Electrophotographic printer comprising an exposure energy correcting means for the optical character generator

US4780731A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Edmund Creutzmann · Borgo San Lazzaro, DE
• Manfred Maier · Lutherstadt Eisleben, DE

Key dates

• Filing date: May 26, 1987
• Grant date: Oct 25, 1988
• Expiry date: May 26, 2007

Classification

• Technology area (CPC G): Physics
• CPC primary: G06K15/1247
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

An electrophotographic printer having an optical character generator and an exposure energy correcting means formed of a light-emitting diode strip for the optical character generator. Upon call-in of a balancing routing, an automatic balancing of the light-emitting elements occurs by use of a photoelement which acquires a radiant intensity transmitted onto the recording medium by every light-emitting element under prescribed normal operating conditions, and which supplies corresponding signals to a control means coupled to the light-emitting element. The control means then assigns every light-emitting element an individual actuation time and stores this in a switching time memory. Upon actuation, every light-emitting element thus supplies the same radiant energy to the recording medium.