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(11) | EP 2 703 164 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Inkjet head |
| (57) Provided is an inkjet head which is of a shear mode type that a front end face of
each partition wall made of a piezoelectric material is joined to a nozzle plate,
the inkjet head being capable of improving a drop speed and performing stable drive
at a high speed by suppressing an influence of vibration energy at the time of a deforming
operation concentrating on the front end face of the partition wall. In an inkjet head 1 comprising: a head chip 10 in which a plurality of channels 12 and a plurality of partition walls 13 at least partially containing a piezoelectric material are alternately aligned and which exerts a pressure for discharging an ink in the channels 12 by a deforming operation of the partition walls 13 based on a drive voltage; and a nozzle plate 20 joined to a front end face of the head chip 10 through an adhesive, front end faces of the partition walls 13 facing the nozzle plate 20 through the adhesive, wherein the nozzle plate 20 has air groove portions 23 concaved from a joint surface of the head chip 10 at positions on the joint surface facing front end faces of the partition walls 13. |