| 摘要 |
A piezoelectric device for applying pressure to ink within a plurality of ink chambers formed in an inkjet head to control ejection of the ink, the piezoelectric device being mounted on a plate body of the inkjet head on which the plurality of ink chambers and a plurality of peripheral portions are alternately arranged, the piezoelectric device having: a base piezoelectric layer whose underside is fixed onto the plate body, and covering over the ink chambers and the peripheral portions, the base piezoelectric layer being polarized in a direction of its thickness; an electric field applying device for applying an electric field to the base piezoelectric layer, a direction of the electric field intersecting a polarization direction of the base piezoelectric layer; and a plurality of piezoelectric members arranged on an upside of the base piezoelectric layer, and located at positions corresponding to the ink chambers respectively, each of the piezoelectric members having a plurality of piezoelectric layers and a plurality of electrode layers, the piezoelectric layers and the electrode layers being alternately laminated, each of the piezoelectric layers being polarized in a direction of its thickness such that respective polarization directions of the piezoelectric layers are reversed for each of the piezoelectric layers.
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