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:
Sep. 26, 1978
Filed:
Feb. 22, 1977
Karl-Peter Strauss, Volkmarode, DE;
Rollei-Werke Franke & Heidecke, Braunschweig, DE;
Abstract
Electronic circuitry for setting or controlling either one of two exposure value factors of a photographic camera, namely, the exposure time (shutter speed) and the diaphragm aperture. The circuitry includes a comparator which receives an input responsive to the film sensitivity, the brightness of the subject, and the preset selected value of the one of the two exposure factors which is to be set manually rather than automatically. The comparator is connected to a flip-flop, a counter, and a decoder in such a way as to provide a signal which can control or operate either a photographic shutter mechanism or a diaphragm aperture mechanism, and the signal also controls the lighting of luminous diodes to give a visual indication of the exposure factor value which has been determined by the circuit as the proper value for an optimum exposure. There is also provision for storing the determined exposure value for later use.