Electrode configuration for the print head of an electrolytic pr

Details Electrode configuration for the print head of an electrolytic pr Electrode configuration for the print head of an electrolytic pr

1983-04-01

1985-02-26

Tarcza, Thomas H.

Recorders

Electric recording

Electrochemical

346165, G01D 1506

Patent

active

045020639

ABSTRACT:
A print head for use in an electrolytic matrix printer is described. In this print head, predetermined ones of a plurality of electrodes are permanently grounded and are thereby forced to always function as cathodes. The remaining electrodes serve as print electrodes and, depending on the information needed during a given print cycle, either print or are not energized. These print electrodes, therefore, are constrained to always function as anodes. Fixing the function of the electrodes in the print cycle prevents reverse current flow in an electrode from print cycle to print cycle and placing the permanently grounded electrodes intersticially between and about the print electrodes to isolate them, in particular, further enhances this effect. This is particularly beneficial when using platinum print electrodes that form a protective passivation layer which is destroyed by the reverse current flow resulting from alternating electrode functions.

REFERENCES:
patent: 2830867 (1958-04-01), Kohn et al.
patent: 3470563 (1969-09-01), Starr, Jr.
patent: 3898674 (1975-08-01), Koch

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