| 摘要 |
<P>PROBLEM TO BE SOLVED: To achieve high imaging performance in the range from the central angle of view to the peripheral angle of view, while reducing the entire length, and satisfactorily correcting chromatic aberrations, in particular, with respect to an axis and magnification. <P>SOLUTION: The imaging lens includes in order from the object side: a first lens L1 which has positive power and a convex face on the object side; a second lens L2 which has negative power near the optical axis and a concave face on the image side near the optical axis;a third lens L3 which has positive power near the optical axis and a convex face on the image side near the optical axis ; a fourth lens L which has a concave face on the image side at the optical axis and a convex face on the image side at its periphery; and a fifth lens L5 which has positive power near the optical axis. The imaging lens satisfies the following conditional formulae (1) and (2): ν2≤30 and 40≤ν3, wherein ν2 represents the Abbe's number of the second lens and ν3 represents the Abbe's number of the third lens. <P>COPYRIGHT: (C)2010,JPO&INPIT |
