Ink Jet Recording Device Comb Teeth Density Correction
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Solution Overview
Problem
Ink jet recording devices with a medium supporting part having a comb teeth structure experience density unevenness due to temperature differences between the medium and the supports, leading to variations in ink droplet diameter and landing interference, and existing correction methods worsen the issue by not addressing non-uniform temperature distributions.
Innovation Solution
A density unevenness correction method that outputs a test chart with multiple grayscales, reads the image, and derives correction values for different regions supported by the comb teeth structure, allowing for specific data correction in each region to achieve uniform density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the medium supporting part is constituted by supports having a comb teeth structure, then the medium can be transported effectively, but density unevenness occurs due to temperature differences between the medium and supports
Solution Approach 1:
The patent divides the medium supporting part into multiple comb teeth structures with gaps between them. This segmentation allows the medium to be supported at multiple discrete points rather than continuously, reducing the contact area and minimizing temperature transfer from the supports to the medium, thereby reducing density unevenness while maintaining transportation functionality
Solution Approach 2:
The patent applies different properties to different regions of the medium supporting part. The comb teeth structures are designed with specific spacing and geometry to create localized support zones that minimize thermal contact. The gaps between comb teeth create regions of reduced thermal interaction, allowing different portions of the medium to experience different thermal conditions appropriate for their position
2Stability of the object's composition
If the medium contacts the supports in certain regions, then the medium is stabilized during transport, but temperature distribution becomes non-uniform causing density unevenness
Solution Approach 1:
The comb teeth structure segments the contact between medium and support, creating discrete contact points rather than continuous contact. This segmentation provides sufficient stability through multiple distributed contact points while minimizing the total contact area, thereby reducing thermal transfer and maintaining more uniform temperature distribution across the medium
Solution Approach 2:
The patent addresses the temperature distribution problem by considering the thermal interaction in a different dimensional context. The comb teeth structure creates a three-dimensional arrangement of contact points that distributes thermal effects across space, preventing concentrated heat transfer and promoting more uniform temperature distribution across the medium surface
3Manufacturing precision
If a general density unevenness correction method is applied, then correction can be performed, but the correction is ineffective or worsens the unevenness due to non-uniform temperature distribution
Solution Approach 1:
The patent applies different correction values to different regions of the medium based on their specific thermal conditions. The correction method divides the medium into multiple regions corresponding to different comb tooth support zones and applies locally-optimized correction parameters to each region, rather than using a single uniform correction approach, thereby improving correction effectiveness across the entire medium
Solution Approach 2:
The density unevenness correction method uses feedback from measured or calculated temperature distributions and density variations to adjust correction parameters. The system monitors the actual density outcomes and uses this information to refine the region-specific correction values, creating a closed-loop control system that continuously improves correction effectiveness
Data Source
AI summary
In an ink jet recording device in which a paper supporting part is constituted by a first support and a second support having a comb teeth structure, a region where paper is supported by only the first support is defined as a first region, a region where the paper is supported by only the second support is defined as a second region, and a region where the paper is supported by the first support and the second support is defined as a third region. Charts including a plurality of grayscales for the respective regions are drawn. The respective drawn charts are read by an image reader. Correction values of density unevenness are obtained for the respective regions on the basis of the reading results. Density data of an image are corrected for the respective regions on the basis of the correction values of the density unevenness for the respective regions.