Line Head Inter-Nozzle Distance Variation for Ink Penetration
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Solution Overview
Problem
Existing ink jet recording methods using a line head suffer from color differences when viewed in the width direction due to variations in inter-nozzle distances, leading to uneven ink penetration and concentration issues.
Innovation Solution
The method involves using a line head with a length equal to or longer than the recording width, featuring unit heads aligned in the recording width direction with varying inter-nozzle distances in the scanning direction. The inks used contain color materials and inorganic oxide particles, with compositions differing between the first and second inks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a line head with uniform inter-nozzle distances is used, then manufacturing precision is improved, but device complexity increases due to stricter manufacturing requirements
Solution Approach 1:
The patent applies local quality by making inter-nozzle distances different in different regions of the line head. Specifically, the first inter-nozzle distance in the scanning direction is set to be different from the second inter-nozzle distance, allowing each region to be optimized for its specific recording function while simplifying overall manufacturing requirements.
2Productivity
If ink penetration rate is increased to improve recording speed, then productivity is improved, but color uniformity deteriorates due to concentration unevenness
Solution Approach 1:
The patent changes the physical parameter of inter-nozzle distance to control ink penetration behavior. By setting different inter-nozzle distances in different regions, the ink flow rate and penetration rate are regulated to achieve uniform color distribution across the recording medium, allowing high-speed recording without sacrificing color uniformity.
Data Source
AI summary
A recording method comprises a discharging step of discharging a first ink and a second ink from a line head having a length equal to or longer than a recording width of a recording medium and allowing the inks to adhere to the recording medium, wherein the line head includes a plurality of unit heads aligned in the recording width direction of the recording medium and includes portions having different inter-nozzle distances in the scanning direction of a first nozzle that discharges the first ink and a second nozzle that discharges the second ink, and the first ink and the second ink contain color materials and inorganic oxide particles, and the color materials have compositions different from each other.