Zoom lens for use in copying

Details Zoom lens for use in copying Zoom lens for use in copying

1986-08-13

1989-05-23

Corbin, John K.

G02B 1514

Patent

active

048324655

ABSTRACT:
A zoom lens comprising a first and a second lens component that are related to each other for zooming. The first lens component consists of four lens elements and has a positive focal length f.sub.I satisfying the condition 0.35<f.sub.I /f.sub.M <0.85, where f.sub.M is the focal length of the system at unit magnification. The second lens component consists of a negative miniscus lens and possibly a positive lens and has a negative focal length f.sub.II satisfying the condition, 0.7<-f.sub.II /f.sub.M <3.0.

REFERENCES:
patent: 4333711 (1982-06-01), Itoh
patent: 4408841 (1983-10-01), Arai
patent: 4502754 (1985-03-01), Kawa
patent: 4597641 (1986-07-01), Arai

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