| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a downsized large-diameter imaging lens, having excellent optical characteristics corresponding to a high-count pixel imaging device. <P>SOLUTION: An imaging lens comprises, in order from an object side, a first lens having a positive refractive power, a meniscus-shaped second lens having a negative refractive power with a concave surface facing an image side, a third lens having a positive refractive power, a meniscus-shaped fourth lens having a positive refractive power with a concave surface facing the object side in vicinity of an optical axis, and a fifth lens having a negative refractive power in vicinity of the optical axis and a positive refractive power in a peripheral part, and satisfies the following conditional expression (1), conditional expression (2), and conditional expression(3): (1) ν<SB POS="POST">1</SB>-ν<SB POS="POST">2</SB>>35, (2) ν<SB POS="POST">3</SB>>50, and (3) ν<SB POS="POST">4</SB>>50. <P>COPYRIGHT: (C)2012,JPO&INPIT |
