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:
Mar. 02, 1982
Filed:
Jun. 13, 1980
Takashi Isobe, Tokyo, JP;
Masao Aoyagi, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An interchangeable lens unit is formed with an adapter shell rotatable relative to a unit housing and maintained stationary along with signal members of a diaphragm therein during coupling and decoupling of the lens unit effected by rotating a bayonet fixedly carried on the unit housing relative to a camera body. In rotating the unit in a loosening direction, an index mechanism operates to permit disengagement of a female bayonet of the unit away from a male bayonet of the camera body only when the unit housing is accurately oriented relative to the adapter shell. In a later coupling operation, it is therefore insured that the signal members can be brought into operative connection with respective operational members of a diaphragm control mechanism which is disposed in the camera body despite the presence of a significant clearance between the male and female bayonets.