Print Head, Liquid Ejection Apparatus, And Piezoelectric Element Control Circuit
AssigneeSeiko Epson Corporation
InventorsTomoko HARA, Motonori CHIKAMOTO
Life of this patent
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Abstract
A print head includes a piezoelectric element that includes a first electrode supplied with a drive signal and a second electrode supplied with a reference voltage signal and is displaced by a difference in electric potential between the first electrode and the second electrode, a cavity that is filled with a liquid ejected from a nozzle along with the displacement of the piezoelectric element, a vibration plate that is disposed between the cavity and the piezoelectric element, a switch circuit that switches between supplying and not supplying the drive signal to the first electrode, and a low pass filter circuit that is electrically connected in parallel with the switch circuit.
Claims15
A print head comprising:
- a piezoelectric element that includes a first electrode supplied with a drive signal and a second electrode supplied with a reference voltage signal and is displaced by a difference in electric potential between the first electrode and the second electrode;
- a cavity that is filled with a liquid ejected from a nozzle along with the displacement of the piezoelectric element;
- a vibration plate that is disposed between the cavity and the piezoelectric element;
- a switch circuit that switches between supplying and not supplying the drive signal to the first electrode;
- and
- a low pass filter circuit that is electrically connected in parallel with the switch circuit.
A liquid ejection apparatus comprising:
- a drive circuit that outputs a drive signal;
- a piezoelectric element that includes a first electrode supplied with the drive signal and a second electrode supplied with a reference voltage signal and is displaced by a difference in electric potential between the first electrode and the second electrode;
- a cavity that is filled with a liquid ejected from a nozzle along with the displacement of the piezoelectric element;
- a vibration plate that is disposed between the cavity and the piezoelectric element;
- a switch circuit that switches between supplying and not supplying the drive signal to the first electrode;
- and
- a low pass filter circuit that is electrically connected in parallel with the switch circuit.
A piezoelectric element control circuit controlling a piezoelectric element of a print head including the piezoelectric element that includes a first electrode supplied with a drive signal and a second electrode supplied with a reference voltage signal and is displaced by a difference in electric potential between the first electrode and the second electrode, a cavity that is filled with a liquid ejected from a nozzle along with the displacement of the piezoelectric element, and a vibration plate that is disposed between the cavity and the piezoelectric element, the piezoelectric element control circuit comprising:
- a switch circuit that switches between supplying and not supplying the drive signal to the first electrode;
- and
- a low pass filter circuit that is electrically connected in parallel with the switch circuit.
Dependencies are inferred from the claim text.