Patent ID: 7909437
Filing Date: 2011-03-22
Classification: B41J

Abstract:
1. A liquid discharge head for discharging liquid onto a medium while relatively scanning the medium in a position opposed to the medium, the liquid discharge head comprising: a substrate having a plurality of energy generating elements for generating heat energy for use in discharging the liquid; a plurality of nozzles provided in a row correspondingly to the plurality of energy generating elements; and a plurality of flow paths for supplying the liquid correspondingly to the plurality of nozzles, wherein each of the nozzles includes a chamber provided with a corresponding energy generating element and a discharge portion in communication with a corresponding flow path only via the chamber, wherein the discharge portion of at least one nozzle of the plurality of nozzles includes a first discharge portion having a discharge port for discharging the liquid, and a second discharge portion for communicating the chamber with the first discharge portion, wherein a contour of the second discharge portion includes a contour of the first discharge portion when viewed in the direction from the discharge port to the substrate and is included in a contour of the chamber; and wherein when the second discharge portion is divided into two spaces by a plane that passes through the center of the discharge port, is perpendicular to the direction along the row of nozzles, and is perpendicular to the substrate, one of the two spaces differs in volume from the other of the two spaces.