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US 6,471,326 B2Granted
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.
Claims17
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 for ejecting ink provided for respective ones of said ink passages;
- and
- a plurality of electrothermal transducers located in correspondence to respective ones of said ejection openings for generating thermal energy to be applied to ink within said ink passages, respectively, and utilized to eject ink from said ejection openings, respectively,
- wherein at least one of said ink passages has a plurality of auxiliary holes opened to the outside, and
- wherein said auxiliary holes are provided in correspondence to respective ones of said ejection openings and, for each of said ink passages, opening areas of said auxiliary holes are smaller than an opening area of said respective ejection opening.
4 more elements
An ink-jet head for ejecting ink, comprising:
- an ink supply passage;
- a plurality of ink passages branched from said ink supply passage;
- a branching portion between said ink supply passage and each of said ink passages, respectively;
- a plurality of ejection openings provided at respective tip ends of said ink passages;
- and
- a plurality of electrothermal transducers located in correspondence to respective ones of said ejection openings for generating thermal energy to be applied to ink within said ink passages, respectively, and utilized to eject ink from said ejection openings, respectively,
- wherein at least one of said ink passages has a plurality of auxiliary holes for buffering pressure variation and vibration of ink provided between said respective branching portion and said respective electrothermal transducer in said ink passage, and
- wherein said auxiliary holes are provided in correspondence to respective ones of said ejection openings and, for each of said ink passages, opening areas of said auxiliary holes are smaller than an opening area of said respective ejection opening.
5 more elements
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 for ejecting ink provided for respective ones of said ink passages;
- and
- a plurality of electrothermal transducers located in correspondence to respective ones of said ejection openings for generating thermal energy to be applied to ink within said ink passages, respectively, and utilized to eject ink from said ejection openings, respectively,
- wherein at least one of said ink passages has a plurality of auxiliary holes opened to the outside, and
- wherein at least one of said auxiliary holes is located at a front side of said respective ejection opening in an ink supply direction.
4 more elements
Dependencies are inferred from the claim text.