Patent ID: 9427958
Filing Date: 2016-08-30
CPC Classification: B41J,H02M

Claim Text:
1. A driving circuit for driving a capacitive load 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 capacitive load which is driven by receiving the drive signal; 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.