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. 06, 1994
Filed:
Dec. 31, 1992
Applicant:
Inventor:
Katsuhiro Takada, Tokyo, JP;
Assignee:
Olympus Optical Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
359689 ; 359691 ; 359692 ; 359784 ;
Abstract
The invention provides an ultra-wide zoom lens system that has a very wide angle coverage, as indicated by a field angle change of about 92.degree. to about 65.degree., is bright, as indicated by an F-number of 4.5 at the telephoto end, and is relatively simple in lens unit construction, and consists of, in order from the object side, a first lens unit I of negative refracting power, a second lens unit II of positive refracting power and a third lens unit III of negative refracting power, all said lens units being moved toward the object side for wide angle to telephoto zooming. The zoom lens system then conforms to Conditional Formulae (1), (2) and (3):