Patent ID: 7533970
Filing Date: 2009-05-19
Classification: B41J

Abstract:
1. An inkjet printhead integrated circuit comprising: a plurality of nozzles, each nozzle defining a planar opening that is symmetrical about at least one axis; a bubble forming chamber corresponding to each of the nozzles respectively, the bubble forming chambers adapted to contain a liquid, the nozzle being formed in one wall of the bubble forming chamber and a liquid inlet formed in an opposing wall, with at least one side wall extending between the opposing walls; a heater element suspended within each of the bubble forming chambers such that heating the heater element to a temperature above the boiling point of the liquid forms a gas bubble that causes the ejection of a drop of the liquid through the nozzle; wherein, the heater element has a planar structure parallel to the plane of the nozzle and the heater element has a shape with at least one axis of symmetry parallel to the at least one axis symmetry of the nozzle; and, the spacing between the heater element and the side wall is between 0.1 microns and 20 microns.