Patent ID: 6578958
Filing Date: 2003-06-17
Classification: B41J

Abstract:
An inkjet recording apparatus comprising:(A) a recording head including, plural nozzles configured to selectively discharge a drop of an ink to form an image on a receiving material at an image forming area, and plural pressure generators configured to apply a pressure to corresponding nozzles of the plural nozzles; (B) an ink container containing the ink, the ink including a pigment at a first pigment content, a volatile solvent and a solvent having a low volatility, and the ink having a pigment content decreasing property such that the pigment content decreases at a meniscus portion of the ink in the plural nozzles when the ink is allowed to settle; and (C) a driver configured to actuate at least one of the plural pressure generators by applying a first pulse to selectively discharge the ink from at least one of the plural nozzles, wherein the driver actuates at least one of the plural pressure generators at a predetermined timing by applying a second pulse such that the ink at the meniscus portion is vibrated to an extent such that the ink is not discharged from a corresponding nozzle of the plural nozzles, and further, wherein the ink further has a first zeta potential not less than 20 mV and a property that when due to evaporation of at least the volatile solvent a condensed ink is produced that has a second pigment content increases from 1.25 to 1.50 times the first pigment content, the condensed ink has a second zeta 5 potential, and an absolute value of the second zeta potential is less than an absolute value of the first zeta potential by at least 5 mV.