Compact high-performance zoom lens

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

1995-10-24

1998-06-02

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

G02B 1516

Patent

active

057609691

ABSTRACT:
A compact, high-performance zoom lens is disclosed comprising four lens groups in a positive-negative-negative-positive refractive power arrangement and capable of imaging an object on an image plane over a range of magnifications from a wide-angle mode to a telephoto mode (preferably spanning a zooming ratio of at least 16). In the most preferred embodiment, the zoom lens comprises, coaxially objectwise to imagewise: a first lens group having positive overall refractive power and comprising four lens elements; a second, axially movable for zooming, lens group having negative overall refractive power and comprising five lens elements including a lens element with an aspherical surface; a third, axially movable for zooming, lens group having negative overall refractive power and comprising two lens elements; and a fourth lens group having positive overall refractive power and comprising ten lens elements. Such a zoom lens preferably satisfies one or more of the following conditions:

REFERENCES:
patent: 4871239 (1989-10-01), Masumoto et al.
patent: 5175648 (1992-12-01), Mori
patent: 5327290 (1994-07-01), Fukushima et al.

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