Compact zoom lens

Details Compact zoom lens Compact zoom lens

1987-09-23

1989-02-07

Corbin, John K.

G02B 1514, G02B 964

Patent

active

048027472

ABSTRACT:
A compact zoom lens comprising, from front to rear, a first lens unit of positive power for focusing, a second lens unit of negative power monotonously movable for zooming, a third lens unit held stationary during zooming, and a fourth lens unit of positive power to move in a locus convex toward the front to maintain the constant position of an image plane which shifts as the image magnification varies, a fixed stop for determining F-numbers being located between the second and third lens units.

REFERENCES:
patent: 3848967 (1974-11-01), Grey
patent: 4256381 (1981-03-01), Kreitzer

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