Astigmatism-reducing anamorphic lens assemblies
AssigneeAtlas Lens Co.
InventorsDuane Scott DEWALD, Dan KANES
Life of this patent
Estimating the term…
Abstract
Anamorphic lens assembly having first and second anamorphic lens components, each having an astigmatism at infinity focus that is greater than an astigmatism at close focus. As the anamorphic lens assembly transitions from infinity focus to close focus, the astigmatism decreases for both of the first and second anamorphic lens components, which allows for proper focusing at close focus (when the object is close to the lens assembly). The astigmatism of the first anamorphic lens component may be equal and opposite to the astigmatism of the second anamorphic lens component, such that the astigmatisms of the anamorphic lens components cancel out one another.
Claims21
1-20. (canceled)
An anamorphic lens assembly, comprising:
- a first anamorphic lens component comprising:
- a first cylindrical lens element;
- and
- a second cylindrical lens element, wherein the first anamorphic lens component has zero astigmatism at infinity focus;
- and
- a second anamorphic lens component comprising:
- a third cylindrical lens element;
- a fourth cylindrical lens element;
- and
- a fifth cylindrical lens element, wherein the fourth and fifth cylindrical lens elements have a combined nonzero astigmatism at infinity focus, the third cylindrical lens element has a nonzero astigmatism at infinity focus, and the astigmatism of the third cylindrical lens element at infinity focus is equal and opposite to the combined astigmatism of the fourth and fifth cylindrical lens elements at infinity focus, such that the second anamorphic lens component has zero astigmatism at infinity focus, and such that the anamorphic lens assembly has zero astigmatism at infinity focus.
An anamorphic lens assembly, comprising:
- a first anamorphic lens component comprising:
- a first cylindrical lens element;
- and
- a second cylindrical lens element, wherein the first anamorphic lens component has greater astigmatism at close focus than at infinity focus;
- and
- a second anamorphic lens component comprising:
- a third cylindrical lens element;
- a fourth cylindrical lens element;
- and
- a fifth cylindrical lens element, wherein the fourth and fifth cylindrical lens elements have a combined nonzero astigmatism at infinity focus, the third cylindrical lens element has a nonzero astigmatism at infinity focus, and the second anamorphic lens component has greater astigmatism at close focus than at infinity focus.
Dependencies are inferred from the claim text.