Patent ID: 7180642

Claim:
An imaging lens comprising a first, a second, a third, and a fourth lens groups arranged in order from an object toward an image, the first lens group including a first lens that is a convex meniscus lens with a convex surface on the object side; the second lens group including a second lens having a positive refractive power, and a third lens bonded to the second lens and having a negative refractive power; the third lens group including a fourth lens having a negative refractive power, and a fifth lens bonded to the fourth lens and having a positive refractive power; and the fourth lens group including a sixth lens having a positive refractive power, the imaging lens satisfying the condition 0.10< D/f< 0.19 where D denotes a sum of an air gap between the first lens and the second lens and an air gap between the fifth lens and the sixth lens, and f denotes a focal length of the entirety of the imaging lens with respect to an e-ray.