Five-element copying zoom lens system

Details Five-element copying zoom lens system Five-element copying zoom lens system

1987-02-03

1988-04-05

Corbin, John K.

G02B 1500, G02B 960

Patent

active

047354968

ABSTRACT:
A copying zoom lens system consisting of five lens elements. The first and fifth lens elements are each a single negative lens element with a negative focal length. The middle three lens elements are grouped into a central lens unit of positive focal length. The central lens unit has a positive biconvex lens surrounded by two meniscus lenses having their concave surface directed to the biconvex lens. Zooming is achieved by moving the first and fifth lens elements with respect to the central lens unit as well as by moving the overall lens system between fixed image and object planes.

REFERENCES:
patent: 4359269 (1982-11-01), Itoh

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