Patent ID: 10744765

Abstract:
An object of the present invention is to provide a liquid droplet ejection head and a liquid droplet ejection apparatus in which viscosity resistance of a liquid to be ejected is reduced on an ejection side of a nozzle to prevent pointed-end ejection and to improve accuracy of an ejection angle. This object is achieved by the following. That is, a channel 28 having a volume to be changed by a pressure generation element and a nozzle 23 communicating with the channel 28 are included. The inside of the nozzle 23 has a conical portion 23a with a diameter becoming gradually smaller toward an outside, and a cylindrical portion 23b continuous with the conical portion 23a and communicating with the outside. A connecting part of the conical portion 23a to the cylindrical portion 23b has the same opening cross-sectional shape as a connecting part of the cylindrical portion 23b to the conical portion 23a. When an inner diameter of the cylindrical portion 23b is represented by D0, the cylindrical portion 23b has an axial length of 0.1D0 to 0.3D0, and the conical portion 23a has an axial length of 0.6D0 or more and a conical surface in which a generating line has an angle of 6 degrees or more and 15 degrees or less with respect to a nozzle central axis.