Zoom lens

Details Zoom lens Zoom lens

1991-06-25

1993-01-12

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359685, G02B 1514

Patent

active

051794721

ABSTRACT:
A zoom lens comprises first to fourth lens groups in order from the subject end. Second to third lens groups move along optical axis of the zoom lens for zooming between a wide-angle end where the zoom lens has the shortest focal length and a telephoto end where the zoom lens has the longest focal length. During the zooming, first lens group remains stationary. As the second lens group moves towards the image end for zooming from the wide-angle end to the telephoto end, the third and fourth lens groups are moved so as to initially decrease a relative axial distance therebetween and subsequently increase the axial distance, thereby correcting changes in focus caused by the axial movement of the second lens group during zooming.

REFERENCES:
patent: 4482218 (1984-11-01), Tanaka
patent: 4504124 (1985-03-01), Imai et al.

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