Single focal point lens

Single focal point lens

  • CN 1,940,626 A
  • Filed: 09/26/2006
  • Published: 04/04/2007
  • Est. Priority Date: 09/29/2005
  • Status: Active Application
First Claim
Patent Images

1. unifocal lens is characterized in that possessing in turn from object side:

  • the 1st lens, and it is that the face with object side is the lens of the positive light coke of convex shape;

    The 2nd lens, it is that the face with object side is the diverging meniscus lens of concave on paraxial;

    With the 3rd lens, it is that the face with object side is the non-spherical lens of convex shape on paraxial, and described unifocal lens meets the following conditions;

    1.5>

    f1/f>

    0.6 (1)69<

    vdA (2)24<

    vdB<

    32 (3)1.55>

    NdA (4)1.65>

    NdB>

    1.48 (5)1.8>

    L/D (6)0.30<

    RA/f<

    0.40 (7)Wherein,F;

    whole focal lengthF1;

    the focal length of the 1st lensVdA;

    the Abbe number of the 1st lensVdB;

    the Abbe number of the 2nd lensNdA;

    the refractive index in the d line of the 1st lensNdB;

    the refractive index in the d line of the 2nd lensRA;

    paraxial curvature half warp of the face of the object side of the 1st lensL;

    the distance on the optical axis till from the face of the object side of the 1st lens to image spaceD;

    maximum image height.

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