Zoom lens system

Details Zoom lens system Zoom lens system

1997-09-22

2000-08-08

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359684, 359689, 359692, G02B 1522

Patent

active

061010456

ABSTRACT:
A zoom lens system has from an object side a first lens group of a positive refractive power, a second lens group of a positive refractive power and a third lens group of a negative refractive power. The second lens group has from the object side a lens unit and a positive lens element convex to the object side. Focusing for a close object is performed by moving the lens unit toward the object side. In the zoom lens, the following condition is fulfilled: ##EQU1## where r1 is a radius of curvature of an object side surface of the positive lens element and r2 is a radius of curvature of an image side surface of the positive lens element.

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patent: 5592334 (1997-01-01), Oshikiri et al.
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