Recording Apparatus Nozzle Position Correction via Adjacent Patterns
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Solution Overview
Problem
Existing recording apparatuses face challenges in accurately obtaining density correction values and nozzle position information due to skew during scanning, especially when using sheet-feed type scanners, which affects the correction of density unevenness in recorded patterns.
Innovation Solution
A recording and reading system that records multiple density correction patterns with adjacent position identification patterns in an intersecting direction, allowing for accurate identification of nozzle positions even if skew occurs during reading, by using a control section to control the recording head to record patterns such that each density correction pattern is adjacent to a position identification pattern on at least one end side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a test pattern is recorded and read using a sheet-feed type scanner, then density correction values can be acquired, but skew during scanning causes inaccurate reading values and makes it difficult to accurately obtain density correction values corresponding to nozzle positions
Solution Approach 1:
Position identification patterns are introduced as intermediary elements between the test pattern and the scanning process. These patterns serve as reference markers that enable accurate position identification even when skew occurs during scanning, acting as a mediator that decouples the positioning function from the density measurement function
Solution Approach 2:
The pattern is segmented into distinct functional components: position identification patterns for establishing reference positions and test patterns for density measurement. This segmentation allows the position identification function to be independently optimized and used to correct skew effects before density measurements are performed
2Loss of information
If ruled lines are used to identify nozzle positions, then position information can be obtained, but skew during reading makes it difficult to accurately associate ruled line positions with corresponding nozzle positions
Solution Approach 1:
Position identification patterns serve as intermediary reference markers that facilitate accurate association between physical nozzle positions and their corresponding read values. These patterns provide a stable reference framework that remains valid even when skew occurs during scanning
Solution Approach 2:
The system uses the position identification patterns to provide feedback on the actual positions recorded on the medium. This feedback information is used to correct any deviations caused by skew and to accurately map read values back to their corresponding nozzle positions
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
Enables accurate acquisition of read values corresponding to each nozzle position, effectively correcting density variations and maintaining image quality despite potential skew during reading.
Implementation Method 1
recording head having nozzles that eject liquid onto a medium
Implementation Method 2
reading section that reads the pattern recorded on the medium
Data Source
AI summary
A recording apparatus includes a recording head that has a plurality of nozzles that eject liquid onto a medium and a control section that controls an ejection of liquid by the recording head, wherein the control section controls the recording head to record a plurality of first patterns having mutually different densities on the medium in a intersecting direction that intersects a nozzle alignment direction in which the nozzles are arranged, and to record a plurality of second patterns for identifying positions of the nozzles in the nozzle alignment direction on the medium in the intersecting direction such that each of the plurality of first patterns is adjacent to the second patterns on at least one of one end side and the other end side in the intersecting direction.