Adaptive Ejection Speed Measurement for Ink Droplet Alignment
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Solution Overview
Problem
Inkjet printing apparatuses face challenges in maintaining consistent ejection speeds of ink droplets due to individual differences in printing equipment and environmental factors, leading to misalignment of ink droplet landing positions and deteriorated image quality.
Innovation Solution
An ejection apparatus with a droplet detection unit to measure ejection speeds and a determination unit to adjust subsequent measurement timings, ensuring accurate ejection timing adjustments based on detected speeds, thereby maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ejection speed measurement is performed frequently to maintain image quality, then measurement precision is improved, but user convenience deteriorates due to frequent measurements
Solution Approach 1:
The patent applies dynamics by making the measurement interval adaptive rather than fixed. The determination unit dynamically adjusts the timing of subsequent ejection speed measurements based on the actual ejection speed acquired at preceding timings. When ejection speed changes significantly, measurements are triggered more frequently; when ejection speed remains stable, measurements are spaced out, thus balancing measurement precision with user convenience.
2Ease of operation
If ejection speed measurement interval is extended to improve user convenience, then ease of operation is improved, but image quality deteriorates due to misalignment of ink droplet landing positions
Solution Approach 1:
The patent implements feedback by using the ejection speed acquisition results from preceding timings to determine subsequent measurement timings. The determination unit continuously monitors ejection speed and uses this feedback information to decide when the next measurement should occur, ensuring that measurements are performed at appropriate intervals to maintain landing position accuracy while avoiding excessive measurements that would reduce user convenience.
3Manufacturing precision
If ejection speed measurement is performed frequently to maintain landing position alignment, then manufacturing precision is improved, but loss of time increases due to frequent measurements
Solution Approach 1:
The patent applies dynamics by implementing variable measurement intervals based on actual ejection speed conditions. Instead of performing measurements at fixed frequent intervals, the system dynamically determines when measurements are necessary based on preceding measurement results, thereby reducing unnecessary measurements and minimizing time loss while still maintaining landing position alignment when needed.
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 solution effectively adjusts ejection timings to maintain consistent ink droplet landing positions, enhancing image quality by addressing variations in ejection speeds caused by equipment and environmental factors.
Implementation Method 1
a droplet detection unit configured to detect arrival of the droplet ejected from the ejection port at a predetermined position
Data Source
AI summary
An ejection apparatus includes an ejection head configured to eject a droplet from an ejection port on an ejection port surface, a droplet detection unit configured to detect arrival of the droplet ejected from the ejection port at a predetermined position, an acquisition unit configured to acquire information about an ejection speed that is a moving speed of the droplet detected by the droplet detection unit, and a determination unit configured to determine subsequent timings for acquiring an ejection speed by the acquisition unit, based on the ejection speed acquired by the acquisition unit at a preceding timing of the subsequent timings.