Patent ID: 7628474
Filing Date: 2009-12-08
Classification: B41J

Abstract:
1. A discharging head for discharging liquid onto a discharge receiving medium, comprising: a vibration plate forming at least a portion of a pressure chamber storing liquid to be discharged; and a piezoelectric element, joined to said vibration plate, for generating a pressure forming a discharge force for discharging liquid inside said pressure chamber, wherein a first recess formed as grooves that intersect on a surface of the vibration plate that joins to said piezoelectric element in an approximately central region of said vibration plate, the intersecting portions of the grooves forming the first recess substantially occupying a central part of the central region where said piezoelectric element is joined to said vibration plate, and a second recess is provided on a surface of said vibration plate that is adjacent to said pressure chamber and in a position where an entirety of said second recess is outside the region of said vibration plate where said piezoelectric element is joined to said vibration plate, wherein a depth to width ratio of the second recess exceeds 1.