Liquid ejection head and liquid ejection apparatus
AssigneeCanon Kabushiki Kaisha
InventorYoshiyuki Nakagawa
Life of this patent
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Abstract
A liquid ejection head including: an ejection port portion with an ejection port configured to eject liquid in an ejection direction; a pressure chamber that includes therein an energy-generating element to eject the liquid from the ejection port; a supply channel configured to supply the liquid to the pressure chamber; a collecting channel configured to collect the liquid from the pressure chamber; and a pump configured to cause the liquid in the collecting channel to flow into the supply channel, wherein Fratio is 1.4 or less.
Claims15
A liquid ejection head comprising:
- an ejection port portion with an ejection port configured to eject liquid in an ejection direction at a first end portion;
- a pressure chamber that includes therein an energy-generating element configured to generate energy required to eject the liquid from the ejection port and communicates with the ejection port portion at a second end portion opposite the first end portion;
- a supply channel configured to supply the liquid to the pressure chamber;
- a collecting channel configured to collect the liquid from the pressure chamber;
- and
- a pump configured to cause the liquid in the collecting channel to flow into the supply channel,
- wherein Fratio represented by the following formula is 1.4 or less:
- F
- ratio
- =
- 1.619
- ×
- (
- H
- -
- 0.34
-
- P
- -
- 0.66
-
- W
- )
- -
- 0.1569
- ×
- log
-
- (
- U
- x
- /
- U
- v
- )
- -
- 0.256
- wherein W [μm] denotes a length of the ejection port in a flow direction of the liquid in the pressure chamber, P [μm] denotes a length of the ejection port portion in an ejection direction of the liquid from the ejection port, H [μm] denotes a height of the pressure chamber on an upstream side in the flow direction of the liquid in the pressure chamber, Uv [m/s] denotes an evaporation speed in the ejection port, and Ux [m/s] denotes a flow velocity of the liquid flowing through the pressure chamber.
A liquid ejection apparatus comprising a liquid ejection head comprising:
- an ejection port portion with an ejection port configured to eject liquid in an ejection direction at a first end portion;
- a pressure chamber that includes therein an energy-generating element configured to generate energy required to eject the liquid from the ejection port and communicates with the ejection port portion at a second end portion opposite the first end portion;
- a supply channel configured to supply the liquid to the pressure chamber;
- a collecting channel configured to collect the liquid from the pressure chamber;
- and
- a pump configured to cause the liquid in the collecting channel to flow into the supply channel,
- wherein Fratio represented by the following formula is 1.4 or less:
- F
- ratio
- =
- 1.619
- ×
- (
- H
- -
- 0.34
-
- P
- -
- 0.66
-
- W
- )
- -
- 0.1569
- ×
- log
-
- (
- U
- x
- /
- U
- v
- )
- -
- 0.256
- wherein W [μm] denotes a length of the ejection port in a flow direction of the liquid in the pressure chamber, P [μm] denotes a length of the ejection port portion in an ejection direction of the liquid from the ejection port, H [μm] denotes a height of the pressure chamber on an upstream side in the flow direction of the liquid in the pressure chamber, Uv [m/s] denotes an evaporation speed in the ejection port, and Ux [m/s] denotes a flow velocity of the liquid flowing through the pressure chamber.
Dependencies are inferred from the claim text.