A head chip, liquid jet head, and liquid jet recording device are described. An actuator plate is adapted to apply pressure to the liquid, and includes a first surface, and a second surface facing to an opposite side to the first surface, ejection channels and non-ejection channels which have an opening on the first and/or second surface and are alternately arranged to be separated from each other, a common electrode disposed on a sidewall of the ejection channel, an individual electrode electrically separated from the common electrode and disposed on a sidewall of the non-ejection channel, a common electrode pad disposed on the first surface and adapted to electrically connect the common electrode and a wiring board to each other, and a bypass interconnection adapted to electrically connect the individual electrodes in the non-ejection channels adjacent to each other and failing to be exposed on the first surface.

An ink jet head includes a nozzle plate base including a plurality of nozzles. A liquid repellent film is formed on a surface of the nozzle plate base. The liquid repellent film comprises a polymeric compound formed of repeating units with a cyclic structure. A portion of the repeating units with the cyclic structure are ring-opened.

A liquid ejection head includes an element substrate having an energy-generating element configured to generate an energy for ejecting a liquid from an ejection orifice, a support member for supporting the element substrate, the support member including a liquid chamber formed therein to supply the liquid to the ejection orifice, and a damper portion for absorbing vibration of the liquid inside the liquid chamber, the damper portion being flexible. The support member has a through-hole for communicating with the liquid chamber at a position located above the liquid chamber in a vertical direction when the liquid ejection head is in a use orientation. The damper portion has a taper portion that tapers downwardly in the vertical direction and is positioned in such a manner that the tapering portion closes the through-hole, and the damper portion and the support member are attached to each other by a fixing member.

An ink jet head includes a nozzle plate base including a plurality of nozzles. A liquid repellent film is formed on a surface of the nozzle plate base. The liquid repellent film comprises a polymeric compound formed of repeating units with a cyclic structure. A portion of the repeating units with the cyclic structure are ring-opened.

A liquid jet head chip capable of exerting a stable ejection performance is provided. The liquid jet head chip is provided with an actuator plate and an electrode. The actuator plate has an obverse surface, a reverse surface, and two or more ejection channels which penetrate the actuator plate in a thickness direction from the obverse surface toward the reverse surface, which are disposed so as to be adjacent to each other at intervals in a first direction perpendicular to the thickness direction, and which are disposed so as to extend in a second direction perpendicular to both of the thickness direction and the first direction. The electrode is disposed on an inner surface of the ejection channel, and includes a first electrode part covering the inner surface of the ejection channel continuously from the obverse surface toward the reverse surface, and a second electrode part covering the inner surface of the ejection channel continuously from the reverse surface toward the obverse surface, and overlapping at least a part of the first electrode part.

A liquid jet head chip capable of exerting a stable ejection performance is provided. The liquid jet head chip is provided with an actuator plate and an electrode. The actuator plate has an obverse surface, a reverse surface, and two or more ejection channels which penetrate the actuator plate in a thickness direction from the obverse surface toward the reverse surface, which are disposed so as to be adjacent to each other at intervals in a first direction perpendicular to the thickness direction, and which are disposed so as to extend in a second direction perpendicular to both of the thickness direction and the first direction. The electrode is disposed on an inner surface of the ejection channel, and includes a first electrode part covering the inner surface of the ejection channel continuously from the obverse surface toward the reverse surface, and a second electrode part covering the inner surface of the ejection channel continuously from the reverse surface toward the obverse surface, and overlapping at least a part of the first electrode part.

There are provided a head chip, a liquid jet head, and a liquid jet recording device capable of enhancing the reliability. An actuator plate adapted to apply pressure to the liquid, and a wiring board are provided. The actuator plate includes a first surface, and a second surface facing to an opposite side to the first surface, ejection channels and non-ejection channels which have an opening on at least one of the first surface and the second surface and are alternately arranged so as to be separated from each other, a common electrode disposed on a sidewall of the ejection channel, an individual electrode electrically separated from the common electrode and disposed on a sidewall of the non-ejection channel, a common electrode pad disposed on the first surface and adapted to electrically connect the common electrode and the wiring board to each other, and a bypass interconnection adapted to electrically connect the individual electrodes in the non-ejection channels adjacent to each other and failing to be exposed on the first surface.

A method for manufacturing a printing bar unit for a printing system includes the steps of providing a support bar having a plurality of primary mounting positions, providing a plurality of exchangeable printheads having a plurality of inkjet nozzles, and releasably mounting the printheads to the support bar. Preceding the step of releasably mounting the printheads to the support bar, a plurality of reference organs are connected at the primary mounting positions to the support bar and undergo an alignment finishing process for forming a plurality of accurate secondary mounting positions, and then in a subsequent step the printheads are releasably mounted to the secondary mounting positions on the reference organs. A dimensional tolerance of the secondary mounting positions on the reference organs relative to each other is more accurate than a dimensional tolerance of the primary mounting positions on the support bar relative to each other.

There are provided a head chip, a liquid jet head, a liquid jet recording device, and a method of manufacturing the head chip each capable of achieving a reduction in size in a direction perpendicular to the ejection direction while ensuring the desired ejection performance. The head chip according to an aspect of the present disclosure includes a first ejection section, a jet hole plate arranged at a first side in a first direction of the first ejection section, a return plate which has a plurality of first communication channels configured to individually communicate a plurality of first jet channels and a plurality of first jet holes with each other, and which is arranged between the first ejection section and the jet hole plate in the first direction, and a flow channel plate which has a plurality of first connecting channels individually communicated with the plurality of first communication channels to constitute first return channels together with the corresponding first communication channels, and a manifold communicated in a lump with the plurality of first connecting channels, and which is arranged at a second side in the third direction of the first ejection section.

A method for manufacturing a device for ejecting a fluid, including producing a nozzle plate including: forming a first nozzle cavity, having a first diameter, in a first semiconductor body; forming a hydrophilic layer at least in part in the first nozzle cavity; forming a structural layer on the hydrophilic layer; etching the structural layer to form a second nozzle cavity aligned to the first nozzle cavity in a fluid-ejection direction and having a second diameter larger than the first diameter; proceeding with etching of the structural layer for removing portions thereof in the first nozzle cavity, to reach the hydrophilic layer and arranged in fluid communication the first and second nozzle cavities; and coupling the nozzle plate with a chamber for containing the fluid.