Color image forming device

Abstract

Abstract PURPOSE:To enhance saturation and color reproducibility, in a color image forming apparatus having printing heads of yellow (Y), magenta (M), cyan (C) and black (K), by making the dot diameter of K smaller than that of each of other colors and making the dot diameter of Y larger than that of each of the residual colors. CONSTITUTION:For example, at the time of pixel density of 300 dpi, the printing dot diameter of an ink droplet is set to 120mum in all of colors Y, M, C, K heretofore but, in this case, the dot diameter of K-ink is made small by 10% to be set to about 108 mum and the dot diameter of Y-ink is made large by 10% to be set to about 132 mum. As mentioned above, by reducing the dot diameter of the K-ink, the lowering in saturation is suppressed and image quality is enhanced. Further, by increasing the dot diameter of the Y-ink, the density difference with the other inks is corrected and the color reproducibility of color mixture is enhanced. As a means reducing or increasing a dot diameter, heads having a nozzle diameters respectively obtaining required dot diameters are used or the pressure of the pump 2 feeding ink to each head under pressure may be changed.

Inventors

• 👤 Makoto Kikukawa
• 👤 眞 菊川

Bibliographic Details