Ink jet printing head and ink jet printing device enabling stable high-frequency ink drop ejection and high-speed printing

Abstract

An ink jet printing head includes a common ink channel and a plurality of ejectors (each of which includes a nozzle and a pressure generation chamber which is filled with ink supplied from the common ink channel) which are connected to the common ink channel for ejecting ink drops. The common ink channel is provided with an air damper, and acoustic capacitance Cp of the common ink channel per ejector is set based on acoustic capacitance Cn of the nozzle and acoustic capacitance Cc of the pressure generation chamber. For example, the acoustic capacitance Cp of the common ink channel per ejector is set so as to satisfy two conditions: Cp>Cn and Cp>20 Cc. By such setting of the acoustic capacitance 10 Cp, crosstalk between the ejectors, the increase of refill time, and refill time variation between nozzles in simultaneous ink drop ejection are eliminated efficiently, thereby stable high-frequency ink drop ejection is made possible even when a large number of nozzles are connected to the common ink channel and thereby high-speed printing is realized.

Dependencies are inferred from the claim text.