Ink jet type head for pigment type ink with different pulses applied to electrodes

An ink jet type head comprising:

• a plurality of ink ejection electrodes in a form of parallel strips formed on a base;
• an ink chamber for holding an ink of a pigment type on said base on which said ink ejection electrodes are provided;
• an opposite electrode disposed on an imaginary extension of said ink ejection electrodes and facing said ink ejection electrodes with a sheet disposed between said opposite electrode and said ink ejection electrodes;
• an ink ejection opening provided in said ink chamber and facing said opposite electrode;
• an electrophoresis electrode disposed in said ink chamber and serving to cause electrophoresis of charged color particles contained in said ink towards said ink ejection opening;
• a first ejection electrode included among said plurality of ink ejection electrodes;
• second ejection electrodes included among said plurality of ink ejection electrodes and provided adjacent to two sides of said first ejection electrode;
• and
• a voltage driving unit for applying an ejection voltage for ink ejection to said first ejection electrode, said voltage driving unit applying said ejection voltage effective to cause the ink to be ejected to said first ejection electrode and applying an auxiliary voltage ineffective to cause the ink to be ejected to said second ejection electrodes.