Patent ID: 7303270

Claim:
An ink-jet head comprising: a joint member having an ink pathway through which ink supplied from an ink supply source passes, an ink outlet port formed at one end of the ink pathway, and a space which is formed in the vicinity of the one end of the ink pathway and whose cross-sectional shape and size in a direction perpendicular to an ink flow direction toward the ink outlet port are constant along the ink flow direction; a passage unit having a plurality of nozzles that eject ink, an ink receiving port that is larger than the ink outlet port and receives the ink flowing out of the ink outlet port, a first ink passage that has, at one end thereof, the ink receiving port and extends in the same direction as the ink flow direction toward the ink outlet port, and a second ink passage that extends from the other end of the first ink passage to the nozzles, the passage unit being connected to the joint member such that the ink receiving port confronts the ink outlet port; and a filter disposed within the first ink passage of the passage unit, wherein: a first space is formed between the ink receiving port and the filter, a cross-sectional shape and size of the first space in the direction perpendicular to the ink flow direction being constant along the ink flow direction; a second space is formed on a downstream side of the filter within the first ink passage, a cross-sectional shape and size of the second space in the direction perpendicular to the ink flow direction being constant along the ink flow direction; and the first space and the second space are contiguous to each other with the filter interposed therebetween, wherein the first space is greater in the x-direction than the second space.