Patent ID: 6799838
Filing Date: 2004-10-05
Classification: B41J

Abstract:
A liquid discharge head comprising a heat generating element contacted with and between a pair of electrodes for generating thermal energy which is used for discharging liquid from a discharge port, and a protective film provided on said heat generating element to protect said heat generating element,wherein said protective film has a first region provided between said pair of electrodes, said first region having a substantially uniform thickness along a direction connecting said pair of electrodes, and has a second region provided between said pair of electrodes, said second region having a substantially uniform thickness along the direction, wherein said second region is thinner than said first region stepwise and is disposed asymmetrically only on a side of said discharge port between said pair of electrodes along the direction, wherein the volume of a liquid droplet discharged from said discharge port is changed by changing electric energy applied to said heat generating element, and wherein said protective film is composed of plural protection layers, said first region having more layers than said second region.