Patents by Inventor Klaus D. Schaefer

Klaus D. Schaefer 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).

  • Device for correctively compensating the aperture error in reproducing systems
    Patent number: 4482220
    Abstract: Device for the corrective compensation of the altering aperture error formed by varying the aperture stop in reproducing systems of image recording apparatus, for instance photographic cameras.The reproducing system (2,3,4) comprises at least one optical member (3,22) affecting the aperture error and displaceably supported along the optical axis (23) of the reproducing system (2,3,4) for varying its relative position with respect to the other components (2,4) of the reproducing system. Setting means (17,28) are further provided which as a function of the variation in the aperture stop displace the optical member (3,22) by an extent corresponding to a corrective compensating nominal value along the optical axis (23) of the reproducing system (2,3,4).
    Type: Grant
    Filed: August 7, 1981
    Date of Patent: November 13, 1984
    Assignee: Ernst Leitz Wetzlar GmbH
    Inventor: Klaus D. Schaefer