Patent ID: 7845765
Filing Date: 2010-12-07
Classification: B41J

Abstract:
1. An inkjet printhead comprising: an array of nozzles arranged in a series of rows, each nozzle having an ejection aperture, a chamber for holding printing fluid and a heater element for generating a vapor bubble in the printing fluid contained by the chamber to eject a drop of the printing fluid through the ejection aperture; wherein, the nozzle, the heater element and the chamber are all elongate structures that have a long dimension that exceeds their other dimensions respectively; and, the respective long dimensions of the nozzle, the heater element and the chambers are parallel and extend normal to the row direction wherein the array of nozzles is formed on an underlying substrate extending parallel to the roof layer and the chamber is partially defined by a sidewall extending between the roof layer and the substrate, the side wall being shaped such that its interior surface is at least partially elliptical.