| 摘要 |
PROBLEM TO BE SOLVED: To stabilize ejecting directions of ink drops and to execute refilling without problems. SOLUTION: At least a part of a hole face of an ink ejection nozzle 3 for ejecting ink drops is formed from a material that changes to be hydrophilic or hydrophobic with respect to ink corresponding to a light 200. The hole face of the ink ejection nozzle 3 is preferably constituted of an ink-hydrophilic layer 2, a modification layer 4 and an ink-hydrophobic layer 5 from an outlet 1 to the innermost in this order.
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