Patents by Inventor Hisashi Ohde

Hisashi Ohde 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).

  • Relief type diffraction optical element, optical system comprising the same and mold for manufacturing the same
    Patent number: 6839174
    Abstract: A relief type diffraction optical element including a substrate made of an optical material, said substrate having formed on its surface a non-even width relief pattern which include a first zone group consisting of at least one zone whose cross sectional configuration is formed by a curvilinear portion which follows a phase shift function or at least two rectilinear portions which approximates the phase shift function, and a second zone group consisting of a plurality of zones each having a single rectilinear portion approximating the phase shift function.
    Type: Grant
    Filed: March 2, 1998
    Date of Patent: January 4, 2005
    Assignee: Olympus Corporation
    Inventors: Hisashi Ohde, Yasuhiro Kamihara