Patent ID: 7703894
Filing Date: 2010-04-27
Classification: B41J,Y10T

Abstract:
1. A liquid ejection head comprising: a pressure generating chamber forming plate that is made of a metal and that has groove-like recess portions aligned to form pressure generating chambers and that is formed with communication ports penetrated in a plate thickness direction at one ends of the groove-like recess portions; a nozzle plate bored with nozzle openings at positions in correspondence with the communication ports; and a sealing plate that is made of a metal and that is for sealing opening faces of the groove-like recess portions, wherein: the liquid ejection head is constituted by bonding the sealing plate to a side of the pressure generating chamber forming plate where the groove-like recess portions are formed and also bonding the nozzle plate to an opposite side of the pressure generating chamber forming plate; and each of the groove-like recess portions extends in a longitudinal direction; the groove-like recess portions are arranged in a direction perpendicular to the longitudinal direction; and an inner face of each of the groove-like recess portions includes: two faces, each face from a respective one of two walls extending in the plate thickness direction; a face of a bottom portion having a substantially V-like shape, the bottom portion arranged between the two walls in the direction perpendicular to the longitudinal direction; and two continuous and smooth face-faces arranged in the direction perpendicular to the longitudinal direction, each of the continuous and smooth faces connected between a corresponding one of the two walls and the face of the bottom portion, each of the continuous and smooth faces having an arc shape.