Layered-type piezoelectric element and method for producing the layered-type piezoelectric element
AssigneeBrother Kogyo Kabushiki Kaisha
InventorsYasuo Okawa, Yasuji Chikaoka, Atsuo Sakaida, Yoshihumi Suzuki, Yoshiyuki Ikezaki
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Abstract
A stacked body is formed from alternating piezoelectric ceramic layers 40 and internal electrode layers 42, 44. At least a central portion of a stacked body is divided into a plurality of actuator portions 46a, 46b, and 46c by elongated holes 52 opened in the stacked direction. The portions are supported at their end portions by a piezoelectric non-active portion 48. Desired actuator portions can be driven independently by selectively applying voltage to the electrodes corresponding to the actuator portions 46a, 46b, and 46c.
Claims5
A layered-type piezoelectric element for producing a pressure fluctuation within a cavity of an ink jet print head to eject the ink from the cavity, the layered-type piezoelectric element comprising:
- piezoelectric ceramic layers;
- and
- internal electrode layers stacked in a stacked direction alternately with said piezoelectric ceramic layers to form a stacked body, the internal electrode layers including an odd-numbered electrode layer group and an even-numbered electrode layer group;
- wherein elongated holes that are elongated in an elongation direction perpendicular to the stacked direction extend in the stacked direction through a central portion of the stacked body, the elongated holes defining therebetween a plurality of actuator portions that extend in the elongation direction and that are attached at both ends in the elongation direction to other portions of the stacked body, portions of each layer of the odd-numbered electrode layer group being in opposition in the stacked direction with portions of each layer of the even-numbered electrode layer group at least at the actuator portions of the stacked body.
Dependencies are inferred from the claim text.