Piezoelectric inkjet printhead having unidirectional shutter

摘要

Provided is a piezoelectric inkjet printhead. The inkjet printhead includes a plurality of pressure chambers containing ink to be ejected, a plurality of piezoelectric actuators providing a driving force for ink ejection to the plurality of pressure chambers, a manifold containing ink to be supplied to the plurality of pressure chambers, a plurality of restrictors supplying ink from the manifold to the plurality of pressure chambers, a plurality of nozzles ejecting ink from the plurality of pressure chambers, and a plurality of unidirectional shutters each installed at an outlet of each of the plurality of restrictors and adapted to open the restrictor when ink is supplied from the restrictor to the pressure chamber and close the restrictor and prevent backflow of ink when ink is ejected from the pressure chamber through the nozzle. Therefore, since backflow of ink is prevented by the unidirectional shutter, the area of a vibration plate and the volume of the pressure chamber needed to eject ink droplets of uniform volume can be reduced, thereby increasing the number of channels per inch (CPI) of the piezoelectric inkjet printhead.