Printhead having fluid supply through sealing film

Abstract

A printhead is provided having a printhead integrated circuit having ejection nozzles and fluid channels for supplying fluid to the nozzles, a support structure supporting the integrated circuit, the support structure having conduits for supplying fluid to the channels, and a sealing film fixing the integrated circuit to the support structure. The sealing film has apertures providing sealed fluid communication between the conduits and the channels. The channels are divided into isolated channel sections by walls. Each aperture of the sealing film is positioned at one of the walls so as to provide fluid communication to both of the channel sections either side of the respective wall.

What is claimed is:-: 
     
         1 . A printhead comprising:
 a printhead integrated circuit having ejection nozzles and fluid channels for supplying fluid to the nozzles;   a support structure supporting the integrated circuit, the support structure having conduits for supplying fluid to the channels; and   a sealing film fixing the integrated circuit to the support structure, the sealing film having apertures providing sealed fluid communication between the conduits and the channels,   wherein the channels are divided into isolated channel sections by walls, each aperture of the sealing film being positioned at one of the walls so as to provide fluid communication to both of the channel sections either side of the respective wall.   
     
     
         2 . A printhead according to  claim 1  wherein the sealing film is more than 25 microns thick. 
     
     
         3 . A printhead according to  claim 2  wherein the sealing film is more than 50 microns thick. 
     
     
         4 . A printhead according to  claim 3  wherein the sealing film is more than 100 microns thick. 
     
     
         5 . A printhead according to  claim 2  wherein the sealing film is about 200 microns thick. A printhead according to  claim 1  wherein the sealing film is a polymer laminate with a central support web between to outer layers of adhesive.