Patents by Inventor Fumiaki Kumagai

Fumiaki Kumagai 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).

  • Optical element
    Patent number: 6616287
    Abstract: This invention has as its object to prevent deterioration of optical performance by suppressing the respective reflection surfaces from being decentered relative to each other in an optical element formed by placing a plurality of reflection surfaces having curvatures at neighboring positions. In order to achieve this object, an optical element according to this invention has a first reflection surface block formed by placing a plurality of reflection surfaces having curvatures at neighboring positions, and a second reflection surface block which faces the first reflection surface block, and is formed by placing one or more reflection surfaces at neighboring positions, and the first and second reflection surface blocks are formed by a metal mold.
    Type: Grant
    Filed: December 1, 1998
    Date of Patent: September 9, 2003
    Assignee: Canon Kabushiki Kaisha
    Inventors: Makoto Sekita, Fumiaki Kumagai
  • OPTICAL ELEMENT
    Publication number: 20020041453
    Abstract: This invention has as its object to prevent deterioration of optical performance by suppressing the respective reflection surfaces from being decentered relative to each other in an optical element formed by placing a plurality of reflection surfaces having curvatures at neighboring positions. In order to achieve this object, an optical element according to this invention has a first reflection surface block formed by placing a plurality of reflection surfaces having curvatures at neighboring positions, and a second reflection surface block which faces the first reflection surface block, and is formed by placing one or more reflection surfaces at neighboring positions, and the first and second reflection surface blocks are formed by a metal mold.
    Type: Application
    Filed: December 1, 1998
    Publication date: April 11, 2002
    Inventors: MAKOTO SEKITA, FUMIAKI KUMAGAI