Inkjet Dot Arrangement for Reaction Solution Beading Control
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Solution Overview
Problem
Inkjet recording apparatuses face issues with image defects such as bleeding and beading on low-permeability recording media due to the interaction of colorant ink droplets and reaction solution droplets, leading to density unevenness and texture problems.
Innovation Solution
A recording apparatus with separate nozzle rows for colorant ink and reaction solution, along with processors that determine ink and reaction solution amounts and dot arrangements based on input image data, using dither patterns to enhance dot overlap at lower gradation levels, thereby reducing beading and image defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If reaction solution is applied more than necessary to reduce bleed, then bleed between colorant ink droplets is reduced, but the boundaries between adjacent dots of reaction solution droplets merge causing beading
Solution Approach 1:
The patent applies different dot arrangement strategies to different regions of the image based on local characteristics. Specifically, it controls the dot arrangement of reaction solution differently in highlight regions (low gradation values) versus other regions, allowing closer dot spacing in highlights where bleed is less problematic while maintaining larger spacing elsewhere to prevent beading.
Solution Approach 2:
The patent changes the dot arrangement parameters of reaction solution based on the gradation values of the image. By adjusting dot size, spacing, and distribution patterns according to local gradation levels, it optimizes the balance between preventing bleed in dark regions and avoiding beading in lighter regions.
2Object-generated harmful factors
If dot arrangement of reaction solution is optimized to prevent beading, then beading is reduced, but density unevenness and textures may occur due to variations in dot arrangements
Solution Approach 1:
The patent performs preliminary dot arrangement planning for reaction solution based on predicted colorant ink dot positions before actual recording. By pre-determining optimal reaction solution dot locations and sizes that will contact colorant ink dots, it ensures both uniform density and prevention of beading.
Solution Approach 2:
The patent uses feedback from colorant ink dot arrangement information to adjust reaction solution dot arrangement. The dot arrangement of reaction solution is determined based on the amounts and positions of colorant inks, creating a coordinated system that prevents both beading and density unevenness.
3Manufacturing precision
If separate nozzle rows are used for colorant ink and reaction solution, then application precision is improved, but device complexity increases
Solution Approach 1:
The patent divides the nozzle system into separate nozzle rows for colorant ink and reaction solution. This segmentation allows independent control and optimization of each fluid's application, improving precision while the shared carriage structure manages overall system complexity.
Solution Approach 2:
The patent designs the recording head with multiple nozzle rows that share common carriage and control structures. While the nozzles are specialized for different fluids (colorant ink versus reaction solution), the supporting infrastructure serves universal functions, balancing specialization with system simplicity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively suppresses image defects like density unevenness and textures by optimizing the dot arrangements of reaction solution and colorant ink, ensuring better contact probability and reduced beading on low-permeability recording media.
Implementation Method 1
the colorant inks and reaction solution are brought into contact on the recording medium, whereby coagulation and the like of the colorants contained in the colorant inks are caused to reduce bleed
Data Source
AI summary
A recording apparatus includes one or more processors that operate to determine a dot arrangement of a plurality of colorant ink on a recording medium and a dot arrangement of a reaction solution on the recording medium based on respective dither patterns, a first dither pattern for determining a dot arrangement of a first colorant ink and a second dither pattern for determining a dot arrangement for the reaction solution, wherein a first number, which is a number of pixels overlapping between a first dot arrangement with gradation values smaller than a first median of first dither pattern gradations and a second dot arrangement with gradation values smaller than a second median of second dither pattern gradations, is greater than a second number, which is a number of pixels overlapping between a dot arrangement with gradation values greater than the first median and the second dot arrangement.