Zoom lens system

Details Zoom lens system Zoom lens system

2006-03-28

2008-05-06

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S680000

Reexamination Certificate

active

07369324

ABSTRACT:
Providing a compact zoom lens system with high optical performance suitable for an SLR digital camera with a solid-state imaging device of the APS-C size. The zoom lens system includes, in order from an object, a first group having negative power, a second group having positive power, a third group having negative power, and a fourth group having positive power. Upon zooming from a wide-angle end state to a telephoto end state, the second, third and fourth groups are moved to the object such that a distance between the first and second groups decreases, a distance between the second and third groups increases, and a distance between the third and fourth groups decreases. Each of the first, second and fourth groups is composed of at least one positive lens and at least one negative lens. The third group consists of a single lens. Given conditional expressions are satisfied.

REFERENCES:
patent: 5805350 (1998-09-01), Yamamoto
patent: 5805351 (1998-09-01), Hayashi
patent: 2004/0179245 (2004-09-01), Mihara
patent: 9-243917 (1997-09-01), None
patent: 10-111455 (1998-04-01), None
patent: 2004-1835585 (2001-07-01), None
patent: 2004-246141 (2004-09-01), None
patent: 2004-271937 (2004-09-01), None

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