Editorial: Special Issue on Robotics: Science and Systems 2005

The ink ejecting parts of an electrostatic ink jet printing head are formed in conical pointed needle shapes protruding from an orifice plate and an orifice is provided individually for each ink ejecting point. An undercut phenomenon in an etching operation on an isotropic material is used, and the ink ejecting parts are formed in the conical and pointed needle shape protruding from the orifice plate.