| 摘要 |
An image pickup lens includes a first lens with positive refractive power having a convex object-side surface, a second lens with negative refractive power, a third meniscus lens having a concave image-side surface, a fourth meniscus lens having a convex image-side surface, and a fifth lens with negative refractive power as a double-sided aspheric lens having a concave object-side and image-side surfaces near an optical axis; wherein following conditional expressions (9) and (12) are satisfied; 1.0<|(r3+r4)/(r3−r4)|<1.3  (9) −1.1<f2/f<−0.7  (12) where r3 represents a curvature radius of an object-side surface of the second lens, r4 represents a curvature radius of an image-side surface of the second lens, f represents a focal length of an overall optical system of the image pickup lens, and f2 represents a focal length of the second lens. |
