Compact high-performance zoom lens

Details Compact high-performance zoom lens Compact high-performance zoom lens

1995-11-02

1997-12-30

Nelms, David C.

Optical: systems and elements

Lens

With variable magnification

359688, 359740, 359737, G02B 1514

Patent

active

057037256

ABSTRACT:
A compact, high-performance zoom lens is disclosed. The zoom lens comprises four lens groups having positive, negative, negative, and positive refractive power, respectively. The lens groups are disposed so as to enable the zoom lens to produce an image of an object on an image plane over a range of magnifications from a wide-angle end to a telephoto end. The second and third lens groups move along the optical axis during zooming. The first lens group preferably includes, objectwise to imagewise, a negative lens element and first, second, and third positive lens elements. The zoom lens satisfies at least the following conditions:

REFERENCES:
patent: 3924934 (1975-12-01), Grey
patent: 4281906 (1981-08-01), Tanaka
patent: 5061051 (1991-10-01), Miyamae
patent: 5383058 (1995-01-01), Yonezawa
patent: 5414562 (1995-05-01), Ueda
patent: 5579172 (1996-11-01), Aoki et al.
patent: 5583700 (1996-12-01), Usui et al.

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