Patent ID: 9156250
Filing Date: 2015-10-13
Classification: B41J,H02M

Abstract:
1. A liquid discharging apparatus comprising: a modulation circuit which generates a modulation signal which is obtained by pulse-modulating a source signal; a transistor which generates an amplified modulation signal by amplifying the modulation signal; a low pass filter which generates a drive signal by smoothening the amplified modulation signal; a piezoelectric element which is displaced by receiving the drive signal; a cavity of which the internal volume changes in accordance with the displacement of the piezoelectric element; a nozzle through which liquid in the cavity is discharged in accordance with change in the internal volume of the cavity; and a multilayer circuit substrate on which the modulation circuit, the transistor, and the low pass filter are mounted, wherein a signal based on the modulation signal, the amplified modulation signal, or the drive signal is fed back to the modulation circuit, in such a manner that the modulation circuit generates the modulation signal, wherein the multilayer circuit substrate has a multilayer configuration constituted of three or more layers which include at least one layer other than two surface layers, and wherein a feedback wiring pattern through which the modulation signal, the amplified modulation signal, or the drive signal is fed back to the modulation circuit is provided in the one layer.