| 摘要 |
<p>An imaging lens (1) comprises, in order from an object side: a first lens (L1) that has a negative refractive power and is convex toward the object side; a second lens (L2) that has a positive refractive power and is a meniscus lens convex toward the object side; a stop (St); a third lens (L3) that has a positive refractive power and is convex toward an image side; and a cemented lens (LC) that has a positive refractive power as a whole and is formed by cementing a fourth lens (L4) and a fifth lens (L5), wherein assuming that an Abbe number of the second lens with respect to d-line is ½ 2 , a distance on an optical axis from a vertex of a surface of the first lens facing toward the object side to an image plane of the imaging lens is L, a focal length of the imaging lens is f, and a back focus of the imaging lens is Bf, the following conditional expressions (1) to (3) are satisfied: ½ 2 > 30 2.5 < L / f < 4.0 and 0.5 < Bf / f < 1.3</p> |
