Patent ID: 7742238
Filing Date: 2010-06-22
Classification: G02B

Abstract:
1. An imaging lens comprising, in order from an object side: a first lens having a positive refractive power and having a meniscus shape with a convex surface directed to the object side thereof; a second lens having a concave object-side surface; and a third lens that has a negative refractive power in a vicinity of an optical axis, wherein each of the second and third lenses has at least one aspheric surface, and the following conditional expressions are satisfied: where f denotes a focal length of the entire system, f1 denotes a focal length of the first lens, f2 denotes a focal length of the second lens, SA denotes the amount of sag of the object-side surface of the second lens in a position where a principal ray passes the maximum image height, Y denotes the maximum image height, and TL denotes a distance from an object-side surface of the first lens to an image formation position.