Inkjet head having laminated piezoelectric actuator
First Claim
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1. An inkjet head comprising:
- a cavity unit formed of a conductive material with a plurality of nozzles and a plurality of pressure chambers in fluid communication with the corresponding nozzles; and
an actuator including a plurality of sheet members laminated one on the other in a stacked direction, a plurality of drive electrodes corresponding to the pressure chambers, and a plurality of common electrodes, the plurality of drive electrodes and the plurality of common electrodes being arranged in alternation with respect to the stacked direction, each of the drive electrodes and the common electrodes being sandwiched between corresponding sheet members, wherein portions of the sheet members sandwiched between the drive electrodes and the common electrodes serve as active portions that selectively eject ink droplets from the corresponding pressure chambers through the nozzles, wherein projected contours of all the drive electrodes fall within a projected contour of one of the common electrodes disposed closest to the cavity unit with respect to the stacked direction.
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Abstract
A common electrode formed on the lowest piezoelectric sheet has a shape corresponding to drive electrodes, and lead-out parts of the common electrode have a shape corresponding to projecting parts of the drive electrodes. Because the common electrode formed on the lowest piezoelectric sheet is made large enough to include the projected contours in the horizontal plane of the drive electrodes together with their lead-out parts, the common electrode lies between the cavity plate and the drive electrodes nearest to the cavity plate. Therefore, the voltage applied to the drive electrode is restricted from leaking to the cavity plate.
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20 Claims
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1. An inkjet head comprising:
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a cavity unit formed of a conductive material with a plurality of nozzles and a plurality of pressure chambers in fluid communication with the corresponding nozzles; and
an actuator including a plurality of sheet members laminated one on the other in a stacked direction, a plurality of drive electrodes corresponding to the pressure chambers, and a plurality of common electrodes, the plurality of drive electrodes and the plurality of common electrodes being arranged in alternation with respect to the stacked direction, each of the drive electrodes and the common electrodes being sandwiched between corresponding sheet members, wherein portions of the sheet members sandwiched between the drive electrodes and the common electrodes serve as active portions that selectively eject ink droplets from the corresponding pressure chambers through the nozzles, wherein projected contours of all the drive electrodes fall within a projected contour of one of the common electrodes disposed closest to the cavity unit with respect to the stacked direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification