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 2/025 (2006.01)

Patent

CA 2288861

A droplet generator for a continuous stream ink jet print head comprising: an elongate cavity (13) for containing the ink; nozzle orifices (7) communicating from within to without 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); actuator means (3) for vibrating the ink in said cavity (13) such that each said jet breaks up into ink droplets at the same predetermined distance from its respective nozzle orifice (7), said actuator means (3) being disposed on the opposite side of said cavity (13) to said nozzle orifices (7); and extending between said actuator means (3) and said nozzle orifices (7) a surrounding wall of said cavity (13) for containing the ink between said actuator means (3) and said nozzle orifices (7), said surrounding wall comprising inner and outer constituent walls, the resistive component of the wave impedance of said outer wall being such that the outer wall passively damps vibration of the inner wall by dissipating its vibration, the reactive component of the wave impedance of said outer wall being such that the outer wall actively restrains vibration of the inner wall, said outer wall thereby ensuring that each said jet breaks up into ink droplets at said same predetermined distance from its respective nozzle orifice (7).

Générateur de gouttelettes pour tête d'impression à jet d'encre continu, comprenant: une cavité allongée (13), qui contient l'encre; des orifices (7) de busette, qui font communiquer l'intérieur de la cavité (13) avec l'extérieur, de façon que l'encre sorte de la cavité afin de former des jets, et qui s'étendent sur la longueur de ladite cavité; un dispositif d'actionnement (3), qui fait vibrer l'encre dans la cavité (13), de façon que tous les jets se brisent et forment des gouttelettes d'encre à la même distance prédéterminée des orifices (7) de busette correspondants, et qui est disposé sur le côté opposé de ladite cavité par rapport auxdits orifices; et, entre le dispositif d'actionnement (3) et les orifices (7) de busette, une paroi (13) qui entoure la cavité de façon à contenir l'encre entre le dispositif d'actionnement (3) et les orifices (7), et qui est constituée d'une paroi interne et d'une paroi externe. La composante réelle de l'impédance d'onde de la paroi externe est telle que celle-ci amortit passivement les vibrations de la paroi interne en les dissipant, et la composante réactive de l'impédance d'onde de ladite paroi externe est telle que celle-ci limite activement les vibrations de la paroi interne. La paroi externe assure ainsi que tous les jets d'encre se briseront et formeront des gouttelettes d'encre à la même distance prédéterminée des orifices (7) de busette correspondants.

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