Patents by Inventor Katsumi Takeyama

Katsumi Takeyama 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).

  • Polishing apparatus with a balance adjusting unit
    Patent number: 6458021
    Abstract: A polishing apparatus includes a lapping tape for polishing a surface of a magnetic disc, a tape supply unit for supplying the lapping tape, a varnisher roller for pressing the lapping tape onto the surface of the magnetic disc, and a pressing unit for pressing the lapping tape to the surface of the magnetic disc by way of the varnisher roller. The pressing unit is constituted by a swing lever having the varnisher roller at one end portion, and a balance adjusting unit. The balance adjusting unit sets the pressing force to zero by establishing the balance of the swing lever, and then breaks the balance so as to press the lapping tape to the surface of the magnetic disc by way of the varnisher roller with a desired pressing force.
    Type: Grant
    Filed: August 31, 2000
    Date of Patent: October 1, 2002
    Assignee: Sony Corporation
    Inventors: Katsumi Takeyama, Kenichi Kano