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Thermal Biasing for Electrothermic Printing

IP.com Disclosure Number: IPCOM000051659D
Original Publication Date: 1981-Feb-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Wilbur, CV: AUTHOR

Abstract

An improved electrothermic printer is described in which a bias curren can be supplied to reduce the power produced within the print head.

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Thermal Biasing for Electrothermic Printing

An improved electrothermic printer is described in which a bias curren can be supplied to reduce the power produced within the print head.

In the conventional electrothermic printing process all the energy required to melt the ink is supplied through the print head. This results in rather high temperatures within the head as well as voltages and currents which may be difficult to control, especially at higher speeds. A printer to reduce this requirement is shown in the figure, wherein the bias roller 10 is energized by a voltage from power supply 12 to produce a current through the resistive layer 14 to the conductive layer 16 so that ink layer 16 is heated within the area 24 (shown enclosed in dashed lines in the drawing) between bias roller 10 and ground electrode 20. This heating serves to thermally bias the ink layer to a point near its melting point. Thus, the amount of energy required to be produced by the print head 22 and its associated electronic controls is reduced by the amount required to bring the ink in layer 18 to that temperature.

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