Liquid ejection apparatus and control method
AssigneeCanon Kabushiki Kaisha
InventorsYOSHIHIRO HAMADA, KEIJI TOMIZAWA, TAKATSUGU MORIYA, FUMI TANAKA, KOICHI ISHIDA, YUJI NUKUI, SHUZO IWANAGA, YUGO YAMAMOTO
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Abstract
Provided is a technique for achieving stable ejection characteristics. To this end, during liquid ejection, a potential difference ΔVa is generated between an electrode and an opposing electrode, the potential difference ΔVa being different between a liquid ejection head in a brand-new state and a liquid ejection head which has performed a kogation removal operation before.
Claims13
A liquid ejection apparatus to which an ejection unit is attachable, the ejection unit having
- a heat generating resistor configured to generate energy for ejecting liquid by generating heat upon energization,
- a first electrode provided at a protection part covering and protecting the heat generating resistor, and
- a second electrode capable of being electrically conductive to the first electrode via the liquid,
- the liquid ejection apparatus comprising a control unit configured to control the ejection unit attached to the liquid ejection apparatus, wherein
- by applying voltage between the first electrode and the second electrode, the control unit is capable of executing a kogation removal process for removing deposited kogation by dissolving a surface of the first electrode into the liquid, and
- while the ejection unit performs a liquid ejection operation, the control unit generates a potential difference between the first electrode and the second electrode, the potential difference being different between a case where the ejection unit has performed the kogation removal process before and a case where the ejection unit has not performed the kogation removal process before.
A method for controlling a liquid ejection apparatus to which an ejection unit is attachable, the ejection unit having
- a heat generating resistor configured to generate energy for ejecting liquid by generating heat upon energization,
- a first electrode provided at a protection part covering and protecting the heat generating resistor, and
- a second electrode capable of being electrically conductive to the first electrode via the liquid,
- the method comprising a kogation removal step of applying voltage between the first electrode and the second electrode and removing deposited kogation by dissolving a surface of the first electrode into the liquid, wherein
- while the ejection unit performs a liquid ejection operation, a potential difference is generated between the first electrode and the second electrode, the potential difference being different between a case where the ejection unit has performed the kogation removal step before and a case where the ejection unit has not performed the kogation removal step before.
Dependencies are inferred from the claim text.