Patents Examined by Leo Boutskaris
  • Optical element and optical system having the same
    Patent number: 6351333
    Abstract: An optical element includes an incidence surface, one or more reflecting surfaces reflecting light from the incident surface, an emergence surface, and off-axial curved surfaces causing the light to emerge from the emergence surface. At least one of the incidence surface, the emergence surface and the one or more reflecting surfaces is a surface having diffracting action. The surface having the diffracting action is a curved surface.
    Type: Grant
    Filed: September 14, 1998
    Date of Patent: February 26, 2002
    Assignee: Canon Kabushiki Kaisha
    Inventors: Keisuke Araki, Sadahiko Tsuji, Tsunefumi Tanaka, Kenichi Kimura, Norihiro Nanba, Hiroshi Saruwatari, Michiharu Aratani, Takeshi Akiyama