Variable-power copying lens

Details Variable-power copying lens Variable-power copying lens

1984-08-31

1986-07-01

Corbin, John K.

350463, G02B 964, G02B 1514

Patent

active

045976414

ABSTRACT:
There is disclosed a variable-power copying lens including, successively in order from an object, a first lens group having a positive focal length and a second lens group having a negative focal length. The first and second lens groups are movable in their entirety while varying an interval therebetween to keep constant the distance between an object surface and an image-focusing surface. The first lens group comprises a first positive lens, a second negative lens, a third positive lens, a fourth negative lens, and a fifth positive lens. The second lens group comprises a sixth positive-meniscus lens having a convex surface facing an image and a seventh negative-meniscus lens having a convex surface facing the image.

REFERENCES:
patent: 3883228 (1975-05-01), Betensky
patent: 4408841 (1983-10-01), Arai et al.

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