowers in magnetic flux density as a function of distance from the driving pin, so that the magnetic disk can be attracted by an approximately uniform net attractive force over the entire surface of the hub support.
    Type: Grant
    Filed: November 27, 1989
    Date of Patent: December 10, 1991
    Assignee: Sankyo Seiki Mfg. Co., Ltd.
    Inventors: Takashi Kanai, Kunio Miyazaki, Tuzuku Masayuki