METHOD FOR DETERMINING THE RELATIVE POSITION OF FIRST AND SECOND IMAGING DEVICES, METHOD OF CORRECTING A POSITION OF A POINT OF PROJECTION OF THE DEVICES, PRINTING FORM EXPOSER, PRINTING UNIT, PRINTING UNIT GROUP AND PRINTING PRESS

US6836740B2 · kind B2 · utility

Assignee

• Heidelberger Druckmaschinen AG · DE

Inventors

• Thomas Kohler · Neuenstadt am Kocher, DE
• Bernhard Zintzen · Heidelberg, DE

Key dates

• Filing date: Jan 31, 2003
• Grant date: Dec 28, 2004
• Expiry date: Jan 31, 2023

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04N2201/04734
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A method of determining a relative position of first and second imaging devices includes setting an image of a group of mutually different reference patterns and a basic pattern on an imaging medium, with the second imaging device. Each reference pattern of the group is assigned uniquely to one relative position. An image of at least one test pattern is set over the basic pattern by the first imaging device, for forming a combination pattern. A reference pattern having an area coverage coinciding with an area coverage of the combination pattern is identified from the group of reference patterns. A relative position associated with the identified reference pattern of the group of reference patterns is then identified. A printing form exposer, a printing unit, a printing unit group and a printing press for performing the method are also provided.