Printhead assembly with ink delivery assembly carrying data and power board

1. A printhead assembly for an inkjet printer, the assembly comprising

an elongate carrier;

a number of printhead modules mounted on the carrier, each including an ink delivery assembly and a printhead integrated circuit mounted on the ink delivery assembly, at least one ink delivery assembly also including an extrusion of a plastics material positioned on a floor of the channel member, the extrusion defining a number of longitudinally extending ink conduits, portions of the flexible printed circuit board assemblies and the busbars being interposed between the floor of the channel member and the extrusion;

flexible printed circuit board assemblies attached to the carrier and to respective printhead modules for carrying data and power to said modules; and

a pair of busbars electrically connected to the flexible printed circuit board assemblies for carrying power to the flexible printed circuit board assemblies.

2. A printhead assembly as claimed in claim 1 , in which the elongate carrier is a channel member, the printhead modules being mounted in the channel member.

3. A printhead assembly as claimed in claim 2 , in which each flexible printed circuit board assembly includes a fine pitch flexible printed circuit board connected to the respective printhead integrated circuit and a further flexible printed circuit board that interconnects the busbars and the respective fine pitch flexible printed circuit board.

4. A printhead assembly as claimed in claim 3 , in which the flexible printed circuit boards are interposed between respective ink delivery assemblies and inner surfaces of the channel member.

5. A printhead assembly as claimed in claim 1 , in which each printhead integrated circuit is mounted on an ink distribution assembly of the ink delivery assembly, the ink distribution assembly being configured to define a plurality of tortuous ink passages from the ink conduits to the printhead integrated circuit to distribute ink to the printhead integrated circuit.

6. A printhead assembly as claimed in claim 5 , in which each ink distribution assembly includes an outer ink distribution structure and an inner ink distribution structure interposed between the outer ink distribution structure and the extrusion.

7. A printhead assembly as claimed in claim 6 , in which each outer ink distribution structure defines a recess in which the respective printhead integrated circuit is positioned, the tortuous passages defined by the outer ink distribution structure opening into the recess.

8. A printhead assembly as claimed in claim 6 , in which the inner and outer distribution structures are micro-moldings of a liquid crystal polymer.