Repression of the image defect and Improvement of the essential quality are necessary for increase in image quality in the ink jet technology. To control an image defect, the stability of the print head, the manufacture precision, the way of driving it, the optimization of the recovery system, the improvement of the precision of the printer mechanism, and so on are important subjects. To improve the essential quality, print heads, ink systems, record media must be improved so that sharpness of the image, granularity, expression of gradation, coloring performance are satisfied at the same time. It expects that ink jet technology is popularized in the broader use due to these rapid technological innovations.
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