Method of and apparatus for positioning image areas of film

US4987440A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Gerhard Benker · Pullach, DE
• Wilhelm Nitsch · Munich, DE
• Bernd Payrhammer · Munich, DE
• Volker Weinert
• Helmut Treiber · Munich, DE
• Ulrich Kluter · Munich, DE

Key dates

• Filing date: Sep 29, 1989
• Grant date: Jan 22, 1991
• Expiry date: Sep 29, 2009

Classification

• Technology area (CPC G): Physics
• CPC primary: G03D15/003
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

An exposed and developed photographic filmstrip having a series of image areas is conveyed along a path and is photoelectrically scanned at a first location of the path to detect regions characterized by marked density jumps. A signal is generated in response to detection of each such characteristic region and a first distance measuring device disposed near the first location assigns a first distance reading to each characteristic region upon detection thereof. The first distance readings are representative of the positions of the characteristic regions longitudinally of the filmstrip. Each signal is stored together with the respective first distance reading. The stored signals and first distance readings are used to calculate the positions of the image areas longitudinally of the filmstrip, and the calculated positions are likewise stored. From the first location, the filmstrip travels to a second location of the path where a notch is punched in the filmstrip adjacent to each image area. Immediately upstream of the second location, the filmstrip is photoelectrically scanned for a second time to again detect the characteristic regions.