Driving circuit, liquid discharge apparatus, and driving method

Abstract

The invention provides a driving circuit, a liquid ejecting apparatus, and a driving method. The possibility of malfunction of a piezoelectric element due to a decrease in piezoelectric characteristics of the piezoelectric element is reduced. There is provided a driving circuit that drives a piezoelectric element having a first electrode that is supplied a first voltage signal and a second electrode that is supplied a second voltage signal, and driven by a potential difference between the first electrode and the second electrode, the driving circuit including: a first voltage signal generationcircuit that outputs the first voltage signal; a second voltage signal generation circuit that outputs the second voltage signal; and a switch circuit in which the first voltage signal is input fromone end and the other end is electrically connected to the first electrode, a voltage value of the first voltage signal approaches a voltage value of the second voltage signal in a shift period from afirst mode that is shifted after power is turned on to a second mode for driving the piezoelectric element.

Description

technical field [0001] The invention relates to a drive circuit, a liquid ejection device and a drive method. Background technique [0002] As a liquid ejection device such as an inkjet printer that ejects liquid such as ink to print images or documents, a device using a piezoelectric element such as a piezoelectric element is known. The piezoelectric elements are provided in the print head so as to correspond to a plurality of nozzles that eject ink and cavities that store ink ejected from the nozzles. Furthermore, when the piezoelectric element is displaced according to the drive signal, the vibration plate provided between the piezoelectric element and the cavity is deflected, thereby changing the volume of the cavity. As a result, a predetermined amount of ink is ejected from the nozzles at predetermined timing to form dots on the medium. [0003] Patent Document 1 discloses a liquid ejection device that supplies a voltage to an upper electrode with respect to a piezoe...

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Problems solved by technology

[0005] However, when the polarized piezoelectric element is supplied with an electric field in the direction opposite to the direct current electric field that was subjected to the polarization treatment, the polarization that has been aligned by the polarization treatment in the piezoelectric body disorder in direction

Such disturbance of the polarization direction degrades the piezoelectric characteristics of the piezoelectric element, and as a result, may cause malfunction of the piezoelectric element.

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