Patent ID: 9223062
Filing Date: 2015-12-29
Classification: G02B

Abstract:
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: where f1: focal length of the first lens f3: focal length of the third lens f12: composite focal length of the first lens and the second lens f34: composite focal length of the third lens and the fourth lens r1: curvature radius of the object-side surface of the first lens r2: curvature radius of the image-side surface of the first lens.