Zoom lens system

Details Zoom lens system Zoom lens system

2005-05-10

2005-05-10

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S557000

Reexamination Certificate

active

06891680

ABSTRACT:
The object is to provide an afocal zoom lens system with the f-number of about 4 or less capable of performing vibration reduction correction. The system includes, in order from an object, a first group G1being positive, a second group G2being negative, a third group G3being positive, and a fourth group G4being positive. Zooming is performed by moving the second and third groups along the optical axis. The fourth group G4is composed of a front group G4F being positive, a middle group G4M being negative, and a rear group G4R being positive. Vibration reduction is performed by shifting the middle group G4M perpendicular to the optical axis. The first group G1consists of a first front group G1f being fixed, a first middle group G1m being movable, and a first rear group G1r being fixed. Focusing is performed by moving G1m along the optical axis.

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patent: 6560016 (2003-05-01), Usui et al.
patent: 6646804 (2003-11-01), Harada
patent: 6693750 (2004-02-01), Sato
patent: 20020101661 (2002-08-01), Harada
patent: 20030133200 (2003-07-01), Sato
patent: 10-90599 (1998-04-01), None
patent: 2002-162564 (2002-06-01), None

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