Patent ID: 7595938

Claim:
A wide-angle imaging lens comprising, in order from an object side: a first lens group having a positive refractive power; an aperture stop; and a second lens group having a positive refractive power, wherein: the first lens group comprises, in order from the object side, a first lens that is a negative meniscus lens having a convex surface directed to the object side, a negative second lens whose surface on an image side has a concave shape, and a positive third lens whose surface on the image side has a convex shape directed to the image side, and the second lens group comprises a positive fourth lens whose surface on the image side has a convex shape directed to the image side, a negative fifth lens having a biconcave shape, and a positive sixth lens, and the following Conditional Expressions (1) to (5) are satisfied: −4.0< f 2/ f<− 2.0 (1) 3.5< f 3/ f< 6.0 (2) −2.5< f 5/ f<− 1.5 (3) 3.0< fb/f< 5.0 (4) −3.0< f 12/ f<− 1.2 (5) where f denotes a focal length of the wide-angle imaging lens, f 2 denotes a focal length of the second lens, f 3 denotes a focal length of the third lens, f 5 denotes a focal length of the fifth lens, fb denotes a composite focal length of the second lens group, and f 12 denotes a composite focal length of the first lens and the second lens.