Zoom lens system and image pickup apparatus including the same

Zoom lens system and image pickup apparatus including the same

  • CN 101,311,768 B
  • Filed: 01/06/2006
  • Issued: 08/14/2013
  • Est. Priority Date: 01/06/2005
  • Status: Active Grant
First Claim
Patent Images

1. zoom-lens system comprises:

  • At zoom with a plurality of lens units of being separated from each other of the interval that changes during focusing on one of them, these a plurality of lens units comprise removable lens unit, are used for the image that is formed by zoom-lens system at the plane internal shift perpendicular to optical axis by at least;

    AndAperture diaphragm,Wherein, this removable lens unit comprises the first lens subelement with positive refractive power and the second lens subelement with negative refractive power that is positioned at the image-side of aperture diaphragm of the object space side that is positioned at aperture diaphragm,Wherein, when at the image that is formed by zoom-lens system perpendicular to the plane internal shift of optical axis, aperture diaphragm mobile and on the direction of the component that comprises the direction that is orthogonal to optical axis the integrally mobile first lens subelement and the second lens subelement,Wherein, satisfy following conditional expression,0.05<

    Dab/fp<

    0.77Wherein fp represents the focal length of removable lens unit, and Dab represents the interval between the first lens subelement and the second lens subelement, andDescribed zoom-lens system also comprises and being positioned at than the second lens subelement more near the lens component of image-side, wherein, satisfies following conditional expression,-0.31<

    φ

    Rt/φ

    P<

    3.1,

    Wherein φ

    Rt is illustrated in the refracting power of taking the photograph the far-end lens component, and φ

    P represents the refracting power of removable lens unit.

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