DROPLET EJECTION HEAD AND DROPLET EJECTION APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a droplet ejection head and a droplet ejection apparatus for decreasing flow path resistance in an ink flow path and simultaneously not choking any ink flow on the way of the ink flow path. SOLUTION: The droplet ejection head is configured by laminating a cavity plate 3 having a bottom wall forming a diaphragm 8 and a pressure chamber 7 storing and ejecting a droplet formed thereon, an electrode substrate 4 on which an individual electrode 17 for driving the diaphragm 8 is formed opposed to the diaphragm 8, and a reservoir substrate 2 including a reservoir 10 for supplying a droplet to the pressure chamber 7, a supply hole 9 for transferring the droplet from the reservoir 10 to the pressure chamber 7, and a nozzle communicating hole 11 for transferring the droplet from the pressure chamber 7 to a nozzle hole 5 wherein when a cross-sectional area of the flow path in the pressure chamber 7 is taken as S0, a cross-sectional area of the flow path of a connecting path connecting to the pressure chamber 7 from the supply hole 9 is taken as S1, and a cross-sectional area of the flow path in the supply hole 9 is taken as S2, an ink flow path is formed so that a relation of S2>S1>S0 or S2