Patent ID: 7524036
Filing Date: 2009-04-28
Classification: B41J

Abstract:
1. A liquid ejection head, comprising: a nozzle through which liquid is ejected, the nozzle having an inertance Mn; a pressure chamber which accommodates the liquid to be ejected through the nozzle; a pressurizing device which applies pressure to the liquid accommodated in the pressure chamber by deforming the pressure chamber to eject the ink from the pressure chamber; a supply side flow passage which communicates with the pressure chamber and supplies the liquid to the pressure chamber, and the supply side flow passage having an inertance Ms smaller than the inertance Mn of the nozzle; and a restricting device which varies the minimum sectional area of the supply side flow passage so that the minimum sectional area As of the supply side flow passage when the liquid is supplied from the supply side flow passage into the pressure chamber and the minimum sectional area As′ of the supply side flow passage when the liquid is drained into the supply side flow passage from the pressure chamber have a relationship of As<As′.