Compact zoom lens

Details Compact zoom lens Compact zoom lens

1986-06-23

1988-08-16

Corbin, John A.

G02B 1514, G02B 964

Patent

active

047639989

ABSTRACT:
A zoom lens comprising a first lens unit of positive refractive power for focusing, a second unit of negative refractive power movable for zooming in a mono-direction throughout, a third unit of positive refractive power movable for zooming in the opposite mono-direction to that of movement of the second unit, and a fourth unit of positive refractive power having an image forming function which is held stationary during zooming, with a diaphragm being arranged in between the second and third units to be stationary.

REFERENCES:
patent: 4256381 (1981-03-01), Kreitzer
patent: 4439017 (1984-03-01), Yamaguchi

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