Selective Enlargement of Printhead Electrodes
Original Publication Date: 1985-Apr-01
Included in the Prior Art Database: 2005-Feb-18
In resistive ribbon printing, a column of electrodes in a printhead contacts the back of the ribbon and drive current selectively into the ribbon. The current generates heat within the ribbon to cause flow in an outer ink layer. Electrodes more frequently used, such as those positioned at the crossbar location of printing in a given typestyle, experience greater wear. The wear causes crooked vertical lines in printing. This can be offset by fabricating the printhead with those electrodes being of vertical height greater than the others. The electrodes less subject to wear are made correspondingly shorter, so that the overall height of the column of electrodes is not changed. Those electrodes widened are selected to conform to the most used areas of the particular font design and language to be employed.