Ink jet print head having members with different coefficients of thermal expansion

摘要

An ink jet print head is disclosed which includes a metallic nozzle member having a plurality of nozzles through which fine particles of ink are jetted, and a ceramic ink pump member superposed on and bonded to the nozzle member. The ink pump member has a plurality of ink chambers formed behind the respective nozzles, and a plurality of piezoelectric/electrostrictive elements each disposed on a portion of the ink pump member opposite a respective ink chamber, for deforming the portion so as to change a pressure of the respective ink chamber, whereby the ink supplied to the ink chamber is jetted through the corresponding nozzle. The ink jet print head further includes a CTE (coefficient of thermal expansion) adjusting member superposed on and bonded to the nozzle member and/or the ink pump member, for reducing a stress which is applied to the ink pump member due to a difference between a coefficient of thermal expansion of the nozzle member and that of the ink pump member.