| 摘要 |
An image pickup lens for a solid-state image pickup element includes a first lens having a positive refractive power with a convex surface facing the object side, a second lens with concave surfaces facing the object side and an image side, a third lens of a meniscus shape having a positive refractive power with a convex surface facing the image side, and a fourth lens with concave surfaces facing the object side and the image side, wherein the image pickup lens satisfies the following conditional expressions (1),(2),(5),and(7);−1.3<r1/r2<0.03 (1) 0.09<r6/r5<1.0 (2)−0.16270≰r8/r7≰−0.0049871 (5) 0.38659694≰f3/f≰0.565293 (7) where r1, r2: curvature radius of the first lens; r5, r6: curvature radius of the third lens; r7, r8: curvature radius of the fourth lens; f: composite focal length of an overall image pickup lens system; and f3: focal length of the third lens. |
