Zoom lens system

Details Zoom lens system Zoom lens system

2007-08-07

2007-08-07

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S715000, C359S740000, C359S774000

Reexamination Certificate

active

11224928

ABSTRACT:
An object is to provide a zoom lens system having compactness, a high zoom ratio, and high optical performance with preferably correcting various aberrations. The zoom lens system includes, in order from the object, a first lens group G1having positive refractive power, a second lens group G2having negative refractive power, a third lens group G3having positive refractive power, and a fourth lens group G4having positive refractive power. When a state of lens group positions varies from a wide-angle end state to a telephoto end state, a distance between the first lens group G1and the second lens group G2increases, a distance between the second lens group G2and the third lens group G3decreases, a distance between the third lens group G3and the fourth lens group G4varies, and the fourth lens group G4moves along a zoom trajectory having a convex shape facing to an image.

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patent: 5638216 (1997-06-01), Horiuchi et al.
patent: 5739961 (1998-04-01), Nakayama et al.
patent: 5754346 (1998-05-01), Nakayama et al.
patent: 5784205 (1998-07-01), Nakayama et al.
patent: 2003-241092 (2003-08-01), None

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