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A printhead for electrochemical printing uses capillary action to achieve uniform wetting of a print zone with printing fluid.
English (United States)
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100% of the total text.
Page 1 of 2
A printhead for electrochemical printing uses capillary action to achieve
uniform wetting of a print zone with printing fluid.
Referring to Fig. 1, an array of capillary tubes 10 is interspersed with printing
anodes. The capillary tubes 10 are preferably fine glass tubes that are plated on
the inside wall 14 (Fig. 2) with a conducting material, such as gold or nickel, to
permit their use as a printing cathode in addition to applying printing liquid
(arrows indicate flow direction).
One possibility for producing the anode 12 is to use glass capillary tubes 16
that are filled at the printing end with conducting electrode material 18 such as
ruthenium dioxide. Contact is then made to the electrode material 18 through the
capillary tube 16.
A desired permanent relative positioning of cathodes 14 with respect to the
anodes 12 may be achieved by molding the capillary tubes 10 and 16 into a rigid
blocklike support 20 (Fig. 3).
Page 2 of 2
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