Zoom lens

Details Zoom lens Zoom lens

1984-06-26

1987-01-06

Corbin, John K.

G02B 1514

Patent

active

046342370

ABSTRACT:
A zoom lens comprises, in the order from the object side, a first lens group which has a positive power and is fixed in position during zooming, second and third lens groups which have negative powers and movable during zooming, and a fourth lens group which is fixed in position during zooming.
When the zoom lens is zoomed from a side angle end to a telephoto end, the second lens group is monotonously moved along an optical axis from the object side to the image side, and the third lens group reciprocates along the optical axis. The zoom lens satisfies the certain conditions.

REFERENCES:
patent: 4281906 (1981-08-01), Tanaka
patent: 4518228 (1985-05-01), Sugiura
patent: 4572620 (1986-02-01), Kikuchi

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