A droplet generator for a continuous stream ink jet print head

Details A droplet generator for a continuous stream ink jet print head A droplet generator for a continuous stream ink jet print head

B - Operations, Transporting

41

J

B41J 2/135 (2006.01) B41J 2/025 (2006.01) B41J 2/16 (2006.01)

Patent

CA 2378948

A droplet generator for a continuous stream ink jet print head comprising: an elongate cavity (13) for containing the ink; nozzle orifices (7) in a wall (10) of said cavity (13) for passing ink from the cavity (13) to form jets, said nozzle orifices (7) extending along the length of said cavity (13); and actuator means (3) disposed on the opposite side of said cavity (13) to said wall (10) for vibrating the ink in said cavity (13) by itself vibrating relative to said wall (10), the vibration being such that each said jet breaks up into ink droplets at the same predetermined distance from said wall (10) of the cavity (13), the thickness (k) of said wall (10) through which said nozzle orifices (7) extend being less than 90 µm, said wall (10) comprising a planar member (10) secured to the remainder of said droplet generator so as to form a boundary (12) which extends around said nozzle orifices (7) and within which said planar member (10) is unsupported, said boundary (12) including first and second boundary lengths which extend along the length of said cavity (13) on either side of the nozzle orifices (7), the distance (a) between said first and second boundary lengths being less than 1700 µm.

L'invention concerne un générateur de gouttelettes pour tête d'impression à jet d'encre à flux continu, caractérisé en ce qu'il comprend une cavité de forme générale allongée (13) destinée à contenir l'encre ; des orifices de buse (7) ménagés dans une paroi (10) de ladite cavité (13) pour la circulation de l'encre, à partir de la cavité (13) pour former des jets, lesdits orifices de buse (7) s'étendant sur la longueur de ladite cavité (13) ; ainsi que des moyens actuateurs (3) disposés sur la face opposée de ladite cavité (13) vers ladite paroi (10) pour provoquer la vibration de l'encre dans ladite cavité (13), par autovibration par rapport à ladite paroi (10), la vibration étant telle que chaque jet se désagrège en gouttelettes d'encre à une même distance prédéterminée de ladite paroi (10) de la cavité (13), l'épaisseur (k) de la paroi (10) à travers laquelle lesdits orifices de buse (7) s'étendent étant inférieure à 90 µm, en ce que ladite paroi (10) comprend un élément plan (10), fixé au reste dudit générateur de gouttelettes, de manière à former une limite (12) qui s'étend autour des orifices (7) et à l'intérieur de laquelle ledit élément plan (10) est non soutenu, et en ce que ladite limite (12) comprend une première et une seconde longueurs limites s'étendant sur la longueur de ladite cavité (13), des deux côtés des orifices de buse (7), la distance (a) entre lesdites première et seconde longueurs limites étant inférieure à 1700 µm.

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