Liquid discharge apparatus and capacitive load drive circuit
AssigneeSeiko Epson Corporation
InventorsNoritaka Ide, Kunio Tabata, Shoichiro Yokoo
Life of this patent
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Abstract
A liquid discharge apparatus includes a liquid discharge head that includes a plurality of capacitive loads driven by being supplied with a drive signal and discharges a liquid by driving the plurality of capacitive loads, and a capacitive load drive circuit, in which the capacitive load drive circuit includes a correction circuit, a modulation circuit, an amplification circuit, a demodulation circuit, and a feedback circuit, and the correction circuit outputs the correction base drive signal corrected according to the number of drive capacitive loads driven by the drive signal among the plurality of capacitive loads.
Claims10
A liquid discharge apparatus comprising:
- a liquid discharge head that includes a plurality of capacitive loads driven by being supplied with a drive signal and discharges a liquid by driving the plurality of capacitive loads;
- and
- a capacitive load drive circuit that outputs the drive signal, wherein
- the capacitive load drive circuit includes
- a correction circuit that outputs a correction base drive signal obtained by correcting a base drive signal which is a base of the drive signal,
- a modulation circuit that outputs a modulation signal obtained by modulating the correction base drive signal,
- an amplification circuit that outputs an amplified modulation signal obtained by amplifying the modulation signal,
- a demodulation circuit that includes a capacitor and outputs the drive signal by demodulating the amplified modulation signal, and
- a feedback circuit that feeds back the drive signal to the correction circuit,
- the correction circuit outputs the correction base drive signal corrected according to the number of drive capacitive loads driven by the drive signal among the plurality of capacitive loads, and
- when the number of the drive capacitive loads is large, the correction circuit outputs the correction base drive signal corrected such that an amplitude of the base drive signal is reduced.
A capacitive load drive circuit that outputs a drive signal to a liquid discharge head which includes a plurality of capacitive loads to be driven by being supplied with the drive signal and discharges a liquid by driving the plurality of capacitive loads, the capacitive load drive circuit comprising:
- a correction circuit that outputs a correction base drive signal obtained by correcting a base drive signal which is a base of the drive signal;
- a modulation circuit that outputs a modulation signal obtained by modulating the correction base drive signal;
- an amplification circuit that outputs an amplified modulation signal obtained by amplifying the modulation signal;
- a demodulation circuit that includes a capacitor and outputs the drive signal by demodulating the amplified modulation signal;
- and
- a feedback circuit that feeds back the drive signal to the correction circuit, wherein
- the correction circuit outputs the correction base drive signal corrected according to the number of drive capacitive loads driven by the drive signal among the plurality of capacitive loads, and
- when the number of the drive capacitive loads is large, the correction circuit outputs the correction base drive signal corrected such that an amplitude of the base drive signal is reduced.
Dependencies are inferred from the claim text.