Optical lens system

  • US 8,508,860 B2
  • Filed: 11/22/2011
  • Issued: 08/13/2013
  • Est. Priority Date: 10/06/2010
  • Status: Active Grant
First Claim
Patent Images

1. An optical lens system comprising, in order from an object side to an image side:

  • a first lens element with positive refractive power having a convex object-side surface;

    a second lens element with negative refractive power;

    a third lens element with positive refractive power having a convex object-side surface and a convex image-side surface;

    a fourth lens element; and

    a fifth lens element having a convex object-side surface and a concave image-side surface, the object-side and image-side surfaces thereof being aspheric and at least one inflection point being formed on the image-side surface,wherein the optical lens system is further provided with a stop disposed between an object and the third lens element, and an electronic sensor disposed at an image plane for the image formation of the object;

    a focal length of the optical lens system is f;

    a focal length of the third lens element is f3;

    a distance on an optical axis between the stop and the electronic sensor is SL;

    a distance on the optical axis between the object-side surface of the first lens element and the electronic sensor is TTL; and

    they satisfy the following relations;


    0.00<

    f/f
    3<

    1.90, and
    0.7<

    SL/TTL<

    1.2.

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