Actuator unit for ink jet recording head

A multi-layer ink jet type recording head comprising:

• a diaphragm made of ceramic material;
• a spacer member made of ceramic material having therein a plurality of through holes forming pressure chambers;
• first electrodes formed on one surface of the spacer member so as to situate above each of the pressure chambers;
• piezoelectric transducers formed on the first electrode;
• a second electrode formed on the piezoelectric transducers so as to electrically connect the respective piezoelectric transducers with each other;
• and
• a third electrode for electrically connecting an external device and the second electrode, the third electrode mounted on the surface on which the first electrodes are mounted.

A multi-layer ink jet type recording head comprising:

• a pressure generating unit comprising a plurality of pressure chambers and actuator for increasing pressure in the pressure chambers;
• a flow path unit comprising:
• a nozzle plate member having nozzle openings formed therein;
• an ink supplying member to which ink is supplied from an ink supply inlet member to which the ink supplying member is directly connected, the ink supply inlet member extending in a direction perpendicular to the ink supplying member, the ink supplying member having first through holes formed therein through which the pressure chambers are communicated with the nozzle openings;
• and
• a spacer member having a reservoir and second through holes through which the pressure chambers are communicated with the nozzle openings, wherein the reservoir is communicated with the pressure chambers;
• wherein the pressure chambers are communicated with the nozzle openings via the first through holes in the ink supplying member and through the second through holes in the spacer member;
• the ink supplying member, the spacer member and the nozzle plate member being integrally connected to one another in such a manner that the ink supplying member is fixedly placed on one surface of the spacer member and the nozzle plate member is fixedly placed on the other surface of the spacer member;
• and
• a thermally fusible film having a specific preformed shape, for integrally joining an outer surface of the pressure generating unit to an outer surface of said ink supplying member.

A multi-layer ink jet type recording head comprising:

• a diaphragm;
• a spacer member having therein a plurality of through holes forming pressure chambers;
• first electrodes formed on one surface of the spacer member so as to situate above each of the pressure chambers;
• piezoelectric transducers formed on the first electrodes;
• a second electrode formed on the piezoelectric transducers so as the electrically connect the respective piezoelectric transducers with each other;
• and
• a third electrode for electrically connecting an external device and the second electrode, the third electrode mounted on the surface on which the first electrodes are mounted.