Patents Assigned to Opcon Associates of Canada, Ltd.
  • Triplet with aspheric surfaces
    Patent number: 4109995
    Abstract: A three element lens comprising two outer positive meniscuses and a central negative meniscus with all three elements concave to the aperture stop between the negative meniscus and a positive element.
    Type: Grant
    Filed: June 3, 1976
    Date of Patent: August 29, 1978
    Assignee: Opcon Associates of Canada, Ltd.
    Inventor: Ellis I. Betensky
  • Loupe
    Patent number: 4094585
    Abstract: A magnifier or loupe of high magnifying power comprising a positive singlet followed by a cemented doublet in the overall form of a meniscus having bi-convex and bi-concave elements. The cemented surfaces, the outer surfaces of the doublet, or both may be made aspheric.
    Type: Grant
    Filed: September 17, 1976
    Date of Patent: June 13, 1978
    Assignee: Opcon Associates of Canada, Ltd.
    Inventor: Ellis I. Betensky