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Zoom lens system

  • US 6,185,048 B1
  • Filed: 10/14/1998
  • Issued: 02/06/2001
  • Est. Priority Date: 10/14/1997
  • Status: Expired
First Claim
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1. A zoom lens system comprising in order from an object side of said system:

  • a first lens group having positive refracting power, a second lens group that has negative refracting power and moves from an object side to an image plane side of said system during zooming from a wide-angle end to a telephoto end of said system, a third lens group having positive refracting power, and a fourth lens group that has positive refracting power and is movable during zooming, wherein;

    said first lens group consists of two lenses, a negative lens and a positive lens, or one positive lens alone, said third lens group comprises three lenses, a positive lens, a positive lens and a negative lens, or two lenses, a positive lens and a negative lens, and said third lens group has at least one aspherical surface therein.

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