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US 12,759,307 B2Granted
Liquid ejection head and liquid ejection apparatus
AssigneeCanon Kabushiki Kaisha
InventorsManabu Ohara, Koichi Kubo, Kazuya Yoshii
Life of this patent
Estimating the term…
Abstract
In a liquid ejection head and a liquid ejection apparatus that can suppress reduction of the ejection stability, an opening of a circulation pump connected with a supply port is positioned higher than a discharge port in a vertical direction in a usage orientation of the liquid ejection head, and the discharge port is positioned higher than the supply port in the vertical direction or at the same height as that of the supply port in the vertical direction in the usage orientation of the liquid ejection head.
Claims19
A liquid ejection head, comprising:
- an ejection module that ejects a liquid;
- and
- a pressure control chamber to adjust a pressure of the liquid supplied to the ejection module, wherein
- the liquid is circulated by a circulation pump, which collects the liquid from the ejection module and supplies the liquid to the pressure control chamber, in an order from the circulation pump, the pressure control chamber, the ejection module, and the circulation pump,
- the pressure control chamber includes a discharge port to discharge the liquid to the ejection module and a supply port to which the liquid is supplied from the circulation pump,
- an opening of the circulation pump connected with the supply port is positioned higher than the discharge port in a vertical direction in a usage orientation of the liquid ejection head,
- the discharge port is positioned higher than the supply port in the vertical direction or at the same height as that of the supply port in the vertical direction in the usage orientation of the liquid ejection head,
- a first channel connects the discharge port and the ejection module with each other,
- a second channel connects the ejection module and the circulation pump with each other, and
- a bypass channel connects the first channel and the second channel with each other.
7 more elements
A liquid ejection apparatus, comprising:
- an ejection module that ejects a liquid;
- a pressure control chamber to adjust a pressure of the liquid supplied to the ejection module;
- and
- a circulation pump that collects the liquid from the ejection module and supplies the liquid to the pressure control chamber, wherein
- the liquid is circulated by the circulation pump in an order from the circulation pump, the pressure control chamber, the ejection module, and the circulation pump,
- the pressure control chamber includes a discharge port to discharge the liquid to the ejection module and a supply port to which the liquid is supplied from the circulation pump,
- an opening of the circulation pump connected with the supply port is positioned higher than the discharge port in a vertical direction in a usage orientation of the liquid ejection apparatus,
- the discharge port is positioned higher than the supply port in the vertical direction or at the same height as that of the supply port in the vertical direction in the usage orientation of the liquid ejection apparatus,
- a first channel connects the discharge port and the ejection module with each other,
- a second channel connects the ejection module and the circulation pump with each other, and
- a bypass channel connects the first channel and the second channel with each other.
8 more elements
Dependencies are inferred from the claim text.