Misalignment of printing positions between print heads associated with thermal expansion is reduced without increasing a data processing load. To this end, printing element substrates in a reference head and an adjustment target head are adjusted to a target temperature, and a liquid is circulated through the print element substrates. After thermal expansion of the reference head and the adjustment target head reaches a steady state, a first printing region being a printing region of the reference head and a second printing region being a printing region of the adjustment target head in a longitudinal direction are obtained from an image printed by using all printing elements. Then, used regions to be used for actual printing are set among the printing elements arranged on the reference head and the adjustment target head based on the first printing region and the second printing region.

A recording apparatus includes: a liquid ejection head including a heating element, a first protection layer that blocks contact between the heating element and liquid, a second protection layer that covers at least a portion of the first protection layer to be heated by the heating element and that functions as a first electrode, a second electrode that is electrically connected to the first electrode through the liquid, an ejection port that ejects the liquid, and a temperature detection element that corresponds to the heating element, and a detection unit configured to detect a feature point in a temperature curve that indicates a relationship between time and temperature, in which a combination of a potential set for the first electrode and a potential set for the second electrode in a case where printing is performed varies from that in a case where the detection unit detects the feature point.

A liquid ejecting apparatus includes a head unit having heads that configure to eject a liquid in a first-direction, and in which a second-direction orthogonal to the first-direction is a short direction and a third-direction orthogonal to the first and second-directions is a longitudinal direction, and a holding member. The head unit has a first-head, a second-head adjacent to the first-head, and disposed in the second-direction, and a third head adjacent to the second-head, and disposed in the second-direction. The first head has a first-gripping portion provided on an upper surface. The second-head has a second-gripping portion provided on the upper surface. The third-head has a third-gripping portion provided on the upper surface. A position of the second-gripping portion with respect to the third-direction is different from positions of the first-gripping portion and the third-gripping portion with respect to the third-direction.

A liquid ejecting head includes: multiple head chips; a first board that is a rigid board coupled to multiple flexible boards mounted on the respective head chips; and a second board that is disposed opposite the head chips with the first board therebetween and that is a rigid board provided with a connector. The first board has a first and second board-to-board connectors; the second board has a third and fourth board-to-board connectors. The first board-to-board connector mates with the third board-to-board connector so that the first board-to-board connector is coupled to the third board-to-board connector. The second board-to-board connector mates with the fourth board-to-board connector so that the second board-to-board connector is coupled to the fourth board-to-board connector. The connector is electrically coupled to both the third and fourth board-to-board connectors.

A liquid ejection head with which print of good print quality can be obtained and a method of manufacturing the liquid ejection head are provided. For that purpose, warped flow path members are joined to each other as flow path members used for a print head to form a flow path member warped in a direction opposite to a direction of warpage due to a temperature rise during printing.

In some examples, a print bar fabrication method comprises placing printhead dies face down on a carrier, placing a printed circuit board on the carrier, wire bonding each printhead die of the printhead dies to the printed circuit board, and overmolding the printhead dies and the printed circuit board on the carrier, including fully encapsulating the wire bonds.

A liquid ejection head includes a recording element substrate having a substrate provided with a plurality of flow paths for liquid to be ejected on a recording material by a recording element and a cover member that is provided with a plurality of communication holes in communication with the plurality of flow paths and that is joined to the substrate, a liquid supply member supplying the liquid to the plurality of flow paths through the plurality of communication holes of the cover member, and an adhesive member adhering the cover member and the liquid supply member. At least a part of an abutment region of the cover member in abutment against the substrate and apart from a region provided with the plurality of communication holes has a cover member opening for contacting the adhesive member and the substrate to each other.

A holder assembly that holds a head module including an inkjet head on a mounting table, the holder assembly including a pressure member and an operation member. The pressure member presses a portion of the head module adjacent to the mounting table. The operation member transitions the pressure member from a first state to a second state when work of mounting the head module on the mounting table is performed. In the first state, the pressing by the pressure member is deactivated, and in the second state, the pressing by the pressure member is activated. The operation member exists outside an enveloping surface of the head module during the work of mounting the head module on the mounting table.

A liquid ejecting head configured to eject a liquid in a first direction includes an upper surface facing a direction opposite to the first direction, and a gripping portion provided on the upper surface to grip the liquid ejecting head.

A liquid jet device includes a head body configured to jet droplets from a nozzle, a frame at which the head body is positioned, a grounding portion configured to contact a first side surface of the head body in a removal direction from the frame to electrically couple the head body to the frame, and a first pin serving as a pin for positioning the head body with respect to the frame, wherein a contact position between the first side surface and the grounding portion and a position of the first pin overlap in a normal direction of the first side surface.