compact telephoto lens with three einzellinsen

摘要

PROBLEM TO BE SOLVED: To provide an imaging lens for providing high imaging performance with a more compact configuration.;SOLUTION: The imaging lens is equipped with: a first lens G1 having a convex surface facing an object side on a paraxial axis and having a positive power; a diaphragm St placed between the top position T of a surface S1 and the edge position E of the surface S1; a second lens G2 having a meniscus shape with a concave surface facing the object side on the paraxial axis and having a negative power; and a third lens G3 having a meniscus shape with a convex surface facing the object side on the optical axis. Further, the imaging lens satisfies all of a conditional expression (1) to regulate the power of the first lens, a conditional expression (2) to regulate the shape of the surface S1, and a conditional expression (3) to regulate the power of the second lens G2. Thus, the imaging performance is improved, and entire length is shortened while achieving both the securement of telecentricity and the moderation of sensitivity for misalignment among the first lens to the third lens.;COPYRIGHT: (C)2008,JPO&INPIT