Print Head Ejection State Detection Under Piezo Crosstalk
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Solution Overview
Problem
Existing liquid ejecting apparatuses, such as ink jet printers, face challenges in accurately determining the ejection state of one ejection section due to the influence of the presence/absence of driving in other ejection sections, leading to ejection abnormalities.
Innovation Solution
A liquid ejecting apparatus with multiple ejection sections, a common liquid chamber, a detection section, and a determination section that employs different determination modes based on the driving state of piezoelectric elements to accurately assess the ejection state of individual sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single determination mode is used to detect ejection state based on piezoelectric element potential, then the detection method is simple, but the determination accuracy deteriorates due to influence from adjacent ejection sections
Solution Approach 1:
The patent applies dynamics by making the determination mode variable rather than fixed. The system dynamically switches between first and second determination modes based on the driving state of adjacent ejection sections. When adjacent sections are driven, the first determination mode is used; when they are not driven, the second determination mode is used. This dynamic adaptation resolves the contradiction by allowing accurate ejection state detection under different operating conditions without requiring a single complex determination system.
Solution Approach 2:
The patent changes the determination parameters based on the driving state of adjacent ejection sections. By switching between different determination modes with different threshold values and evaluation criteria, the system adapts to varying operational conditions. This parameter change approach allows accurate ejection state determination while managing complexity through conditional logic rather than requiring entirely separate detection systems for each scenario.
2Reliability
If the ejection state of one ejection section is determined without considering adjacent sections, then the determination process is simple, but the reliability deteriorates due to crosstalk from neighboring sections
Solution Approach 1:
The patent implements feedback by using the driving state information of adjacent ejection sections to adjust the determination process for the target ejection section. The system feeds back the operational status of neighboring sections and uses this information to select appropriate determination modes. This feedback mechanism improves reliability by accounting for crosstalk effects while maintaining manageable complexity through systematic information utilization.
Solution Approach 2:
The patent applies preliminary action by determining the driving state of adjacent ejection sections before performing the ejection state determination. This preliminary assessment allows the system to pre-select the appropriate determination mode, ensuring that the correct evaluation criteria are applied from the start. This approach improves reliability by preparing the determination system in advance based on known conditions, rather than attempting to correct errors after determination.
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 accounting for the influence of adjacent ejection section driving, thereby reducing ejection abnormalities and improving print quality.
Implementation Method 1
a first piezoelectric element that is driven by a drive signal, a first pressure chamber filled with a liquid and having a volume changed according to driving of the first piezoelectric element
Implementation Method 2
a detection section detecting a potential of the first piezoelectric element
Data Source
AI summary
A liquid ejecting apparatus including: a plurality of ejection sections including a first ejection section including a first piezoelectric element that is driven by a drive signal, and a second ejection section including a second piezoelectric element that is driven by the drive signal; a detection section detecting a potential of the first piezoelectric element; and a determination section determining an ejection state of the first ejection section according to a detection result of the detection section using a determination mode selected from among a plurality of determination modes, in which the determination section determines the ejection state of the first ejection section using a first determination mode when the second piezoelectric element is driven, and determines the ejection state of the first ejection section using a second determination mode when the second piezoelectric element is not driven.