Patent ID: 7222945

Claim:
A fluid ejection apparatus, comprising: a chamber containing fluid; a manifold connected to the chamber, wherein the fluid flows into the chamber therethrough in a first direction; an orifice connected to the chamber; a first bubble generating element disposed above the chamber and close to the orifice to generate a first bubble, the first bubble generating element having a width defined in a direction parallel to the first direction; and a second bubble generating element disposed above the chamber and close to the orifice to generate a second bubble, the second bubble generating element having a width defined in a direction parallel to the first direction, wherein the first bubble generating element is closer to the manifold than the second bubble generating element, the fluid in the chamber is ejected via the orifice by the first and second bubbles, the ratio of the distance between the center of the first bubble generating element and the center of the orifice to the diameter of the orifice is between 0.7 and 1.3, the ratio of the distance between the center of the second bubble generating element and the center of the orifice to the diameter of the orifice is between 0.7 and 1.3, and the ratio of the width of the first bubble generating element to the width of the second bubble generating element is between 1.0 and 1.2.