Zoom lens

Details Zoom lens Zoom lens

1984-05-18

1986-03-18

Corbin, John K.

350423, G02B 936, G02B 1514

Patent

active

045764450

ABSTRACT:
A zoom lens having a change-magnification range ranging from wide angle to telephoto comprises, in succession from the object side, first lens group of positive refractive power movable on the optical axis, a second lens group of negative refractive power fixed relative to the image plane at a determined position, a third lens group of negative refractive power movable on the optical axis, and a fourth lens group of positive refractive power movable on the optical axis. The first and fourth lens groups are moved toward the object side in linear fashion to change magnification from the wide angle end to the telephoto end while the third lens group is moved toward the object side at the same time in non-linear fashion to keep the image plane at the determined position.

REFERENCES:
patent: 4192577 (1980-11-01), Ogino
patent: 4390248 (1983-06-01), Ikemori

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