Patent ID: 8152283

Claim:
A liquid-jet head comprising: a passage-forming substrate provided with an individual path including a pressure-generating chamber communicating with a nozzle orifice which ejects a liquid; a pressure-generating element provided in a region facing the pressure-generating chamber on the side of a first surface of the passage-forming substrate; a protection plate which is joined to the first surface of the passage-forming substrate on the pressure-generating chamber side, and which is provided with a pressure-generating element holding portion having the pressure-generating element arranged therein on a first surface of the protection plate; a reservoir formed in a region on the opposite side of the first surface of the protection plate, the region overlapping the pressure-generating element holding portion in the thickness direction of the protection plate; a compliance plate formed in a region on a surface of the reservoir on the opposite side to the passage-forming substrate the region overlapping the pressure-generating element holding portion in the thickness direction of the protection plate; a through hole which is provided in a region in the protection plate on a first end side in the longitudinal direction of the pressure-generating chamber, and which causes the reservoir to communicate with the individual path; an introducing path, which is provided in a region in the compliance plate on a second end side in the longitudinal direction of the pressure-generating chamber, and which supplies the liquid to the reservoir from a storage having the liquid stored therein; and a flexible portion with flexibility provided in a region of the compliance plate, the region facing the reservoir, which region covers at least from a part facing the through hole to a part surrounding the introducing path; and a head case includes a recessed portion in a region facing the reservoir, wherein the recessed portion of the head case is sealed by the compliance plate.