Electronic storage, indicator and exposure time control device for photographic cameras

US4047189A · kind A · utility

Assignee

• Ernst Leitz GmbH

Inventors

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

Key dates

• Filing date: Mar 15, 1976
• Grant date: Sep 6, 1977
• Expiry date: Mar 15, 1996

Classification

• Technology area (CPC G): Physics
• CPC primary: G03B7/093
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

An electronic device for storing and indicating illumination parameters and for controlling the exposure time for photographic cameras having an exposure meter and a timer. The exposure meter includes an analog/digital converter with a digital storage part having a plurality of binary stages. These various stages correspond to different intensities of illumination of an object. The timer includes a combination of binary ratio reducers and logic gates and these are adapted to be selected by the analog/digital converter or by manual adjustment. A generator produces impulses which control the timer.