Zoom lens system

Details Zoom lens system Zoom lens system

2006-11-07

2006-11-07

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S689000

Reexamination Certificate

active

07133213

ABSTRACT:
An object is to provide a zoom lens system with a high zoom ratio capable of preferably correcting aberrations with securing sufficient amount of back focal length by well-suited power arrangement. The zoom lens system includes, in order from an object, a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, a fourth lens group having negative refractive power, and a fifth lens group having positive refractive power. When zooming from a wide-angle end state to a telephoto end state, a distance between the first and the second lens groups increases, a distance between the second and the third lens groups decreases, a distance between the third and the fourth lens groups increases and a distance between the fourth and the fifth lens groups decreases. A given conditional expression is satisfied.

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patent: 8-179213 (1996-07-01), None
patent: 9-304697 (1997-11-01), None

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