Imaging lens

  • US 7,535,658 B2
  • Filed: 10/31/2007
  • Issued: 05/19/2009
  • Est. Priority Date: 09/29/2005
  • Status: Active Grant
First Claim
Patent Images

1. An imaging lens comprising:

  • in order from an object side of the imaging lens,a first lens having a convex surface on the object side and having a positive power;

    a second lens having a concave surface on the object side and having negative power;

    a third lens having positive power; and

    a fourth lens having a convex surface on the object side near a paraxial axis and having a meniscus shape,wherein the imaging lens has an air distance between the first lens and the second lens, and the imaging lens satisfies conditional expression (5);


    1.9<

    f
    3/f<

    20 



    (5)wherein f designates a total focal length; and

    f3 designates a focal length of the third lens, andwherein each of the second to fourth lenses is made of a resin material,the imaging lens further satisfying conditional expression (1);


    0.7<

    f
    1/f<

    1.1 



    (1)wherein f1 designates a focal length of the first lens.

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