Zoom lens and video camera using it

Zoom lens and video camera using it

  • CN 1,596,376 A
  • Filed: 11/22/2002
  • Published: 03/16/2005
  • Est. Priority Date: 11/28/2001
  • Status: Active Application
First Claim
Patent Images

1. , a kind of lens of variable focal length has:

  • The 1st lens combination, comprise dispose successively to the image planes side from object side, have negative dioptric lens and have positive dioptric lens and engage the joint lens that form and have positive dioptric lens, have positive diopter on the whole, and be fixed with respect to image planes;

    The 2nd lens combination has negative diopter on the whole, by moving on optical axis, realizes becoming doubly effect;

    Aperture is fixed with respect to above-mentioned image planes;

    The 3rd lens combination, by dispose successively to the image planes side from object side, have positive dioptric lens and have negative dioptric lens and constitute, have positive diopter on the whole, fix with respect to optical axis direction when becoming times and during focusing;

    The 4th lens combination, by dispose successively to the image planes side from object side, have negative dioptric lens and have positive dioptric lens and constitute, have negative diopter on the whole, be fixed with respect to above-mentioned image planes;

    AndThe 5th lens combination, it has positive diopter on the whole, and moves on optical axis, makes along with above-mentioned the 2nd lens combination remains on the position of reference field in the above-mentioned image planes that change with moving of object that move on the optical axis, it is characterized in that;

    Above-mentioned the 2nd lens combination is made up of following 4 lens, the lens that engage of that promptly dispose successively to the image planes side from object side, negative meniscus, biconcave lens, convex lens and concavees lens;

    Above-mentioned the 3rd lens combination, the change of the image during for correction of jitter can be moved on the direction vertical with respect to optical axis;

    Above-mentioned the 4th lens combination is made of with the lens that engage of convex lens concavees lens;

    Above-mentioned the 5th lens combination by biconvex lens and biconcave lens engage lens and convex lens totally 3 lens constitute;

    When the object side power of a lens of the joint lens of establishing above-mentioned the 1st lens combination is φ

    11, above-mentioned the 1st lens combination the image planes side power of a lens of joint lens be φ

    12, above-mentioned the 1st lens combination the abbe number of object side lens of joint lens be υ

    D11, above-mentioned the 1st lens combination the abbe number of image planes side lens of joint lens be υ

    D12The time, above-mentioned the 1st lens combination satisfies the conditional of following formula 1. Formula 1;

    -75<

    ν

    d11ν

    d12

    11

    12)/(φ

    11ν

    d12

    12ν

    d11)<

    -50

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