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

1992-06-19

1994-01-11

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359761, 359740, G02B 1514, G02B 962

Patent

active

052786978

ABSTRACT:
A zoom lens system, for use in a copying apparatus, is provided with, from the object side, a first lens unit of a negative power including a negative lens element, a second lens unit of a positive power including a positive lens element and a negative meniscus lens element concave to the image side, an aperture stop, a third lens unit arranged symmetrically with the second lens unit with respect to the aperture stop, and a fourth lens unit arranged symmetrically with the first lens unit with respect to the aperture stop. The second lens unit and the fourth lens unit are moved in a same direction in association with each other so that the total length of the zoom lens system is minimum at unity magnification. The aperture stop moves so that the symmetry of the entire zoom lens system is maintained. An object-image distance is maintained constant by moving the entire zoom lens system.

REFERENCES:
patent: 4805999 (1989-02-01), Ueda et al.
patent: 4813773 (1989-03-01), Minefuji

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-1635106