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:
Sep. 26, 2000
Filed:
Aug. 20, 1999
Applicant:
Inventors:
Satoshi Yahagi, Kitaadachi-gun, JP;
Tetsuya Ori, Kawaguchi, JP;
Assignee:
Fuji Photo Optical Co., Ltd., Omiya, JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
359687 ;
Abstract
A compact zoom lens having only four lens groups is provided which changes power by shifting a second lens group from the object side along the optical axis, and stabilizes the image plane position by shifting a fourth lens group from the object side along the optical axis. By satisfying three prescribed conditions, magnification of the image is prevented from decreasing for objects at very near distances, and aberrations are favorably corrected so as to provide for high quality imaging over the entire range of zoom for all object distances. At least one lens element has an aspherical surface.