Amplitude Modulation Screening Using Hexagonal Screen Dots
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Solution Overview
Problem
Traditional amplitude modulation screening in printing faces issues with screen dot enlargement leading to printing losses and texture problems due to orthogonal arrangements, which affect output quality.
Innovation Solution
The use of regular hexagon screen dots to form a threshold matrix for amplitude modulation screening, reducing perimeter enlargement and preventing texture issues by non-orthogonal angle arrangements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional amplitude modulation screening uses screen dots with larger perimeters (non-circular shapes), then the screen dots can be arranged in orthogonal angles for printing, but the screen dots enlarge more during plate printing causing greater printing losses
Solution Approach 1:
The patent changes the geometric parameters of screen dots by transitioning from traditional circular or regular-shaped dots to irregular hexagonal dots with specific perimeter characteristics. This parameter change allows the screen dots to maintain suitable arrangement properties while reducing perimeter enlargement during printing, thereby resolving the contradiction between ease of arrangement and manufacturing precision.
2Adaptability or versatility
If screen dots are arranged in orthogonal angles (θ and 90+θ), then the four-color printing process can be implemented, but texture problems and net hitting occur under limited angle selection
Solution Approach 1:
The patent introduces asymmetric hexagonal screen dot shapes that break the traditional orthogonal angle arrangement symmetry. The hexagonal geometry with specific angle relationships (not limited to orthogonal angles) allows for more flexible arrangement that avoids the texture problems and net hitting associated with strict orthogonal arrangements, while still maintaining compatibility with four-color printing processes.
3Manufacturing precision
If circular screen dots are used, then the perimeter enlargement is minimized, but the screen dots cannot be arranged in diverse shapes needed for traditional amplitude modulation screening
Solution Approach 1:
The patent adopts hexagonal screen dots that combine curved boundary characteristics with angular geometry. The hexagonal shape provides curved-like continuity in its sides while maintaining distinct angular vertices, allowing for diverse arrangement patterns and shape variations needed for traditional amplitude modulation screening, while controlling perimeter enlargement better than traditional irregular shapes.
Data Source
AI summary
An amplitude modulation screening method is provided. The method comprises a step of utilizing regular hexagon screen dots to form a threshold matrix for amplitude screening. In embodiments of the present application, an amplitude modulation screening apparatus is also provided. The apparatus may comprise a matrix module configured to constitute a threshold matrix for amplitude screening using regular hexagon screen dots. Due to the threshold matrix formed with regular hexagon screen dots, the method and apparatus of the present application resolve the problem of the screen dots in the prior art, and improve the printing quality.