Variable magnification lens of rear focus type

Details Variable magnification lens of rear focus type Variable magnification lens of rear focus type

1991-08-08

1992-04-07

Arnold, Bruce Y.

Optical: systems and elements

Lens

With variable magnification

359740, G02B 1500

Patent

active

051033437

ABSTRACT:
A zoom lens is disclosed comprising, in the order from the object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a stop and a third lens unit having a positive refractive power, zooming being performed by moving the second lens unit along an optical axis and focusing being performed by moving the third lens unit, the zoom lens satisfying the following conditions;

REFERENCES:
patent: 4984876 (1991-01-01), Hata et al.
patent: 4991942 (1991-02-01), Fujibayashi et al.

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