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US 6,297,915 B1Granted
Image pickup lens
AssigneeEnplas Corporation
InventorsIsamu Kaneko, Tomohiro Saito
Life of this patent
Estimating the term…
Abstract
In a biconvex lens 1, at least one of faces thereof is formed into an aspherical shape, so that the radius of curvature of the second face of the lens 1 is equal to or larger than 0.65 times the focal length, and the radius of curvature of the first face is over 3 times the radius of curvature of the second face. Thus, the lens can be produced easily at a small size and a light weight.
Claims2
An image pickup lens which is a biconvex lens, at least one of faces of which is formed into an aspherical shape, so that the following conditions (1) and (2) are satisfied:
- (1) |R2|/f≧0.65
- (2) |R1|>3 |R2|
- wherein R1 is a radius of curvature of the face of the lens on the side of an object;
- R2 is a radius of curvature of the face on the side of an image pickup element board;
- and f is a focal length of said single lens.
2 more elements
Dependencies are inferred from the claim text.