Patent ID: 6022100
Filing Date: 2000-02-08
Classification: B41J

Abstract:
A liquid jet head comprising:a liquid ejecting outlet;a liquid passage communicating with said ejection outlet and an inlet which are substantially opposed to each other, said liquid passage having an internal surface, a cross-sectional area, and a position which is substantially within a heat acting portion; anda heat generating resistor disposed at said internal surface of said liquid passage for supplying heat to the liquid in the heat acting portion in said liquid to create a bubble in the liquid passage to eject the liquid through said ejection outlet;wherein the cross-sectional area of said liquid passage increases from the position which is substantially within the heat acting portion and which is closer to said ejection outlet than a point of a collapse of the bubble toward said ejection outlet, and the cross-sectional area starts increasing at the position so that a shock wave formed by the collapse of the bubble is controlled.