Four-unit zoom lens system having a high zoom ratio

Details Four-unit zoom lens system having a high zoom ratio Four-unit zoom lens system having a high zoom ratio

1994-08-12

1997-06-17

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359683, G02B 1514

Patent

active

056402767

ABSTRACT:
The invention provides a four-unit type of zoom lens system which is of compact size albeit having a high zoom ratio, and comprises a first unit G1 of positive refracting power, a second unit G2 of positive refracting power, a third unit G3 of negative refracting power, and a fourth unit G4 of negative refracting power, wherein the spaces between the units vary during zooming, said zoom lens system being characterized in that all these units are moved toward the object side for zooming from the wide-angle to telephoto end.

REFERENCES:
patent: 5189557 (1993-02-01), Endo
patent: 5303086 (1994-04-01), Mori

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