Liquid ejection apparatus
AssigneeToshiba Tec Kabushiki Kaisha
InventorNoboru NITTA
Life of this patent
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Abstract
A liquid ejection apparatus includes a liquid ejection unit with a plurality of nozzles and a corresponding plurality of capacitance-type actuators. A common electrode is connected to a first terminal of each capacitance-type actuator. Individual electrodes are respectively connected second terminals of each capacitance-type actuator. An actuator drive circuit is configured to discharge the capacitance of a first capacitance-type actuator during a period in which the capacitance of a second capacitance-type actuator is being charged. The second capacitance-type actuator is positioned electrically close to the first capacitance-type actuator on the common electrode.
Claims18
A liquid ejection apparatus, comprising:
- a liquid ejection unit including a plurality of nozzles and a corresponding plurality of capacitance-type actuators;
- a common electrode connected to a first terminal of each actuator in the plurality of capacitance-type actuators;
- a plurality of individual electrodes respectively connected a second terminal of each actuator in the plurality of capacitance-type actuators;
- and
- an actuator drive circuit configured to discharge the capacitance of a first actuator during a period in which the capacitance of a second actuator is being charged, the second actuator being positioned electrically close to the first actuator on the common electrode.
A liquid ejection apparatus, comprising:
- a liquid ejection head including a plurality of nozzles for ejecting liquid, each nozzle connected to a pressure chamber, each pressure chamber having a capacitance-type actuator that changes the pressure in the pressure chamber to eject liquid from the nozzle connected to the pressure chamber;
- a common electrode which is connected to a first terminal of each capacitance-type actuator;
- a plurality of individual electrodes respectively connected to a second terminal of each capacitance-type actuator;
- a drive circuit configured to apply drive waveforms to the plurality of individual electrodes, wherein
- a first group of capacitance-type actuators connected to a first group of individual electrodes pressurizes pressure chambers when a positive voltage is applied,
- a second group of capacitance-type actuators connected to a second group of individual electrodes pressurizes pressure chambers when a negative voltage is applied, and
- a drive waveform applied to the first group of individual electrodes and a drive waveform applied to the second group of individual electrodes are mutually inverted waveforms.
An image forming apparatus, comprising:
- an inkjet head;
- and
- a sheet conveyance path along which a sheet can be conveyed to the inkjet head, wherein
- the inkjet head includes:
- a plurality of nozzles and a corresponding plurality of capacitance-type actuators;
- a common electrode connected to a first terminal of each actuator in the plurality of capacitance-type actuators;
- a plurality of individual electrodes respectively connected a second terminal of each actuator in the plurality of capacitance-type actuators;
- and
- an actuator drive circuit configured to discharge the capacitance of a first capacitance-type actuator during a period in which the capacitance of a second capacitance-type actuator is being charged, the second actuator being positioned electrically close to the first actuator on the common electrode.
Dependencies are inferred from the claim text.