Surface layer to reduce contact resistance in resistive printing

Details Surface layer to reduce contact resistance in resistive printing Surface layer to reduce contact resistance in resistive printing

1985-12-09

1987-10-13

Wright, Jr., Ernest T.

Typewriting machines

Including interposed inking device for record-medium

Ribbon, per se

400120, 428913, 428914, 346 76R, B41D 3100

Patent

active

046995331

ABSTRACT:
An improved resistive ribbon for thermal transfer priting in which a coating is located on the resistive layer in order to reduce contact resistance between the ribbon and printhead, thereby reducing undesirable heating at the contact region between the ribbon and printhead. The coating is comprised of compositions selected from the group consisting of Cr-N, Sn-SnO, ITO, AlN and Al-Al.sub.2 O.sub.3, where the resistivity of the coating is significantly less than the resistivity of the resistive layer of the ribbon. Further, the sheet resistivity of the coating is greater than the sheet resistivity of the resistive layer. The rest of the resistive ribbon can be comprised of any combination of the usually employed layers, such as a current return layer, a release layer for facilitating the transfer of ink from the ribbon to a carrier, and the ink layer itself.

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IBM Technical Disclosure Bulletin, "Reduction of Contact Resistance in Resistive Ribbon Printing", vol. 28, No. 7, Dec. 1985, pp. 2977-2978.
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