Photographic lens

Photographic lens

  • CN 102,540,425 A
  • Filed: 12/31/2011
  • Published: 07/04/2012
  • Est. Priority Date: 02/07/2011
  • Status: Active Application
First Claim
Patent Images

1. imaging lens system;

  • It is characterized in that;

    It is according to having from the side arranged in order from the close-by examples to those far off that is taken;

    aperture diaphragm (S1);

    First lens (L1) of the positive light coke of biconvex shape;

    Convex surface is towards second lens (L2) of the negative power of the meniscus shape on the side that is taken;

    Convex surface is towards the 3rd lens (L3) of the positive light coke of the meniscus shape of image planes side;

    Convex surface is towards the 4th lens (L4) of the negative power of the meniscus shape on the side that is taken;

    And conditional (1)~

    (5) below satisfying;

    Promptly0.50≤

    f1/f≤

    0.75 (1)5.20≤

    f/d1≤

    8.00 (2)12.00≤

    f/d6≤

    45.00 (3)-0.35≤

    R1/R2≤

    -0.20 (4)3.00≤

    R3/R4≤

    20.00 (5)Wherein,F representes the focal length that lens combination is whole,F1 representes the focal length of first lens,D1 representes the center thickness of first lens,D6 representes from the distance of the body side surface that is taken of image planes side to the four lens of the 3rd lens,R1 representes the be taken radius-of-curvature of body side surface of first lens,R2 representes the radius-of-curvature of the first lens image planes side,R3 representes the be taken radius-of-curvature of body side surface of second lens,R4 representes the radius-of-curvature of the second lens image planes side.

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