Zoom lens system

Details Zoom lens system Zoom lens system

1992-12-07

1996-07-23

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359684, 359740, G02B 1514

Patent

active

055395821

ABSTRACT:
A zoom lens system is provided with, from the object side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power and a third lens unit having a negative refractive power. Zooming from a shortest focal length condition to a longest focal length condition is performed by moving all of the lens units while reducing the distance between the first and second lens units and the distance between the second and third lens units. The second lens unit includes three lens elements of a positive lens element, a negative lens element and a positive lens element from the object side.

REFERENCES:
patent: 4936661 (1990-06-01), Betensky
patent: 4955700 (1990-09-01), Tamaguchi
patent: 5042926 (1991-08-01), Kikuchi
patent: 5059006 (1991-10-01), Kikuchi
patent: 5216547 (1993-06-01), Ogata

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