Apparatus for storing a voltage analogous to an exposure parameter in photographic cameras

US4080611A · kind A · utility

Assignee

• Ernst Leitz GmbH

Inventors

• Walter Bletz · Solms, DE
• Werner Holle · Wetzlar, DE

Key dates

• Filing date: Jul 1, 1976
• Grant date: Mar 21, 1978
• Expiry date: Jul 1, 1996

Classification

• Technology area (CPC G): Physics
• CPC primary: G03B7/095
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Apparatus for storing a voltage analogous to an exposure parameter in photographic cameras with an electronic timer and with electric exposure measurement, having the characteristics that an analog-to-digital converter is provided as the storage unit, containing a digital-to-analog converter, the output voltage of which is fed to a comparator wherein this output voltage is compared with the voltage delivered by the exposure meter part. The signal obtained at the comparator output in the case of voltage identity stops the analog-to-digital converter and the voltage remaining at the output of the digital-to-analog converter controls the respective exposure parameter in the camera.