Electroosmotic ink printer head.

摘要

An electroosmotic ink printer head comprising a dielectric support (10) having a surface defined by front and rear sides and a pair of opposite ends. An array of first electrodes (20) is successively arranged on said surface extending rearward from the front side of the support. A porous member (40) is provided to overlie the first electrodes in contact with said surface. On the porous member is a second, liquid-permeable electrode (50) on which is provided a means for supplying ink to the porous member. To keep the front edge of the support dry a third electrode (30) is located adjacent to each outermost one of the first electrodes and to the longitudinal front edge. A potential is applied to the third electrode with respect to the second electrode to cause the ink in the porous member (40) to electroosmotically move in a direction from the third electrode to the second electrode (50). The ink which might wet the front edge of the support is therefore pulled rearward by the electroosmotic movement.