Patent ID: 7510270
Filing Date: 2009-03-31
Classification: B41J

Abstract:
1. An ink jet printhead comprising: a plurality of nozzles; a bubble forming chamber corresponding to each of the nozzles respectively; a plurality of heater elements disposed in each of the bubble forming chambers respectively, each heater element configured for thermal contact with a bubble forming liquid; such that, heating each 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 associated nozzle; wherein, each heater element is an elongate strip suspended between corresponding electrodes on opposite sides of the bubble forming chamber, each strip having a cross section with a lateral dimension at least triple that of the thickness of that strip and different than a lateral dimension of each other strip, the thickness of each strip being less than 0.3 microns, and the heater elements and associated electrodes are arranged so that the electrodes are non-coincident with the electrodes of the other heater elements.