Wide-angle zoom lens system

Details Wide-angle zoom lens system Wide-angle zoom lens system

2006-09-12

2006-09-12

Spector, David N. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S685000, C359S680000

Reexamination Certificate

active

07106520

ABSTRACT:
A wide-angle zoom lens system includes a negative first lens group, a positive second lens group, a negative third lens group, and a positive fourth lens group. Upon zooming from the short focal length extremity to the long focal length extremity, the distance between the negative first lens group and the positive second lens group decreases, the distance between the positive second lens group and the negative third lens group increases, and the distance between the negative third lens group and the positive fourth lens group decreases; and the positive second lens group, the negative third lens group and the positive fourth lens group move toward the object. The wide-angle zoom lens system satisfies the following conditions:in-line-formulae description="In-line Formulae" end="lead"?1.2<|f(i=1)/fW|<2.0  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?1.5<f(i=2)/fW<2.2  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?2.5<|f(i=3)/fW|<3.6  (3)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?3.2<f(i=4)/fW<4.7;  (4)in-line-formulae description="In-line Formulae" end="tail"?whereinfi designates the focal length (f1<0, f3<0) of the ithlens group (i=1˜4); andfWdesignates the focal length of the entire the wide-angle zoom lens system at the short focal length extremity.

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