Patent ID: 8356872
Filing Date: 2013-01-22
Classification: B41J

Abstract:
1. A liquid discharge apparatus comprising: a nozzle from which liquid is discharged; a pressure chamber that gives a pressure change to the liquid in order to discharge the liquid from the nozzle; a liquid supply portion that communicates with the pressure chamber and supplies the liquid to the pressure chamber, wherein impedance of the nozzle is lower than that of the liquid supply portion; a device that performs an operation for giving the pressure change to the liquid in the pressure chamber; and a discharge pulse generating unit that generates a discharge pulse for operating the device in order to discharge the liquid from the nozzle; wherein a viscosity of the liquid is equal to or higher than 8 millipascal seconds; the nozzle has a first portion of which a liquid discharge side has an opening area that is smaller than that of a pressure chamber side, and a second portion that communicates with an end portion of the discharge side of the first portion; an opening area of the end of the discharge side of the second portion is equal to or smaller than 1/9 of the opening area of the pressure chamber side as an opening of the liquid supply portion; and the discharge pulse has a decompression portion that decompresses the liquid to lead a meniscus positioned in the second portion to the first portion, and a compression portion that compresses the liquid to discharge the liquid before the meniscus which has been led to the first portion returns to the second portion.