Patent ID: 6758555
Filing Date: 2004-07-06
Classification: B41J

Abstract:
A printing head for a continuous ink jet printer equipped with means for generating an ink jet according to an axis of the ink jet, from at least one ejection nozzle of the jet, and for splitting the jet into a series of drops, means for electrically charging the different drops in the series of drops in a selective way, and deflection electrodes for charged drops, deviating the drops in function of the value of the charge received, either towards a gutter for recuperating the drops, or to a printing substrate maintained locally by a printing substrate support, of the printing substrate, the deflection electrodes each having an upstream part, and a downstream part relative to the ejection nozzle of the jet, an active surface of each deflection electrode being a surface of said electrode facing the series of drops, the printing head characterised in that the deflection electrodes of the drops of the jet comprise two electrodes, a first and a second, the active surface of the first electrode having a first concave longitudinal curvature whose local radius of longitudinal curvature is located in a plane formed by the axis of the ink jet and a deviation direction of the drops, in that the active surface of the second electrode has a first convex longitudinal curvature and in that the first electrode has a recess with a border in its downstream part.