| 摘要 |
PROBLEM TO BE SOLVED: To provide an ink jet recording head in which the reduction of a discharge speed of ink drops as a result of making a discharge port smaller in diameter is suppressed. SOLUTION: The ink jet head has a discharge port part comprising a first discharge port part continuous from the discharge port and a second discharge port part, which makes the first discharge port part and a bubbling chamber to communicate with each other. The second discharge port part has the end face which includes a boundary part with the first discharge port part and is parallel with the main face of an element substrate. The area of the cross section in parallel to the main face of the element substrate at the second discharge port part is larger than the area at the boundary part even in any of the cross sections of the second discharge port part from the opening face on the bubbling chamber side to the end face on the first discharge port side. The shape of the cross section, which is parallel to the main face of the element substrate, of the opening face on the bubbling chamber side at the second discharge port part has the longer length in the direction vertical to the arrangement direction of the discharge port than the length in the direction parallel to the arrangement direction of the discharge port. COPYRIGHT: (C)2004,JPO&NCIPI
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