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. 24, 1977
Filed:
Mar. 04, 1976
Eduard Wagensonner, Aschheim, DT;
Volkmar Stenzenberger, Unterhaching, DT;
AGFA-Gevaert, A.G., Leverkusen, DT;
Abstract
The exposure control circuit of the camera requires a supply voltage which must have an amplitude exceeding a predetermined minimum amplitude. The camera battery is subject undesired decreases in battery output voltage. A transverter circuit has an input connected to the battery and in response to the battery output voltage furnishes a DC output voltage to the exposure control apparatus when the battery output voltage has an amplitude less than the predetermined minimum amplitude. A control circuit is responsive to the voltage applied to the exposure control apparatus and controls a controllable impedance connected between the transverter input and the battery so that the supply voltage applied to the exposure control apparatus remains constant at a value just exceeding the predetermined minimum amplitude when the battery output voltage is too low and disconnects the transverter circuit from the battery when the battery output voltage exceeds the predetermined minimum amplitude. In the latter case a diode is provided for applying the battery output voltage directly to the exposure control circuit.