| 摘要 |
PROBLEM TO BE SOLVED: To provide an imaging lens having a small F-number, high resolution and a sufficiently wide angle of view, and to reduce the size of an apparatus.SOLUTION: The imaging lens includes: a first meniscus lens L1 with a concave surface facing an object side; a second positive lens L2; a third negative meniscus lens L3 with a convex surface facing an image side; and a fourth negative lens L4. The first to fourth lenses are arranged in order from the object side. The imaging lens is configured such that a normal line Hof an object-side surface of the fourth lens L4 at a point where the outermost light beam 6 of an on-axis light flux 2 passes through the object-side surface, intersects the optical axis Z on the image side of the object-side surface. |
