Water-Based Ink Set Hue Angle Segmentation
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Solution Overview
Problem
Existing ink-jet recording technologies face challenges in achieving desired chromaticity and saturation, particularly when using additional inks like light yellow, light magenta, or light cyan, or inks such as blue, violet, red, orange, and green, which often result in suboptimal image reproducibility and color reproducibility over a wide range.
Innovation Solution
A water-based ink set comprising a combination of inks with specific hue angles, such as greenish yellow and reddish yellow for yellow inks, reddish magenta and violetish magenta for magenta inks, and bluish cyan and greenish cyan for cyan inks, which develop excellent intermediate colors and enhance image and color reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional inks (light yellow, light magenta, light cyan or blue, violet, red, orange, green) are added to the conventional four color inks, then the number of inks in the ink set is increased to form five to seven inks, but the desired chromaticity and saturation are not obtained and color reproducibility over a wide range is not achieved
Solution Approach 1:
The patent segments the traditional single yellow, magenta, and cyan inks into multiple inks with different hue angles. For example, yellow is divided into greenish yellow (hue angle 95°-110°) and reddish yellow (hue angle 70°-85°), magenta is divided into reddish magenta (hue angle 0°-10°) and violetish magenta (hue angle 340°-350°), and cyan is divided into bluish cyan (hue angle 250°-260°) and greenish cyan (hue angle 230°-240°). This segmentation allows each ink to contribute specific color characteristics, achieving wide color gamut while maintaining chromaticity and saturation.
Solution Approach 2:
The patent applies local quality by assigning specific hue angle ranges to different inks within the set. Each ink has a defined hue angle range that targets specific regions of the color spectrum. This localized approach to color distribution ensures that when inks are combined, they produce accurate intermediate colors with proper chromaticity and saturation, rather than diluting the overall color quality.
2Adaptability or versatility
If inks with different hue angles are used to expand color range, then intermediate colors can be developed, but the chromaticity and saturation of the resulting image are insufficient
Solution Approach 1:
The patent changes the hue angle parameter of the inks to optimize color reproduction. By carefully selecting hue angles within specific ranges (e.g., greenish yellow at 95°-110°, reddish yellow at 70°-85°), the patent ensures that when these inks are combined, they produce intermediate colors with maintained chromaticity and saturation. The hue angle parameter is the key variable being optimized to resolve the contradiction between color range expansion and color quality.
Data Source
AI summary
A water-based ink set for ink-jet recording includes at least a yellow ink, a magenta ink and a cyan ink. At least one color ink of the yellow, magenta and cyan inks includes a first ink and a second ink which have different hue angles h having therebetween the color range of the normal color of the color ink. Preferably, the yellow ink includes a greenish yellow ink having a hue angle h of about 95° to about 110° and a reddish yellow ink having a hue angle h of about 70° to about 85°; the magenta ink includes a reddish magenta ink having a hue angle h of about 0° to about 10° and a violetish magenta ink having a hue angle h of about 340° to about 350°; and the cyan ink includes a bluish cyan ink having a hue angle h of about 250° to about 260° and a greenish cyan ink having a hue angle h of about 230° to about 240°.