Zoom lens and camera with zoom lens

Zoom lens and camera with zoom lens

  • CN 101,021,609 A
  • Filed: 02/13/2007
  • Published: 08/22/2007
  • Est. Priority Date: 02/13/2006
  • Status: Active Grant
First Claim
Patent Images

1. , a kind of zoom lens is characterized in that,From object side, the 1st lens combination that has negative refracting power in turn by integral body, integral body has the 2nd lens combination of positive refracting power, and whole the 3rd lens combination with negative refracting power constitutes, about becoming doubly, by the position of described the 1st lens combination and described the 2nd lens combination is moved along optical axis direction, perhaps by except moving described the 1st lens combination and described the 2nd lens combination, also moving described the 3rd lens combination, and finish, the optical power that is had about described the 1st lens combination, satisfy following conditional (1), size about the lens total system satisfies following conditional (2), in addition, the optical power that is had about described the 3rd lens combination satisfies following conditional (3):

  • (1)-0.8≤

    f w/f I

    -0.45 (2)4.5≤

    TL w/f w

    7.5 (3)-0.55≤

    f w/f III

    0 Wherein;

    f w;

    the system-wide synthetic focal length of the lens in the wide-angle side;

    f I;

    the synthetic focal length of the 1st lens combination;

    f III;

    the synthetic focal length of the 3rd lens combination;

    TL w;

    the object side of the 1st lens of the 1st lens combination from constitute wide-angle side is to the distance (wherein, the parallel plane glass part is the air scaled distance) of image planes.

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