| 摘要 |
PROBLEM TO BE SOLVED: To provide a liquid ejection head capable of enhancing the ejection efficiency of liquid drop while increasing the ejection velocity of liquid drop and stabilizing the ejection quantity of liquid drop. SOLUTION: The liquid ejection head 1 comprises a heater 20, an element substrate 11 provided with the heater 20, and an orifice substrate 12 comprising a nozzle 27 having a part 26 provided with an opening 26a for ejecting a liquid drop, a bubbling chamber and a passage for supplying liquid to the bubbling chamber and a chamber 28 for supplying liquid to the nozzle 27. The bubbling chamber consists of a first bubbling chamber 31a and a second bubbling chamber 32b communicating, at the upper part thereof, with the ejection opening part 26 through a level difference. Side wall of the second bubbling chamber 32b contracts toward the direction of the ejection opening at an inclination of 10-45°and, in the peripheral part of the upper surface of the first bubbling chamber 31a touching the opening communicating with the second bubbling chamber 31b, protrusions 33 are formed continuously toward the direction of the major surface of the element substrate 11 while surrounding that opening. COPYRIGHT: (C)2004,JPO
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