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US 9,308,722 B2Granted
Liquid ejection head and liquid ejection apparatus
AssigneeCanon Kabushiki Kaisha
InventorsYuzuru Ishida, Sadayoshi Sakuma, Norihiro Yoshinari, Ichiro Saito, Maki Kato, Kenji Takahashi, Yoshinori Misumi
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Abstract
In a liquid ejection head for ejecting liquid by using thermal energy, reduction of film thickness caused by elution of a protective layer when kogation on the protective layer is removed is made uniform and decrease in liquid ejection performance is suppressed. More specifically, a counter electrode is provided around a portion on which an ejection port of a flow path forming member is formed.
Claims18
A liquid ejection head comprising:
- a substrate having a heating section and a protective film that has an area overlapping with the heating section when viewed from a direction orthogonal to a face of the substrate,
- an electrode capable of generating a voltage between the protective film and the electrode;
- a flow path formed between a surface of the protective film and a surface of the electrode;
- and
- an ejection port, liquid being ejected from the ejection port with use of heat generated by the heating section via the protective film,
- wherein the protective film and the electrode are arranged such that a distance in the flow path between the area of the protective film and the electrode corresponding to the area satisfies 1<a/b≦2 when a maximum distance is set as “a” and a minimum distance is set as “b”.
3 more elements
Dependencies are inferred from the claim text.