Bidirectional Printing Halftone Control for Dot Position Misalignment
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Solution Overview
Problem
Bidirectional printing technologies face challenges in maintaining high image quality due to precision requirements for adjusting dot formation positions during forward and backward scans, leading to complex mechanisms and potential image degradation from physical differences such as dot position shifts and timing displacements.
Innovation Solution
A printing apparatus that employs a halftone process with a dither matrix having blue or green noise characteristics to classify pixel positions into groups, allowing for robust dot formation adjustments and minimizing image quality degradation by dispersing dots effectively across the print medium, even with physical differences in dot formation positions and timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If bidirectional printing is implemented to increase productivity, then printing speed is improved, but manufacturing precision requirements become stricter and device complexity increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the timing of dot formation based on the scan direction (forward or backward). The control unit modifies the timing parameter according to the movement direction of the dot forming head, allowing dots to be formed at appropriate positions during both forward and backward scans without requiring high-precision mechanical adjustment mechanisms.
2Productivity
If bidirectional printing is implemented to increase productivity, then printing speed is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical adjustment mechanisms with a control-based timing adjustment system. Instead of using exclusive adjustment mechanisms or complex programs to synchronize dot formation positions, the invention uses the control unit to adjust timing parameters based on scan direction, thereby simplifying the overall device structure while maintaining bidirectional printing capability.
Solution Approach 2:
The system performs self-adjustment by automatically modifying dot formation timing based on the detected scan direction. The control unit inherently adapts the timing parameters without requiring external adjustment mechanisms or complex programming, allowing the system to self-correct positioning issues during bidirectional operation.
3Manufacturing precision
If high precision adjustment mechanisms are used to maintain dot formation position accuracy, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces mechanical precision adjustment mechanisms with a control-based timing adjustment system. The control unit adjusts the timing of dot formation based on scan direction, eliminating the need for complex mechanical synchronization mechanisms while maintaining accurate dot formation positions during bidirectional printing.
Data Source
AI summary
This invention provides a printing apparatus that performs printing on a print medium. The printing apparatus includes: a dot data generator that performs a halftone process on image data, wherein the print image is formed by mutually combining print pixels belonging to each of a plurality of pixel position groups for which a physical difference is assumed at a formation of dots by the print image generator, in a common print area, and the halftone process is configured to determine the status of dot formation on each of the print pixels on an assumption of the physical difference.