US 8,262,181 B2Granted

Fluid ejection device and fluid ejecting recording device including an inverse filter circuit

AssigneeSeiko Epson Corporation

InventorAtsushi Oshima

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Abstract

A fluid ejection device includes, a modulator, a digital power amplifier, a low pass filter, and an inverse filter circuit, including, a delay device, a subtracter that subtracts an output signal of the delay device from a drive waveform signal, an amplifier adapted to amplify an output signal of the subtracter, an adder that adds an output signal of the amplifier and another input signal, a first switch adapted to perform switching so as to set either one of the drive waveform signal and an output signal of the adder to be an input signal of the delay device, a second switch adapted to perform switching so as to set either one of the drive waveform signal and the output signal of the delay device to be the another input signal of the adder, and a switch connection control section that controls the first switch and the second switch.

Claims9

Dependent claims

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.

10 more elements

A fluid ejection device comprising:

a first filter circuit which applies a desired filter to a drive waveform signal;
a modulator which pulse-modulates a filtered signal filtered by the first filter circuit to form a modulated signal;
a digital power amplifier which power-amplifies the modulated signal to obtain a power-amplified modulated signal;
and
a second filter circuit which filters the power-amplified modulated signal to form a drive signal,
wherein the first 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 either the drive waveform signal or the output signal of the delay device to an output signal of the amplifier,
a first switch which inputs either the drive waveform signal or an output signal of the adder to the delay device, and
a second switch which inputs either the drive waveform signal or the output signal of the delay device to the adder.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/821,339Filed 23 Jun 2010
Priority: JP 2009-15260326 Jun 2009
Published: US 2010/0328380 A130 Dec 2010
Granted: 11 Sep 2012
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

B41J 2/04588
Control methods or devices therefor, e.g. driver circuits, control circuits: using a specific waveform
B41J 2/04541
Control methods or devices therefor, e.g. driver circuits, control circuits: specific driving circuit
B41J 2/0455
Control methods or devices therefor, e.g. driver circuits, control circuits: details of switching sections of circuit, e.g. transistors
B41J 2/04573
Control methods or devices therefor, e.g. driver circuits, control circuits: timing; Delays