LIQUID DISCHARGING APPARATUS, HEAD UNIT, AND CONTROL METHOD OF LIQUID DISCHARGING APPARATUS

摘要

Provided is a liquid discharging apparatus which includes 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, and a multilayer circuit substrate on which the modulation circuit, the transistor, and the low pass filter are mounted. Furthermore, 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. In addition, 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.

主权项

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.