| 摘要 |
[Problem] To achieve a more compact, lower-cost, wider-angle, improved-performance imaging lens which further ensures back focus. [Solution] In order from the object side, this imaging lens (1) consists of a negative first lens (L1), a positive second lens (L2), a positive third lens (L3), a negative fourth lens (L4), a positive fifth lens (L5) and a positive sixth lens (L6). Defining the focal length of the first lens (L1) as f1, the focal length of the fourth lens (L4) as f4 and the focal length of the entire system as f, the following conditional expressions are satisfied. f1/f < -1.6 ... (1) -0.7 < f4/f ... (2) |
