Compact zoom lens

Details Compact zoom lens Compact zoom lens

1993-05-19

1994-02-22

Arnold, Bruce Y.

Optical: systems and elements

Lens

With variable magnification

359676, 359684, 359716, G02B 1514

Patent

active

052893170

ABSTRACT:
A zoom lens comprising, from front to rear, a first lens group of negative power, a second lens group of positive power and a third lens group of negative power, wherein as zooming from the wide-angle end to the telephoto end is performed by moving the first, second and third lens groups, the second and third lens groups both are directed forward and the speed of movement of the third lens group is faster than that of movement of the second lens group, the zoom lens satisfying the following conditions:

REFERENCES:
patent: 4586793 (1986-05-01), Tanaka et al.
patent: 4936661 (1991-06-01), Betensky et al.
patent: 4955700 (1990-09-01), Yamaguchi

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