Patent ID: 7883199
Filing Date: 2011-02-08
Classification: B41J,C09D

Abstract:
1. An ink set comprising: a plurality of inks, wherein the plurality of inks constituting the ink set is stored respectively in ink cartridges each having an ink storage portion which is brought into a hermetically-closed state, wherein the difference in specific gravity between a first ink having the largest specific gravity and a second ink having the smallest specific gravity among the plurality of inks constituting the ink set is less than 0.020, wherein an ejection orifice line which ejects the first ink and an ejection orifice line which ejects the second ink are capped with the same cap, and wherein, where a water-soluble organic solvent having the smallest specific gravity among a water-soluble organic solvent contained in the first ink and a water-soluble organic solvent contained in the second ink is defined as a first water-soluble organic solvent, and a coloring material having the largest specific gravity among a coloring material contained in the first ink and a coloring material contained in the second ink is defined as a first coloring material, a difference in specific gravity between the first water-soluble organic solvent and the first coloring material is 0.049 or less.