THERMOJET PRINTING HEAD Russian patent published in 1996 - IPC

FIELD: for means of communication and data recording on paper or other media. SUBSTANCE: the thermojet printing head has an electroinsulating base with film resistive heating elements and current-carrying electrodes positioned on its surface, chamber- forming plate with nozzles located against the film resistive heating elements and connected to the mentioned base, and reservoir with ink hydraulically connected to the film resistive heating elements; the film resistive heating elements have the same dimensions, shape and value of electric resistance, and when an electric pulse of a preset amplitude and duration passes through them, they provide for liberation of heat energy sufficient for ejection of a microdrop of ink from the nozzle; each film resistive heating element uses a group of n1 parallel-connected film resistors 15%, and the areas of the mentioned resistors are such that the specific heat energy liberation at least on one of them, for example on the first one, when an electric pulse passes through it will suffice to eject an ink microdrop, and, in case of a change of its area and electric resistance, the level of heat energy required for ejection of a microdrop is liberated on the heat, for example, on the second resistor and so on up to the last resistor in the group. EFFECT: improved design. 2 dwg