Patent ID: 8430468
Filing Date: 2013-04-30
Classification: B41J,H01L

Abstract:
1. A head drive apparatus of an inkjet printer, comprising: a plurality of nozzles provided to an inkjet head; a plurality of actuators provided corresponding to the nozzles; and a drive unit that applies a drive signal to the plurality of actuators, wherein the drive unit, includes: a drive waveform generator that generates a drive waveform signal as a reference of the drive signal; a modulator that pulse modulates the drive waveform signal to output a modulated signal; a digital power amplifier that amplifies power of the modulated signal to output an amplified signal; a low pass filter that smoothes the amplified signal and supplies the actuators the amplified signal as the drive signal; and an inverse filter provided in a subsequent stage of the drive waveform generator, wherein a frequency characteristic of the inverse filter, which is based on the capacitances of the actuators and the low pass filter, is corrected to a predetermined frequency characteristic based on a number of actuators to be driven derived from print data, wherein the predetermined frequency characteristic of the inverse filter is set as a function of the number of the actuators.