Patents by Inventor Katsutoshi Usuda

Katsutoshi Usuda 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).

  • Method and device for inspecting defects on both surfaces of magnetic disk
    Patent number: 8294890
    Abstract: A device that is capable of simultaneously inspecting both sides of surfaces of a magnetic disk to detect defects thereon includes a front-side defect detecting section and a back-side defect detecting section each of which optically detect a scratch and a defect that are present on the front and back surfaces of the magnetic disk, to improve a throughput for inspection. The back-side defect detecting section has an optical path changing section that reflects a laser beam emitted by a laser light source to change an optical path thereof and thereby to direct the laser beam toward the back surface of the magnetic disk and that reflects scattered light that has been collected by a Fresnel lens to change an optical path thereof and thereby to direct the scattered light toward a first photoelectric converter.
    Type: Grant
    Filed: August 13, 2010
    Date of Patent: October 23, 2012
    Assignee: Hitachi High-Technologies Corporation
    Inventor: Katsutoshi Usuda
  • METHOD AND DEVICE FOR INSPECTING DEFECTS ON BOTH SURFACES OF MAGNETIC DISK
    Publication number: 20110075133
    Abstract: A device that is capable of simultaneously inspecting both sides of surfaces of a magnetic disk to detect defects thereon includes a front-side defect detecting section and a back-side defect detecting section each of which optically detect a scratch and a defect that are present on the front and back surfaces of the magnetic disk, to improve a throughput for inspection. The back-side defect detecting section has an optical path changing section that reflects a laser beam emitted by a laser light source to change an optical path thereof and thereby to direct the laser beam toward the back surface of the magnetic disk and that reflects scattered light that has been collected by a Fresnel lens to change an optical path thereof and thereby to direct the scattered light toward a first photoelectric converter.
    Type: Application
    Filed: August 13, 2010
    Publication date: March 31, 2011
    Applicant: HITACHI HIGH-TECHNOLOGIES CORPORATION
    Inventor: Katsutoshi USUDA