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Amorphous Film Printing Using DC Power and Pulse Selection

IP.com Disclosure Number: IPCOM000050427D
Original Publication Date: 1982-Oct-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Aviram, A: AUTHOR [+2]

Abstract

Amorphous print films having bistable properties are capable of high speed printing using a DC power supply to supply basic printing power together with a selective pulse generator to provide selectivity.

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Amorphous Film Printing Using DC Power and Pulse Selection

Amorphous print films having bistable properties are capable of high speed printing using a DC power supply to supply basic printing power together with a selective pulse generator to provide selectivity.

Four-layer resistive ribbons for electrothermal printing have usually relied on a resistive layer comprised of graphite dispersed in a polymer binder. Recently a different resistive layer has been proposed and tested that consists of evaporated silicon-metal alloys.

These films have I-V characteristics typical of many amorphous films, namely, they display a bistability as shown in Fig. 1. Most of these films switch at about 4-10 volts from a high impedance state to a low impedance state.

When voltage or current source drivers are employed, power delivery at levels required for printing is obtained. The threshold voltages are between 7-10 volts for the voltage source, and the threshold current is above 30 ma for the current source with 1 msec pulses. The lowest currents and voltages measured for printing were for continuous DC line printing. In this case, the threshold voltages are in the neighborhood of 4.5+0.5 volts and the currents in the range of 10-15 ma.

A new printing mode is described that takes advantage of the switching properties of some silicon-metal films. Fig. 2 shows the I-V characteristics of some of the silicon-metal films during printing experiments with a DC power supply. Printing occur...