Patent attributes
A method of ejecting drops of an ejectable liquid from a printhead that has a plurality of nozzles, and a bubble forming chamber corresponding to each of the nozzles respectively. The bubble forming chambers contain a bubble forming liquid and at least one heater associated with each of the bubble forming chambers respectively. The heater has electrodes for connection to a power supply and heater elements configured for thermal contact with the bubble forming liquid. The heater element is supported within the bubble forming chamber by the electrodes such that it does not contact the bubble forming chamber. The method uses the steps of placing the bubble forming liquid into thermal contact with the heater elements, and heating the heater elements to a temperature above the boiling point of the bubble forming liquid to form a gas bubble such that a drop of an ejectable liquid is ejected through the corresponding nozzle.
