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US 2026/0070329 A1Published application
Liquid ejection apparatus and control method
AssigneeCanon Kabushiki Kaisha
InventorsFUMI TANAKA, SHUZO IWANAGA, KEIJI TOMIZAWA, KOICHI ISHIDA, YUZURU ISHIDA, YUJI NUKUI, YUGO YAMAMOTO, KOJI TAKASE
Life of this patent
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Abstract
Provides a technique that can suppress occurrence of the image unevenness and the like due to a burnt ink on a heater surface. To this end, between aging processing and printing processing, preprocessing is performed with a potential difference between a potential difference during aging processing and a potential difference during printing processing.
Claims26
A liquid ejection apparatus, comprising:
- an ejection unit mountable therein, including a heat generation resistor configured to generate energy to eject a liquid by generating heat by applying power, a first electrode provided to a protection unit configured to cover and protect the heat generation resistor, and a second electrode conductible with the first electrode via the liquid;
- and
- a control unit configured to control a potential difference between the first electrode and the second electrode to a predetermined value by changing at least either one of potentials of the first electrode and the second electrode and control the mounted ejection unit, wherein
- the control unit executes
- aging processing to accumulate kogation on the first electrode by generating a first potential difference between the first electrode and the second electrode and performing ejection that does not contribute to printing on a printing medium from the ejection unit,
- preprocessing to perform ejection that does not contribute to the printing on the printing medium from the ejection unit by generating a second potential difference, which is different from the first potential difference, after the aging processing, and
- printing processing to eject the liquid from the ejection unit to the printing medium and perform printing by generating a third potential difference, which is different from the first potential difference and the second potential difference, between the first electrode and the second electrode after the preprocessing.
4 more elements
A control method of a liquid ejection apparatus, the liquid ejection apparatus including
- an ejection unit mountable therein, including a heat generation resistor configured to generate energy to eject a liquid by generating heat by applying power, a first electrode provided to a protection unit configured to cover and protect the heat generation resistor, and a second electrode conductible with the first electrode via the liquid, and
- a control unit configured to control a potential difference between the first electrode and the second electrode to a predetermined value by changing at least either one of potentials of the first electrode and the second electrode and control the mounted ejection unit, the control method comprising:
- performing aging processing to accumulate kogation on the first electrode by generating a first potential difference between the first electrode and the second electrode and performing ejection that does not contribute to printing on a printing medium from the ejection unit,
- determining whether the kogation is adhered by the aging processing;
- performing preprocessing to perform ejection that does not contribute to the printing on the printing medium from the ejection unit by generating a second potential difference, which is different from the first potential difference, after the aging processing;
- determining whether the kogation is evenly adhered by the preprocessing;
- and
- performing printing processing to eject the liquid from the ejection unit to the printing medium and perform printing by generating a third potential difference, which is different from the first potential difference and the second potential difference, between the first electrode and the second electrode after the preprocessing.
5 more elements
A liquid ejection apparatus, comprising:
- an ejection unit mountable therein, including a heat generation resistor configured to generate energy to eject a liquid by generating heat by applying power, a first electrode provided to a protection unit configured to cover and protect the heat generation resistor, and a second electrode conductible with the first electrode via the liquid;
- and
- a control unit configured to control a potential difference between the first electrode and the second electrode to a predetermined value by changing at least either one of potentials of the first electrode and the second electrode and control the mounted ejection unit, wherein
- the control unit executes
- aging processing to accumulate kogation on the first electrode by generating a first potential difference between the first electrode and the second electrode and performing ejection that does not contribute to printing on a printing medium from the ejection unit,
- printing processing to eject the liquid from the ejection unit to the printing medium and perform printing by generating a second potential difference between the first electrode and the second electrode after the aging processing, and
- preprocessing to perform ejection that does not contribute to the printing on the printing medium from the ejection unit by generating a third potential difference, which is the same as the second potential difference, between the first electrode and the second electrode before the printing processing.
4 more elements
A control method of a liquid ejection apparatus, the liquid ejection apparatus including
- an ejection unit mountable therein, including a heat generation resistor configured to generate energy to eject a liquid by generating heat by applying power, a first electrode provided to a protection unit configured to cover and protect the heat generation resistor, and a second electrode conductible with the first electrode via the liquid, and
- a control unit configured to control a potential difference between the first electrode and the second electrode to a predetermined value by changing at least either one of potentials of the first electrode and the second electrode and control the mounted ejection unit, the control method comprising:
- performing aging processing to accumulate kogation on the first electrode by generating a first potential difference between the first electrode and the second electrode and performing ejection that does not contribute to printing on a printing medium from the ejection unit,
- determining whether the kogation is adhered by the aging processing;
- performing printing processing to eject the liquid from the ejection unit to the printing medium and perform printing by generating a second potential difference between the first electrode and the second electrode after the aging processing;
- performing preprocessing to perform ejection that does not contribute to the printing on the printing medium from the ejection unit by generating a third potential difference, which is the same as the second potential difference, between the first electrode and the second electrode before the printing processing;
- and
- determining whether the kogation is evenly adhered by the preprocessing.
5 more elements
Dependencies are inferred from the claim text.