Imaging lens

摘要

An imaging lens includes, in order from an object side, a first positive lens having a convex object-side surface, a second negative lens having a concave image-side surface, a third positive double-sided aspheric lens, a fourth positive lens having a convex image-side surface, and a fifth negative double-sided aspheric lens having a concave image-side surface, wherein the fifth lens image-side surface has pole-change points off an optical axis; and conditional expressions below are satisfied:
0.80where f denotes focal length of the imaging lens overall optical system, f1, f3 and f4 denote focal lengths of the first, third and fourth lenses respectively, ih denotes maximum image height, and TTL denotes distance on the optical axis from the first lens object-side surface to the image plane.

主权项

1. An imaging lens which forms an image of an object on a solid-state image sensor, in which an F-value is 2.4 or less and elements are arranged in order from an object side to an image side, comprising:
a first lens with positive refractive power having a convex surface on the object side; a second lens with negative refractive power having a concave surface near an optical axis on the image side; a third lens with positive refractive power as a double-sided aspheric lens; a fourth lens with positive refractive power having a convex surface on the image side; and a fifth lens with negative refractive power as a double-sided aspheric lens having a concave surface on the image side, wherein the image-side surface of the fifth lens has pole-change points off the optical axis; and conditional expressions (1), (2), (3), (4) and (10) below are satisfied:
0.80