Patent ID: 9682548
Date: 2017-06-20
CPC Classifications: B41J

Claim:
1. A print device configured to perform printing by an ink jet scheme, the print device comprising: an ink jet head including a nozzle that discharges ink droplets, an ink chamber that stores the ink droplets at an upstream of the nozzle, and a piezoelectric element that causes ink in the ink chamber to be discharged from the nozzle; and a drive signal output section that outputs a drive signal being a signal for causing the piezoelectric element to be displaced, wherein the drive signal is a signal that includes a discharge driving signal for causing the piezoelectric element to be displaced so that the ink droplets are discharged from the nozzle, and a post-discharge controlling signal for causing the piezoelectric element to be displaced so that a meniscus vibration in which a liquid surface of the ink vibrates at a position of the nozzle is settled after the ink droplets are discharged from the nozzle, wherein in a case of denoting a timing when the ink droplets are discharged from the nozzle as a timing To, and denoting a cycle of a natural vibration of a meniscus vibration in which a liquid surface of the ink vibrates at a position of the nozzle after the ink droplets are discharged as Tc, the drive signal output section is configured to: output, as the discharge driving signal, a signal by which a voltage changes linearly from a first voltage to a second voltage, which are predeterminedly set, at a time period, which is earlier than the timing To, when the ink droplets are to be discharged from the nozzle, output, as the post-discharge controlling signal, a signal of a substantial sine wave having a cycle equal to the measured cycle Tc, at least after the timing To, and within a time Tc/4 from the timing To, such that the piezoelectric element is displaced in a direction along which the meniscus vibration at the position of the nozzle after the ink droplets are discharged is suppressed, wherein the post-discharge controlling signal has an inversed phase relationship with a natural vibration of the meniscus vibration.