Zoom lens system

Details Zoom lens system Zoom lens system

1990-02-26

1990-12-25

Sugarman, Scott J.

350426, G02B 1514

Patent

active

049798065

ABSTRACT:
A zoom lens system comprising, in order from an enlargement side, a first lens group of a negative power, a second lens group of a positive power and a third lens group of a negative power. The first lens group is fixed during a zooming operation and includes, in order from the enlargement side, a positive lens element, a negative lens element and an aperture stop. The second lens group is movable toward a reduction side during a zooming operation and includes, in order from the enlargement side, a biconvex lens element, a negative meniscus lens element having a concave surface directed to the enlargement side, a positive lens element, a biconcave lens element and a biconvex lens element. The third lens group is also movable toward the reduction side during a zooming operation and includes, in order from the enlargement side, a biconcave lens element and a positive lens element.

REFERENCES:
patent: 4198128 (1980-04-01), Ocino
patent: 4303311 (1981-12-01), Nakamura
patent: 4733951 (1988-03-01), Pareigat
patent: 4743102 (1988-05-01), Pareigat
patent: 4746204 (1988-05-01), Pareigat
patent: 4750820 (1988-06-01), Pareigat
patent: 4779969 (1988-10-01), Sato et al.
patent: 4824236 (1989-04-01), Ueda
patent: 4838667 (1989-06-01), Ueda
patent: 4906078 (1990-03-01), Inabata et al.

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