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:
Jan. 31, 1995
Filed:
Nov. 12, 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 ; 359784 ;
Abstract
A zoom lens system comprising, in order from the object side, a first lens unit having a negative refractive power as a whole, a second lens unit having a negative refractive power as a whole and a third lens unit having a positive refractive power as a whole. This zoom lens system has a very wide field angle of approximately 102.degree. to 93.degree., a high aperture ratio of F/2.8 and a relatively simple composition.