Liquid ejecting apparatus and control method therefor

Abstract

A liquid ejecting apparatus includes an ejection unit which includes a pressure chamber and a pressure generation element, and which ejects the liquid through a nozzle of the pressure chamber in accordance with the variation of the pressure inside the pressure chamber; a driving signal generation section; a driving section which causes the liquid to eject through the nozzle by supplying the pressure generation element with an ejection waveform included in the driving signal, and which transmits a slight vibration to the liquid contained in the pressure chamber a plurality of number of times during the driving period of time by supplying the pressure generation element with a plurality of slight vibration waveforms which is included during the driving period of time of the driving signal.

Description

technical field [0001] The present invention relates to a technology for ejecting liquid such as ink. Background technique [0002] In the recording head that ejects the ink in the pressure chamber by changing the pressure in the pressure chamber with a pressure generating element such as a piezoelectric element or a heating element, by applying micro-vibration to the ink in the pressure chamber (so that the ink does not flow from The degree to which the nozzle is ejected agitates the ink), thereby reducing viscosity. For example, Patent Document 1 discloses a technique in which two systems of drive signals (COMP, COMA) are used for ink ejection and microvibration in a pressure chamber. [0003] In one cycle of the drive signal COMP, one ejection pulse for ejecting the ink in the pressure chamber and one micro-vibration pulse for applying micro-vibration to the ink are set, and in one cycle of the drive signal COMA, a plurality of micro vibration pulse. During the printin...

AI Technical Summary

Problems solved by technology

However, in a structure in which the pressure chamber is miniaturized, the thickening of the ink in the pressure chamber occurs in a short time. occur

Therefore, in the technique of Patent Document 1, which applies a microvibration once per cycle of the drive signal COMP during the printing period, there is a possibility that the viscosity increase cannot be effectively reduced due to insufficient agitation of the ink in the pressure chamber.

In addition, in the technique of Patent Document 1, since signals of two systems, the drive signal COMP used during the printing period, and the drive signal COMA used outside the printing period are required, there is a problem in generating the drive signal The processing of processing, and the processing of driving the pressure generating element by appropriately selecting each driving signal have a large load.

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