Patent ID: 7992969
Filing Date: 2011-08-09
Classification: B41J

Abstract:
1. A liquid drop ejecting head for ejecting liquid drops from nozzles communicating with liquid chambers, comprising: a piezoelectric actuator including a diaphragm whose ends are fixed in a short-side direction of the diaphragm and plural active elements mounted on the diaphragm, each of the active elements being contractible and extendable by a supply of a voltage to displace the diaphragm in an out-of-plane direction, wherein the diaphragm is displaced with curvature so as to have a plurality of inflection points in the short-side direction, the plural active elements are disposed on the diaphragm without covering the inflection points, and at least one of the active elements is disposed on an area from a corresponding one of the ends of the diaphragm to a proximal inflection point of the inflection points in a cross-section in the short-side direction of the diaphragm to displace with curvature the area from the corresponding end of the diaphragm to the proximal inflection point toward the liquid chambers.