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:
Jun. 27, 1995
Filed:
Feb. 16, 1993
Applicant:
Inventor:
Ellis I Betensky, W. Redding, CT (US);
Assignee:
Eastman Kodak Company, Rochester, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
359692 ; 359708 ;
Abstract
A zoom lens suitable for an inexpensive camera has a front positive lens group and a rear negative lens group. Both groups move for zooming with the rear negative group providing most of the variation in focal length. The front positive group includes a front negative component and a rear positive component while the rear negative group includes a rear negative component and a weak plastic element having at least one aspheric surface. The plastic element is sufficiently weak that it does not cause variation in focus with normal variations in temperature and relative humidity. All other elements in the zoom lens are glass.