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AssigneeBrother Kogyo Kabushiki Kaisha
InventorsJunichiro Sugimoto, Masashi Tsuda, Ryuji Kato, Narumi Koga, Masaya Fujioka, Shunichi Higashiyama
Estimating the term…
A water-based ink for ink-jet recording enables the expression of sharp text and lines in high density black, and the formation of a high quality gradation image in which the graininess is reduced in a black image of medium to high lightness. The inks include a color ink (A) and a color ink (B) each of which independently has a lightness index L* according to the L* a* b* calorimetric system of about 60 or less. The color ink (A) and the color ink (B) satisfy the following expression (I): about 120°≦|α−β| about ≦240° (I) wherein α is the hue angle of the color ink (A) and β is the hue angle of the color ink (B). The chroma C* of a hue obtained by the combination of the color ink (A) and the color ink (B) is about 30 or less.
A water-based ink combination for ink-jet recording comprising a color ink (A) and a color ink (B) each of which independently has a lightness index L* according to the L* a* b* calorimetric system of about 60 or less, wherein the color ink (A) and the color ink (B) satisfy a color relationship of the following expression (I):
A water-based ink set for ink-jet recording comprising a color ink (A) and a color ink (B) each of which independently has a lightness index L* according to the L* a* b* colorimetric system of about 60 or less,
An ink-jet recording method for forming a black image of a low lightness to a high lightness, comprising printing the image by overprinting a water-based color ink (A) and a water-based color ink (B), wherein each of the color ink (A) and color ink (B) independently has a lightness index L* according to the L* a* b* colorimetric system of about 60 or less, wherein the color ink (A) and the color ink (B) satisfy a color relationship of the following expression (I):
An ink-jet recording apparatus comprising ink cartridge receivers for receiving designated ink cartridges and nozzles for application of the inks to a recording material, wherein the cartridge receivers receive at least a color ink (A) and a color ink (B) each of which independently has a lightness index L* according to the L* a* b* colorimetric system of about 60 or less, wherein the color ink (A) and the color ink (B) satisfy a color relationship of the following expression (I):
Dependencies are inferred from the claim text.