| 摘要 |
An actuator comprises a laminate of interleaved layers of electrode plates a nd piezoelectric material; wherein an upper region (in use) of electrode plates is adapted when energised to effect deflections in up and down directions; a lower region of electrode plates is adapted when energised to effect deflections in up and down directions; and one or more further regions of electrode plates are adapted when energised to effect deflections in left an d right directions.
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