Ink-jet head

An ink-jet head comprising:

• a plurality of nozzles for ejecting ink;
• a plurality of pressure chambers provided correspondingly to the respective nozzles and connected to the nozzles;
• a slender common ink chamber for distributing and supplying ink to the pressure chambers;
• a plurality of connection passages provided correspondingly to the respective pressure chambers, one ends of which are connected to the common ink chamber and the other ends of which are connected to the respective pressure chambers;
• a first member forming the common ink chamber;
• and
• a second member being adjacent to the first member and having openings of the connection passages formed to be aligned in a surface at a side of the first member,
• wherein when the first member and the second member are connected to each other, an opening positioned at one end in an alignment direction of the openings is partially closed by an area of the first member forming an end of the common ink chamber in a longitudinal direction.

An ink-jet head comprising:

• a plurality of nozzles for ejecting ink;
• a plurality of pressure chambers provided correspondingly to the respective nozzles and connected to the nozzles;
• a common ink chamber for distributing and supplying ink to the pressure chambers;
• a supply passage for supplying the ink to the common ink chamber;
• a plurality of connection passages provided correspondingly to the respective pressure chambers, one ends of which are connected to the common ink chamber and the other ends of which are connected to the respective pressure chambers;
• a first member forming the common ink chamber;
• and
• a second member being adjacent to the first member and having openings of the connection passages formed to be aligned in a surface at a side of the first member,
• wherein among the openings, only a part of an opening positioned at a most downstream end in a flowing direction of the ink from the supply passage in the common ink chamber and at one side in an alignment direction faces the most downstream end of the common ink chamber.

An ink-jet head comprising:

• a plurality of nozzles for ejecting ink;
• a plurality of pressure chambers provided correspondingly to the respective nozzles and connected to the nozzles;
• a common ink chamber for distributing and supplying ink to the pressure chambers;
• a supply passage for supplying the ink to the common ink chamber;
• and
• a plurality of connection passages provided correspondingly to the respective pressure chambers, one ends of which are connected to the common ink chamber and the other ends of which are connected to the respective pressure chambers;
• wherein among the openings, an opening positioned at a most downstream end in a flowing direction of the ink from the supply passage in the common ink chamber is positioned to be spaced apart from an end of the common ink chamber at the most downstream side by at least one pitch of alignment intervals of the openings.

An ink-jet head comprising:

• a plurality of nozzles for ejecting ink;
• a plurality of pressure chambers provided correspondingly to the respective nozzles and connected to the nozzles;
• a common ink chamber for distributing and supplying ink to the pressure chambers;
• a supply passage for supplying the ink to the common ink chamber;
• and
• a plurality of connection passages provided correspondingly to the respective pressure chambers, one ends of which are connected to the common ink chamber and the other ends of which are connected to the respective pressure chambers;
• wherein an ink trap part is formed at a most downstream side in a flowing direction of the ink from the supply passage in the common ink chamber, and the ink trap part has a length of at least one pitch of alignment intervals of the openings.