Duplex Recording Device Position Matching Correction
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Solution Overview
Problem
In duplex recording devices, such as ink jet printers, image deviation between the first and second surfaces of a medium can occur due to reading errors in marker intervals, leading to potential misalignment and positional deviations of the recorded images.
Innovation Solution
A recording device with a detection unit that forms a reference pattern on the first surface and a control unit that generates correspondence relationships between the reference pattern and raster data of both images, allowing for precise determination and correction of positional deviations between the images on the first and second surfaces during duplex recording.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple markers for detection are formed at predetermined intervals to detect medium expansion/contraction, then the expansion/contraction amount can be obtained, but reading errors in marker intervals cause cumulative errors from front end to rear end of the image
Solution Approach 1:
The patent divides the detection task into two independent parts: (1) detecting the position of a single reference marker, and (2) detecting the position of a single correction marker. By segmenting the multiple markers into pairs of reference and correction markers, the system avoids cumulative errors that would occur if all markers were processed sequentially. Each marker pair is evaluated independently to determine expansion/contraction in different regions.
Solution Approach 2:
The patent introduces correction markers as intermediary elements between the reference markers and the final image positioning. The correction markers serve as mediators that provide local expansion/contraction information, allowing the system to adjust image positioning based on local conditions rather than relying on cumulative measurements from multiple markers.
2Manufacturing precision
If the length of the image on the second surface is determined based on the expansion/contraction amount from marker intervals, then the recording complete positions can be matched, but reading errors cause deviation in the length of the entire image
Solution Approach 1:
The patent performs preliminary detection of expansion/contraction using reference markers and correction markers before final image positioning. By detecting the positions of these markers in advance and calculating expansion/contraction amounts, the system can pre-adjust the image data (through thinning or interpolating) to compensate for medium deformation, ensuring accurate final positioning without cumulative errors.
Solution Approach 2:
The system uses correction markers to provide feedback information about local expansion/contraction conditions. This feedback allows the control unit to adjust the image data processing (thinning or interpolating) based on actual measured conditions, creating a closed-loop system that corrects for medium deformation while maintaining image length accuracy.
Data Source
AI summary
In a printer configured to perform two-sided recording, a control unit generates a first correspondence relationship that associates a reference pattern with raster data of a first image in a medium transport direction, and a second correspondence relationship that associates the reference pattern with raster data of a second image in the medium transport direction, and, when the second image is recorded on a second surface, performs determination processing for determining whether the reference pattern detected by a detection unit and the raster data of the second image, which a recording unit records when the reference pattern is detected, match the second correspondence relationship.