(19)
(11)EP 2 371 544 A3

(12)EUROPEAN PATENT APPLICATION

(88)Date of publication A3:
19.02.2014 Bulletin 2014/08

(43)Date of publication A2:
05.10.2011 Bulletin 2011/40

(21)Application number: 11159971.8

(22)Date of filing:  28.03.2011
(51)International Patent Classification (IPC): 
B41J 2/045(2006.01)
(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30)Priority: 30.03.2010 JP 2010077496

(71)Applicant: Seiko Epson Corporation
Shinjuku-ku Tokyo (JP)

(72)Inventors:
  • Yoshino, Hiroyuki
    Nagano 392-8502 (JP)
  • Oshima, Atsushi
    Nagano 392-8502 (JP)
  • Tabata, Kunio
    Nagano 392-8502 (JP)
  • Miyazaki, Shinichi
    Nagano 392-8502 (JP)
  • Ide, Noritaka
    Nagano 392-8502 (JP)

(74)Representative: HOFFMANN EITLE 
Patent- und Rechtsanwälte Arabellastrasse 4
81925 München
81925 München (DE)

  


(54)Capacitive load driving circuit, ink jet printer, and fluid ejecting apparatus


(57) A capacitive load driving circuit includes: a drive waveform signal generator that generates a drive waveform signal; a subtractor that outputs a differential signal between the drive waveform signal and a feedback signal; a modulator that pulse-modulates the differential signal and outputs a modulated signal; a digital power amplifier that amplifies the power of the modulated signal and outputs a power-amplified modulated signal; a smoothing filter that is constructed by connecting an inductor and a capacitive load with a wire, smoothes the power-amplified modulated signal, and outputs a drive signal of the capacitive load; a compensator that causes a phase to precede the drive signal; and an attenuator that attenuates signal amplitude in a band at least including a modulation frequency of the modulated signal, wherein a signal output from a connecting point between the inductor and the wire is made to pass through the compensator and the attenuator and is then used as a feedback signal to the subtractor.







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