| 摘要 |
An imaging lens comprises, 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; an aperture 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.
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