Liquid Discharge Head and Recording Device Using Same

Abstract

Provided is a liquid discharge head through which discharged liquid droplets are easily gathered into one droplet, and a recording device using the head. A liquid discharge head 2 comprises a liquid pressurizing chamber 10, a displacement element 50 that applies a pressure to the liquid pressurizing chamber 10, a liquid discharge hole 8, and a communication passage 7 connecting between the liquid pressurizing chamber 10 and the liquid discharge hole 8. The communication passage 7 comprises a narrow portion 7-3 having a small cross-section area, a first communication passage 7-1 defined by a portion between a connection end to the liquid pressurizing chamber 10 and a connection end to the narrow portion 7-3, and a second communication passage 7-2 defined by a portion between a connection end to the liquid discharge hole 8 and the connection end to the narrow portion 7-3. A ratio of a length of the communication passage 7 and a length of the second communication passage 7-2; a ratio of combined inertance of the liquid pressurizing chamber 10 and the first communication passage 7-1 and combined inertance of the liquid discharge hole 8 and the first communication passage 7-1; and a ratio of combined compliance of the liquid pressurizing chamber 10 and the first communication passage 7-1 and combined compliance of the liquid discharge hole 8 and the first communication passage 7-1 fall within a predetermined ranges, respectively.

Dependencies are inferred from the claim text.