Zoom lens system

Details Zoom lens system Zoom lens system

1998-04-20

2000-08-22

Mack, Ricky

Optical: systems and elements

Lens

With variable magnification

359676, G02B 1514

Patent

active

06108137&

ABSTRACT:
A zoom lens, especially, suitable for a stepped-zoom zoom lens system, which includes a zoom lens and a zoom lens barrel. The zoom lens barrel houses a zoom lens possessing a plurality of movable lens groups. The lens barrel includes a guide assembly to guide the movable lens groups along an optical axis to prescribed positional states. The zoom lens system is such that the total zoom lens length is not excessively long even during short-distance focusing. Also, during short-distance focusing, the lens barrel is configured such that the most imagewise negative lens group moves objectwise in the extreme wide-angle positional state and imagewise in the extreme telephoto positional state. Also, when the zoom lens is in the extreme telephoto positional state, short-distance focusing is accomplished by causing one or more of the multiple groups of the zoom lens to move imagewise. The zoom lenses of the zoom lens system preferably satisfy at least one of a number of design conditions.

REFERENCES:
patent: 4054371 (1977-10-01), Yasukuni
patent: 4226520 (1980-10-01), Uesugi
patent: 5034762 (1991-07-01), Kohmoto
patent: 5495309 (1996-02-01), Shiina et al.
patent: 5973855 (1999-10-01), Shibayama

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