Flexo Printing Plate Halftone Dot Height Variation

The patent applies local quality by creating a transition zone with gradually varying dot heights at the boundary between image and non-image portions. Specifically, dots in the highlight halftone dot portion have different heights depending on their position, with dots closer to the non-image portion having smaller heights. This localized variation in dot height prevents abrupt transitions and eliminates tone jump while preserving the flexibility of the relief forming layer for adapting to different printing targets.

The patent applies dynamics by making the dot height a variable parameter that changes dynamically based on position within the halftone dot portion. In the highlight area with low dot area ratio, dots near the non-image boundary are made shorter than dots in the center, creating a dynamic height profile. This dynamic adjustment of dot height compensates for the reduced dot area ratio and prevents density discontinuity at boundaries while maintaining smooth gradation.

The patent applies parameter changes by modifying the dot height parameter in the highlight halftone dot portion based on spatial position. Instead of using uniform dot height throughout, the invention varies dot height as a function of position, with dots closer to the non-image boundary having smaller heights. This parameter variation prevents tone jump and maintains density continuity while remaining manufacturable through conventional flexo printing processes.