Ink-jet printing apparatus, ejection recovery method for ink-jet printing apparatus, and fabrication method of ink-jet printing head
AssigneeCanon Kabushiki Kaisha
InventorRyoji Inoue
Life of this patent
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Abstract
By effectively executing ejection recovery and aging process of an ink-jet printing head having a plurality of electrothermal transducers in an ink passage, ejecting characteristics including the ejecting speed and ejecting quantity of ink are more stably kept under the printing operation for ejecting the ink by driving the electrothermal transducers. For that purpose, shift values of application timings of driving pulses to be applied to heaters in the ink passage of the ink-jet printing head are changed under the ejection recovery after the ink-jet printing head is set to a printing apparatus and/or the aging process when the ink-jet printing head is fabricated.
Claims16
An ink-jet printing apparatus for printing an image on a printing medium by using an ink-jet printing head capable of ejecting ink from an ink ejection port communicating with an ink passage, and capable of generating a bubble in ink of the ink passage by the heat produced by a plurality of electrothermal transducers set to the ink passage, wherein
- control means is included which changes shift values of the heat-producing timings of the electrothermal transducers by changing shift values of driving signals to be applied to the electrothermal transducers when ejecting the ink not contributing to printing of the image from the ink-jet printing head to recover an ink ejecting condition.
An ejection recovery method for an ink-jet printing apparatus for printing an image on a printing medium by using an ink-jet printing head capable of ejecting ink from an ink ejection port communicating with an ink passage, and capable of generating a bubble in ink of the ink passage by the heat produced by a plurality of electrothermal transducers set to the ink passage, comprising the step of:
- changing shift values of driving signals to be applied to a plurality of electrothermal transducers and thereby changing shift values of heat-producing timings of the electrothermal transducers when performing ejection recovery for recovering an ink ejecting condition by ejecting the ink not contributing to printing of the image from the ink-jet printing head.
A fabrication method of an ink-jet printing head capable of ejecting ink from an ink ejection port communicating with an ink passage by generating a bubble in the ink of an ink passage by the heat produced by a plurality of electrothermal transducers set to the ink passage, comprising the step of:
- changing shift values of driving signals to be applied to the electrothermal transducers and thereby changing shift values of heat-producing timings of the electrothermal transducers when ejecting ink from the ink-jet printing head for aging process.
Dependencies are inferred from the claim text.