Patent ID: 8109587
Filing Date: 2012-02-07
Classification: B41J

Abstract:
1. A capacitive load driving circuit comprising: a filter that includes an inductor, an analog driving signal being input to one end of the inductor, and a capacitor with a fixed capacitance having one electrode connected to the other end of the inductor and the other electrode connected to ground; a plurality of capacitive loads connected in parallel to the capacitor, any of which may be driven in accordance with the analog driving signal input to one end of the inductor; a conversion section that converts a load voltage output from the other end of the inductor to a digital signal; a signal processing section that generates a predetermined signal for driving the capacitive load, derives a signal representing a magnitude of an electric current flowing to the capacitive load based on the digital signal and a digital driving signal, subtracts the signal representing the magnitude of an electric current from the predetermined signal, and outputs the subtracted signal as the digital driving signal; and a switching section that generates the analog driving signal by performing switching based on the digital driving signal, and that outputs the analog driving signal to one end of the inductor.