Residual Vibration Detection Circuit for Fast Ejection State Sensing
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Solution Overview
Problem
Existing methods for determining the ejection state in liquid ejecting apparatuses, such as inkjet printers, are insufficient in detection speed and accuracy of residual vibrations after pressure changes in pressure chambers.
Innovation Solution
A method involving a pre-charging step to store charge in a capacitive component of a residual vibration detection circuit, followed by a time counting step to determine the charging time, and a determination driving step to acquire and analyze residual vibration signals for ejection state determination, with repeated execution of these steps to improve detection accuracy and speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a capacitive component is charged before detecting residual vibration, then detection accuracy is improved, but detection speed deteriorates due to additional charging time
Solution Approach 1:
The capacitive component is pre-charged before residual vibration detection to ensure sufficient charge storage for accurate measurement. The charging time is dynamically adjusted based on elapsed time from the previous pre-charging step, optimizing the balance between charge sufficiency and detection speed.
Solution Approach 2:
The charging time of the capacitive component is made variable rather than fixed. The determination circuit dynamically adjusts charging time based on the elapsed time since the previous pre-charging step, allowing the system to adapt to different operating conditions and optimize both accuracy and speed.
2Measurement precision
If the pre-charging step is executed frequently, then detection accuracy is maintained, but processing time increases
Solution Approach 1:
The pre-charging step is executed periodically rather than continuously. The determination circuit controls the timing of pre-charging operations based on elapsed time from previous executions, creating an optimized periodic cycle that maintains detection accuracy while minimizing processing time overhead.
Solution Approach 2:
The system performs pre-charging only when necessary, based on timing conditions determined by the elapsed time from the previous pre-charging step. This selective preliminary action ensures the capacitive component is charged sufficiently before detection while avoiding unnecessary charging operations that would waste time.
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
Enhances the detection speed and accuracy of ejection states in liquid ejecting apparatuses by repeatedly executing pre-charging and determination steps, ensuring precise identification of ejection abnormalities.
Implementation Method 1
a pre-charging step of storing a charge in a capacitive component of the residual vibration detection circuit
Data Source
AI summary
An ejection state determination method includes a time counting step of acquiring an elapsed time from a time when the previous pre-charging step is executed, a charging time determination step of determining a charging time for storing a charge in a capacitive component of a residual vibration detection circuit according to the elapsed time, a charging step of storing the charge in the capacitive component of the residual vibration detection circuit according to the charging time, a determination driving step of supplying a drive waveform signal as a drive signal to a driving element, a residual vibration acquisition step of acquiring a residual vibration detection signal output by the residual vibration detection circuit after the determination driving step, and an ejecting section determination step of determining a state of an ejecting section based on the residual vibration detection signal acquired in the residual vibration acquisition step.