An ink jet method and image recording head for jetting a liquid coloring agent, or ink, wherein there are provided a pair wall members with spaced-apart inner faces to contain the ink, the edges of the wall members forming a discharge opening on one side thereof; electrodes for applying an electric field...http://www.google.com.au/patents/US4710780?utm_source=gb-gplus-sharePatent US4710780 - Recorder with simultaneous application of thermal and electric energies
