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Endoscope objective lens system

  • US 7,379,252 B2
  • Filed: 03/27/2006
  • Issued: 05/27/2008
  • Est. Priority Date: 03/30/2005
  • Status: Expired due to Fees
First Claim
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1. A fixed focal length endoscope objective lens system comprising a negative front lens group, a diaphragm, and a positive rear lens group, in this order from an object;

  • wherein said negative front lens group comprises one lens element, or a plurality of non-cemented lens elements;

    wherein the most object-side lens element of said negative front lens group is a negative lens element;

    wherein said positive rear lens group comprises a plurality of non-cemented lens elements;

    wherein at least one negative lens element is provided in said positive rear lens group;

    wherein said endoscope objective lens system satisfies the following conditions;




    1.45<

    f
    1/f<



    0.6
    0.7<

    |f
    F/fR|<

    1.35


    2.3<

    f
    (−

    )
    /f<



    1.5whereinf1 designates the focal length of the most object-side negative lens element of said negative front lens group;

    f designates the focal length of the entire endoscope objective lens system;

    fF designates the focal length of said negative front lens group with (fF<

    0);

    fR designates the focal length of said positive rear lens group with (fR>

    0); and

    f(−

    )
    designates the focal length of said negative lens element of said positive rear lens group.

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