IMAGING LENS

摘要

A compact, wide view-field imaging lens with a small F-value which corrects aberrations properly. Its elements are arranged in order from an object side to an image side: an aperture stop, positive first lens having convex surfaces on the object and image sides, negative second lens having a concave object-side surface near an optical axis, positive meniscus third lens having a convex image-side surface, and negative meniscus double-sided aspheric fourth lens having a concave image-side surface near the optical axis. Its F-value is smaller than 2.4 and it satisfies conditional expressions (1) to (3) below:;0.15

主权项

1. An imaging lens for a solid-state image sensor in which elements are arranged in order from an object side to an image side, comprising:
an aperture stop; a first lens with positive refractive power having a convex surface on each of the object side and the image side; a second lens with negative refractive power having a concave surface on the object side near an optical axis; a third lens with positive refractive power as a meniscus lens having a convex surface on the image side; and a fourth lens with negative refractive power as a meniscus double-sided aspheric lens having a concave surface on the image side near the optical axis, wherein an F-value is smaller than 2.4; and conditional expressions (1) to (3) below are satisfied:
0.15