Liquid ejection head and liquid ejection apparatus
AssigneeToshiba Tec Kabushiki Kaisha
InventorsMengfei Wong, Ryutaro Kusunoki
Life of this patent
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Abstract
According to one embodiment, a liquid ejection head includes a pressure chamber that contains a liquid, an actuator to change the pressure in the pressure chamber according to an applied drive signal, and a drive circuit to apply a first drive signal to the actuator when a single droplet is to be ejected from the pressure chamber and a second drive signal to the actuator when two or more droplets are to be ejected in series from the pressure chamber. The first drive signal has a first auxiliary pulse before a first ejection pulse. The second drive signal has a second auxiliary pulse before the first ejection pulse. A pulse width of the first auxiliary pulse is greater than a pulse width of the second auxiliary pulse.
Claims20
A liquid ejection head, comprising:
- a pressure chamber configured to contain a liquid;
- an actuator configured to change pressure of the pressure chamber according to an applied drive signal;
- and
- a drive circuit configured to apply a first drive signal to the actuator when a single droplet is to be ejected from the pressure chamber and apply a second drive signal to the actuator when two or more droplets are to be ejected in series from the pressure chamber, wherein
- the first drive signal includes a first auxiliary pulse before a first ejection pulse,
- the second drive signal includes a second auxiliary pulse before the first ejection pulse, a pulse width of the first auxiliary pulse being greater than a pulse width of the second auxiliary pulse, and
- a pulse width of a second ejection pulse in the second drive signal is less than a pulse width of the first ejection pulse.
A liquid ejection apparatus, comprising:
- a pressure chamber configured to contain a liquid;
- a liquid supply device configured to supply the liquid to the pressure chamber;
- an actuator configured to change pressure of the pressure chamber according to an applied drive signal;
- and
- a drive circuit configured to apply a first drive signal to the actuator when a single droplet is to be ejected from the pressure chamber and apply a second drive signal to the actuator when two or more droplets are to be ejected in series from the pressure chamber, wherein
- the first drive signal includes a first auxiliary pulse before a first ejection pulse,
- the second drive signal includes a second auxiliary pulse before the first ejection pulse, a pulse width of the first auxiliary pulse being greater than a pulse width of the second auxiliary pulse, and
- a pulse width of a second ejection pulse in the second drive signal is less than a pulse width of the first ejection pulse.
A inkjet printer, comprising:
- an inkjet head including a pressure chamber configured to contain an ink;
- an ink cartridge configured to supply the ink to the inkjet head;
- an actuator configured to change pressure of the pressure chamber according to an applied drive signal;
- and
- a drive circuit configured to apply a first drive signal to the actuator when a single droplet is to be ejected from the pressure chamber and apply a second drive signal to the actuator when two or more droplets are to be ejected in series from the pressure chamber, wherein
- the first drive signal includes a first auxiliary pulse before a first ejection pulse,
- the second drive signal includes a second auxiliary pulse before the first ejection pulse, a pulse width of the first auxiliary pulse being greater than a pulse width of the second auxiliary pulse, and
- a pulse width of a second ejection pulse in the second drive signal is less than a pulse width of the first ejection pulse.
Dependencies are inferred from the claim text.