Copying lens system

Details Copying lens system Copying lens system

1990-07-12

1992-01-28

Dzierzynski, Paul M.

Optical: systems and elements

Lens

With variable magnification

359689, G02B 912

Patent

active

050847848

ABSTRACT:
A copying lens system of a three-unit-three-element composition comprises, from either the object or image side, a positive meniscus first lens element that is convex toward the object or image side, a negative second lens element, and a positive third lens element, which lens system satisfies certain conditions, to obtain a copying lens system that has a simple and compact three-unit-three-element composition, that can be manufactured at a low cost by using inexpensive lens materials, and provides satisfactory performance over a broad zooming range of from about 0.3X to 2.0X.

REFERENCES:
patent: 3418039 (1968-12-01), Kingslake
patent: 3838910 (1974-10-01), Ruben
patent: 3910685 (1975-10-01), DeJager
patent: 3967884 (1976-07-01), DeJager
patent: 4892398 (1990-01-01), Kubo et al.

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