The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 25, 1990
Filed:
Nov. 02, 1988
Alfred Hirt, Munchen, DE;
MAN Technologie GmbH, Munchen, DE;
Abstract
The invention proposes an electrical image producing device for use with printing image carriers of printing presses. The main components of the device are writing units designed in the form of electrodes which are able to be activated individually in accordance with the image to be produced by connection with a power supply. In the case of a purely electrical form of the device the writing units consist of a stylus which is able to be connected with the power supply via a photoconductor. For driving the stylus use is made of a light guide on which there is a magneto-optic light switching module controlled by current pulses. In one switched state the light switching module allows the passage of a light ray from a light source through the light guide, the light ray passing through the photoconductor and making it locally electrically conducting. In this manner an electric potential is produced at the stylus which cooperates with a counter electrode so as to produce an electric field modifying the printing image carrier.