Liquid jet recording method and apparatus and recording head therefor
AssigneeCanon Kabushiki Kaisha
InventorsToshiharu Inui, Kazuhiro Nakajima
Life of this patent
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Abstract
A liquid jet recording method using thermal energy to eject liquid from a liquid passage through an ejection outlet, the liquid passage being provided with a heat generating resistor, wherein the following conditions are satisfied: S1≧S2/3, and S2≧S3/3 where S1 is an area of the heat generating resistor, and S2 is a projected area, onto a surface having the heat generating resistor, of the liquid passage between the ejection outlet and the heat generating resistor; wherein a bubble created by the heat generating resistor communicates with ambience when the liquid is ejected.
Claims8
A liquid jet recording method comprising the steps of:
- providing a recording liquid which is normally liquid;
- providing a liquid jet recording head having a liquid passage and a liquid outlet, said liquid passage having a heat generating resistor,
- wherein the following conditions are satisfied:
- S1≧S2/3, and
- S2≧S3/3
- where S1 is an area of the heat generating resistor, S2 is a projected area, onto a surface having the heat generating resistor, of said liquid passage between said liquid outlet and said heat generating resistor, and S3 is a cross-sectional area of said liquid outlet;
- applying thermal energy to the recording liquid in the liquid passage and thereby causing film boiling of the liquid to produce a bubble for ejecting the liquid through the liquid outlet, while said liquid jet recording head is not heated, except by said heat generating resistor;
- permitting the bubble to communicate with an atmosphere adjacent the liquid outlet, wherein the bubble does not block said liquid passage when the bubble communication with the atmosphere occurs;
- and
- refilling the liquid passage after the ejecting of the liquid.
A recording apparatus comprising:
- a liquid jet recording head having a liquid passage and a liquid outlet;
- said liquid passage being provided with a heat generating resistor, wherein the following conditions are satisfied:
- S1≧S2/3, and
- S2≧S3/3
- wherein S1 is an area of the heat generating resistor, S2 is a projected area, onto a surface having the heat generating resistor, of said liquid passage between said liquid outlet and said heat generating resistor, and S3 is a cross-sectional area of said liquid outlet;
- wherein said heat generating resistor applies thermal energy to a recording liquid in the liquid passage to cause film boiling of the liquid to produce a bubble for ejecting the liquid through the liquid outlet, while said liquid jet recording head is not heated, except by said heat generating resistor, wherein the recording liquid is normally liquid;
- a driving circuit for driving said heat generating resistor to permit the bubble to communicate with an atmosphere adjacent the liquid outlet, wherein the bubble does not block said liquid passage when the bubble communication with the atmosphere occurs.
A liquid jet recording head, comprising:
- a liquid outlet;
- and
- a liquid passage, said liquid passage being provided with a heat generating resistor, wherein the following conditions are satisfied:
- S1≧S2/3, and
- S2≧S3/3
- wherein S1 is an area of the heat generating resistor, S2 is a projected area, onto a surface having the heat generating resistor, of said liquid passage between said liquid outlet and said heat generating resistor, and S3 is a cross-sectional area of said liquid outlet;
- wherein said heat generating resistor applies thermal energy to a recording liquid in the liquid passage to cause film boiling of the liquid to produce a bubble for ejecting the liquid through the liquid outlet, while said liquid jet recording head is not heated, except by said heat generating resistor, wherein the recording liquid is normally liquid;
- wherein said heat generating resistor is driven to permit the bubble to communicate with an atmosphere adjacent to the liquid outlet, and wherein the bubble does not block said liquid passage when the bubble communication with the atmosphere occurs.
Dependencies are inferred from the claim text.