Method and test form for equalizing the exposure heads in an exposer for printing originals

US7289137B2 · kind B2 · utility

Assignee

• Heidelberger Druckmaschinen AG · DE

Inventors

• Norbert Liebig · Felm, DE
• Rainer Müllenhagen · Kiel, DE
• Stefan Schmidt · Aalen, DE
• Gerhard Vogler · Stubbendorf, DE

Key dates

• Filing date: Feb 22, 2005
• Grant date: Oct 30, 2007
• Expiry date: Nov 11, 2025

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B41C3/00
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A method and a test form for equalizing exposure heads of an exposer recording printing originals onto a recording material with exposure heads, with regard to the area coverage recorded. Each head contains a laser module generating a laser beam and focusing it onto the material. Each head records a recording band, the laser beams sweeping over the recording material in a main scanning direction while the heads are moved along the material in a secondary scanning direction. A test exposure is carried out, in which each head records a test form having test areas and a background area in its recording band. The area coverage recorded of the background area is compared visually with area coverages recorded of test areas of an adjacent test form and, from differences thereof in adjacent test forms, corrective values for the laser power of the laser modules in the exposure heads are calculated.