Patent ID: 6439702
Filing Date: 2002-08-27
Classification: B41J

Abstract:
An inkjet printing head comprising:(a) a nozzle layer defining a plurality of ejection nozzles; (b) a cavity layer having a plurality of apertures, each aperture being positioned to correspond to one of said ejection nozzles so as to at least partially define a corresponding ink cavity; and (c) an ink supply layer having a front surface associated with said nozzle layer and a rear surface associated with said cavity layer, said ink supply layer being formed with a plurality of connecting bores from said rear surface to said front surface, each connecting bore being aligned so as to connect between a corresponding one of said ink cavities and a corresponding one of said ejection nozzles, wherein said ink supply layer is formed from a porous material having a multitude of small interconnected pores so as to allow passage of ink therethrough, wherein said ink supply layer additionally features: (i) a pattern of ink distribution channels formed in said front surface, and (ii) at least one ink inlet bore passing from said rear surface to said front surface and configured so as to be in direct fluid communication with at least part of said pattern of ink distribution channels, said pattern of ink distribution channels and said at least one ink inlet bore together defining part of an ink flow path which passes from said rear surface through said at least one ink inlet bore to said pattern of ink distribution channels on said front surface, and through said porous material to said plurality of ink cavities.