Liquid Ejection Nozzle Detection Based on Non-Ejection Time
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Solution Overview
Problem
Existing liquid ejection apparatuses execute abnormality detection processing for nozzles regardless of the length of the non-ejection period, which can hinder image formation processing when the non-ejection period is too short.
Innovation Solution
A liquid ejection apparatus that acquires the length of the non-ejection period and restricts abnormality detection processing when it is less than a predetermined threshold, allowing for nozzle abnormality detection without interrupting image formation, and performs oscillation processing when the non-ejection period is relatively short.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If abnormality detection processing is executed during non-ejection period regardless of its length, then nozzle abnormality can be detected, but image formation processing is hindered when non-ejection period is too short
Solution Approach 1:
The patent dynamically adjusts the abnormality detection strategy based on the length of the non-ejection period. When the non-ejection period is sufficient, abnormality detection processing is executed to ensure nozzle reliability. When the non-ejection period is too short, the detection processing is omitted to avoid hindering image formation processing. This dynamic adaptation resolves the contradiction between maintaining detection reliability and ensuring processing productivity.
Solution Approach 2:
The patent changes the parameter of detection execution based on the non-ejection period length. By comparing the actual non-ejection period against a threshold value, the system decides whether to execute abnormality detection processing or not. This parameter-based decision-making allows the system to optimize between detection thoroughness and processing efficiency under different operating conditions.
2Reliability
If abnormality detection processing is executed during short non-ejection period, then detection coverage is improved, but processing time increases and interrupts image formation
Solution Approach 1:
The patent performs preliminary assessment of the non-ejection period length before deciding to execute abnormality detection processing. By evaluating whether the non-ejection period is sufficient in advance, the system avoids initiating detection processing that would exceed available time and interrupt image formation. This preliminary action ensures that detection is only performed when time permits, preventing time loss while maintaining detection coverage.
Solution Approach 2:
When the non-ejection period is determined to be too short, the patent skips the abnormality detection processing step entirely rather than attempting to complete it. This skipping approach prevents the detection process from extending into the image formation period, thereby avoiding time loss and interruptions while still maintaining overall system efficiency.
3Ease of operation
If oscillation processing is performed during short non-ejection period, then meniscus oscillation is achieved, but oscillation efficiency decreases
Solution Approach 1:
The patent adjusts oscillation processing parameters based on the non-ejection period length. When the non-ejection period is short, the system modifies the oscillation approach to accommodate the time constraint, even though this reduces oscillation efficiency. This parameter adaptation ensures that meniscus oscillation can still be achieved under tight time constraints while minimizing the negative impact on efficiency.
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 effective nozzle abnormality detection without hindering image formation processing and reduces meniscus oscillation inefficiencies, thereby maintaining image quality.
Implementation Method 1
a piezoelectric element configured to change a pressure in the pressure chamber in response to an input of a drive signal
Data Source
AI summary
A liquid ejection apparatus includes a nozzle, a pressure chamber, a piezoelectric element, an acquisition processing portion, and a restriction processing portion. The nozzle ejects a liquid. The pressure chamber communicates with the nozzle and contains the liquid. The piezoelectric element changes a pressure in the pressure chamber in response to an input of a drive signal. When image formation processing for ejecting the liquid from the nozzle is executed based on image data, the acquisition processing portion acquires a length of a non-ejection period in which the liquid is not ejected from the nozzle, the non-ejection period being included in an execution period of the image formation processing. When the length of the non-ejection period acquired by the acquisition processing portion is less than a predetermined first threshold value, the restriction processing portion restricts abnormality detection processing for detecting an abnormality of the nozzle using the piezoelectric element.