INKJET HEAD AND INKJET RECORDING DEVICE

The purpose of the present invention is to minimize the degradation of ink ejection performance by providing a circulation flow path and to effectively discharge air bubbles and the like near a nozzle without applying a load to a device. This inkjet head (1) is characterized in that: the inkjet head...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: HIGASHINO, Kusunoki, MATSUO, Takashi, KOBAYASHI, Hideyuki
Format: Patent
Sprache:eng ; fre ; ger
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Beschreibung
Zusammenfassung:The purpose of the present invention is to minimize the degradation of ink ejection performance by providing a circulation flow path and to effectively discharge air bubbles and the like near a nozzle without applying a load to a device. This inkjet head (1) is characterized in that: the inkjet head (1) is provided with a plurality of nozzles (211) for ejecting ink, a pressure chamber (231) individually communicated with the nozzles (211) and filled with ink, a pressure-generating means (piezoelectric element 24) as a driving source for discharging ink by applying pressure to the pressure chamber (231), an inlet (232) supplying ink to the pressure chamber (231) and having a constricted portion in which the flow path is narrower than the pressure chamber (231), and a circulation flow path (213) capable of discharging ink in the pressure chamber (231) from the vicinity of the nozzles (211); the viscosity resistance of the circulation flow path (213) is lower than the viscosity resistance of the nozzles (211); and the impedance of the circulation flow path (213) is at least half the impedance of the inlet (232).