IMAGING LENS

摘要

An exemplary embodiment of the present invention relates to an imaging lens, the imaging lens including, in an ordered way from an object side, a first lens having positive (+) refractive power, a second lens having negative (−) refractive power, a third lens having positive (+) refractive power, a fourth lens having negative (−) refractive power, wherein the imaging lens meets a conditional expression of D4−D3≦0, where D3 is a distance from an apex of an object side surface of the third lens to an apex of an image side surface of the third lens, and D4 is an axial distance from the apex of an object side surface of the third lens to an effective diameter of an object side surface of the fourth lens.

主权项

1. An imaging lens comprising, in an ordered way from an object side to an image side:
a first lens having positive (+) refractive power and a convex surface on the object side thereof; a second lens having negative (−) refractive power; a third lens having positive (+) refractive power in a meniscus shape and a convex surface on an image side thereof; and a fourth lens having negative (−) refractive power in a meniscus shape and a concave surface on an image side thereof wherein the imaging lens satisfies formulae (1) to (2):
|R3|>|R7|  (1)R4>|R7|  (2) where, R3 represents a radius of curvature in an optical axis for the third lens to an object side surface, R7 represents a radius of curvature in an optical axis for the third lens to an image side surface, and R4 represents a radius of curvature in an optical axis for the fourth lens to an object side surface.