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IBM Journal of Research and Development  
Volume 29, Number 5, Page 519 (1985)
SELECTRIC Systems/2000
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Electrical properties of resistive ribbon

by K. K. Shih, D. B. Dove
In resistive ribbon thermal transfer printing, a printhead consisting of an array of electrodes passes current into a thin ribbon to generate heat for transferring ink to paper. The ribbon is made of a polymeric material containing carbon black so as to be conducting, and has aluminum deposited on one side of the ribbon for a base contact. In this paper, the electrical conduction processes within the ribbon are discussed. Current-voltage measurements have been made with electrodes of various types in order to separate effects due to contact resistance, aluminum/resistive ribbon interfacial resistance, and bulk conduction in the resistive ribbon. Measurements have been made over a range of frequency and temperature to determine the basic conduction mechanisms. A model of conduction is presented that is in qualitative agreement with the data.
Related Subjects: Materials; Printing technology; Printing, thermal transfer; Typewriter design