Focus Or Variable Magnification Patents (Class 353/76)
  • Variable conjugate optical system
    Patent number: 3947188
    Abstract: An optical system for projecting an image of an object, operating between fixed object and image planes. Both the object conjugate and the image conjugate are variable to vary the magnification in the system. This is accomplished without moving the optical axis by means of a first roof mirror on the object side of the lens and a second roof mirror on the image side of the lens. These mirrors each fold the optical axis by 90.degree. and are movable along a locus at 45.degree. to the optical axis to change the object and image distances.
    Type: Grant
    Filed: November 11, 1974
    Date of Patent: March 30, 1976
    Assignee: Xerox Corporation
    Inventor: George R. Simpson