| 摘要 |
<p> Provided is an image-capturing lens having a five-lens configuration and having a brightness such that the F value is F2.4 or less, aberrations in the image-capturing lens being satisfactorily corrected, despite the lens being small. The image-capturing lens (10) essentially comprises, in sequence from the object side: a first lens (L1) having a positive refractive power and having a convex surface facing the object side in the vicinity of the optical axis (AX); a second lens (L2) having a negative refractive power and having a meniscus shape in which a concave surface faces the object side in the vicinity of the optical axis (AX); a third lens (L3); a fourth lens (L4) having a positive refractive power; and a fifth lens (L5) having a negative refractive power and having a biconcave shape in the vicinity of the optical axis (AX). The image-capturing lens (10) satisfies the following conditional relationships (1) and (2): 0.55 < f1/f < 0.95…(1), 0.35 < d14/EPD < 0.55…(2) In the above relationships, f1 represents the focal distance of the first lens (L1), f represents the focal distance of the entire system of the image-capturing lens (10), d14 represents the distance on the optical axis (AX) from the object-side surface (S11) of the first lens (L1) and the image-side surface (S22) of the second lens (L2), and EPD represents the entrance pupil diameter of the entire system of the image-capturing lens (10).</p> |
