Inkjet Printer Nozzle Boundary Alignment for Print Quality

The patent segments the printing process into multiple passes and the nozzle array into multiple nozzle units, then strategically aligns their boundaries to prevent overlapping. By dividing the printing task into separate passes and ensuring that printing pass boundaries do not coincide with nozzle unit boundaries, the patent eliminates the synergistic effect that causes streaks and banding, thereby maintaining high print quality while achieving increased resolution through multiple passes.

The patent introduces asymmetric offset positioning between printing pass boundaries and nozzle unit boundaries. Instead of aligning both boundaries to the same reference, it creates a deliberate asymmetric relationship where the boundaries are shifted relative to each other. This asymmetric arrangement ensures that printing pass boundaries never coincide with nozzle unit boundaries, preventing the exacerbation of assembling tolerance errors and maintaining uniform print quality across the entire collective head.

The patent applies local quality by treating different regions of the nozzle array differently. Specifically, it identifies the boundary regions between nozzle units as critical areas requiring special handling. By locally adjusting the positioning of printing pass boundaries to avoid coinciding with nozzle unit boundaries, the patent maintains ink ejection continuity in overlapping regions while preventing print quality deterioration at boundaries, thus applying different quality control strategies to different locations.