Motion picture camera

US4200364A · kind A · utility

Assignee

• AGFA-Gervaert AG · DE

Inventors

• Kurt Borowski · Aschheim, DE
• Istvan Cocron · Munich, DE
• Theodor Huber · Munich, DE

Key dates

• Filing date: Jul 26, 1978
• Grant date: Apr 29, 1980
• Expiry date: Jul 26, 1998

Classification

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

Abstract

A motion picture camera wherein the diaphragm is adjusted in automatic response to signals from two outputs of a digital comparator which receives a first set of signals during each revolution of the shutter at a frequency varying as a function of changes of shutter speed and of changes of scene brightness. The comparator further receives a set of reference signals from a digital selector circuit during normal operation of the camera or from a binary counter when the camera is set for making exposures with fade-in, fade-out or lap dissolve. The counter forms part of a program circuit.