Print head, liquid ejection apparatus, and piezoelectric element control circuit
AssigneeSeiko Epson Corporation
InventorsTomoko Hara, Motonori Chikamoto
Life of this patent
Estimating the term…
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 such that (i) inputs of the low pass filter circuit and the switch circuit are connected together and to the drive signal and (ii) outputs of the low pass filter circuit and the switch circuit are connected together.
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 such that (i) inputs of the low pass filter circuit and the switch circuit are connected together and to the drive signal and (ii) outputs of the low pass filter circuit and the switch circuit are connected together.
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 such that (i) inputs of the low pass filter circuit and the switch circuit are connected together and to the drive signal and (ii) outputs of the low pass filter circuit and the switch circuit are connected together.
Dependencies are inferred from the claim text.