Drop On Demand Ink Jet Printing Head
Original Publication Date: 1981-Sep-01
Included in the Prior Art Database: 2005-Feb-12
In typical drop-on-demand printer heads, the excitation of a piezoelectric crystal, which forms one wall of the head, causes a decrease in the volume of a chamber, forcing an ink droplet out of an orifice or nozzle end of the head. In this manner, each excitation produces one drop. Typically, however, the chamber in which the piezoelectric crystal resides requires some kind of rear impedance to fluid flow from the ink supply because as the piezoelectric crystal excites the fluid within the chamber, ink is forced towards the ink supply line as well as out the nozzle. A rear impedance device is illustrated in the drawing.