Patent ID: 7802872

Claim:
An ink jet printhead comprising: one or more ejection modules each including: a silicon chip having a front surface and a top surface, a plurality of heating elements arranged parallel to the top surface of the silicon chip, a plurality of ejection cells located above the heating elements, delivery channels to deliver ink to the ejection cells, a main distribution channel defined in the top surface of the silicon chip orthogonally to the delivery channels, the main distribution channel extending along the front surface of the silicon chip without interruptions, and a nozzle layer integrated with the top surface of the silicon chip, the nozzle layer including ejection nozzles located above the respective ejection cells, wherein the ejection nozzles are parallel to the heating elements and the top surface of the silicon chip; a support for mounting the module or the modules and which defines a feeding duct for the ink, the feeding duct being in fluid communication with the front surface of the silicon chip and the main distribution channel; a seal between the module or the modules and said support, the seal arranged to form a fluid seal between the feeding duct of the support and the ejection cells of the module or of the modules; and a plurality of ribs extending between the delivery channels and the main distribution channel, the ribs extending transversely to the main distribution channel to form a further distribution channel orthogonal to the main distribution channel, the ribs bearing against the nozzle layer; wherein there is one pair of ribs for each delivery channel or one pair of ribs for a plurality of delivery channels.