Liquid injection head tip, liquid injection head, liquid injection device, manufacturing method of liquid injection head tip and flow path plate

摘要

PROBLEM TO BE SOLVED: To suppress a variation in film thickness of a protective film in a plurality of channels. SOLUTION: A head chip 40 of an embodiment is joined to actuator plates 50A and 50B in which a plurality of channels 51 and 52 extending in the Z direction are provided at intervals in the X direction and actuator plates 50A and 50B. A flow path plate 80 having inlet flow paths 81A and 81B communicating with the plurality of channels 51 is provided, and the inlet flow paths 81A and 81B extend along the X direction so as to straddle the plurality of channels 51 and flow. It has an opening 85 that opens on the outer surface of the path plate 80, and the distance between the plurality of discharge channels 51 and the opening 85 allows fluid for forming a protective film in the plurality of discharge channels 51 to be opened in the flow path plate 80. When the fluid is supplied to the plurality of discharge channels 51 through the unit 85, the thicknesses of the protective films in the plurality of discharge channels 51 are set to be the same. [Selection diagram] Fig. 3