Wide angle copying lens system

Details Wide angle copying lens system Wide angle copying lens system

1986-03-12

1987-09-01

Corbin, John K.

350450, G02B 962

Patent

active

046905189

ABSTRACT:
This invention relates to a completely symmetrical wide angle copying lens system for a compact copying machine using a high output lamp. A topogon type wide angle lens system which is easy in correction of a radial curvature of field is basically used, and positive meniscus lenses having a small refracting power with a convex surface directed toward a diaphragm are symmetrically arranged with the diaphragm placed therebetween. A copying lens system is provided in which the tangential curvature of field and a deviation of the field cased by color are corrected by the construction as described above, the overall length of the lens system is shortened and even if a copying magnification is changed in the range of from .times.0.5 to .times.2.0, the performance is not deteriorated.

REFERENCES:
patent: 3088371 (1963-05-01), Lowenthal
patent: 3370905 (1968-02-01), Hudson
patent: 3871749 (1975-03-01), Harada
patent: 4061419 (1977-12-01), Price et al.
patent: 4269477 (1981-05-01), Kitagawa
patent: 4345823 (1982-08-01), Shinohara

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