Inkjet Printhead Resistor Monitoring for Nozzle Deterioration Detection
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Solution Overview
Problem
Existing printing technologies fail to accurately detect the deterioration of heating resistors in inkjet printing heads due to variations in resistance values caused by manufacturing processes and aging, leading to potential malfunction and defective ink ejection.
Innovation Solution
A printing apparatus and method that includes a determination unit to predict and measure resistance values of heating resistors, using a calculation formula to account for manufacturing dispersion and driving settings, and compare predicted and measured values to detect deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resistance value measurement is performed to detect heat resistor deterioration, then deterioration detection capability is improved, but measurement precision deteriorates due to manufacturing variations and aging effects
Solution Approach 1:
The patent applies preliminary action by measuring the resistance value of the heat resistor immediately after the ink ejection operation is completed, before the heat resistor cools down completely. This timing captures the resistance value when the heat resistor is still in its operational state, allowing comparison with the initial resistance value to detect deterioration. The control unit performs this measurement automatically as part of the operation cycle, ensuring consistent timing conditions for accurate deterioration detection.
2Device complexity
If simple resistance value measurement is used, then device complexity is reduced, but deterioration detection accuracy deteriorates due to manufacturing dispersion and aging effects
Solution Approach 1:
The patent implements feedback by continuously monitoring the resistance value of the heat resistor and comparing it with the initial resistance value stored in the control unit. When the resistance value changes beyond a predetermined threshold, the system provides feedback by notifying the user of heat resistor deterioration. This simple yet effective feedback mechanism enables accurate deterioration detection without requiring complex analysis systems, maintaining low device complexity while improving detection accuracy.
Solution Approach 2:
The control unit stores the initial resistance value measured when the ink ejection operation is first performed, serving as a baseline for future comparisons. This preliminary recording of the initial state allows the system to detect any subsequent changes in resistance value that indicate deterioration, improving detection accuracy without adding complex reference systems.
3Ease of operation
If resistance value measurement is performed at any timing, then ease of operation is improved, but measurement precision deteriorates due to temperature variations affecting resistance
Solution Approach 1:
The patent specifies that the resistance value measurement should be performed immediately after the ink ejection operation is completed, which is a predetermined timing condition. This preliminary measurement at a consistent post-operation timing ensures that the heat resistor is in a comparable state each time, reducing temperature-related variations and improving measurement precision while maintaining ease of operation through automated timing.
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
Accurately detects heating resistor deterioration, preventing malfunction and ensuring consistent ink ejection performance by identifying defective nozzles before they fail.
Implementation Method 1
a heating resistor provided so that the heating resistor corresponds to each nozzle and film-boiling the ink near the heating resistor
Data Source
AI summary
A technique by which deterioration of a heat resistor can be detected more accurately is provided. There are included a printing head configured to eject an ink from a nozzle provided so that the nozzle corresponds to a heat resistor and perform printing by applying a pulse voltage to the heat resistor; an obtaining unit configured to obtain a prediction resistance value of the heat resistor according to a unique value of the heat resistor and a setting value to drive the heat resistor; a measurement unit configured to measure the resistance value of the heat resistor; and a determination unit configured to determine based on the prediction resistance value and the resistance value whether deterioration arises in the heat resistor.