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:
May. 23, 1995
Filed:
Jul. 29, 1993
Hironori Shibata, Tokyo, JP;
Atsujiro Ishii, Tokyo, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
A zoom lens system comprising, in order from the object side, a first lens unit which has a positive refractive power and is kept fixed during zooming, a second lens unit which has a negative refractive power, is movable for zooming and has a vari-focal function, a third lens unit which has a positive refractive power and is movable for zooming, and a fourth lens unit which has a positive refractive power and is movable for zooming; a location of the third lens unit at a tele position of the zoom lens system being on the object side of a location of the third lens unit at a wide position of the zoom lens system. This zoom lens system consists of a small number of lens components, and has a vari-focal ratio of 9 to 12 and a wide field angle of 65.degree. to 68.degree. at the wide position thereof.