An inkjet head manufacturing method for an inkjet head that includes a head chip including; a nozzle ejecting ink; and a flow path substrate including an ink flow path which communicates with the nozzle and through which the ink flows, the method including; composite substrate manufacturing that is manufacturing a composite substrate including a plurality of regions which forms flow path substrates by being split; first protective film forming that is forming a first protective film on a surface of the composite substrate and an inner wall surface of the ink flow path; splitting that is splitting the composite substrate into the flow path substrates; and second protective film forming that is forming a second protective film on at least an exposed face in a split face of the flow path substrate generated in the splitting, the exposed face being exposed in a surface of the head chip.

There is provided a liquid jet head and a liquid jet recording device capable of increasing available ink types. The liquid jet head according to an embodiment of the present disclosure is provided with an actuator plate having a plurality of ejection grooves, a nozzle plate having nozzle holes communicated with the ejection grooves, and a nozzle guard having a rib adapted to support the nozzle plate, and a communication hole adapted to communicate each of the first nozzle holes and an outside with each other. The rib has contact with the nozzle plate at a position which fails to be opposed to an opening on the nozzle plate side of each of the ejection grooves.

A liquid ejection head is manufactured by forming on a substrate an energy generating element for ejecting a liquid, an integrated circuit for driving the energy generating element, a supply port for the liquid so as to penetrate through the substrate, an electrode for generating a liquid flow, and a flow path forming member having an ejection orifice for ejecting the liquid such that a flow path for the liquid is formed between the substrate and the flow path forming member. The electrode is formed over high and low of a stepped shape formed on the substrate in at least one step selected from the steps of forming the energy generating element, forming the integrated circuit and forming the supply port.

An ink jet head includes a nozzle plate substrate having a nozzle for ejecting ink toward a recording medium and an oil repellent film on a surface of the nozzle plate substrate, the surface facing the recording medium. The oil repellent film includes a fluorine compound having a first end and a second end, the first end having a bonding group bonded to the nozzle plate substrate, the second end having a perfluoroalkyl group, and the bonding group being bonded to a bonding group of an adjacent fluorine compound bonded to the nozzle plate substrate.

Provided herein are a jet hole plate, a liquid jet head, a liquid jet recording apparatus, and a method for manufacturing a jet hole plate that can achieve a long life. A jet hole plate according to an embodiment of the present disclosure is a jet hole plate for use in a liquid jet head. The jet hole plate includes a metal substrate having provided therein a plurality of jet holes. The metal substrate has a principal surface having outlets for the jet holes. The principal surface has a surface roughness (arithmetic mean roughness Ra) that is smaller in outlet edge regions of the jet holes than in surrounding regions around the outlet edge regions.

An ink jet head includes a piezoelectric member, a plurality of electrodes, a protective lamination layer, and a nozzle plate. The piezoelectric member has a plurality of grooves. The electrodes are provided along surfaces of the grooves. The protective lamination layer covers the electrodes. The nozzle plate is on the piezoelectric member and has a plurality of ejection nozzles that faces the plurality of grooves. The protective lamination layer includes an insulating layer and a first oxide layer laminated on each other. The insulating layer contains an organic material. An oxygen content of the first oxide layer is greater than an oxygen content of the insulating layer.

A liquid discharge head includes an actuator base, a case member, and a nozzle plate. The actuator base includes a plurality of grooves space from each other in a first direction. Each of the grooves extends in a second direction. The actuator base is formed of a piezoelectric ceramic material. The case member includes a frame portion spaced from the actuator base in the second direction. The frame portion has an end surface in the third direction that is level with an end surface of the actuator base in the third direction. The frame portion is formed of a ceramic material having aluminum titanate as a main component. The nozzle plate is contacting the end surface of the frame portion and the end surface of the actuator base.

An inkjet head includes a nozzle plate substrate having a nozzle for ejecting ink toward a recording medium, and an oil repellent layer on a surface of the nozzle plate substrate, the surface facing the recording medium. The oil repellent layer comprises a fluorine-based compound in which neighboring molecules are cross-linked in a direction parallel to the surface, and cross-links of the neighboring molecules are resistant to structural change when subjected to rubbing by an ink wiping blade.

A head chip capable of suppressing the degradation of the reliability, and a liquid jet head and a liquid jet recording device using the head chip are provided. The head chip includes an actuator plate having a plurality of ejection channels respectively communicated with nozzle holes and electrodes disposed on inner walls of the respective ejection channels, a bonded plate to be bonded to the actuator plate, and having a liquid contact surface which liquid entered the ejection channels has contact with, an adhesive layer disposed between the bonded plate and the actuator plate, and adapted to bond the bonded plate and the actuator plate to each other, and a protective film adapted to cover continuously from inner walls of the respective ejection channels to at least a part of the liquid contact surface via an end surface of the adhesive layer exposed on the ejection channel side.

A liquid discharge head includes a plurality of nozzles from which a liquid is discharged in a discharge direction, a plurality of individual chambers communicating with the plurality of nozzles, respectively, a common chamber communicating with each of the plurality of individual chambers, a drive element configured to change a volume of each of the plurality of individual chambers to discharge the liquid in the plurality of individual chambers from the plurality of nozzles, and a refrigerant channel through which a refrigerant flows, the refrigerant channel facing the common chamber via a partition in the discharge direction.