Patents Assigned to AB Svensk Filmindustri
  • Multifocal objective
    Patent number: 4741605
    Abstract: The present invention relates to an image-forming objective which is capable of forming sharp images of objects at at least two different distances from the objective, there being arranged at one focal plane of the objective a corrective element divided into at least two fields in which the refractive power differs between them.
    Type: Grant
    Filed: November 29, 1984
    Date of Patent: May 3, 1988
    Assignees: AB Svensk Filmindustri, Svenska Ord AB
    Inventors: Hans Alfredsson, Bo Moller, Erik Ingelstam, Per-Olof Ohlsson, Georg Vogl