Electrohydrodynamic print head with ink pinning

An electrohydrodynamic print head comprising:

• a nozzle carrier,
• a plurality of nozzles arranged on said nozzle carrier, wherein each nozzle forms a projection arranged on a front side of said nozzle carrier and extending into an ejection direction of the print head,
• a plurality of ejection electrodes associated with said nozzles and located on the front side of said nozzles,
• a support structure supporting said ejection electrodes on said nozzle carrier, wherein said support structure comprises a plurality of support elements arranged between said nozzles,
• a plurality of ink supply ducts for the nozzles, with at least one ink supply duct ending at each nozzle, and
• a plurality of ink suction ducts, with at least one ink suction duct ending at each nozzle,
• wherein, for a given nozzle, the nozzle is surrounded by openings of one or more suction ducts, wherein the openings are arranged between the nozzle and support elements next to it.

An electrohydrodynamic print head comprising:

• a nozzle carrier,
• a plurality of nozzles arranged on said nozzle carrier, wherein each nozzle forms a projection arranged on a front side of said nozzle carrier and extending into an ejection direction of the print head,
• a plurality of ejection electrodes associated with said nozzles and located on the front side of said nozzles,
• a plurality of ink supply ducts for the nozzles, with at least one ink supply duct ending at each nozzle, and
• a plurality of ink suction ducts, with at least one ink suction duct ending at each nozzle,
• wherein at a given nozzle;
• the supply duct is connected to at least one transversal exit duct extending transversally to said ejection direction and, in addition,
• the supply duct is connected to an axial exit duct extending towards a tip of the nozzle.

An electrohydrodynamic print head comprising:

• a nozzle carrier,
• a plurality of nozzles arranged on said nozzle carrier, wherein each nozzle forms a projection arranged on a front side of said nozzle carrier and extending into an ejection direction of the print head,
• a plurality of ejection electrodes associated with said nozzles and located on the front side of said nozzles,
• a plurality of ink supply ducts for the nozzles, with at least one ink supply duct ending at each nozzle, and
• a plurality of ink suction ducts, with at least one ink suction duct ending at each nozzle,
• wherein said nozzle carrier comprises
• a front layer, wherein said nozzles are mounted to a front side of the front layer,
• a backing layer located at a back side of said front layer,
• wherein electrical vias connected to the ejection electrodes extend through the front layer and the backing layer and
• wherein ink ducts are located in said front layer.