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Proceedings Paper

Forty dot/millimeter resistive ribbon thermal print head
Author(s): Ramon Lane; Richard A. John
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Paper Abstract

A key element to printing high resolution grey level images using resistive ribbon thermal printing technology, is the ability to fabricate a high density electrode print head. To print at 40 dots/mm resolution, the print head electrodes have to be on 25 im centers. Each electrode having a width of 15 to 17 /im. Wet etching techniques can not etch such structures in 25 thick tungsten. A reactive ion etching process suitable for manufacturing high resolution print heads from a tungsten sheet has been developed. Various system parameters were studied, such as gas mixtures, system vacuum pressure and applied RF power, with the goal of achieving an optimum etching process. The results identified SF6 based gas mixtures as the most suitable candidate for high volume removal of tungsten with an acceptable etch rate and edge profile. To study the print quality at 40 pel/mm, other parameters such as ink ribbon and paper surface finish were also investigated. An ink layer thickness and a paper were selected to match the quality of the high resolution print head. The electric power requirements to print single pel features repeatedly was studied.

Paper Details

Date Published: 1 May 1990
PDF: 10 pages
Proc. SPIE 1252, Hard Copy and Printing Technologies, (1 May 1990); doi: 10.1117/12.19779
Show Author Affiliations
Ramon Lane, IBM/Thomas J. Watson Research Ctr. (United States)
Richard A. John, IBM/Thomas J. Watson Research Ctr. (United States)

Published in SPIE Proceedings Vol. 1252:
Hard Copy and Printing Technologies
Ken-Ichi Shimazu, Editor(s)

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