Patent ID: 8141983

Claim:
A liquid jet head comprising: a nozzle member having a plurality of nozzles for jetting a liquid therefrom; a flow path member forming at least a part of a liquid chamber communicating with each of the plural nozzles; and a pressure generating part for generating pressure that is applied to the liquid inside the liquid chamber; wherein the nozzle member and the flow path member are each formed by a metal material; wherein the metal material of the nozzle member has substantially the same composition as the metal material of the flow path member; wherein the metal material of the nozzle member includes crystal particles having an average particle diameter which is less than that of the crystal particles included in the metal material of the flow path member; wherein the nozzle member and the flow path member are integrally formed; and wherein the flow path member has a portion positioned toward an interface with the nozzle member, and the portion includes crystal particles having an average particle diameter which is substantially the same as that of the crystal particles of the nozzle member.