| 摘要 |
In an n-th primary scanning (forward trip) the rasters by white circle dots are formed. After this primary scanning, printing paper is conveyed toward a secondary-scanning-direction downstream side by the secondary scanning distance which is the same as the interval d between dots, and in the (n+1)-th primary scanning (backward trip) after the conveyance, the rasters by black circle dots are formed. Subsequently, the printing paper is conveyed toward the secondary-scanning-direction downstream side by a secondary scanning distance of (2N-1).d, and in the (n+2)-th primary scanning (forward trip) after the conveyance and the (n+3)-th primary scanning (forward trip) after the conveyance by a secondary scanning distance d, white circle and black circle dots are formed, respectively. Thus, an image is printed in units of two adjacent rasters formed by the same nozzles.
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