Patent ID: 8262181
Filing Date: 2012-09-11
Classification: B41J

Abstract:
1. A fluid ejection device comprising: a modulator which pulse-modulates a drive waveform signal to obtain a modulated signal; a digital power amplifier which power-amplifies the modulated signal to obtain a power-amplified modulated signal; a low pass filter which filters the power-amplified modulated signal to obtain a drive signal that drives a plurality of actuators; and an inverse filter circuit, wherein the inverse filter circuit includes a delay device, a subtracter which subtracts an output signal of the delay device from the drive waveform signal, an amplifier which amplifies an output signal of the subtracter at a predetermined magnification ratio, an adder which adds an output signal of the amplifier and an input signal to the adder, a first switch which selects either one of the drive waveform signal or an output signal of the adder as an input signal to the delay device, a second switch which selects either one of the drive waveform signal or the output signal of the delay device as the input signal to the adder, and a switch connection control section which controls the first switch and the second switch.