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Laminated Composite for Trailing Cathode in an Electrolytic Print Head

IP.com Disclosure Number: IPCOM000044503D
Original Publication Date: 1984-Dec-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 2 page(s) / 71K

Publishing Venue

IBM

Related People

Pigos, CR: AUTHOR [+2]

Abstract

Fig. 1 shows a platinum - organic print head electrode array which is intended for use in electrolytic printing. As the array is used to effect printing upon a recording medium, the insulation recedes from between the electrodes until a steady-state undercut value of approximately 3 microns is reached for this type of print head. Experience has demonstrated that the undercut must not exceed 3 microns, or print quality degrades below acceptable levels. A further problem encountered with the illustrated print head involves the trailing cathode which is etched in the anode's wake. Etching of the trailing cathode does not stop at a steady-state value for this type of print head, but continues until print quality degradation forces print head replacement.

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Laminated Composite for Trailing Cathode in an Electrolytic Print Head

Fig. 1 shows a platinum - organic print head electrode array which is intended for use in electrolytic printing. As the array is used to effect printing upon a recording medium, the insulation recedes from between the electrodes until a steady-state undercut value of approximately 3 microns is reached for this type of print head. Experience has demonstrated that the undercut must not exceed 3 microns, or print quality degrades below acceptable levels. A further problem encountered with the illustrated print head involves the trailing cathode which is etched in the anode's wake. Etching of the trailing cathode does not stop at a steady-state value for this type of print head, but continues until print quality degradation forces print head replacement. The etching of the trailing cathode can be eliminated if the platinum in the cathode is replaced with a composite of RuO2 (ruthenium dioxide) and an organic polymer, the composite using approximately 30% by volume of RuO2 . Unfortunately, this substitution increases undercut of the insulation to approximately 6 microns which degrades print quality and offsets the improvement obtained by the substitution of electrode material. However, if a composite of RuO2, a polymer and platinum is used, as illustrated in Fig. 2, the undercut is limited to less than 3 microns while etching of the trailing electrode is substantially curtailed or eliminated. To ac...