Zoom lens system

Details Zoom lens system Zoom lens system

1990-04-17

1991-09-17

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359676, 359708, G02B 1514

Patent

active

050489399

ABSTRACT:
A zoom lens system comprises, from an objective sequentially, a first lens group (1) having a positive power, a second lens group and a third lens group (2) and (3) having negative power and performing a zooming function by moving along an optical axis, a fourth lens group (4) having a positive power and being always stationary, and a fifth lens group (5) having a positive power and having a triplet structure including, from an object side sequentially, a first lens (9) having a positive power, a second meniscus lens (10) having a negative power and a third lens (11) having a positive power, the fourth lens group including a lens at least one surface of which is aspherical, the first or the fifth lens group being movable as a whole or partially along an optical axis to perform a focusing function. The first, second and third lens groups satisfy the following conditions:

REFERENCES:
patent: 4720181 (1988-01-01), Hata

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