| 摘要 |
The invention provides a recording unit and an image recording apparatus of a configuration in which the black image and character formed by the black ink in the presence of the color ink satisfy various properties such as a high optical density, high image quality and high image fastness and which also enables prevention of bleeding and white haze and saving of the ink consumption. There is provided an ink jet head employing an ink set including black ink and color inks, in which the black ink contains a salt, an aqueous medium and a coloring material dispersed in the aqueous medium by the function of an ionic radical, and at least one of the color inks contains a polyvalent metal salt capable, when mixed with the black ink, of impairing the dispersion stability of the coloring material in the black ink, and the ink jet head has a configuration, in a portion for discharging the polyvalent metal salt containing ink used as the color ink, utilizing a discharge method in which the bubble generated in the ink in the ink flow path is opened through to the discharge port at the ink discharge. <IMAGE> <IMAGE> <IMAGE> <IMAGE> |
