Method and device for removing light

US6220715A · kind A · utility

Assignee

• Heidelberger Druckmaschinen AG · DE

Inventors

• Jorg-Achim Fischer · Kiel, DE
• Thomas Jacobsen · Kiel, DE

Key dates

• Filing date: Feb 22, 2000
• Grant date: Apr 24, 2001
• Expiry date: Feb 22, 2020

Classification

• Technology area (CPC G): Physics
• CPC primary: G11B7/135
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

In a method and device for removing light by absorption, undesired light is guided by a light entrance aperture into a hollow body having a light-absorbing inner surface. The light which is directed into the hollow body falls onto the reflection surface of a reflector. The reflection surface is configured and positioned in such a way that the light which is reflected back from the reflection surface is not reflected in itself, that only a minor amount of said light does not reach the outside as scattered light via the light entrance aperture and that a substantial amount of the light reaches the inside of the hollow body where it is absorbed. The invention finds particular use in an electronic recording device for point and line elimination of a recording material with a laser beam, wherein an undesired secondary beam is absorbed according to the inventive method in order to avoid disturbing retroreflections.