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Resistive Ribbons for Thermal Transfer Printing

IP.com Disclosure Number: IPCOM000103521D
Original Publication Date: 1990-Dec-01
Included in the Prior Art Database: 2005-Mar-18
Document File: 1 page(s) / 57K

Publishing Venue

IBM

Related People

Aviram, A: AUTHOR [+2]

Abstract

The structure of presently used resistive printing ribbons consists of at least three layers, there being an aluminum film (1000 Ao thick) between a resistive layer and an ink layer. An ink transfer layer that facilitates transfer of ink to a recording layer (such as paper) is optionally used. The transfer layer is located between the ink layer and the aluminum layer. The purposes of the aluminum layer are to provide a good current ground return and to lead to interface resistance (due to the presence of Al2O3) and a knee voltage. The exposed surface of the resistive layer is in contact with printing electrodes during the printing operation. The contact resistance at the electrodes-resistive layer interface produces heating as the printing pulse is applied.

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This is the abbreviated version, containing approximately 67% of the total text.

Resistive Ribbons for Thermal Transfer Printing

      The structure of presently used resistive printing ribbons
consists of at least three layers, there being an aluminum film (1000
Ao thick) between a resistive layer and an ink layer.  An ink
transfer layer that facilitates transfer of ink to a recording layer
(such as paper) is optionally used. The transfer layer is located
between the ink layer and the aluminum layer.  The purposes of the
aluminum layer are to provide a good current ground return and to
lead to interface resistance (due to the presence of Al2O3) and a
knee voltage.  The exposed surface of the resistive layer is in
contact with printing electrodes during the printing operation.  The
contact resistance at the electrodes-resistive layer interface
produces heating as the printing pulse is applied.  This contact
resistance is dependent on the contact area, and hence on the size of
the printing electrodes.  Contact resistance limits the printing
speed and the practical minimum size of the electrodes, which is
typically about two mils.

      In some applications it may be desirable to print with smaller
electrodes, and in those applications the present ribbon
configuration fails.  To solve this, a ribbon configuration having
only a top layer of aluminum, or two layers of aluminum, one in
addition to the above-mentioned aluminum layer, is used.  In the
embodiment of Fig. 1, the Al layer is located on the top of the
ribbon, while in Fig. 2 two A...