Method of and apparatus for positioning photographic originals in a copying station

US4947205A · 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 Klueter · Munich, DE

Key dates

• Filing date: Sep 29, 1989
• Grant date: Aug 7, 1990
• Expiry date: Sep 29, 2009

Classification

• Technology area (CPC G): Physics
• CPC primary: G03B27/6285
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A filmstrip containing a series of images is conveyed along a path which passes by a copying station and a scanning station. The filmstrip is advanced in steps using transporting rolls and a narrow segment of the filmstrip is scanned at the scanning station after every step. A first set of measurements obtained upon scanning of the filmstrip is used to calculate the amounts of light and the exposure times required to properly reproduce the images. A second set of measurements is used to detect characteristic regions of the filmstrip having abrupt changes in density. The positions of the characteristic regions along the filmstrip are established by a counter which counts the steps undergone by the filmstrip and the measurement or measurements corresponding to each characteristic region are stored together with the respective position. The positions of the characteristic regions and the second set of measurements are used to calculate the positions of the images along the filmstrip. After the filmstrip has been completely scanned, the filmstrip is conveyed along the path once more. During the second trip along the path, the filmstrip is scanned again while the distance traveled by th…