IMAGE PICKUP LENS, AN IMAGE PICKUP UNIT AND A PORTABLE TERMINAL WITH THE IMAGE PICKUP UNIT TO CORRECT ABERRATION EXCELLENTLY

摘要

PURPOSE: An image pickup lens, an image pickup unit and a portable terminal with the image pickup unit are provided to correct aberration excellently by minimizing total length of lenses. CONSTITUTION: The first lens(L1) has an original refractive power and a convex surface placed toward an object of an image pickup lens. An iris(S) is placed next to the first lens. The second lens(L2) has an original refractive power and a convex surface placed toward an upper surface of the image pickup lens. The third lens(L3) has a duplicate refractive power and a concave surface with a meniscus shape which is placed toward the upper surface of the image pickup lens. The following conditional formulas are satisfied in the image pickup lens, wherein f1 means the focal distance of the first lens, f means the focal distance of electric field in the image pickup lens, ¢§1, ¢§2 and ¢§3 mean the Abbe's numbers of the first, second and third lens, respectively. 0.8<f1/f<2.0, 20<{(¢§1+¢§2)/2}-¢§3<70.