Liquid jet head and liquid jet apparatus

摘要

A liquid jet head has spaced-apart side walls that form alternating ejection channels and non-ejection channels. The side walls comprise two piezoelectric materials polarized in opposite directions and laminated together with a polarization boundary interposed between them. Upper and lower members are fixed to respective upper and lower ends of the side walls and overlie upper and lower ends of the channels. Electrodes on opposed wall surfaces of the side walls extend from the upper ends of the side walls to either the vicinity of the polarization boundary or to below the polarization boundary and above the lower ends of the side walls. The polarization boundary is positioned above one-half the depth of the channels to improving the driving efficiency of the piezoelectric body.

主权项

1. A liquid jet head comprising:
a side wall disposed between an ejection channel that ejects liquid droplets and a non-ejection channel that does not eject liquid droplets, and in which two piezoelectric materials having mutually different polarization directions are laminated in a height direction, interposing a polarization boundary; an upper member fixed to an upper end of the side wall and installed on an upper portion of the channels; a lower member fixed to a lower end of the side wall and installed on a lower portion of the channels; and an electrode installed on a wall surface of the side wall, wherein the polarization boundary is positioned above ½ a depth of the ejection channel, and the electrode is installed from an upper end of the wall surface, to a vicinity of the polarization boundary, or below the polarization boundary and above a lower end of the wall surface.