Patents by Inventor Ryotaro Naka

Ryotaro Naka 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: 8091048
    Abstract: The contour shape of an aerial image formed on a resist by projecting a test pattern onto the resist via a projection optical system is computed. The shape of a resist pattern formed by the exposure using the test pattern and the development process is measured. A correction model indicating the relationship between the amount of characteristic of the contour shape and the amount of correction determined in accordance with the difference between the computed contour shape and the measured shape of the resist pattern is created. The contour shape of an aerial image formed on a resist by projecting an arbitrary pattern onto the resist via the projection optical system is computed. The shape of a resist pattern corresponding to the arbitrary pattern is predicted by correcting the computed contour shape of the aerial image, using the amount of correction given by the correction model in correspondence with the amount of characteristic of the contour shape.
    Type: Grant
    Filed: February 26, 2008
    Date of Patent: January 3, 2012
    Assignee: Canon Kabushiki Kaisha
    Inventor: Ryotaro Naka
  • Publication number: 20080209386
    Abstract: The contour shape of an aerial image formed on a resist by projecting a test pattern onto the resist via a projection optical system is computed. The shape of a resist pattern formed by the exposure using the test pattern and the development process is measured. A correction model indicating the relationship between the amount of characteristic of the contour shape and the amount of correction determined in accordance with the difference between the computed contour shape and the measured shape of the resist pattern is created. The contour shape of an aerial image formed on a resist by projecting an arbitrary pattern onto the resist via the projection optical system is computed. The shape of a resist pattern corresponding to the arbitrary pattern is predicted by correcting the computed contour shape of the aerial image, using the amount of correction given by the correction model in correspondence with the amount of characteristic of the contour shape.
    Type: Application
    Filed: February 26, 2008
    Publication date: August 28, 2008
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Ryotaro Naka