PRINT HEAD FOR INK JET PRINTER

PURPOSE:To improve response of ink delivery and to make it possible to apply a print head on high speed printing by arranging a spacer composed of a material having lower compressibility than ink, e.g. glass or ceramic, in the pressure chamber of the print head in a piezoelectric ink jet printer. CONSTITUTION:Grooves 31-33 and barriers 51, 52 for forming a plurality of pressure chambers are made in a piezoelectric substrate 1 and a cover 6 is applied thereon through an elastic member 9. The barriers are polarized in the arrow direction and electrodes 41-43 are provided on the inner face of the grooves 31-33. Furthermore, a common groove 81 for feeding ink is made while being communicated with one ends of the grooves 31-33 so that ink can be introduced from the outside. The other ends of the grooves 31-33 are opened to one end face of the substrate 1 and a nozzle plate 60 is fixed to close the opening. In such print head, a glass spacer 95 is arranged in each pressure chamber(31-33) with a slight dimensional margin in order to increase the volume variation rate of ink.