Two element plastic zoom camera lens
AssigneeEastman Kodak Company
InventorsLee R. Estelle, Alan E. Lewis
Life of this patent
Estimating the term…
Abstract
A zoom camera lens for an inexpensive camera, for example, a single use camera, has two plastic elements including a positive element and a negative element and a stop. Each of the surfaces of each of the elements is concave to the stop. Preferably, the lens has a curved image plane.
Claims18
A zoom camera lens for forming an image of a scene at an image plane consisting of a plastic negative power element, a plastic positive power element and a stop, in which both elements are movable with respect to each other and the image to vary focal length without varying the position of the image, in which the positive element is positioned between the negative plastic element and the stop, each element has two surfaces which are concave to the stop and the lens complies with the following inequalities:
- 0.5<f.sub.W /f.sub.N <1.05;
- and
- 0.5<f.sub.P /f.sub.W <1.05
- where f.sub.W is the focal length of the lens at its wide angle position, f.sub.N and f.sub.P are the absolute values of the focal length of the negative element and of the positive element, respectively.
Dependencies are inferred from the claim text.