Patent ID: 7513601

Claim:
A liquid discharge head comprising: a discharge energy generating element which generates energy for discharging liquid droplets; an element substrate on which the discharge energy generating element is disposed; a nozzle having a discharge port which discharges the liquid droplets, a bubbling chamber in which bubbles are generated by the discharge energy generating element, and a supply path for supplying a liquid to the bubbling chamber; and an orifice substrate having the nozzle and a supply chamber for supplying the liquid to the nozzle, and bonded to a main surface of the element substrate, the bubbling chamber comprising a first bubbling chamber which is connected to the supply path with a main surface of the element substrate forming a bottom surface thereof and in which the bubbles are generated in the liquid by the discharge energy generating element, and a second bubbling chamber connected to the first bubbling chamber, the nozzle having a discharge port portion including the discharge port connected to the second bubbling chamber, and satisfying a relation of S 2 >S 1 >S 3 , wherein an average sectional area of the first bubbling chamber is S 1 , an average sectional area of the second bubbling chamber is S 2 , and an average sectional area of the discharge port portion is S 3 in sections parallel to the main surface of the element substrate, and wherein the first bubbling chamber, the second bubbling chamber and the discharge port portion are formed in the orifice substrate.