Inkjet Print Head Density Unevenness Correction
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Solution Overview
Problem
Inkjet printers experience continuous line-like density unevenness in the intersecting direction due to variations in print head movement and stability, which existing correction methods fail to adequately address.
Innovation Solution
A printing device and method that includes a print head with nozzles mounted on a carriage reciprocating along a main scanning direction, using a control section to print a test pattern, acquire unevenness positions, and adjust the liquid ejection amount based on density unevenness, thereby correcting the ejection to suppress line-like density issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional raster line correction methods are used, then correction processing can be performed, but line-like density unevenness occurs continuously in the intersecting direction
Solution Approach 1:
The invention changes the parameter of correction application from uniform raster line-based correction to position-specific correction based on detected unevenness locations. By identifying specific unevenness positions and applying correction values selectively to those positions rather than uniformly across all raster lines, the system achieves effective suppression of line-like density unevenness while maintaining operational simplicity.
2Ease of operation
If correction values are applied to all raster lines, then processing can be performed systematically, but density unevenness at specific unevenness positions cannot be adequately suppressed
Solution Approach 1:
The invention applies local quality by transitioning from uniform correction across all raster lines to localized correction at specific unevenness positions. The control section detects positions where density unevenness occurs and applies correction values selectively to those specific locations, making the correction effectiveness depend on the local characteristics of each position rather than applying a uniform approach throughout.
3Device complexity
If no position-specific correction is performed, then the system operates simply, but continuous line-like density unevenness occurs in the intersecting direction
Solution Approach 1:
The invention implements feedback by having the control section detect density unevenness positions in the print output and use this detection information to determine correction values for subsequent printing. The system continuously monitors print quality, identifies problematic positions, and adjusts correction parameters accordingly, creating a closed-loop control system that suppresses line-like density unevenness without requiring overly complex predetermined correction mechanisms.
Data Source
AI summary
A printing device includes a print head including a plurality of nozzles configured to eject liquid onto a medium; a carriage on which the print head is mounted and which is configured to reciprocate along a predetermined main scanning direction; and a control section that controls ejection of liquid by the print head, wherein the control section prints a test pattern on the medium by main scanning, which is an ejection operation of liquid by the print head in accordance with movement of the carriage along the main scanning direction, acquires an unevenness position, which is a position in the main scanning direction where density unevenness in an intersecting direction, which intersects the main scanning direction, occurs in a print result of the test pattern, and corrects an ejecting amount of liquid for the unevenness position by the print head in accordance with the density unevenness.