Patent ID: 7922304

Claim:
A liquid droplet jetting head which jets droplets of a liquid, comprising: a channel unit in which a liquid channel through which the liquid flows is formed; a piezoelectric unit which is stacked on the channel unit and which applies a jetting pressure to the liquid in the liquid channel, the piezoelectric unit having a plurality of drive portions which are driven by a drive signal, a plurality of individual drive electrodes each of which is connected to one of the drive portions on one surface of the piezoelectric unit, and a common drive electrode which is connected commonly to the drive portions on the one surface of the piezoelectric unit and arranged in the piezoelectric unit on an outer side of the individual drive electrodes; and a wiring unit stacked on the one surface of the piezoelectric unit and having a sheet shaped substrate; an individual supply-terminal group including a plurality of individual supply-terminals provided at positions, of a facing-surface of the wiring unit facing the substrate, corresponding to the individual drive electrodes; a common supply-terminal provided at a position of the facing-surface corresponding to the common drive electrode; and an isolative covering layer which is stacked on the facing-surface, which covers the individual supply-terminals and the common supply-terminal, and in which an opening and a trapping groove are formed, a part of the individual supply-terminals and a part of the common supply-terminal being exposed via the opening, and the trapping groove being arranged in the covering layer at an inner side of a peripheral edge portion of the covering layer corresponding to an outer peripheral edge of the piezoelectric unit to surround the individual supply-terminal group from an outer side of the individual supply-terminal group, wherein the trapping groove is open toward the piezoelectric unit to trap a liquid which enters from outside of the piezoelectric unit.