Inkjet Nozzle Detection Waveform for Early Abnormality Identification
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Solution Overview
Problem
Existing inkjet recording technologies face challenges in detecting and correcting ejection defects in inkjet heads, leading to image quality issues, reduced throughput, and increased paper waste due to the difficulty in maintaining the head during image formation and the need for expensive detection devices.
Innovation Solution
An inkjet recording apparatus with a detection waveform that includes ejection pulses of the same pulse width and interval as the recording waveform but with a weakened reverberation suppressing effect, allowing for early detection of ejection abnormalities by causing the meniscus to overflow, thereby reducing variation in detection performance caused by manufacturing variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a detection waveform with weakened reverberation suppressing effect is used to cause meniscus overflow for early detection, then detection sensitivity is improved, but recording stability may deteriorate
Solution Approach 1:
The system dynamically switches between two different drive waveforms: a recording waveform with strong reverberation suppressing effect for stable image recording, and a detection waveform with weakened reverberation suppressing effect for sensitive nozzle abnormality detection. This dynamic adaptation allows the system to optimize performance for the current operational mode without compromising either recording stability or detection sensitivity
Solution Approach 2:
The drive waveform is segmented into two distinct types with different characteristics. The recording waveform includes a reverberation suppressing section that stabilizes the meniscus for reliable image recording, while the detection waveform omits or weakens this section to allow meniscus overflow and improve detection sensitivity. This segmentation enables each waveform type to be optimized for its specific purpose
2Ease of operation
If maintenance is performed at a maintenance position outside the image formation region, then nozzle inspection can be carried out, but throughput declines due to head movement
Solution Approach 1:
The system performs preliminary detection of nozzle abnormalities by incorporating the abnormality detection function into the normal image formation process. By detecting nozzle issues early during recording operations rather than requiring separate maintenance positioning, the system eliminates the need to move the head to a maintenance position, thereby maintaining high throughput while enabling proactive nozzle inspection
Solution Approach 2:
The patent merges the image recording function and the nozzle abnormality detection function into a single integrated process. The same drive waveform and meniscus overflow conditions used for recording also serve as the basis for detection, eliminating the need for separate maintenance operations and head repositioning
3Measurement precision
If expensive high-resolution imaging devices or flight measurement devices are used for abnormality detection, then detection accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The inkjet head itself serves as the detection device by monitoring its own ejection characteristics. The system detects nozzle abnormalities by analyzing variations in droplet ejection behavior during normal recording operations, eliminating the need for external expensive detection equipment such as high-resolution imaging devices or flight measurement devices
Solution Approach 2:
The system implements feedback by continuously monitoring the ejection characteristics of each nozzle during recording operations. By detecting variations in droplet placement, size, or presence, the system provides real-time feedback on nozzle health and can identify abnormalities without requiring complex external measurement devices
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
Enables rapid detection of ejection abnormalities before visible image defects occur, maintaining recording stability and throughput while minimizing the impact of manufacturing variations in nozzle diameter and flow channel dimensions.
Implementation Method 1
a plurality of pressure generating elements corresponding to the nozzles are provided
Implementation Method 2
a reverberation suppressing section for suppressing reverberating vibration of a meniscus after ejection
Data Source
AI summary
According to the present invention, the occurrence of an ejection abnormality can be determined at an early stage by using a waveform for abnormal nozzle determination, before an image defect producing a visible density non-uniformity (stripe non-uniformity) occurs due to an ejection defect in an output image recorded by a drive signal having a recording waveform. Consequently, recording stability and throughput can both be achieved.