| 摘要 |
<p>Disclosed is a piezoelectric actuator (1) for an ultrasonic motor in the shape of a plate with two main surfaces (2), where at least one friction element (16) is arranged at one of said main surfaces, two longer side surfaces (3) running in the length direction of the plate and two shorter side surfaces (4) running in the width direction of the plate, the plate having at least three layers (5) of polarized piezoelectric material stacked in its thickness direction and at least one electrode layer (6) arranged at a main surface constituting outer electrodes (7) and at least two electrode layers (8) each arranged between two adjacent piezoelectric material layers and constituting inner electrodes (9), with the inner electrodes (9) comprising exciting electrodes (10) and common electrodes (11) and with the outer electrodes comprising exciting electrodes (10) and at least one common electrode (11), and with at least one exciting electrode having two first channel electrodes (12) and two second channel electrodes (13) with the first channel electrodes and the second channel electrodes alternately arranged along the length direction of the plate in a spaced manner and thus defining four separate sections (14) of the plate, each section representing a generator (15) for a standing wave, and with the polarization direction of adjacent piezoelectric material layers of each generator being opposite to each other.</p> |
