Improved Drop Ejection Characteristics through Use of Micro-Valves in Ink Jet Head

概要

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A new pressure-pulsed ink jet head with two micro-valves has been developed. This ink head gives a wide frequency response and produces little fluctuation in the velocity of the ink droplets. Drop ejection has been analyzed theoretically using a physical model, including meniscus motion in a nozzle, pressure generation by a piezoelectric transducer, and micro-valve operation. It is found that damped oscillation in the ink flow is produced by both the elastic energy of the piezoelectric transducer and the surface tension of the nozzle meniscus. This oscillation causes a deterioration in the characteristics of drop velocity versus operational frequency. However, the microvalves described here make it possible to prevent this damped oscillation, as well as to eliminate the capillarity dependency of the ink supply.
社団法人応用物理学会の論文
1984-06-20