Zoom lens

Details Zoom lens Zoom lens

1994-08-30

1996-06-04

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

G02B 1514

Patent

active

055238882

ABSTRACT:
A zoom lens comprising, from front to rear, a first lens unit of negative refractive power, a second lens unit of positive refractive power, a third lens unit of positive refractive power and a fourth lens unit of negative refractive power, zooming being performed by varying each separation between the first to fourth lens units in such a manner that, as compared with the wide-angle end, when in the telephoto end, the separations between the first and second lens units and between the third and fourth lens units are shorter and the separation between the second and third lens units is longer, satisfying the following conditions:

REFERENCES:
patent: 4756609 (1988-07-01), Estelle
patent: 4787718 (1988-11-01), Cho
patent: 5111338 (1992-05-01), Nakayama
patent: 5264965 (1993-11-01), Hirakawa

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