Lens system for a copying machine

Details Lens system for a copying machine Lens system for a copying machine

1991-11-12

1993-04-20

Arnold, Bruce Y.

Optical: systems and elements

Lens

With variable magnification

359689, 359784, 359785, G02B 1514

Patent

active

052047806

ABSTRACT:
A three group, three component lens system comprising, in order from one side a first, positive meniscus lens defining a convex surface directed to an object, a second, biconcave lens, and a third, biconvex lens. At least one of the three lenses is formed of plastic. It is recommended to satisfy the following conditional expression:

REFERENCES:
patent: 4561730 (1985-12-01), Lawson
patent: 4620775 (1986-11-01), Fujioka
patent: 4787724 (1988-11-01), Kudo et al.
patent: 4886342 (1989-12-01), Kudo et al.
patent: 4892398 (1990-01-01), Kudo et al.

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