Zoom lens system

Details Zoom lens system Zoom lens system

2007-04-03

2007-04-03

Mack, Ricky (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S676000

Reexamination Certificate

active

11220647

ABSTRACT:
A zoom lens system includes, in order from an object, a first lens group having positive power, a second lens group having negative power, a third lens group having positive power, a fourth lens group having positive power, and a fifth lens group having positive power. Upon zooming from a wide-angle end state to a telephoto end state, the first and fifth lens groups moves with respect to the image plane, the second lens group moves at first to the image and then to the object, and the third and fourth lens groups move to the object such that a distance between the first and second lens groups increases, a distance between the second and third lens group decreases, a distance between the third and fourth lens groups decreases, and a distance between the fourth and fifth lens groups increases. Given conditional expressions are satisfied.

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