Zoom lens system

Details Zoom lens system Zoom lens system

1991-03-07

1992-08-11

Arnold, Bruce Y.

Optical: systems and elements

Lens

With variable magnification

359679, G02B 1514

Patent

active

051384930

ABSTRACT:
A zoom lens system including, from an enlargement side, a first lens unit of a positive power, a second lens unit of a positive power and a third lens unit of a negative power. The first and third lens units monotonously move toward a reduction side during a zooming operation from the longest focal length condition to the shortest focal length condition, while the second lens unit which is closest to the third lens unit at the longest focal condition moves so as to be most proximate to the first lens unit at the shortest focal length condition. The zoom lens system fulfills the following conditions,

REFERENCES:
patent: 4733951 (1988-05-01), Pareigat

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