Piezoelectric Film Sensor With Asymmetric Electrode Rigidity
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Solution Overview
Problem
Existing piezoelectric film sensors face challenges in detecting pressing forces with high sensitivity, as the deformation of the sensor can be hindered by electrode layers with varying rigidity, leading to inconsistent force application and detection.
Innovation Solution
A piezoelectric film sensor design featuring an insulating substrate with electrodes and a conductive thin film member, where the conductive thin film member has a lower elastic modulus than the electrodes, allowing for efficient deformation transmission to the piezoelectric film, and using uniaxially stretched polylactic acid for enhanced piezoelectricity, along with a detection system that calculates voltage variations to determine holding states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a central electrode layer with high rigidity is used, then structural stability is improved, but deformation of the piezoelectric film is hindered
Solution Approach 1:
The patent applies different rigidity characteristics to different parts of the electrode structure. The central electrode layer has high rigidity for stability, while the outer electrode layers have low rigidity to allow deformation. This local differentiation resolves the contradiction by giving each region the mechanical properties it needs for its specific function.
Solution Approach 2:
The patent creates an asymmetric electrode structure where the central electrode layer differs from the outer electrode layers in both position and mechanical properties. The central layer provides structural support while the outer layers enable deformation, achieving both stability and deformation precision through asymmetric design.
2Ease of operation
If an electrode layer with small rigidity is used on the pressing surface side, then ease of deformation is improved, but pressing force transmission is reduced
Solution Approach 1:
The patent assigns different rigidity characteristics to different electrode layers based on their functional requirements. The outer electrode layers have low rigidity to facilitate deformation, while the central electrode layer has high rigidity to ensure force transmission, resolving the contradiction through localized property assignment.
3Stability of the object's composition
If the rigidity of electrode layers is increased, then structural stability is improved, but sensitivity to pressing force is reduced
Solution Approach 1:
The patent differentiates the rigidity of electrode layers by location: outer layers with low rigidity for sensitivity and deformation, central layer with high rigidity for stability. This local quality differentiation allows the sensor to maintain both structural integrity and detection sensitivity simultaneously.
Solution Approach 2:
The patent creates a composite electrode structure combining materials or configurations with different rigidity characteristics. The central electrode layer and outer electrode layers form a composite system where each component contributes its specific mechanical properties to achieve overall optimal performance.
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 sensor achieves high sensitivity in detecting pressing forces with known direction and accurately determines holding states, improving detection reliability and sensitivity compared to conventional sensors.
Implementation Method 1
a piezoelectric film having first and second opposed main surfaces is also provided with the first main surface of the piezoelectric film facing the first electrode
Data Source
AI summary
Disclosed is a piezoelectric film sensor including an insulating substrate having a first electrode formed on at least one main surface thereof, a piezoelectric film which has a first main surface and a second main surface and in which the first main surface is provided on the first electrode side, and a conductive thin film member provided on the second main surface side. The piezoelectric film sensor is characterized in that the first main surface is disposed on a pressing surface side.