Patent ID: 7140723

Claim:
A micro-electromechanical device that comprises a substrate; a drive circuitry layer positioned on the substrate; an electrode positioned on the drive circuitry layer; a nozzle chamber wall and a roof wall positioned on the substrate to define a nozzle chamber above the substrate and a fluid ejection port in the roof wall; a substantially planar deformable fluid ejecting member interposed between the electrode and the roof wall and configured to deform cyclically under action of a pulsed electromagnetic field, the drive circuitry configured to generate said pulsed electromagnetic field so that the fluid ejecting member acts on fluid to eject fluid from the fluid ejection port; a projection positioned on at least one of the fluid ejecting member and the substrate to inhibit sticking of the ink ejecting member to the substrate; and, complementary layers of hydrophobic material are positioned on the ink ejecting member and the substrate to inhibit sticking of the ink ejecting member to the substrate.