Zoom lens system for use in copying apparatus

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

1992-04-29

1993-12-14

Arnold, Bruce Y.

Optical: systems and elements

Lens

With variable magnification

359685, 359689, G02B 1514, G02B 912

Patent

active

052708640

ABSTRACT:
A zoom lens system includes from one side to the other side: a first lens unit of a negative power having a negative lens element concave to the one side; a second lens unit of a positive power having a positive meniscus lens element convex to the one side, a biconcave lens element whose one side surface has a larger radius of curvature and a biconvex lens element; and a third lens unit of a negative power having a negative meniscus lens element concave to the other side. In order to perform zooming, the distance between the first lens unit and the second lens unit and the distance between the second lens unit and the third lens unit are varied, and the entire zoom lens system is moved along the optical axis.

REFERENCES:
patent: 4707082 (1987-11-01), Itoh
patent: 4735496 (1988-04-01), Arai
patent: 4805999 (1989-02-01), Ueda et al.
patent: 4813773 (1989-03-01), Minefuji
patent: 5039212 (1991-08-01), Kanoshima

Affiliated with

Also associated with

Rating

Zoom lens system for use in copying apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Zoom lens system for use in copying apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Zoom lens system for use in copying apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1710450