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US 6,280,020 B1Granted
Ink-jet head and ink-jet printing apparatus
AssigneeCanon Kabushiki Kaisha
InventorsMasayoshi Tachihara, Michinari Mizutani
Life of this patent
Estimating the term…
Abstract
In order to enable high speed printing with maintaining reliability of ink ejection, an auxiliary hole is provided in an upper wall forming a liquid passage. An opening area of the auxiliary hole is set to be greater than or equal to three times of an opening area of an ejection opening, and a minimum distance between the auxiliary hole and the ejection opening is set to be greater than or equal to three times of a height of the liquid passage.
Claims16
An ink-jet head for ejecting ink, comprising:
- an ink supply passage;
- a plurality of ink passages each communicating with said supply passage, a plurality of ejection openings provided at respective said ink passages, respective electrothermal transducers located in opposition to respective said ejection openings for ejecting ink from said ejection openings by generating a bubble according to thermal energy applied to ink within said ink passages, wherein
- said ink passages are designed for supplying ink to respective said ejection openings;
- and
- an auxiliary hole opened to outside, provided in an upper wall portion of one of said plurality of ink passages and in correspondence to a single one of said ejection openings,
- wherein an opening area of said auxiliary hole is greater than or equal to three times of an opening area of said ejection opening, and
- wherein a minimum distance between said auxiliary hole and said ejection opening is greater than or equal to three times of a height of said ink passage.
4 more elements
An ink-jet head comprising:
- an ink supply passage;
- a plurality of ink passages branched from said ink supply passage;
- a plurality of ejection openings provided at respective tip ends of said ink passages;
- a thermal energy generating means for generating thermal energy used for ejecting ink from said ejection openings;
- and
- a dummy hole portion for buffering pressure variation and vibration of ink provided between a branching portion between said ink supply passage and said ink passages and said thermal energy generating means, in one of said plurality of ink passages and in correspondence to a single one of said ejection openings,
- wherein an opening area of said dummy hole portion is not less than three times an opening area of said ejection opening, and a minimum distance between said dummy hole portion and said ejection opening is not less than three times a height of said ink passage.
4 more elements
Dependencies are inferred from the claim text.