Patent ID: 6886925
Filing Date: 2005-05-03
Classification: B41J

Abstract:
1. A porous back-shooting inkjet print head module combined to an ink cartridge for receiving an external pulse voltage and ejecting ink from the ink cartridge, the porous back-shooting inkjet print head module comprising: a substrate, which has at least one nozzle; an ink supply plate, one side of which is connected to the ink cartridge, the other side has an accommodation space and covers the upper area of the nozzle of the substrate, forming a sealed ink chamber in connection with the nozzle, the ink supply plate above the ink chamber is made a porous material so that ink inside the ink cartridge permeates through the porous material into the ink chamber; a heating layer, which is installed around the nozzle of the substrate inside the ink chamber; a conductor layer, which is in electrical communications with the heating layer, receives and passes the pulse voltage to the heating layer for generating heat, the heat producing thermal bubbles in the ink chamber and the instantaneous pressure increase of which ejects ink out of the nozzle; and an insulator layer, which is installed above the conductor layer for preventing the ink from direct contact with the conductor layer, wherein the ink supply plate has an ink supply layer and an adhesion layer connected together, the adhesion layer having an annular structure to form the accommodation space.