Wide-angle lens system and image-taking device
First Claim
1. A wide-angle lens system consisting essentially of, from an object side thereof:
- a first lens element having a negative optical power and having a meniscus shape convex to the object side;
a second lens element having a biconcave shape;
a third lens element having a biconvex shape; and
a fourth lens element having a positive optical power and having a meniscus shape convex to an image side.
1 Assignment
0 Petitions
Accused Products
Abstract
A wide-angle lens system has, from the object side thereof: a first lens element having a negative optical power and having a meniscus shape convex to the object side; a second lens element having a biconcave shape; a third lens element having a biconvex shape; and a fourth lens element having a negative optical power and having a meniscus shape convex to the image side. Alternatively, a wide-angle lens system has, from the object side thereof: a first lens element having a negative optical power; a second lens element having a negative optical power; a third lens element having a positive optical power; and a fourth lens element having a positive optical power.
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Citations
9 Claims
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1. A wide-angle lens system consisting essentially of, from an object side thereof:
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a first lens element having a negative optical power and having a meniscus shape convex to the object side; a second lens element having a biconcave shape; a third lens element having a biconvex shape; and a fourth lens element having a positive optical power and having a meniscus shape convex to an image side. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification