Inkjet Density Correction Using Primer and Ink Ejection Tables
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Solution Overview
Problem
Inkjet printing devices face challenges in maintaining print quality due to variations in ink ejection amounts among nozzles and inadequate adhesion of ink to different base materials, leading to density unevenness, especially when using non-permeable coated papers, and existing methods fail to adequately adjust density for each nozzle.
Innovation Solution
A density adjustment method involving the creation of color ink and processing liquid correction value tables to account for variations in ejection amounts, allowing for precise control of ink and processing liquid application on various base materials, ensuring uniform print quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If processing liquid is applied to the base material before printing, then adhesion between ink and base material is improved, but density unevenness occurs due to variation in processing liquid ejection amount among nozzles
Solution Approach 1:
The patent applies different processing liquid ejection amounts to different regions (first region and second region) based on their specific requirements. By creating region-specific shading correction values, the system optimizes adhesion locally in each region while maintaining overall density uniformity across the entire print area.
Solution Approach 2:
The patent changes the ejection amount parameters of the processing liquid for different nozzles and regions. By adjusting the processing liquid density signal values and creating region-specific shading correction values, the system compensates for nozzle variations and achieves both good adhesion and uniform density.
2Manufacturing precision
If shading correction processing is performed for color ink nozzles, then density uniformity is improved, but print quality degrades when appropriate processing liquid amount is not applied
Solution Approach 1:
The patent performs preliminary action by applying the processing liquid to the base material before printing the color ink. This preliminary application of processing liquid with region-specific shading correction ensures that the base material is properly prepared for ink adhesion, preventing print quality degradation that would occur if only color ink shading correction were performed.
Solution Approach 2:
The processing liquid acts as an intermediary between the base material and the color ink. By applying this intermediary layer with optimized region-specific shading correction, the system ensures both uniform density and reliable print quality, as the processing liquid mediates the interaction between the base material and ink.
3Strength
If processing liquid ejection amount is varied by region, then adhesion is optimized for different base material regions, but device complexity increases due to multiple correction value tables
Solution Approach 1:
The patent segments the print area into multiple regions (first region and second region) with different processing liquid ejection characteristics. By creating separate shading correction value tables for each region, the system optimizes adhesion for each segment while managing complexity through systematic organization of the correction data.
Data Source
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AI summary
A color ink density correction value table representing a correspondence relationship between color ink density signal values and densities to be appeared by ejecting color ink on a base material is created (S100). A plurality of primer density correction value tables each representing a correspondence relationship between primer density signal values and densities to be appeared by ejecting the color ink on the primer is created (S110). A color ink density correction value is obtained based on the density of a first color image formed only with the color ink with reference to the color ink density correction value table (S140). A primer density correction value is obtained based on the density of a second color image formed with the primer and the color ink with reference to the primer density correction value table corresponding to the density of the color ink (S180).