Zoom lens system

Details Zoom lens system Zoom lens system

2007-07-17

2008-12-09

Martinez, Joseph (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S689000, C359S708000

Reexamination Certificate

active

07463425

ABSTRACT:
A zoom lens system is disclosed that includes a front first lens group including a first lens of divergent meniscus and a second lens of plano-convex; an intermediate second lens group including a third lens of plano-concave, a fourth lens of plano-concave, and a fifth lens of plano-convex; and a rear third lens group including a sixth lens of double-convex, a seventh lens of double-convex, an eighth lens of plano-concave, and a ninth lens of plano-concave. The sixth and ninth lenses are non-spherical lenses formed of a plastic material, and the zoom lens system satisfies the following conditions (a) 0.16<fw/f1<0.21 (b) −0.78<fw/f2<−0.64 (c) 0.70<fw/f3<0.75 (d) 0.47<log Z3/log Z<0.76.

REFERENCES:
patent: 5268793 (1993-12-01), Saka et al.
patent: 5424869 (1995-06-01), Nanjo
patent: 5543969 (1996-08-01), Ito
patent: 5627682 (1997-05-01), Nagaoka
patent: 2005/0243437 (2005-11-01), Hozumi et al.

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