Patent ID: 7048358
Filing Date: 2006-05-23
Classification: B41J

Abstract:
1. A liquid discharge head comprising: a discharge energy generating element for generating energy for discharging a liquid droplet; an element substrate having a main surface on which said discharge energy generating element is provided; a discharge port portion having a discharge port for discharging the liquid droplet; a nozzle having a bubbling chamber in which a bubble is generated in liquid by said discharge energy generating element and a supply path for supplying the liquid to said bubbling chamber; a supply chamber for supplying the liquid to said nozzle; and an orifice substrate joined to the main surface of said element substrate, wherein said bubbling chamber includes a first bubbling chamber which communicates with said supply path and uses a portion of the main surface of said element substrate as a bottom surface of said first bubbling chamber and in which the bubble is generated in the liquid by said discharge energy generating element and a second bubbling chamber communicating with said first bubbling chamber, said second bubbling chamber communicates with said discharge port portion, a central axis of a lower surface of said second bubbling chamber extending through a center of said lower surface of said second bubbling chamber in a direction perpendicular to said substrate coincides with a central axis of an upper surface of said second bubbling chamber extending through a center of said upper surface of said second bubbling chamber in a direction perpendicular to said substrate, a cross-sectional area of said upper surface with respect to a central axis of said second bubbling chamber extending through the center of said second bubbling chamber in a direction perpendicular to said substrate is smaller than a cross-sectional area of said lower surface with respect to the central axis of said second bubbling chamber, a cross-sectional area of said second bubbling chamber with respect to the central axis of said second bubbling chamber changes continuously from said lower surface to said upper surface of said second bubbling chamber, such that a side wall surface of said second bubbling chamber has an inclination of 10 to 45 degrees with respect to a plane perpendicular to the main surface of said element substrate, and the cross-sectional area of said upper surface with respect to the central axis of said second bubbling chamber is greater than a cross-sectional area of said discharge port portion with respect to a central axis of said discharge port portion.