Zoom lens system for use in a copying apparatus

Details Zoom lens system for use in a copying apparatus Zoom lens system for use in a copying apparatus

1993-03-26

1994-09-06

Ben, Loha

Optical: systems and elements

Lens

With variable magnification

359683, 359684, 359685, 359689, 359686, G02B 1514

Patent

active

053453387

ABSTRACT:
A zoom lens system for use in a copying apparatus has first, second and third lens units of negative, positive and negative, respectively. Zooming is performed while the conjugate distance is kept constant by varying the distance between the first and second lens units and the distance between the second and third lens units and varying at a magnification either larger or smaller than unity the distance between the second and third lens elements of the second lens unit. The first lens unit has a lens element strongly concave to the object side. The second lens unit has a positive meniscus lens element, a bi-concave lens element and a bi-convex lens element. The third lens unit has a negative meniscus lens element concave to the image side.

REFERENCES:
patent: 4832465 (1989-05-01), Arai et al.
patent: 5039211 (1991-08-01), Maruyama
patent: 5270864 (1993-12-01), Watanabe

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