Ink Jet Recorder Registration Mark Segmentation for Distortion Correction
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Solution Overview
Problem
Conventional inkjet recorder technologies face challenges in accurately forming an ink layer for overcoating on distorted printed images, as they cannot detect distortion and may misalign the ink layer, leading to incorrect corrections.
Innovation Solution
An inkjet recorder system that includes a conveying mechanism, a recording head, an ultraviolet-ray irradiation unit, a reader, a memory unit, and a correction unit, which uses registration marks printed on the paper to accurately correct the discharge data for the overcoating ink, ensuring precise alignment and correction even with distorted images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional registration mark techniques are used for overcoating, then the ink discharge timing can be corrected for skewing, but distortion in the printed image cannot be detected leading to misalignment
Solution Approach 1:
The system divides the registration mark into multiple segments (multiple marks arranged in the paper-width direction) and reads their positional relationships separately. This segmentation allows the system to detect both skewing (overall displacement) and distortion (non-uniform displacement across different segments), enabling precise correction of discharge data for each detected error type.
Solution Approach 2:
The system implements a feedback mechanism where the reader detects the actual positions of registration marks, the controller calculates the differences between actual and design positions, and then corrects the discharge data based on these calculations. This closed-loop feedback enables the system to automatically compensate for both skewing and distortion, achieving high alignment accuracy.
2Manufacturing precision
If ink discharge timing is corrected based on registration marks, then misalignment can be compensated, but distortion may be erroneously determined as skewing causing incorrect correction
Solution Approach 1:
By segmenting the registration marks into multiple positions across the paper-width direction, the system can compare positional relationships at different locations. This enables differentiation between uniform skewing (all marks displaced equally) and non-uniform distortion (marks displaced differently), preventing erroneous correction.
Solution Approach 2:
The system performs multiple readings of registration marks at different positions and times, gathering more data than the minimum single reading. This excessive action of reading multiple marks provides sufficient information to distinguish between skewing and distortion, enabling accurate identification and correction of the specific type of misalignment present.
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
The system enables high-accuracy formation of the ink layer for overcoating by correcting discharge data based on the actual positional relationship of registration marks, effectively addressing distortion and misalignment issues, resulting in improved precision and efficiency in spot UV printing.
Implementation Method 1
an ultraviolet-ray irradiation unit that is arranged downstream of the recording head in a paper-conveying direction and that cures, by irradiating with an ultraviolet ray, the overcoating ink on the sheet of paper
Data Source
AI summary
On a sheet of paper on which an image has already been formed, a first registration mark pair and a second registration mark pair are printed. The first registration mark pair and second registration mark pair each consist of a pair of registration marks that are arranged to be spaced apart in a paper-width direction, the second registration mark pair located posterior to the first registration mark pair in the paper-conveying direction. Based on the actual positional relationship between the first registration mark pair and the second registration mark pair that are read by a reading unit, a correction unit corrects discharge data that corresponds to an image formation area located between the first registration mark pair and the second registration mark pair.