| 摘要 |
Disclosed is an imaging lens that has a wide angle of view, a small size in the diametric direction of a lens system, and a good optical performance. An imaging lens includes a first negative lens having a meniscus shape in which a concave surface faces an image side, a second negative lens having a meniscus shape in which a concave surface faces the image side and including at least one aspheric surface, a third positive lens including at least one aspheric surface, an aperture diaphragm, and a fourth positive lens including at least one aspheric surface, which are arranged in this order from an object side. The imaging lens satisfies the following Conditional expression 1: f2/f<−4.5, where f indicates the focal length of the entire system and f2 indicates the focal length of the second lens. |
