Patent ID: 7639432
Filing Date: 2009-12-29
Classification: G02B

Abstract:
1. An imaging lens comprising, in order from an object side: a first lens having a negative refractive power with a concave surface directed to an image side thereof; a second lens having a positive refractive power with a convex surface directed to an image side thereof and having an absolute value of a radius of curvature on the image side is equal to or smaller than that on an object side thereof; a stop; a third lens which is a planoconvex lens having a plane on an object side thereof or a double-convex lens having on an object side thereof a surface of which an absolute value of a radius of curvature is larger than that on an image side thereof; and a compound lens of a fourth lens and a fifth lens, the compound lens having a positive composite power, wherein the second lens is a double-convex lens, and the number of lenses of the imaging lense is five.