Patent ID: 8308454

Claim:
A fluid conveyance device comprising: a substrate made of a rigid material; and a disk-shaped piezoelectric element arranged in a bendable manner on the substrate; wherein a plurality of substantially circular concentric segment electrodes are provided on the piezoelectric element; a voltage application device is arranged to apply voltages to the segment electrodes such that the voltages are successively shifted in phase; the voltages are applied to the segment electrodes with the phases thereof shifted so as to produce a wavy ring deformation on the piezoelectric element and to move a pocket that is produced between the piezoelectric element and the substrate in a radial direction such that a fluid is conveyed between an outer substantially circular portion and a central portion of the substrate; the disk-shaped piezoelectric element is directly bonded to the substrate along only an outer substantially circular portion of the disk-shaped piezoelectric element; a first flow passage port is provided on the central portion of one of the substrate and the piezoelectric element; a second flow passage port is provided on the outer substantially circular portion of one of the substrate and the piezoelectric element or between the outer substantially circular portions of both of the substrate and the piezoelectric element; the first flow passage port and the second flow passage port are closed by the piezoelectric element and the substrate when no voltages are applied to the piezoelectric element; and the piezoelectric element and the substrate are in contact with one another at a periphery of the substrate.