| 摘要 |
A color ink jet printer having high throughput and a high-quality printing capability is disclosed. Nozzle arrays for spouting black ink, cyan ink, magenta ink, and yellow ink are placed on a print head. Each of the nozzle arrays has N nozzles arranged in a vertical scanning direction at intervals of k times the dot pitch of a print image. The nozzles are driven at intermittent timing during the horizontal scanning of the print head for forming dots at intervals of s times the dot pitch. At the termination of the horizontal scanning, vertical scanning is executed by a given distance. The vertical scanning distance L is set so as to satisfy the following expression: L=N/(sxDxk)wherein s is an arbitrary integer greater than one and less than N, and a submultiple of N, k is an arbitrary integer greater than one and less than N having prime relation with N/s, and D is the number of nozzles existing per unit distance in the vertical scanning direction.
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