Patent ID: 6612688
Filing Date: 2003-09-02
Classification: B41J

Abstract:
A liquid ejection apparatus comprising:a liquid ejection head including an electrothermal transducer element for generating thermal energy contributable to ejection of liquid, an ejection outlet for ejecting the liquid, the ejection outlet being provided at a position opposed to the electrothermal transducer element, and a liquid flow path in fluid communication with the ejection outlet to supply the liquid to the ejection outlet and having the electrothermal transducer element on a bottom side thereof; and circuitry for applying to the electrothermal transducer element a voltage which is lower than 1.35 times an ejection threshold voltage to supply the thermal energy to the liquid to cause the liquid to undergo a change of state to create a bubble, wherein the liquid is ejected through the ejection outlet by pressure of the bubble, wherein the bubble is first in communication with ambience during reduction of the volume of the bubble after the bubble reaches a maximum volume, and the bubble communicates with the ambience at a position closer to the electrothermal transducer element than to the ejection outlet.