Canon Kabushiki Kaisha

Soichi Nagai

Tomohiro Yamashita

Masashi Ogasawara

Masashi Yamamoto

Fumiaki Fujioka

Otome Yamashita

Yuko Negishi

An ink jet recording method comprising ejecting an ink from a recording head to record an image on a recording medium using an ink jet recording apparatus. The ink jet recording apparatus includes a main tank having an air communication part, a sub tank, and a recording head. The ratio of the maximum ink storage amount of the main tank to the maximum ink storage amount of the sub tank is 3.0 or more to 50.0 or less. The temperature of the ink in the sub tank is higher than the temperature of the ink in the main tank. The ink contains a coloring material and a particular surfactant.

Ink jet recording method and ink jet recording apparatus

An ink jet recording method uses an apparatus including plural aqueous inks including cyan, magenta and yellow inks; a recording head that thermally ejects the inks; a first ink storage portion having an atmosphere communicating portion; a second ink storage portion which is a resinous housing and is directly bonded to the head; and a tube that supplies the inks from the first to second ink storage portions and includes first, second and third tubes corresponding to the respective inks, the second tube having a portion sandwiched between and joined to the first and third tubes. The method includes ejecting the inks from the head to record an image on a recording medium. The difference between the maximum and minimum values of water molar fractions of the cyan, magenta and yellow inks is 5.0% or less. The tube corresponding to the magenta ink is the second tube.

An aqueous ink set for ink jet including a combination of a first ink and a second ink. The first ink includes a self-dispersible pigment to a particle surface of which a functional group that includes a phosphonic acid group is bonded, wherein the redispersion viscosity of the first ink is 5 mPa&#xb7;s or less. The second ink includes an anionic dye, a lithium ion, and a sodium ion, wherein the total concentration of the lithium ion and the sodium ion in the second ink is 0.050 mol/L or more, and the proportion of the concentration of the lithium ion in the total concentration of the lithium ion and the sodium ion in the second ink is 45% or more to 85% or less.

Aqueous ink set, ink jet recording method and ink jet recording apparatus

An ink jet recording method comprising ejecting an ink from a recording head to record an image on a recording medium using an ink jet recording apparatus. The ink jet recording apparatus includes a main tank, a sub tank, and a recording head. The ratio of the maximum ink storage amount of the main tank to the maximum ink storage amount of the sub tank is 3.0 or more to 50.0 or less. The ink contains a pigment and a particular water-soluble organic solvent. The ratio of the water-soluble organic solvent content to the pigment content is 2.0 or more to 10.0 or less. The ink has a temperature at which the ratio of the viscosity of the ink in the recording head to the viscosity of the ink at a temperature of 25&#xb0; C. is 0.8 or less.

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Kawasaki, Japan

Soichi Nagai