Printhead Ejection Port Allocation for Balanced Inkjet Wear
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Solution Overview
Problem
The selective use of ejection port groups in existing printing technologies leads to unequal usage frequencies, resulting in faster wear and reduced lifespan of printheads due to uneven distribution of ink ejection, particularly when printing on colored and transparent media.
Innovation Solution
A printing apparatus with a conveyance unit and a control unit that manages ejection port arrays to print a foundation layer and color image without overlap, using distinct ejection port groups for stack and non-stack regions, ensuring balanced usage of ejection ports across arrays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If selective use of ejection port groups is implemented to prevent overlap between foundation layer and color image, then printing quality is improved, but ejection port usage becomes uneven leading to reduced printhead lifespan
Solution Approach 1:
The patent applies local quality by differentiating ejection port usage based on the printing region. Different ejection port groups are assigned to different regions (first region, second region, third region) of the printing medium. This allows the system to maintain high printing quality through region-specific optimization while distributing wear across all ejection ports by varying which ports are active in which regions, thereby preventing any single group from being overused.
2Manufacturing precision
If ejection port groups are assigned to prevent overlap in stack region printing, then color reproduction is improved, but usage inequality among ejection ports increases
Solution Approach 1:
The patent segments the ejection ports into multiple distinct groups (first ejection port group, second ejection port group, third ejection port group) that are assigned to different printing regions. This segmentation allows the system to maintain precise color reproduction by dedicating specific port groups to specific regions while ensuring that all port groups are utilized across different regions, thereby distributing wear and improving overall reliability.
3Manufacturing precision
If distinct ejection port groups are used for foundation layer and color image, then mixing between layers is reduced, but ejection port usage becomes unbalanced
Solution Approach 1:
The patent introduces a spatial dimension to ejection port assignment by dividing the printing medium into multiple regions (first, second, and third regions) and assigning different ejection port groups to each region. This dimensional approach allows the system to achieve excellent layer separation by preventing overlap in the stack region while simultaneously distributing usage across all ejection ports by utilizing different port groups in different regions, thereby extending their service life.
Data Source
AI summary
A printing apparatus includes a printing-medium conveyance unit, a printhead, and a control unit. The printhead has a first array of ejection ports ejecting a first ink and a second array of ejection ports ejecting a second ink, with the ports arranged in a printing-medium conveyance direction and the arrays arranged in a predetermined direction intersecting the conveyance direction. The control unit performs control to print an image of a foundation layer and images in stack and non-stack regions on the printing medium by having the conveyance unit convey the printing medium while scanning the printhead. The control unit performs control so that in printing in the non-stack region, the image of the foundation layer is printed using an ejection-port group in the first array at the same position as an ejection-port group in the second array for printing the image in the non-stack region, in an ejection-port arrangement direction.