Electrohydrodynamic print head with shaping electrodes and extraction electrodes
AssigneeScrona AG
InventorPatrick Galliker
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Abstract
The electrohydrodynamic print head comprises a plurality of nozzles. Each nozzle has a central nozzle duct laterally surrounded by a nozzle wall. The top end of the nozzle duct communicates with an ink feed duct. An annular trench laterally surrounds the nozzle. An extraction electrode is located around the axis of the nozzle at a level below it, and a shaping electrode located laterally outside the nozzle duct. The shaping electrode is arranged within a ring having a horizontal width of less than the vertical distance between said shaping electrode and the extraction electrode or it is located above the trench. Both these measures allow to operate the device with high voltages with reduced risk of electrical breakdown.
Claims29
An electrohydrodynamic print head comprising
- at least one nozzle having a central nozzle duct laterally surrounded by a nozzle wall,
- an annular trench laterally surrounding said nozzle,
- an extraction electrode located around an axis of said nozzle at a level below said nozzle,
- a shaping electrode located laterally outside said nozzle duct, wherein said shaping electrode
- is arranged within a ring having a horizontal width W1 of less than a vertical distance between said shaping, electrode and said extraction electrode and/or
- is located at a level above said trench.
Dependencies are inferred from the claim text.