Patent ID: 8730594
Filing Date: 2014-05-20
Classification: G02B

Abstract:
1. An image pickup lens for a solid-state image pickup element, comprising, in order from an object side, a first lens having a positive refractive power with a convex surface facing the object side in the vicinity of an optical axis, a second lens of a biconcave lens shape facing concave surfaces to the object side and an image side in the vicinity of the optical axis, a third lens of a meniscus shape having a positive refractive power with a convex surface facing the image side in the vicinity of the optical axis, and a fourth lens of a biconcave lens shape facing concave surfaces to the object side and the image side in the vicinity of the optical axis, wherein the image pickup lens satisfies the following conditional expressions (1), (2), (4), (5), (7), and (8): where r r r r r r r r f: a composite focal length of an overall image pickup lens system; f f