Inkjet recording head

Abstract

An inkjet recording head, comprising: a channel unit (2), which has a plurality of pressure chambers (14) respectively communicating with a plurality of nozzles (20) along a reference plane, and each nozzle ejects small ink droplets; Electric actuators (3; 40; 50; 55; 60), which change the volume of any one of the pressure chambers, so that a corresponding nozzle ejects small ink droplets, wherein the piezoelectric actuators include: respectively corresponding to a plurality of pressure chambers A plurality of individual electrodes (32; 62), a common electrode (34; 44; 61) opposite each individual electrode, a piezoelectric layer (33; 63) interposed between the individual electrodes and the common electrode, and A plurality of electric wires (35; 65) respectively connected to a plurality of independent electrodes to respectively provide driving voltages to the independent electrodes, and wherein viewed from a direction perpendicular to the reference plane, connected to at least one first pressure chamber corresponding to the pressure chamber A portion (A; C) of at least one wire of at least one first individual electrode of the individual electrodes overlaps a portion (A; C) of at least one second pressure chamber of a pressure chamber different from the at least one first pressure chamber.

Description

[0001] This application is based on Japanese Patent Application No. 2004-169280 filed on June 8, 2004, the contents of which are incorporated herein by reference. technical field [0002] The present invention relates to an inkjet recording head that ejects ink to a recording medium and thereby performs recording on the medium. Background technique [0003] Patent Document 1 (Japanese Patent Application Laid-Open No. 2003-159798) or Patent Document 2 (Japanese Patent No. 3267937 and its corresponding US Patent No. 6471342) discloses an inkjet recording head which ejects ink to a recording medium and thereby Record on this medium. The disclosed inkjet recording head includes: a channel unit having a plurality of pressure chambers respectively communicating with a plurality of nozzles; and a piezoelectric actuator selectively changing the volume or volume of any one or more pressure chambers. respective volumes. The piezoelectric actuator includes a plurality of independent ...

AI Technical Summary

Problems solved by technology

Also, if the pitch of the supply wires is reduced, the production cost of the piezoelectric actuator is increased, the yield thereof is also reduced, and the reliability of the wires to be electrically connected to the individual electrodes to provide a driving voltage thereto is reduced.

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