Droplet deposition apparatus

B - Operations – Transporting – 41 – J

Patent

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Details

B41J 2/14 (2006.01) B41J 2/045 (2006.01) B41J 2/16 (2006.01) C23C 14/04 (2006.01)

Patent

CA 2248807

A drop-on-demand piezo-electric printhead has channel walls defined by piezo- electric material (10) with electrodes (26) along the length thereof. In portions of the channels which are open to an ink supply conduit, the piezo material is locally disabled, e.g. by reducing the width of the electrode or by interposing a material (40) of lower dielectric constant between the electrode and the piezo material. A lower capacitive load results.

La présente invention concerne une tête d'impression piézo-électrique de type "goutte à la demande". Les parois des canaux de cette tête sont définies par un matériau piézo-électrique (10) pourvu d'électrodes (26) sur une partie de la longueur. Dans les zones des canaux débouchant dans un conduit d'alimentation en encre, on inactive localement le matériau piézo-électrique, notamment par une réduction de la largeur de l'électrode ou par l'interposition d'une matière (40) à constante diélectrique inférieure entre l'électrode et la matière piézo-électrique.

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