Zoom lens

Details Zoom lens Zoom lens

1996-07-22

1998-05-19

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

G02B 1514

Patent

active

057543461

ABSTRACT:
A zoom lens of the rear focus type including, from an object side to an image side, a first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive refractive power having a stop, and a fourth lens unit of positive refractive power. During zooming from a wide-angle end to a telephoto end, the second lens unit is moved toward the image side, the third lens unit and the stop are moved in unison in a locus convex toward the object side, and the fourth lens unit is moved in a locus convex toward the object side. During focusing, the fourth lens unit is moved, and the following condition is satisfied: -0.3<M3max/.phi..sub.1 <-0.04, where M3max is a maximum value of an amount of axial movement of the third lens unit and the stop from the wide-angle end (a moving direction to the object side being taken as "-"), and .phi..sub.1 is the outer diameter of a frontmost lens of the zoom lens.

REFERENCES:
patent: 5138492 (1992-08-01), Hamano et al.
patent: 5247393 (1993-09-01), Sugawara

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