A nozzle arrangement for an ink jet printhead includes a wafer substrate having a nozzle chamber defined therein. The nozzle arrangement has a nozzle chamber wall that defines an ink ejection port and a rim about the ink ejection port. A series of radially positioned actuators are connected to the wafer...http://www.google.es/patents/US6247790?utm_source=gb-gplus-sharePatente US6247790 - Inverted radial back-curling thermoelastic ink jet printing mechanism
