Apparatus for scanning masters

US6587230B1 · kind B1 · utility

Assignee

• Heidelberger Druckmaschinen AG · DE

Inventors

• Helmut Lange · Schwentinental, DE
• Axel Heuer · Fahren, DE
• Axel Gebhardt · Kiel, DE
• Bernd Lassen · Mönkeberg, DE

Key dates

• Filing date: Sep 24, 1999
• Grant date: Jul 1, 2003
• Expiry date: Sep 24, 2019

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04N1/0678
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

In an apparatus for point-by-point and line-by-line, opto-electronic scanning of masters chucked on a scanner drum, an illumination unit is provided for generating an illumination spot on the master. A scanner objective, a scanner element and a feed support is provided at which the illumination unit, the scanner objective and the scanner element are arranged. The illumination unit comprises a light conductor that is aligned in the direction of the rotational axis of the scanner drum and has a light exit face for generating a light spot and has optical elements for imaging the light spot onto the master as an illumination spot. At least a sub-section of the light conductor in the region of the light exit face can be inclined by small angles relative to the rotational axis with a Cardanic bearing for fine adjustment of optical beam paths, as a result whereof the illumination spot is displaced on the scanner drum. The slope of the light conductor that has been found to be optimum is then fixed.