To prevent the driving characteristics of a pressure room adjacent to the boundary of two adjacent actuator units from being different from other pressure rooms.
A group 57 of pressure rooms consisting of a plurality of pressure rooms 56 covered by an actuator unit 51 is brought nearer the central side in relation to a specified nozzle arranging direction than a plurality of nozzles 55 respectively communicating with a plurality of the pressure rooms 56 belonging to this group 57 of the pressure rooms, and are then arranged by narrower intervals than the nozzles 55 in relation to the specified direction. In addition, in the boundary region where two actuator units 51 adjoin each other, the separating distance of two pressure rooms 56 respectively belonging to two groups 57 of the pressure rooms covered by the two actuator units 51 and adjacent to the boundary, is larger than the interval of two nozzles 55 respectively communicating with two pressure rooms 56.
Makoto Suhara
Toru Kimura
Next Patent: DETECTING METHOD OF MISREGISTRATION AND PIEZOELECTRIC ACTUATOR