| 摘要 |
A piezoelectric body formed onto one surface of an insulation sheet of an aperture electrode, the piezoelectric body being in direct confrontation with a toner-bearing roller. The piezoelectric body is formed of a mixture of a binder and piezoelectric material particles provided by pulverizing a piezoelectric material mass. A plurality of apertures are formed through the insulation sheet and the piezoelectric body, and control electrodes are provided around each aperture. The piezoelectric body is deformable upon generation of an electrical field. In a first deformation of the piezoelectric body, the thickness of the piezoelectric body is increased to provide a dam at a downstream portion of the aperture, which facilitate the toner orientation toward the aperture.
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