Compact ink jet head with deformable structure for ink discharge with great force

摘要

An ink jet head (10), having a long life, capable of discharging ink with a strong force and at a high speed is provided at small size. A container (6) comprises a casing (5) and a nozzle plate (7) covering the upper surface of the casing (5) and having an ink discharge opening (7a). A buckling structure (1) is fixed at its both longitudinal ends to the bottom surface of the container (6) via an installing member (3) and its center portion can be deformed upward by buckling. A diaphragm (2) is positioned above the buckling structure (1) with a space therebetween and placed on an inner wall of the casing (5) with its periphery fixed thereto so as to liquid-tightly partition the inside of the container (6) into a space on the structure-provided side and an ink chamber and deformable upward. A connection member (4) connects the diaphragm (2) and the buckling structure (1) at their center. Electrode (1a, 1b) are provided at both end of the buckling structure (1) to generate thermal stress therein by supplying electric current for buckling and consequently to apply pressure to ink (100) in the ink chamber for discharging.