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. 15, 1979
Filed:
Sep. 26, 1977
AGFA-Gevaert, A.G., Leverkusen, DE;
Abstract
An analog signal whose value is proportional to scene-light intensity is converted into a multi-bit digital signal of corresponding value. A train of clock pulses is generated, having a repetition frequency greater than the reciprocal of the shortest exposure duration to be establishable by the control system. The digital light-intensity signal is continually totalized during the course of an exposure by a clocked totalizer which operates in synchronism with the train of clock pulses and produces during the course of the exposure a multi-bit digital totalized-light signal. A comparator has a first input at which it receives the totalized-light signal and a second input at which it receives a digital total-required-light signal. The latter signal is furnished by an addressable storage which stores a plurality of total-required-light signals of different respective values, corresponding to different exposure programs. A selector operated by the photographer or automatically addresses the addressable memory, causing the latter to furnish to the comparator the total-required-light signal appropriate for the exposure program involved.