Back to results
US 4,050,788 AGranted
Basic lens for pancratic system
AssigneesKarl Vockenhuber, Raimund Hauser
InventorIrmgard Wendisch
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneesKarl Vockenhuber, Raimund Hauser
InventorIrmgard Wendisch
Estimating the term…
A basic lens for a pancratic camera lens system having an afocal screen of variable enlargement in which the screen includes a primary, positive front component, second and third negative components, the total focal length of the second negative component being displaceable of the optical axis and the minimum focal length of the second negative element and the image field diagonal 2.sub.y having a relationship (f.sub.Gmin - f.sub.II)<6y, and a fourth positive component, the basic lens being constructed in the form of an assembly of six lenses including, in succession beginning with the lens facing the object to be photographed, a first biconvex lens, a second biconvex lens, a first biconcave lens cemented to the second biconvex lens, a second biconcave lens, a third biconvex lens and a positive meniscus, all arranged in aligned relationship in the direction of light incidence.
A basic lens for a pancratic camera lens having an afocal screen of variable enlargement wherein the basic lens comprises a plurality of lenses including a first biconvex lens nearest the object to be photographed, a second biconvex lens, a first biconcave lens cemented to said second biconvex lens, a second biconcave lens, a third biconvex lens and a positive meniscus all arranged in an aligned relationship as viewed in the direction of the incident light, wherein the positively refracting surfaces (.PHI.21, .PHI.28) of said second biconvex lens cemented to said first biconcave lens and the positive meniscus, said positively refracting surfaces (.PHI.21, .PHI.28) convex to the incident light, the positively refracting surface (.PHI.27) of the third biconvex lens, said positively refracting surface (.PHI.27) convex to the picture, as well as the negatively refracting surface (.PHI.25) of said second biconcave lens, said negatively refracting surface (.PHI.25) concave to the picture, have the following values:
Dependencies are inferred from the claim text.