Reading zoom lens system

Details Reading zoom lens system Reading zoom lens system

1992-08-27

1993-09-21

Arnold, Bruce Y.

Optical: systems and elements

Lens

With variable magnification

359683, G02B 1514

Patent

active

052473945

ABSTRACT:
The improved reading zoom lens system includes, in order from the object side, a front group that has a positive power and that is of a four-unit-six-element composition and a rear group that has a positive power and that is composed of two elements, which lens system is capable of zooming by changing the distance between the front and rear groups and satisfies the following conditions (a) to (c):

REFERENCES:
patent: 3576358 (1971-04-01), Hayamizu et al.
patent: 5144489 (1992-09-01), Shibayama

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