Liquid Ejection Head Abnormality Detection Under High Load
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Solution Overview
Problem
Existing liquid ejection head technologies struggle to detect ejection element abnormalities, particularly under high loaded conditions, as current test patterns fail to accurately represent the ejection state and detect unstable or deviating elements.
Innovation Solution
The method involves outputting a high load pattern followed by an ejection abnormality detection pattern within a specific time frame to simulate a high loaded condition, allowing for the identification of unstable ejection elements that may not be detected under low loaded conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a test pattern is output under low loaded condition, then the ejection abnormality detection can be performed, but the ejection elements in unstable state under high loaded condition cannot be detected
Solution Approach 1:
The patent changes the operation condition parameter from low loaded to high loaded condition by outputting a high load pattern before the test pattern. This causes the ejection elements to transition to an unstable state, enabling detection of abnormalities that would not manifest under normal operating conditions. The high load pattern increases the liquid ejection volume or frequency to simulate high loaded operation.
2Reliability
If the liquid ejection head is operated under high loaded condition, then more ejection elements become abnormal, but the conventional test pattern cannot detect these abnormalities
Solution Approach 1:
The patent applies preliminary action by outputting the high load pattern before the test pattern. This preliminary high loaded operation puts the ejection elements into an unstable state, ensuring that when the subsequent test pattern is output, any abnormal ejection elements are already in a detectable state. This sequence of operations enables detection without requiring complex test patterns.
Data Source
AI summary
A liquid is ejected which has a volume exceeding a volume for forming a dot of a maximum size used in regular liquid ejection to output a high load pattern, an ejection abnormality detection pattern is output for detecting an ejection element abnormality within a specific period of time from outputting the high load pattern, read data of the output ejection abnormality detection pattern is acquired, and the acquired read data is analyzed to detect an abnormal ejection element.