公开(公告)号：EP0126863B1

公开(公告)日：1991-06-12

申请号：EP84102326.0

申请日：1984-03-05

申请人： LEXMARK INTERNATIONAL, INC.

发明人： Acciai, Michael ,  Pigos, Charles Robert ,  Speicher, Charles Gerard

IPC分类号： G01D15/06 ,  B41J2/385

CPC分类号： G01D15/06

公开(公告)号：EP0126863A2

公开(公告)日：1984-12-05

申请号：EP84102326.0

申请日：1984-03-05

申请人： LEXMARK INTERNATIONAL, INC.

发明人： Acciai, Michael ,  Pigos, Charles Robert ,  Speicher, Charles Gerard

IPC分类号： G01D15/06 ,  B41J2/385

CPC分类号： G01D15/06

摘要： ( D A print head (40) for use in an electrolytic matrix printer includes a first plurality of electrodes (20) permanently grounded and always functioning as cathodes. A second plurality of electrodes (18) serve as print electrodes and, depending on the information needed during a given print cycle, either print or are not energized. These print electrodes 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. Placing the permanently grounded electrodes interstitially between and about the print electrodes to isolate them 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.