Patent ID: 6832826
Filing Date: 2004-12-21
Classification: B41J

Abstract:
An ink-drop generator for an inkjet printer in which an inkjet is sprayed in drops, said generator particularly comprising:a generator body, at least one acoustic wave generator with a body elongated in an axial direction to the inkjet, each generator having a vibrating surface perpendicular to the axial direction of the jets, at least one section comprising the vibrating surface of each acoustic generator being housed in a housing of the drop-generator body, at least one resonance cavity intended to contain ink, the acoustic-wave generator housing and the cavity being connected by a hollow connector section defined by a lateral connector surface, said lateral surface having, along the axial line of the jets, a lower limit in the cavity and an upper limit close to the acoustic generator housing, the upper limit of the transverse cross-section of said surface being circular with a diameter equal to that of the acoustic-wave generator housing, the intersections of this surface with the planes parallel to a nozzle plate, these planes planes being located under the upper limit and above the lower limit, being closed curves the perimeter of which diminishes when an intersection plane moves away from the upper limit, a first section only of each cavity being constituted in a main section of said generator body and, in this configuration, a second section in a continuation of said generator body connected to be leaktight to the generator body, each cavity having an ink feed, each cavity being defined particularly by the nozzle plate and a wall, the intersection of the wall and the nozzle plate defining a first plane contour line of the wall, the nozzle plate comprising a plurality of nozzles aligned along an axial direction of the nozzles perpendicular to the axial direction of the jets, the axial direction of the jets and the axial direction of the nozzles defining a plane of the jets, a generator characterized in that the wall of each resonance cavity is perpendicular to said nozzle plate, the first contour line being formed by two equal segments that are parallel to one another and the axial direction of the nozzles, each segment having two ends: a first and a second end, the two first ends of each segment being connected by a first curved line and the two second ends of each segment being connected by a second curved line.