Piezoelectric Element With Convex Substrate Surfaces
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Solution Overview
Problem
Conventional piezoelectric elements have low sensitivity, limiting their effectiveness in detecting and converting mechanical forces into electrical signals.
Innovation Solution
A piezoelectric element design featuring substrates with convex portions on either side of the piezoelectric part, along with electrode layers, enhances sensitivity by allowing deformation and efficient charge generation under applied pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional piezoelectric element uses flat substrates, then the manufacturing process is simple, but the sensitivity is low
Solution Approach 1:
The patent applies curvature to the substrate surfaces by introducing convex portions (protrusions) on the substrates. This curved surface design increases the contact area and deformation efficiency between the substrate and piezoelectric part, thereby enhancing sensitivity without significantly complicating the manufacturing process
Solution Approach 2:
The patent introduces convex portions at specific locations on the substrates rather than making the entire substrate complex. This localized structural modification concentrates the deformation effect at key areas, improving sensitivity while maintaining overall manufacturing simplicity
2Measurement precision
If the piezoelectric element uses increased contact area between substrate and piezoelectric part, then sensitivity improves, but manufacturing precision requirements increase
Solution Approach 1:
The convex portions provide a curved contact surface that naturally increases contact area with the piezoelectric part. The curved geometry is easier to manufacture with standard molding techniques compared to flat precision surfaces, reducing the stringency of manufacturing precision requirements while still achieving increased contact area
3Productivity
If conventional wire connections are used to derive charge, then the structure is simple, but the charge derivation efficiency is low
Solution Approach 1:
The patent replaces the conventional wire connection mechanism with a direct electrode layer integration approach. The electrode layers are formed directly on the substrate surfaces, creating more efficient electrical contact and charge derivation pathways, thereby improving charge derivation efficiency
Solution Approach 2:
The patent merges the electrode structure with the substrate by forming electrode layers directly on the substrate surfaces. This integration eliminates the need for separate wire connections and improves charge derivation efficiency through direct electrical contact between the piezoelectric part and electrodes
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 design improves sensitivity, enabling the piezoelectric element to generate a current even under small pressures, thus enhancing the utilization of the piezoelectric effect and simplifying the manufacturing process.
Implementation Method 1
The piezoelectric technology is the technology based on a piezoelectric effect. When the dielectric is deformed due to an external force in a certain direction, its interior will generate polarization phenomenon, and positive and negative charges will appear on its two opposite surfaces.
Data Source
AI summary
A piezoelectric element includes: a piezoelectric part; a first substrate and a second substrate, provided at both sides of the piezoelectric part, respectively; a first electrode layer, located between the first substrate and the piezoelectric part; and a second electrode layer, located between the electrode substrate and the piezoelectric part, wherein a surface of at least one of the first substrate and the second substrate close to the piezoelectric part is provided with a convex portion.