Ink jet device
AssigneeBrother Kogyo Kabushiki Kaisha
InventorKoji Imai
Life of this patent
Estimating the term…
Abstract
An ink jet printer stores a waveform and tables. The tables list voltages in correspondence with each of a predetermined number of consecutive ejection operations from start of a scan row. Each of the plurality of tables corresponds to a different plurality of simultaneously fired actuators. The stored waveform is modified to match the voltage listed in correspondence with the next ink ejection operation in the table that corresponds to the number of actuators that will be simultaneously fired in the next ink ejection operation. Voltage is applied to actuators of a print head based on the modified waveform.
Claims13
An ink ejecting device that ejects ink, the ink ejecting device comprising:
- a print head including a plurality of pressure chambers, actuators, and nozzles in a one-to-one correspondence with each other, each pressure chamber being in fluid communication with a corresponding nozzle and filled with ink, the actuators generating energy upon application of voltage to eject ink from the corresponding pressure chamber through the corresponding nozzle;
- a scanning mechanism that moves the print head to scan in consecutive rows;
- a drive circuit that applies voltage to the actuators;
- and
- a controller that controls the drive circuit to apply voltage selectively to the actuators to drive the print head to perform consecutive ejection operations while the scanning mechanism scans the print head in each row, the controller generating, in order to compensate for pressure fluctuations in the pressure chambers, drive waveforms used by the drive circuit for each of a predetermined number of ejection operations from the start of each row that the scanning mechanism scans the print head, the controller generating drive waveforms depending on which of the predetermined number of ejection operations is to be performed next in a present row.
An ink ejecting device that ejects ink, the ink ejecting device comprising:
- a print head including a plurality of pressure chambers, actuators, and nozzles in a one-to-one correspondence with each other, each pressure chamber being in fluid communication with a corresponding nozzle and filled with ink, the actuators generating energy upon application of voltage to eject ink from the corresponding pressure chamber through the corresponding nozzle;
- a scanning mechanism that moves the print head to scan in consecutive rows;
- a drive circuit that applies voltage to the actuators;
- a waveform memory that stores a waveform;
- a compensation feature memory that stores features that are used to modify the waveform in the waveform memory in order to compensate for pressure fluctuations in the pressure chambers;
- and
- a controller that controls the drive circuit to apply voltage selectively to the actuators to drive the print head to perform consecutive ejection operations while the scanning mechanism scans the print head in each row, the controller selecting a feature from the compensation feature memory for each of a predetermined number of ejection operations from start of each row that the scanning mechanism scans the print head, the controller selecting the features depending on which of the predetermined number of ejection operations is to be performed next in a present row and using the selected feature to modify the waveform into a modified waveform, the controller controlling the drive circuit based on the modified waveform for a corresponding ejection operation.
A method of driving an ink ejection device comprising:
- storing a waveform in a waveform memory;
- storing a table in a compensation feature memory, the table listing a feature in correspondence with each of a predetermined number of consecutive ejection operations from start of a scan row;
- modifying the waveform based on the feature listed in correspondence with an ink ejection operation to be performed next in a scan row;
- and
- applying voltage to actuators of a print head based on the modified waveform.
Dependencies are inferred from the claim text.