A liquid ejection head includes an ejection hole surface where a plurality of nozzles ejecting liquid open. The ejection hole surface includes a nozzle arrangement region where the plurality of nozzles are arranged. Each nozzle includes an inversely tapered part where a cross-sectional area increases toward the ejection hole surface. A first nozzle is arranged at a center part of a predetermined direction of the nozzle arrangement region, while second nozzles are arranged at the end parts at the two sides in the predetermined direction. When viewed from the ejection hole surface side as T, the width of the first nozzle's inversely tapered part is larger than the widths of the inversely tapered parts of the second nozzles. In the nozzle arrangement region, the ejection hole surface includes a shape that the center part in the predetermined direction projects with respect to the end parts on the two sides.

A head chip, a liquid jet head, and a liquid jet recording device which effectively transfer elastic energy to ink in a pressure chamber to increase pressure to be generated in the pressure chamber are provided. The head chip according to an aspect of the present disclosure includes an actuator plate provided with a pressure chamber in which a liquid is contained, a jet hole plate which has a jet hole communicated with the pressure chamber, and which is overlapped on the actuator plate in a thickness direction of the actuator plate, and a drive electrode which is configured to generate an electric field in the actuator plate to thereby deform the actuator plate in the thickness direction and a crossing direction crossing the thickness direction to expand or contract a volume of the pressure chamber.

A head chip, a liquid jet head, and a liquid jet recording device each capable of increasing the pressure to be generated while achieving an increase in manufacturing efficiency and yield ratio are provided. The head chip according to an aspect of the present disclosure includes a flow channel member provided with a pressure chamber containing a liquid, an actuator plate which is arranged on the flow channel member in a state of being opposed in a first direction to the pressure chamber, and a drive electrode configured to deform the actuator plate in the first direction to change a volume of the pressure chamber. A recessed part with respect to a first surface facing to the flow channel member in the first direction is formed in a portion of the actuator plate, the portion overlapping the pressure chamber when viewed from the first direction. The drive electrode includes a first electrode formed on an inner surface of the recessed part, and a first opposed electrode which is formed on an upper surface of the actuator plate so as to be opposed to the first electrode, and which is configured to generate a potential difference from the first electrode.

A head chip, a liquid jet head, and a liquid jet recording device each capable of effectively transferring the elastic energy to the ink in the ejection channel to obtain a desired ejection performance are provided. The head chip according to an aspect of the present disclosure includes an actuator plate in which jet channels and non-jet channels are alternately arranged, a side-surface common electrode formed on inner side surfaces opposed to each other in a second direction out of inner surfaces of the jet channel, a bottom-surface common electrode formed on a bottom surface facing to a first side in a thickness direction out of the inner surfaces of the jet channel, a first individual electrode which is formed on inner side surfaces opposed to each other in the second direction out of inner surfaces of the non-jet channel, and which is configured to generate a potential difference from the side-surface common electrode, and a second individual electrode which is disposed on an opposite surface facing to a second side in the thickness direction out of the actuator plate, and which is configured to generate a potential difference from the bottom-surface common electrode.

There are provided a head chip, a liquid jet head, and a liquid jet recording device which smoothly circulates ink between pressure chambers and a circulation channel to thereby prevent disappearance of a protective film to improve durability. The head chip according to an aspect of the present disclosure includes an ejection section, a jet hole plate, a return plate, a flow channel plate, and a protective film. A communication channel includes an upstream opening communicated with a channel opening which opens toward a first side in a first direction in a jet channel, a downstream opening communicated with a manifold opening which opens toward the first side in the first direction in the manifold, and a connecting part which extends in a third direction, and which is configured to connect the upstream opening and the downstream opening to each other. The return plate is bonded to the ejection section so that at least a part of an opening edge in the upstream opening is arranged at an outer side when viewed from the first direction with respect to an opening edge of the channel opening.

An object is to provide a laminated substrate, a liquid ejection head, and a method of manufacturing a laminated substrate which are capable of preventing a decrease in the yield of a manufacturing process due to the substrate getting broken and an organic resin material sticking out. To that end, a structure including an eave portion having an overhang with a predetermined length is provided on a predetermined surface of a first substrate so as to form a space between the structure and the predetermined surface, and a resin is filled in the space.

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.

There is provided a liquid jet head capable of obtaining an excellent jet characteristic. The liquid jet head is provided with an actuator plate having a plurality of channels extending in a first direction, the plurality of channels filled with liquid, a nozzle plate disposed so as to be opposed to the actuator plate, and having a plurality of nozzle holes at positions corresponding to the plurality of channels, the liquid filled in the plurality of channels being jetted from the plurality of nozzle holes in a second direction crossing the first direction, and an intermediate plate disposed between the actuator plate and the nozzle plate, and having a plurality of slits extending in the first direction at positions corresponding respectively to the plurality of channels and the plurality of nozzle holes, a width of each of the plurality of slits in a third direction crossing each of the first direction and the second direction being larger than a width of each of the plurality of channels in the third direction.

Provided herein is a method for manufacturing a jet hole plate that can improve ejection stability and head durability. A method for manufacturing a jet hole plate according to an embodiment of the present disclosure includes a punching step of pressing a first principal surface of a metal substrate with a punch to form an indentation in the first principal surface, and to form a raised portion in a second principal surface of the metal substrate at a position opposite to the indentation; a first polishing step of removing the raised portion by mechanical polishing to penetrate the metal substrate at the indentation to thereby form a jet hole; and a second polishing step of polishing at least one of the first principal surface and the second principal surface of the metal substrate by chemical polishing, electrolytic polishing, or chemical-mechanical polishing.

A liquid jet head capable of a stable jet operation is provided. The liquid jet head includes a liquid jet head chip adapted to jet liquid, a flow channel member having a flow channel adapted to guide the liquid to the liquid jet head chip, an adhesive layer adapted to bond the flow channel member and the liquid jet head chip to each other, and an elastic body softer than the adhesive layer and disposed between the flow channel member and the liquid jet head chip.