Patents Assigned to Ricoh Col, Ltd.
  • Camera lens system with long back focal distance and large aperture ratio
    Patent number: 4443070
    Abstract: A camera lens system is disclosed having a long back focal distance and a large aperture ratio. This enables the camera system to sufficiently correct for various aberrations including the spherical aberration of colors of the camera lens system.
    Type: Grant
    Filed: December 8, 1981
    Date of Patent: April 17, 1984
    Assignee: Ricoh Col, Ltd.
    Inventor: Yoshisato Fujioka