Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2005-Feb-02
Resistive ribbon printing is known in which an electrical current in a ribbon produces localized heating to melt a small area of an ink layer, the melting ink then transferring to a recording sheet, such as paper. A color-on-demand technique for color printing using a resistive ribbon is described in U.S. Patent 4,253,775. In that technique, the ribbon is essentially colorless and the desired pigment is added to it in the printer just prior to the printing operation. This article describes another approach for toning a ribbon to provide the desired color. The ink layer on the resistive ribbon is a dielectric and can be made tacky at elevated temperatures. Being a dielectric, it can be electrostatically charged and toned in the printer environment.