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US 6,474,803 B1Granted
Ink, ink set, ink cartridge, recording unit, image recording method and image recording apparatus
AssigneeCanon Kabushiki Kaisha
InventorsKoromo Shirota, Shoji Koike, Shinichi Hakamada
Life of this patent
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Abstract
Ink which can be rarely not discharged from an orifice after a pause of recording in diversified environments for use or even when a diameter of the orifice is reduced. This ink contains water-soluble coloring material, bis-hydroxyethyl sulfone and urea in an aqueous solvent.
Claims3
An image recording method comprising the steps of:
- providing an image recording apparatus comprising
- a) a recording unit provided with
- i) an ink housing section containing an ink,
- ii) a recording head for ejecting the ink from an orifice to a recording medium, and
- iii) means for supplying the ink from the ink housing section to the recording head;
- and
- b) means for operating the recording head to eject the ink to a recording medium in response to a recording signal;
- and
- operating said image recording apparatus, discharging the ink from an orifice and adhering the ink to an image recording region on a recording medium,
- wherein the ink contains a water-soluble coloring material, bis-hydroxyethyl sulfone and urea in an aqueous medium, and wherein the orifice has a size capable of ejecting 0.1 to 40 picoliters of an ink with one ejection operation.
7 more elements
An image recording apparatus comprising
- a) a recording unit provided with
- i) an ink housing section containing an ink,
- ii) a recording head for ejecting an ink from an orifice to a recording medium, and
- iii) means for supplying the ink in the ink housing section to the recording head;
- and
- b) means for allowing said recording unit to eject the ink in response to a recording signal,
- wherein the ink contains a water-soluble coloring material, bis-hydroxyethyl sulfone and urea in an aqueous medium, and the orifice has a size capable of ejecting 0.1 to 40 picoliters of an ink with one ejection operation.
4 more elements
A recording unit comprising:
- an ink housing section containing an ink which contains a water-soluble coloring material, bis-hydroxyethyl sulfone and urea in an aqueous medium;
- a recording head for discharging said recording ink from an orifice to a recording medium;
- and
- means for supplying said ink in the ink housing section to said recording head,
- wherein said orifice has a size capable of discharging 0.1 to 40 picoliters of ink with a single discharging operation.
2 more elements
Dependencies are inferred from the claim text.