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:
Dec. 10, 1991
Filed:
Apr. 11, 1989
Applicant:
Inventors:
Nobuyoshi Mori, Hachioji, JP;
Akira Ishisaka, Hachioji, JP;
Assignee:
Konica Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ;
U.S. Cl.
CPC ...
359692 ; 359740 ; 359795 ;
Abstract
A small type zoom lens composed of 3 to 5 lenses, which is suitable for a compact camera. The lens has a telephoto type optical arrangement including a positive first lens unit and a negative second lens unit, both of the lens units being moved forward as a whole while narrowing a space therebetween during variation of power from a short focal end to a long focal end. The first lens unit has an arrangement of refracting powers substantially symmetrical with respect to a diaphragm to correct aberrations produced by the second lens unit composed of a negative single lens.