Lens system and camera with the same system

Lens system and camera with the same system

  • CN 1,322,348 C
  • Filed: 08/13/2002
  • Issued: 06/20/2007
  • Est. Priority Date: 08/24/2001
  • Status: Active Grant
First Claim
Patent Images

1. lens combination, it is characterized in that:

  • this system is according to having following configuration from object side to the order as side;

    Negative dioptric first lens, these first lens are with the meniscus shape of convex surface towards object side,Positive dioptric second lens, these second lens are biconvex shapes,The 3rd lens of negative refractive index, the 3rd lens are concave-concave shapes,The 4th lens of positive refractive index,The 5th lens of positive refractive index, the 5th lens are biconvex shapes,At this, as the D that is spaced apart that establishes these first lens and these second lens 1,2, these second lens and the 3rd lens be spaced apart D 2,3, system-wide back focus is bf, when system-wide focal length is f, satisfies at least one in following three conditions;

    0.6<

    D 1,

    2
    /f<

    1.0 0.6<

    D 2,

    3
    /f<

    0.82 0.9<

    bf/f<

    1.1Wherein, the said lens system only comprises above-mentioned first lens, above-mentioned second lens, above-mentioned the 3rd lens, above-mentioned the 4th lens and above-mentioned the 5th lens.

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