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. 19, 1978
Filed:
Nov. 08, 1976
Rudolf Lang, Grafing Bahnhof, DE;
Gerhard Schwarz, Munich, DE;
Carl Zeiss Stiftung, Heidenhein on the Brenz, DE;
Abstract
A photographic camera has an interchangeable lens movable from a first or fully seated position on the camera body to a second disengaged position whereupon it may be removed from the camera body. An electric warning signal device has a circuit containing a switch responsive to the position of the interchangeable lens in such a way that the switch is closed to activate the warning signal as soon as the interchangeable lens begins to move away from its fully seated position. In a further development of the invention there is also a second switch in series with the first switch, and this second switch is kept closed so long as the interchangeable lens is in its first position or is in an intermediate position between its first and second positions, and this second switch is opened when the interchangeable lens reaches its second position disengaged from the camera body and ready to be removed therefrom. This second switch opens the circuit and saves drain on the battery when the interchangeable lens is completely removed from the camera.