Ink jet head having an improved ink discharging outlet face...

B - Operations – Transporting – 41 – J

Patent

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Details

B41J 2/135 (2006.01) B41J 2/14 (2006.01) B41J 2/16 (2006.01) B41J 2/165 (2006.01)

Patent

CA 2126232

This invention is directed to prevent an ink jet inactivation state which is induced when ink droplets adhering to the jet port surface of an ink jet head reach the jet port, and is characterized by including a water repellent region in the proximity of the jet port disposed on the jet port surface and a groove-like hydrophilic region inside a region spaced apart by a predetermined distance from the jet port and adjacent to the water repelling region. Since the groove-like hydrophilic region is disposed, the ink droplets adhering to the jet part surface can be taken into the hydrophilic region. Accordingly, excellent recording can be accomplished even under the condition of high speed recording and high frequency driving.

La présente invention vise à empêcher un état d'inactivation du jet d'encre, lequel est induit lorsque les gouttelettes d'encre adhérant à la surface d'orifice du jet d'une tête à jet d'encre atteignent l'orifice du jet, et est caractérisée par le fait qu'elle comporte une région hydrofuge à proximité de l'orifice du jet, disposée sur la surface dudit orifice, et une région hydrophile en forme de rainure à l'intérieur d'une région espacée d'une distance prédéterminée de l'orifice du jet et adjacente à la région hydrofuge. Etant donné la disposition de la région hydrophile, les gouttelettes d'encre adhérant à la surface de l'orifice du jet peuvent être absorbées dans la région hydrophile. En conséquence, on peut obtenir un excellent enregistrement, même dans des conditions d'enregistrement à haute vitesse et d'excitation à haute fréquence.

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