Constant Power Drive Circuit for Resistive Ribbon Printing
Original Publication Date: 1985-Jun-01
Included in the Prior Art Database: 2005-Feb-18
This article describes a constant power resistive ribbon printing system in typical resistive ribbon printing systems, a print head consisting of a series of electrodes contacts a ribbon consisting of a resistive layer, a conducting ground plane and a layer of easily melted ink. When current is passed through the resistive layer from an electrode to the ground plane layer, local heating occurs that causes melting of ink and transfer of ink to an underlying substrate, such as paper. A major problem with such systems lies in the control of energy delivered to the ribbon since too much energy may lead to degradation effects to ribbon and print head, while too little energy may lead to inability to print.