Zoom lens for variable magnification copying machine

Details Zoom lens for variable magnification copying machine Zoom lens for variable magnification copying machine

1990-05-11

1991-08-13

Arnold, Bruce Y.

Optical: systems and elements

Lens

With variable magnification

359740, 359756, G02B 1500, G02B 964

Patent

active

050392123

ABSTRACT:
A zoom lens for a variable magnification copying machine has a first lens composed of a concave lens; a second lens composed of a convex lens; a third lens composed of a meniscus concave lens and having a concave face on an object side; a diaphragm; a fourth lens composed of the same lens as the third lens and having a concave face on an image face side; a fifth lens composed of the same convex lens as the second lens; a sixth lens composed of the same concave lens as the first lens; the first to sixth group lenses being sequentially arranged from an object face toward the image face; the first to sixth lenses being symmetrically arranged around the diaphragm when the object is formed as an image on the image face at equal magnification; and a device for symmetrically moving at least the first and sixth lenses among the first to sixth lenses and the diaphragm and moving the entire lens system in the direction of an optical axis when the object is formed by changing the magnification as an image on the image face so as to continuously change the magnification while a conjugate length from the object face to the image face is constantly held at the times of equal and variable magnifications.

REFERENCES:
patent: 4812021 (1989-03-01), Harrigan
patent: 4813773 (1989-03-01), Minefuji

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