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:
Nov. 08, 1977
Filed:
Apr. 14, 1976
Waldemar T Rentschler, Calmbach, Black Forest, DT;
Franz W Starp, Calmbach, Black Forest, DT;
Karl Helber, Calmbach, Black Forest, DT;
Prontor-Werk Alfred Gauthier GmbH, Wildbad, Black Forest, DT;
Abstract
A camera shutter that has an electronic timing device and a photo-electric resistor and associated capacitor timing circuit; a charge starting contact is actuatable to commence the timing circuit action, and an electro-magnetically actuated locking device energized by the timing circuit to hold the shutter blade system open for the duration of the exposure time as determined by the photo-electric resistor. In addition, a mechanical device is provided which acts to delay the opening movement of the driving mechanism of the shutter blade system after actuation of the contact by an amount to compensate for the time taken by the electro-magnetic locking device to move to an unlocking position after the magnet thereof is de-energized by the timing circuit.