The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 30, 1985
Filed:
Jul. 14, 1983
Nagayoshi Hirano, Ohmiya, JP;
Fuji Photo Optical Co., Ltd., Ohmiya, JP;
Abstract
A zoom lens system for use as a copying lens, for example, comprises first to sixth elements arranged in this order from front to rear with a stop disposed between the third and fourth elements. The first element is a positive lens convex to the front and the second element is a negative lens concave to the front. The first and second elements together form a first stationary lens group having negative power. The third element is a positive lens and forms a first movable lens. The sixth, fifth and fourth elements are reverse duplicates of the first, second and third elements. The fourth element forms a second movable lens, and the fifth and sixth elements together form a second stationary lens group. The lens system is axially movable as a unit between fixed image and object planes. The first and second movable lenses are axially movable in response to the axial movement of the entire lens system to vary the magnification of the image. The following three conditions are satisfied.