Patents Assigned to Opcon Associates, Inc.
  • Zoom lens with short back focal length
    Patent number: 4936661
    Abstract: A two lens unit zoom lens of plus, minus configuration where the rear negative group provides the primary variator function and the positive first lens unit consists of a negative sub-unit and a positive sub-unit and where the sub-units may move differentially during zooming.
    Type: Grant
    Filed: December 22, 1988
    Date of Patent: June 26, 1990
    Assignee: Opcon Associates, Inc.
    Inventors: Ellis I. Betensky, Melvyn H. Kreitzer, Jacob Moskovich