Patent ID: 7717543
Filing Date: 2010-05-18
Classification: B41J,B82Y,G06F,G06K,G11C,H04N

Abstract:
1. An ink jet printhead comprising: a plurality of nozzles; a bubble forming chamber corresponding to each of the nozzles respectively, the bubble forming chambers adapted to contain a bubble forming liquid; a looped heater element disposed in each of the bubble forming chambers respectively, the heater elements configured for thermal contact with the bubble forming liquid; wherein heating of the looped heater element to a temperature above the boiling point of the bubble forming liquid forms a gas bubble that causes the ejection of a drop of an ejectable liquid through the nozzle corresponding to that heater element; and, a pair of electrodes for each of the heater elements respectively, the pair of electrodes in each of the bubble forming chambers being positioned adjacent each other such that the looped heater element provides a single current path between the electrodes of each pair; wherein, each looped heater element includes a plurality of double omega profiled sections which extend at least partially along an axis of the respective bubble forming chamber.