| 摘要 |
PROBLEM TO BE SOLVED: To eliminate nonuniformity in the discharge characteristic of ink from each nozzle by a method wherein a sheet-like top plate provided with a supply port formed by arranging a plurality of holes of a prescribed size in the shape of a grid is so provided on a piezoelectric element as to cover a plurality of short and long grooves and an ink pool is provided on the supply port. SOLUTION: A top plate 2 is a sheet-like nickel plate formed by an electric casting method and has a supply port 201 formed by arranging square holes in the shape of a grid. When a voltage is impressed, piezoelectric element deformed parts 111 and 112 contract simultaneously and ink being present in a long groove 102 is discharged from a nozzle 401. When the impression voltage is canceled, the long groove 102 is restored to the original capacity and put under a negative pressure and, therefore, the ink is supplied into the long groove 102 from the supply port 201. Since the supply port 201 is formed by arranging the square holes of which one side is 10μm long, the total area of the supply port 201 relating to the long grooves 102 in a plurality is invariant. Accordingly, an operation of refilling the long grooves 102 with the ink becomes uniform and the discharge characteristic of the ink is made free of nonuniformity.
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