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:
Jul. 01, 1997
Filed:
May. 02, 1995
Applicant:
Inventor:
Hitoshi Hagimori, Nana-ken, JP;
Assignee:
Minolata Co. Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
359689 ; 359684 ;
Abstract
A zoom lens system consists of sequentially from the object side a first lens unit having a negative refractive power, a second lens unit having a positive refractive power and a third lens unit having a negative refractive power. Zooming is performed by shifting the second lens unit and the third lens unit. The first lens unit keeps stationary during the zooming. Focusing is accomplished by shifting the second lens unit. The lengths of the first and the second lens unit along the optical axis are optimized so as to fulfill the conditions. The zoom lens system is suitable for particularly underwater cameras.