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. 13, 1982
Filed:
Mar. 21, 1980
Yasumasa Tomori, Sakado, JP;
Asahi Kogaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A zoom lens which may include two, three, or four lens groups. One of the lens groups is mounted in a focusing barrel and the others in moving barrels or a mount barrel. A zooming barrel is provided which is rotatable independently from the focusing barrel. A cam sleeve controls the movement of at least predetermined ones of the lens groups for zooming and close-up photographing while a guide ring operatively cooperates with the focusing barrel to provide a mechanical indication as to when a change-over is possible to the close-up photographing mode. A change-over sleeve cooperates with the zooming barrel for controlling the zooming operation. The focusing barrel, the cam sleeve, the guide sleeve and change-over sleeve cooperate with one another after changing to the close-up photographing mode such that the change-over sleeve is prevented from rotating except at one position thereof whereby rotation of the guide ring and focusing barrel are also prevented while simultaneously cooperation between the zooming barrel and change-over sleeve is released to enable the zooming barrel to rotate in the close-up photographing mode.