| 摘要 |
PROBLEM TO BE SOLVED: To provide an ink jet printer head in which many ink pressure chambers conforming to many nozzles can be arranged without increasing a size of a cavity plate. SOLUTION: Nearly rhombic ink pressure chambers 17c are formed in six arrays from an array A to an array F to a base plate 17 constituting the cavity plate of the ink jet printer head. Ink supply ports 17a for supplying ink to the ink pressure chambers 17c are set to one acute angle parts of the ink pressure chambers 17c, and ink nozzle openings 17b for sending ink to the nozzles 11a are set to the other acute angle parts of the ink pressure chambers 17c.
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