Antivibration zoom lens

Details Antivibration zoom lens Antivibration zoom lens

1999-03-10

2000-10-31

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359687, 359554, 359557, G02B 1514

Patent

active

061411566

ABSTRACT:
An antivibration zoom lens (10) for photography, video and the like. The zoom lens has an antivibration function and is capable of forming an image of an object over a zooming range from a maximum wide-angle state to a maximum telephoto state. The zoom lens comprises, objectwise to imagewise along an optical axis (A), a first lens group (G1) having a focal length f1 and positive refractive power. A second lens group (G2) is arranged adjacent the first lens group and serves as the antivibration lens group. The second lens group has a focal length f2, negative refractive power and comprises at least three lens sub-groups (G2A-G2C). One of the at least three lens sub-groups has a focal length t2B and is movable substantially perpendicularly to the optical axis. The zoom lens further comprises at least a third lens group (G3) and fourth lens group (G4). All the lens groups are separated by respective spacings which change when zooming from the maximum wide-angle state to the maximum telephoto state. In addition, the zoom lens preferably satisfies at least one of a number of design conditions.

REFERENCES:
patent: 5040881 (1991-08-01), Tsuji
patent: 5270857 (1993-12-01), Oizumi et al.
patent: 5502594 (1996-03-01), Suzuki et al.
patent: 5654826 (1997-08-01), Suzuki
patent: 5748383 (1998-05-01), Ohtake
patent: 5798871 (1998-08-01), Shibayama et al.
patent: 5963378 (1999-10-01), Tochigi et al.

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