Liquid ejection head, method, and device

A method for ejecting liquid from a liquid ejection head that includes:

• a nozzle plate including a nozzle,
• a pressure chamber that is capable of storing liquid and communicates with the nozzle, a volume of the pressure chamber being varied to eject the liquid from the nozzle, and
• an actuator configured to vary the volume of the pressure chamber in response to a drive signal, the method comprising:
• generating the drive signal that includes n ejection waveforms (n is an integer of 2 or more) each including an ejection pulse for ejecting the liquid, the ejection pulse including an expansion portion for expanding the volume of the pressure chamber and a contraction portion that is subsequent to the expansion portion for contracting the volume of the pressure chamber, wherein
• at least one of the ejection waveforms includes a damping pulse that is subsequent to the ejection pulse and includes a contraction portion for contracting the volume of the pressure chamber and an expansion portion that is subsequent to the contraction portion for expanding the volume of the pressure chamber, and
• the ejection waveforms include consecutive ejection waveforms that are separated by an intermediate time period that is in a range of 0.2 times or more and 2 times or less a half cycle of a natural vibration period of the liquid in the pressure chamber.

A liquid ejection device comprising:

• a plurality of conveyance rollers configured to convey a medium;
• and
• a liquid ejection head configured to eject liquid to the medium conveyed by the conveyance rollers, the liquid ejection head including:
• a nozzle plate including a nozzle,
• a pressure chamber that is capable of storing liquid and communicates with the nozzle, a volume of the pressure chamber being varied to eject the liquid from the nozzle,
• an actuator configured to vary the volume of the pressure chamber in response to a drive signal, and
• a drive circuit configured to generate the drive signal, wherein
• the drive signal includes n ejection waveforms (n is an integer of 2 or more) each including an ejection pulse for ejecting the liquid, the ejection pulse including an expansion portion for expanding the volume of the pressure chamber and a contraction portion that is subsequent to the expansion portion for contracting the volume of the pressure chamber,
• at least one of the ejection waveforms includes a damping pulse that is subsequent to the ejection pulse and includes a contraction portion for contracting the volume of the pressure chamber and an expansion portion that is subsequent to the contraction portion for expanding the volume of the pressure chamber, and
• the ejection waveforms include consecutive ejection waveforms that are separated by an intermediate time period that is in a range of 0.2 times or more and 2 times or less a half cycle of a natural vibration period of the liquid in the pressure chamber.