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AssigneeSharp Kabushiki Kaisha
InventorsTakanori Kamoto, Kiyobumi Morimoto, Makoto Uehara, Hiromi Nakatsu, Masanori Kinomoto
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An ink composition is prepared in such a manner that a difference between a dynamic surface tension (mN/m) measured by a maximum bubble pressure method at a temperature of 24 to 26° C. and a static surface tension (mN/m) is within a range from 0 to 7 (mN/m). The ink composition is stored in an ink tank of an ink head, and is supplied from the ink tank to an ink chamber having a discharge port, and a voltage is applied to partitions formed by a piezoelectric material to apply a pressure by the partitions to the ink composition stored in the ink chamber, whereby a liquid droplet of the ink composition is discharged from the discharge port and the liquid droplet is deposited on a recording material to record an image.
An ink composition comprising at least a coloring agent and a medium, wherein the ink composition has a dynamic surface tension, measured by a maximum bubble pressure method at a temperature of 24 to 26° C., and a static surface tension measured at a temperature of 24 to 26° C. which satisfy the following relation (1):
An ink composition comprising at least a coloring agent and a medium,
Dependencies are inferred from the claim text.