Patent ID: 8189271

Claim:
An imaging lens comprising: a first lens having negative power, and which is a meniscus lens the image-side surface of which has concave shape; a second lens, the object-side surface and the image-side surface of which are aspheric, and which has double concave shape in the vicinity of an optical axis; a third lens, the object-side surface and the image-side surface of which are aspheric, and which has double convex shape in the vicinity of the optical axis; a stop; and a fourth lens, the object-side surface and the image-side surface of which are aspheric, and which has double convex shape in the vicinity of the optical axis, and the first lens, the second lens, the third lens, the stop and the fourth lens being arranged from the object side of the imaging lens in the order mentioned above, wherein the following formula (1) is satisfied: 0.0< r 5/ r 4<1.0 (1), where r4 is a paraxial radius of curvature of the image-side surface of the second lens, and r5 is a paraxial radius of curvature of the object-side surface of the third lens.