Zoom lens system

Details Zoom lens system Zoom lens system

1997-12-17

1999-03-23

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359684, G02B 1514

Patent

active

058868283

ABSTRACT:
A zoom lens system, includes a first lens group of a positive refractive power viewed from the object's side having a concave lens and convex lens adhered to the concave lens and at least two meniscus lenses whose entrance surfaces are convex; a second lens group of a negative refractive power; a third lens group of a positive refractive power having at least one biconvex aspherical lens, at least one convex lens and a concave lens; and a fourth lens group of a positive refractive power having one concave lens and two convex lenses.The second lens group is movable for changing the magnification, and the fourth lens group is movable for compensating the shift of an image plane caused by the movement of the second lens group and for focusing an image.

REFERENCES:
patent: 5235466 (1993-08-01), Ono et al.

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