Residual Vibration Correction for Liquid Ejection State Detection
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Solution Overview
Problem
Existing methods for determining the ejection state of a liquid ejecting apparatus based on residual vibration are insufficient in accuracy, necessitating further improvements to enhance detection precision.
Innovation Solution
A method and apparatus that include a correction information acquisition step, a correction switching step, and a correction information holding step to refine the residual vibration detection signal, followed by a determination driving step, determination switching step, and residual vibration acquisition step to accurately determine the ejection state, utilizing a switch circuit and determination circuit with correction value information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If residual vibration detection is performed without correction, then the detection process is simple, but the determination accuracy of ejection state is insufficient
Solution Approach 1:
The patent applies preliminary action by performing correction driving before the actual determination driving. A first drive waveform is applied to generate residual vibration, and the corresponding detection signal is stored as correction value information. This preliminary correction process enables accurate ejection state determination during subsequent normal operation without adding complexity to the main detection flow.
Solution Approach 2:
The patent implements feedback by using the correction detection signal obtained during correction driving to correct the residual vibration detection signal during determination driving. The determination circuit uses the stored correction value information to adjust and refine the detection signal, creating a feedback loop that continuously improves measurement accuracy.
2Measurement precision
If correction information acquisition and holding steps are added, then the accuracy of residual vibration detection signal is improved, but the number of process steps increases
Solution Approach 1:
The correction information is acquired during a preliminary correction driving phase rather than during normal determination operations. By performing the correction measurement setup in advance, the actual determination process can proceed efficiently without time loss, as the correction values are ready for immediate use.
Solution Approach 2:
The system uses itself to generate the correction information by applying a first drive waveform and measuring the resulting residual vibration. The ejecting section and detection circuit serve dual purposes: they both perform correction measurement and normal determination operations, eliminating the need for separate external correction devices and reducing overall system 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 accuracy of ejection state determination by correcting residual vibration detection signals, ensuring precise identification of ejection abnormalities and improving the quality of printed images.
Implementation Method 1
an ejecting section that includes a driving element to which a drive signal is supplied, ejects a liquid in response to driving of the driving element, and outputs a residual vibration signal according to residual vibration generated after the driving element is driven
Implementation Method 2
a piezoelectric element that ejects liquid in response to a pressure change in a pressure chamber
Data Source
AI summary
A correction information acquisition step including a correction driving step of supplying a first drive waveform signal to a driving element, a correction switching step of switching a switch circuit such that a residual vibration signal is supplied to a residual vibration detection circuit, a correction information holding step of holding a residual vibration detection signal as correction value information, a determination driving step of supplying a second drive waveform signal to the driving element, a determination switching step of switching the switch circuit such that the residual vibration signal is supplied to the residual vibration detection circuit, a residual vibration acquisition step of acquiring the residual vibration detection signal, and an ejecting section determination step of determining a state of an ejecting section based on a correction detection signal obtained by correcting the residual vibration detection signal obtained in the residual vibration acquisition step with the correction value information.