Patent ID: 6312108
Filing Date: 2001-11-06
Classification: B41J

Abstract:
An electrostatic ink-jet head comprising:At least one nozzle;at least one liquid chamber including ink in fluid communication with each nozzle;at least one diaphragm, each diaphragm functionally associated with a nozzle, wherein the diaphragm is deformable so as to allow ink to flow into the at least one liquid chamber when the diaphragm is in a deformed state, and to pressurize the ink in the liquid chamber when the diaphragm returns to a restored state,and is capable of changing from the deformed state to the restored state in which a restoration force is imparted to the liquid chamber to fire ink therefrom; andat least one electrode, each electrode opposite to and functionally associated with a diaphragm, and arranged such that an electrostatic force is produced between the diaphragm and the electrode causing the diaphragm to be deformed, the ink in the chamber being pressurized and fired by the restoration force of the diaphragm, wherein the electrode comprises a diffused layer in a Si substrate and at least one active device is provided in the Si substrate, the active device defining a driving circuit, configured and adapted to store an electric charge on the electrode, thereby producing the electrostatic force used to deform the diaphragm.