Patent ID: 6252616
Filing Date: 2001-06-26
Classification: B41J

Abstract:
A liquid ejection method, comprising the steps of:supplying liquid along a heat generating element disposed along a flow path from upstream of the heat generating element; andapplying heat generated by the heat generating element to the thus supplied liquid to generate a bubble, thus moving a free end of a movable member having the free end adjacent to an ejection outlet side by pressure produced by the generation of the bubble, said movable member being disposed faced to said heat generating element;supplying, to a heat generating element for applying thermal energy to said bubble generating region, a driving pulse divided into a first pulse and an adjacent second pulse with interval time therebetween;pre-heating the liquid by said first pulse to an extent insufficient to eject the liquid through said ejection outlet;generating a bubble by heating the liquid with said second pulse to eject the liquid through said ejection outlet;ejecting the liquid in an amount which is determined by controlling a degree of pre-heating of the liquid by changing at least one of a width of said first pulse or the interval time, wherein the change rate of the ejection amount of the liquid increases non-linearly with an increase of the width of said first pulse or an increase of the interval time period.