| 摘要 |
<p>[Aim] To achieve a small size, a low cost, a sufficiently wide angle of view, excellent correction of a lateral chromatic aberration, appropriateness for use in combination with an imaging device, and high optical performance in an imaging lens. [Solution Means] An imaging lens (1) includes negative first lens (L1) having a concave image-side surface, positive second lens (L2) having a convex object-side surface in a paraxial region, an aperture stop, and positive third lens (L3) having a convex image-side surface in the paraxial region, which are arranged in this order from an object side. The Abbe numbers of materials constituting the first lens (L1) and the third lens (L3) for d-line are greater than or equal to 40. The Abbe number of a material constituting the second lens (L2) for d-line is less than or equal to 40. When the focal length of an entire system is f, and the center thickness of the second lens (L2) is D3, and the focal length of the first lens (L1) is f1, the following formulas (1) and (2) are satisfied: 1.4 < D �¢ 3 / f < 2.9 and - 5.0 < f �¢ 1 / f < - 1.8</p> |
