Patents by Inventor Yuuichi Tachikawa

Yuuichi Tachikawa 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).

  • Mastering machine having non-repetitive runout compensation
    Patent number: 5825730
    Abstract: A mastering machine comprises a turntable being capable of holding a master disk, a detector disposed in noncontact with the turntable for detecting repetitive runout amount of the turntable in the radial direction thereof, a non-repetitive runout amount calculator for calculating a non-repetitive runout amount in the radial direction of the turntable on the output of the detector, a projector for projecting an exposure beam to the master disk held by the turntable and a compensation unit for adjusting the position of the exposure beam projected to the master disk on the basis of a signal from the non-repetitive runout amount calculator.
    Type: Grant
    Filed: March 8, 1996
    Date of Patent: October 20, 1998
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Jun Nishida, Nobutaka Kikuiri, Yuuichi Tachikawa