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A printing ribbon for an electrothermal printing system which utilizes an inorganic resistive layer is described.
English (United States)
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Inorganic Resistive Layer for Electrothermal Printing
A printing ribbon for an electrothermal printing system which utilizes an
inorganic resistive layer is described.
The printing ribbon utilizes an inorganic resistive layer such as a cermet
material. One specific ribbon comprises a 70/30 SiO/Cr cermet having a
thickness of 1500 A on the aluminum side of a 0.2 mil aluminized MYLAR*
substrate. The composition is not limited to 70/30 SiO/Cr but, depending on the
method of deposition of the layer, may comprise a range of composition, say,
from 80/20 SiO/Cr up to 20/80 SiO/Cr, so long as the requirements for thickness
and resistivity are achieved.
Other materials may be used as well. For example, codepositing silicon
carbide or silicon nitride with some metals, such as nickel or chromium, yields
usable resistive layers. Semiconductors or mixtures of semiconductors and
metals can also be used.
Ribbons made with these inorganic materials require lower power
to print, produce greater thermal stability in the ribbon, and result
in fabrication processes more amenable to automation. In addition,
due to the much thinner ribbon, a greater printing capacity will
result from a
* Trademark of E. I. du Pont de Nemours & Co.