Liquid Discharge Apparatus Movement Error Correction
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Solution Overview
Problem
Existing liquid discharge apparatuses face challenges in accurately determining discharge timing and image capturing timing due to movement errors of the recording medium, such as expansion, contraction, and slippage, which can lead to image quality deterioration and incomplete image capturing.
Innovation Solution
The apparatus includes a first detection unit to detect the movement amount of the recording medium, a first liquid discharge unit to discharge liquid downstream, a first image capturing unit to capture images between the detection and discharge units, and a second image capturing unit to capture images between the discharge and first image capturing units, with determining units to correct discharge and image capturing timings based on both movement amounts, using data from the second movement amount detected closer to the second image capturing unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single image capturing unit is used to capture the recording medium, then the device complexity is reduced, but the measurement precision of movement amount deteriorates
Solution Approach 1:
The patent divides the image capturing function into multiple segments (first image capturing unit and second image capturing unit) positioned at different locations. Each unit captures images independently, and their results are combined to achieve more accurate movement amount measurement than a single unit could provide.
2Measurement precision
If image capturing range is reduced to focus on specific area, then the measurement precision of discharge timing is improved, but the area of recording medium captured deteriorates
Solution Approach 1:
The patent introduces an intermediary calculation process that uses movement amounts from multiple image capturing units to determine discharge timing. This intermediary step allows the system to maintain a focused capturing range while achieving high timing accuracy through computational synthesis of multiple measurements.
Data Source
AI summary
A liquid discharge apparatus includes a first detection unit to detect a first movement amount of a recording medium. The apparatus includes a first liquid discharge unit, a first image capturing unit to capture a first image of the medium in a capturing range between the first detection unit and the first liquid discharge unit, a second image capturing unit to capture a second image of the medium in the capturing range between the first discharge unit and the first capturing unit, a second detection unit to detect a second movement amount of the medium based on the first and second images, a first determining unit to determine a discharge timing of the first discharge unit based on the first and second movement amounts, and a second determining unit to determine a capturing timing of the second capturing unit based on the first and second movement amounts.