Patent ID: 9004633
Filing Date: 2015-04-14
Classification: B41J

Abstract:
1. An ink-jet recording apparatus, comprising: a recording head, including a pressure chamber and a nozzle, the pressure chamber containing an ink, the nozzle communicating with the pressure chamber and the nozzle having an opening portion for discharging the ink; a piezoelectric element, for forming part of the pressure chamber; and a driving signal producing section, for producing a driving signal to be input to the piezoelectric element to change a volume of the pressure chamber, wherein the driving signal producing section produces the driving signal to perform: the driving signal output by the driving signal producing section is set such that a potential at an end point of the second contraction step is set to be positioned in a range opposite to a potential at an end point of the first expansion step with respect to a potential at a starting point of the first expansion step, and such that the potential at the starting point of the first expansion step is set to be substantially the same as a potential at a starting point of the second contraction step; wherein the driving signal producing section produces the driving signal such that a first holding step of holding the volume of the pressure chamber set after the first expansion step is performed between the first expansion step and the first contraction step to allow start of the discharge of the ink in the first contraction step in a timing in which the meniscus is first moved in the discharge direction, after a force of moving the meniscus in the direction opposite to the discharge step is applied in the first expansion step; each of a half of a vibration period of the meniscus in the first expansion step and the first holding step, of a half of a vibration period of the meniscus in the first contraction step and the second holding step, and of a half of a vibration period of the meniscus in the second contraction period and the third holding step ranges between Tc/4 to 1Tc, where Tc represents the Helmholtz vibration period.