| 摘要 |
<p>An imaging lens comprising from object-to image-side: a positive first lens (G1) with a convex surface (R2) directed to the object side; a second lens (G2) having a negative meniscus shape with a concave surface (R5) directed to the image side; a third lens (G3) having a positive meniscus shape with a convex surface (R7) directed to the image side; a negative fourth lens (G4) with both surfaces being aspherical and the image-side surface (R9) being concave in the proximity of the optical axis (Z1); and a fifth lens (G5) with both surfaces being aspherical. The following conditional expressions are satisfied as for Abbe numbers vd1 and vd2 of the first and of the second lens and Abbe number vd4 of the fourth lens.</p> |
