Patent ID: 7275806
Filing Date: 2007-10-02
Classification: B41J

Abstract:
1. An inkjet recording method comprising the step of: forming a color image with color inks and an invisible ink onto a recording medium by while scanning a first recording head multiple times on a same recording area of the recording medium, forming a thinned-out image according to a thinning-out pattern without regularity in each scanning, the first recording head having a plurality of nozzle sections for jetting color inks, and jetting an invisible ink from a second recording head in accordance with an adhering amount of the color inks per unit area on the recording medium, wherein a nozzle pitch of the first recording head is from 10 to 50 μm, the color inks comprise at least inks of cyan, magenta, yellow and black, the respective color inks contain pigments, at least one organic solvent with high boiling point and water, a dot formed by jetting the color inks from the first recording head has a size of 10 to 50 μm on the recording medium, the recording medium has a transferred amount at 0.04 seconds of absorption time by Bristow method of 10 ml/m the invisible ink contains water, at least one organic solvent with high boiling point and a resin fine particle, and wherein an adhering amount of the invisible ink at an area where the adhering amount of the color inks is not more than a predetermined amount is more than the adhering amount of the invisible ink at an area where the adhering amount of the color inks is more than the predetermined amount.