Telecom Italia S.p.a.

Giancarlo Martina

Alessandro Scardovi

Silvano Tori

Duccio Spartaco Sassano

Ink jet print head comprising a substrate with an upper surface and a lower surface; a plurality of actuators with ejection chambers and ink supply passages, an ink distribution slot formed in the substrate between the lower surface and the upper surface; a manifold formed in the substrate of the upper surface around the slot for the feed to the actuators; and a plurality of bubble prevention elements formed in the feed manifold. The plurality of bubble prevention elements is provided only for a marginal set of actuators remote from the distribution slot.

Ink jet print head which prevents bubbles from collecting

The invention relates to an ink jet print head structure for printing devices, comprising a substrate in which one or more slots are realized and a nozzle plate connected to the substrate. The nozzle plate defines a first axis (X) and a second perpendicular axis (Y) and comprises a plurality of nozzles from which ink is ejected in fluid communication with the slots. The slots extends along the second axis (Y). A plurality of strip-like stress relief elements is realized on the nozzle plate, the plurality of stress relief elements is disposed so to extend along the Y axis, and each stress relief element of the plurality defines an aperture on a free surface of said nozzle plate. In addition, the total X projections of all apertures defined by the plurality of stress relief elements along the first (X) axis has a resulting length comprised between 10% and 55% of the overall width of the nozzle plate along the same first axis (X).

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Arnad, Italy

Giancarlo Martina