Liquid ejection head
AssigneeToshiba Tec Kabushiki Kaisha
InventorYasuhito KIJI
Life of this patent
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Abstract
In an embodiment, a liquid ejection head includes a nozzle plate, a pressure chamber, an actuator, and a drive circuit. The actuator varies a volume of the pressure chamber in response to a driving signal from the drive circuit. The driving signal includes an ejection waveform for ejecting liquid from a nozzle and a cancellation waveform for suppressing residual oscillation after ejection of the liquid. The ejection waveform includes voltage changes in stages and the cancellation waveform includes two waveform portions for suppressing residual oscillations and higher harmonic acoustic resonance frequencies.
Claims20
A liquid ejection head, comprising:
- a nozzle plate including a nozzle;
- a pressure chamber fluidly connected to the nozzle;
- an actuator configured to vary a volume of the pressure chamber in response to a driving signal;
- and
- a drive circuit configured to generate the driving signal for driving the actuator, wherein
- the driving signal generated by the drive circuit includes an ejection waveform for ejecting liquid from the nozzle and a cancellation waveform for suppressing residual oscillation after the ejection of the liquid, and
- the cancellation waveform includes a first waveform portion and a second waveform portion, and the second waveform portion cancels oscillation that has an acoustic resonance frequency higher than a main acoustic resonance frequency of the liquid in the pressure chamber and is caused by the first waveform portion.
An image forming apparatus, comprising:
- a liquid ejection head;
- and
- a sheet conveyor configured to convey a sheet to the liquid ejection head, wherein
- the liquid ejection head includes:
- a nozzle plate including a nozzle;
- a pressure chamber fluidly connected to the nozzle;
- an actuator configured to vary a volume of the pressure chamber in response to a driving signal;
- and
- a drive circuit configured to generate the driving signal for driving the actuator,
- the driving signal generated by the drive circuit includes an ejection waveform for ejecting liquid from the nozzle and a cancellation waveform for suppressing residual oscillation after the ejection of the liquid, and
- the cancellation waveform includes a first waveform portion and a second waveform portion, and the second waveform portion cancels oscillation that has an acoustic resonance frequency higher than a main acoustic resonance frequency of the liquid in the pressure chamber and is caused by the first waveform portion.
Dependencies are inferred from the claim text.