Patent ID: 7210768
Filing Date: 2007-05-01
Classification: B41J

Abstract:
1. An ink jet printhead comprising: a plurality of nozzles, each defining a nozzle aperture with a nozzle axis extending through the center of the nozzle aperture and normal to the nozzle aperture; an ejectable liquid inlet for establishing fluid communication between the nozzle aperture and an ejectable liquid supply, the inlet having a central axis substantially parallel to, and laterally offset from, the nozzle axis; a bubble forming chamber corresponding to each of the nozzles respectively; at least one heater element disposed in each of the bubble forming chambers respectively, the heater element configured as a suspended beam extending between opposing sides of the bubble forming chamber for thermal contact with a bubble forming liquid; such that, heating the 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 the ejectable liquid through the nozzle corresponding to that heater element; wherein, the heater element is configured to nucleate the gas bubble at a point that is laterally offset from the inlet.