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:
Apr. 02, 1996
Filed:
Jul. 13, 1993
Minoru Oshikiri, Tokyo, JP;
Olympus Optical Co., Ltd., Toyto, JP;
Abstract
A wide-angle zoom lens system having a high vari-focal ratio comprising, in order from the object side, a first lens unit having a negative refractive power, a second lens unit having a negative refractive power and a third lens unit having a positive refractive power, and configured so as to change a magnification thereof by varying at least one airspace reserved between the first lens unit and the second lens unit. Owing to a fact that a distance as measured between principal points of the first lens unit and the second lens unit is defined within a certain definite range, the zoom lens system has a wide field angle of 70.degree. or larger, a high vari-focal ratio of approximately 4, a telephoto ratio of approximately 1.5 at a tele position thereof and a compact size, and can be manufactured at a low cost.