Ink-jet printing head
AssigneeBrother Kogyo Kabushiki Kaisha
InventorsAtsushi Ito, Shin Hasegawa
Life of this patent
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Abstract
An ink-jet printing head having a cavity unit, the cavity unit including a plurality of nozzles for ejecting an ink, a plurality of pressure chambers communicating with the respective nozzles, a common manifold chamber for distributing the ink into the plurality of pressure chambers, and a flexible plate having the plurality of nozzles and including a wall portion which partly defines the common manifold chamber and which constitutes a damper portion, wherein the damper portion absorbs a pressure wave of the ink propagating from each selected one of the pressure chambers to the common manifold chamber, when the ink in each selected pressure chamber is pressurized to eject the ink from the corresponding nozzle.
Claims11
An ink-jet printing head having a cavity unit, said cavity unit comprising:
- a plurality of nozzles for ejecting an ink;
- a plurality of pressure chambers communicating with the respective nozzles;
- a common manifold chamber for distributing the ink into the plurality of pressure chambers;
- and
- a flexible plate having said plurality of nozzles and including a wall portion which partly defines said common manifold chamber and which constitutes a damper portion,
- wherein said damper portion absorbs a pressure wave of the ink propagating from each selected one of said pressure chambers to said common manifold chamber, when the ink in said each selected pressure chamber is pressurized to eject the ink from the corresponding nozzle, and
- wherein said flexible plate comprises a gas-permeable resin material, and said wall portion which partly defines said common manifold chamber comprises a gas-impermeable film which prevents permeation of air into the common manifold chamber through the flexible plate.
An ink-jet printing head having a cavity unit, said cavity unit comprises:
- a plurality of nozzles for ejecting an ink;
- a plurality of pressure chambers communicating with the respective nozzles;
- a common manifold chamber for distributing the ink into the plurality of pressure chambers;
- and
- a flexible plate having said plurality of nozzles and comprising a wall portion which partly defines said common manifold chamber and which constitutes a damper portion,
- wherein said flexible plate further comprising at least one weak portion which is formed generally along said common manifold chamber and which is configured to permit easier deformation of said damper portion than when said flexible plate does not comprise said at least one weak portion, and
- wherein said damper portion is configured to absorb a pressure wave of the ink propagating from each selected one of said pressure chambers to said common manifold chamber when the ink in said each selected one of said pressure chamber is pressurized to eject the ink from the corresponding nozzle.
Dependencies are inferred from the claim text.