Patent ID: 7588321
Filing Date: 2009-09-15
Classification: B41J

Abstract:
1. An inkjet printhead comprising: an array of nozzles; a chamber corresponding to each of the nozzles respectively; a heater corresponding to each of the nozzles, each heater having a heater element extending between a pair of electrodes, the heater element being suspended in the chamber by the electrodes for heating the printing fluid to form a vapour bubble to eject a drop of the printing fluid through the nozzle corresponding to that heater element; and, integrated circuit metalization layers corresponding to each of the nozzles, the metalization layers supplying electrical energy to the heater, the heater and the integrated circuit metalization layers are substantially planar and at least partially overlapping, the metallization layers electrically connected to the heater electrodes by vias, the cross sectional area of all the vias being greater than 50% of the surface area of one side of the heater.