Patents by Inventor Takao Chikazawa

Takao Chikazawa 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).

  • Patent number: 6927941
    Abstract: A disk storage medium and a disk drive which reduce friction during landing of the head/slider is described. The minimum fly height area of the head/slider is positioned over a texture free portion of the landing zone on the disk surface landing. In a preferred embodiment, the landing zone of a magnetic disk is a laser texture zone comprising a great number of bumps and is positioned during landing adjacent an area other than the minimum fly height area of the head/slider. The area facing the minimum fly height area of a head/slider has no bumps, i.e. is a bump free zone.
    Type: Grant
    Filed: March 27, 1998
    Date of Patent: August 9, 2005
    Assignee: Hitachi Global Storage Technologies Netherlands BV
    Inventors: Hidetsugu Tanaka, Yoshio Yamamoto, Yoshinao Harada, Takao Chikazawa
  • Patent number: 5313352
    Abstract: In the slider 1 on which a transducer 5 is mounted and which moves above a recording surface 4, in order to generate different vibration modes according to various situations such as vertical lift-off and landing, and breaking away from stiction, etc. A plurality of piezo-electric elements 8A, 8B, 8C, and 8D are disposed on the slider 1 and means for supplying a different AC voltage to each of the piezo-electric elements 8A, 8B, 8C, and 8D is provided.
    Type: Grant
    Filed: September 11, 1992
    Date of Patent: May 17, 1994
    Assignee: International Business Machines Corporation
    Inventors: Takao Chikazawa, Akihiko Aoyagi, Atsushi Tobari