Patent ID: 8342170

Claim:
A liquid ejection method of ejecting a liquid containing a drug to be sucked into lungs, the method comprising the steps of: preparing a liquid ejection head having an individual liquid chamber including an energy generation portion generating energy required to eject the liquid, an ejection port formed of a recess portion to internally hold the liquid, and a throttling portion formed to have a smaller opening than the ejection port and allowing the individual liquid chamber and the ejection port to communicate with each other, an open end on the ejection port side of the throttling portion being covered by liquid held in the recess portion; and driving the energy generation portion so as to eject a main droplet and a liquid column from the ejection port, the liquid column to be separated into a plurality of sub-droplets, wherein a relationship (L 2 /L 1 )≧0.9 is set for length L 1 of the liquid column observed immediately after the liquid column has been separated from the main droplet and from the liquid in the ejection port and length L 2 of the liquid column observed immediately before the liquid column is separated into the plurality of sub-droplets.