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. 19, 1992
Filed:
Jul. 23, 1990
Hidefumi Notagashira, Kanagawa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A magnifying power varying device comprises an operation member which is arranged to permit selection between a power varying operation in a telephoto direction and a power varying operation in a wide-angle direction, a transmission mechanism for driving the power varying mechanism, a driving mechanism which generates a driving force, and a change-over mechanism which is arranged to connect the driving mechanism to the transmission mechanism when the power varying operation is performed in the telephoto direction or in the wide-angle direction by means of the operation member and to forcibly disconnect the driving mechanism from the transmission mechanism when the operation of the operation member is canceled.