Zoom lens and image pickup apparatus using the same

Zoom lens and image pickup apparatus using the same

  • CN 101,726,842 B
  • Filed: 10/20/2009
  • Issued: 01/14/2015
  • Est. Priority Date: 10/23/2008
  • Status: Active Grant
First Claim
Patent Images

1. optical devices, these optical devices comprise the image pick-up element of the light of the image that zoom lens are formed by described zoom lens with reception, and described zoom lens comprise:

  • There is the first lens unit of negative refracting power;

    There is the second lens unit of positive refracting power;

    WithThere is the 3rd lens unit of positive refracting power,Described first lens unit, the second lens unit and the 3rd lens unit are arranged from the object side to image side successively,Wherein,Described first lens unit comprises negative lens and positive lens,Described 3rd lens unit comprises positive lens, and,Radius-of-curvature when the radius-of-curvature of the thing side surface of described negative lens and the surface, image side of described negative lens is defined as R11 and R12 respectively, and the radius-of-curvature on the surface, image side of the positive lens in the radius-of-curvature of the thing side surface of the positive lens in described first lens unit and described first lens unit is defined as R21 and R22 respectively, f1 represents the focal length of the first lens unit and f3 represents the focal length of the 3rd lens unit, the radius-of-curvature of the thing side surface of the described positive lens in described 3rd lens unit is defined as R31 and the radius-of-curvature on the surface, image side of described positive lens in described 3rd lens unit is defined as R32, and fw represent focal length in the whole system of wide-angle side and f2 represents the focal length of the second lens unit time, meet following conditional expression;

    -5.6<

    (R12+R21)/(R12-R21)<

    -4.71.5<

    (R11+R22)/(R11-R22)<

    2.3-0.55<

    f1/f3<

    -0.3-0.4<

    (R31+R32)/(R31-R32)<

    0.21.4<

    f2/fw<

    2.0,

    Little at the effective image circular diameter of telescope end at the effective image circular diameter ratio of wide-angle side.

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