| 摘要 |
An ink jet printer head, including a cavity unit having a plurality of ink ejection nozzles arranged in at least one array, and a plurality of pressure chambers arranged in at least one array and communicating with the ink ejection nozzles, respectively; and an actuator having a plurality of active portions each of which is driven to change a pressure of an ink accommodated in a corresponding one of the pressure chambers, and thereby eject, from a corresponding one of the ink ejection nozzles, a droplet of the ink. The cavity unit and the actuator are stacked on each other. The cavity unit is constituted by a plurality of sheet members which are stacked on each other and which include a base sheet having the pressure chambers; at least one manifold sheet which has at least one manifold chamber storing the ink supplied from an ink supply source and delivering the ink to each of the pressure chambers, at a location where the at least one manifold chamber is at least partly opposed to the each pressure chamber in a direction of stacking of the sheet members; at least one spacer sheet which is interposed between the base sheet and said at least one manifold sheet; and a nozzle sheet having the ink ejection nozzles communicating with the pressure chambers. The at least one spacer sheet has a first rigidity higher than a second rigidity of the sheet members other than the at least one spacer sheet.
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