Zoom lens system having a lens unit with a variable refractive p

Details Zoom lens system having a lens unit with a variable refractive p Zoom lens system having a lens unit with a variable refractive p

1987-12-17

1989-10-03

Sugarman, Scott J.

350419, 350423, G02B 1516, G02B 314

Patent

active

048712400

ABSTRACT:
Disclosed is a zoom lens comprising a first lens group having a first lens unit movable on the optic axis to effect a magnification change, a correcting lens unit whose refractive power is variable to correct the movement of the image surface during the magnification change, and a second lens group having a second lens unit whose refractive power is variable for the magnification change.

REFERENCES:
patent: 4407567 (1983-10-01), Michalot et al.
patent: 4712882 (1987-12-01), Baba et al.

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