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. 20, 1983
Filed:
Oct. 02, 1981
Takeshi Muryoi, Chigasaki, JP;
Nippon Kogaku K.K., Tokyo, JP;
Abstract
A zoom lens barrel having a single operating ring for effecting focusing by rotating operation of the operating ring about the optical axis with respect to a fixed portion and zooming by moving operation of the operating ring in the direction of the optical axis includes means provided between the operating ring and the fixed portion for limiting the operations by the operating ring. The limiting means impedes the focusing with respect to an object lying at a shorter distance than a predetermined distance when the operating ring is in a position corresponding to a short focal length with a predetermined focal length as the boundary and impedes the zooming to the short focal length when the operating ring is in a position corresponding to the focusing with respect to the object lying at the shorter distance.