Driving Circuit Abnormality Detection Control for Liquid Discharge Apparatus
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Solution Overview
Problem
Existing liquid discharge apparatuses, such as ink jet printers, face issues with accurately determining the operating state of the driving circuit, leading to potential errors in ink discharge and print quality due to indeterminate internal states of the integrated circuit.
Innovation Solution
A driving circuit is designed with an integrated circuit that includes an amplification control signal generation circuit, registers for holding operating and abnormality detection data, and a detection circuit to generate an abnormality signal, which controls the output of the signal to prevent erroneous detection and maintain accurate operating states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the integrated circuit is used to control the driving circuit operating states, then the control functionality is improved, but the internal state becomes indeterminate leading to erroneous detection
Solution Approach 1:
The patent applies preliminary action by initializing the internal state of the integrated circuit to a determined state immediately after power is supplied. This prevents the indeterminate state from causing erroneous detection of operating states. The initialization is performed before the driving circuit starts normal operation, ensuring reliable state detection from the beginning.
2Adaptability or versatility
If the driving circuit operates in multiple states (driving, standby, sleep), then the adaptability is improved, but the state determination accuracy deteriorates due to indeterminate internal state
Solution Approach 1:
The patent applies preliminary action by initializing the internal state of the integrated circuit to a determined state immediately after power is supplied. This prevents the indeterminate state from causing erroneous detection of operating states. The initialization is performed before the driving circuit starts normal operation, ensuring reliable state detection from the beginning.
Solution Approach 2:
The patent uses feedback by monitoring the relationship between the internal state of the integrated circuit and the operating state of the driving circuit. When a mismatch or abnormality is detected (indicating erroneous detection), the system can take corrective action such as re-initializing the internal state, ensuring continued accurate state detection across multiple operating states.
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
The solution ensures reliable operation by preventing erroneous detection of abnormal states, reducing the risk of ink discharge inaccuracies and improving print quality by accurately managing the driving circuit's operating states.
Implementation Method 1
The piezoelectric element is provided in a print head corresponding to a plurality of nozzles for discharging the ink and a cavity for storing the ink discharged from the nozzles. Then, when the piezoelectric element is displaced in accordance with a driving signal, a diaphragm provided between the piezoelectric element and the cavity is bent, and a volume of the cavity is changed.
Data Source
AI summary
There is provided a driving circuit including: an integrated circuit, in which the integrated circuit includes an amplification control signal generation circuit that generates an amplification control signal, a first register that holds an operating state data indicating an operating state of the driving circuit, a second register that holds an abnormality detection data for determining the presence or absence of an abnormality in the operating state data, an abnormality detection circuit that determines whether or not the operating state data is abnormal based on the abnormality detection data, and generates an abnormality detection signal indicating the determination result; and an abnormality detection signal output control circuit that controls whether or not the abnormality detection signal is output, in which the abnormality detection signal output control circuit does not output the abnormality detection signal in a first mode to be shifted after power is turned on.