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(11) | EP 2 213 456 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Ink-jet head and ink-jet printer having ink-jet head |
| (57) An ink-jet head includes a passage unit (4) comprising a plurality of pressure chambers
(10) each connected with a nozzle (8) and arranged in a matrix in a plane to form
a plurality of pressure chamber rows (11a,11b) in a first direction (A) in the plane,
and a plurality of common ink passages (5a) each extending along the first direction
and communicating with the pressure chambers. The pressure chamber rows include first
pressure chamber rows (11a) each constituted by pressure chambers (10a) each connected
with a nozzle deviated on one side thereof with respect to a second direction crossing
the first direction, and second pressure chamber rows (11b) each constituted by pressure
chambers (10b) each connected with a nozzle deviated on the other side thereof with
respect to the second direction, when viewing from a third direction perpendicular
to the plane. Each of the common ink passages including at least a boundary region
between one of the first pressure chamber rows and one of the second pressure chamber
rows neighboring each other so that nozzles connected with the pressure chambers in
the each pressure chamber rows face outward each other when viewing from the third
direction, and each of the common ink passages not overlapping any of the nozzles.
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