Liquid Ejection Head Electrical Fault Detection via Test Pattern Analysis
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Solution Overview
Problem
Existing liquid ejection head technologies do not effectively detect electrical faults, such as short circuits, based on pattern analysis, which is crucial for determining the need for head exchange and preventing continuous use of faulty elements.
Innovation Solution
A pattern formation device that forms an electrical fault detection pattern by ejecting liquid from a liquid ejection head with specifically arranged ejection elements, allowing for the acquisition and analysis of ejection data to determine fault conditions, including short circuits and driving voltage faults, through the formation of distinct dot sets and arrays on a medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical measurement methods (capacitance measurement, leakage current measurement) are used to detect short circuits between ejection elements, then detection capability is provided, but the method cannot detect electrical faults that occur after the liquid ejection head is mounted on the device
Solution Approach 1:
The patent performs electrical fault detection by forming test patterns on a medium before the liquid ejection head is permanently mounted or used for production. The ejection data acquisition unit captures ejection data of the test pattern, and the driving voltage supply unit supplies driving voltages to determine if electrical faults exist. This preliminary detection approach allows faults to be identified at an earlier stage, preventing faulty heads from being installed or used, thereby resolving the contradiction between providing detection capability and enabling timely detection.
2Reliability
If electrical measurement methods are applied to detect short circuits, then fault detection is enabled, but the complexity of the detection system increases
Solution Approach 1:
The liquid ejection head itself serves as the detection tool by forming test patterns on a medium. The ejection data acquisition unit acquires ejection data directly from the head's own ejection elements, and the driving voltage supply unit supplies voltages to the head's elements. This self-service approach eliminates the need for external specialized detection equipment, reducing system complexity while maintaining reliable fault detection capability.
Solution Approach 2:
The patent introduces a medium (such as a sheet or substrate) as an intermediary to receive the test pattern formed by the ejection elements. The ejection data acquisition unit captures data about the formed pattern, which indirectly reveals the electrical connection status of the ejection elements. This intermediary approach simplifies the detection system by using the medium as a passive carrier of detection information, avoiding complex direct electrical measurements.
3Productivity
If no electrical fault detection is performed, then the liquid ejection head can be continuously used, but faulty elements may operate undetected causing quality issues
Solution Approach 1:
The system performs electrical fault detection as a preliminary step before the liquid ejection head is mounted or used for production. The ejection data acquisition unit acquires ejection data of a test pattern, and the driving voltage supply unit supplies driving voltages to determine electrical fault conditions. By detecting faults beforehand, the system ensures that only functional heads are installed and used continuously, maintaining both productivity through uninterrupted operation of good heads and reliability through exclusion of faulty ones.
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 the detection of electrical faults in liquid ejection heads, allowing for the determination of necessary exchanges and preventing continuous use of faulty elements, thereby improving the reliability and efficiency of the ejection process.
Implementation Method 1
a pattern formation device that forms, in a medium, an electrical fault detection pattern by ejecting liquid from the liquid ejection head
Data Source
AI summary
A pattern formation device, a liquid ejection device, and an electrical fault detection method capable of detecting electrical fault of a liquid ejection head on the basis of an analysis result of an electrical fault detection pattern are provided. An electrical fault detection pattern having an arrangement of dot arrays satisfying an arrangement condition with an arrangement of a plurality of ejection elements in a liquid ejection head is formed by ejecting liquid from a liquid ejection head in which M rows of ejection element groups in which a plurality of ejection elements are arranged in a first direction are arranged in a second direction intersecting the first direction, and M is an integer equal to or greater than 2.