Raised-Electrode Laminated Piezoelectric Sheet for Uniform Signal Output
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Solution Overview
Problem
Existing laminated piezoelectric sheets suffer from varying signal intensity and in-plane variation, particularly in large-sized sensor devices, and have complex production processes that hinder mass production and consistent performance.
Innovation Solution
A laminated piezoelectric sheet with a raised pattern on the electrode surface, featuring specific concave-convex shapes and dimensions, is used to enhance signal intensity and reduce in-plane variation, while allowing for mass production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a flat electrode is used in large-sized sensor devices, then the device can be manufactured simply, but the signal intensity varies greatly depending on position
Solution Approach 1:
The electrode surface is designed with localized concave-convex patterns instead of being uniformly flat. This creates different surface properties in different regions, where the convex portions provide contact points and the concave portions create spacing, thereby achieving uniform signal intensity distribution across large-sized sensor devices while maintaining manufacturability
Solution Approach 2:
The electrode surface incorporates curved concave-convex patterns rather than flat or angular features. The curved geometry helps distribute mechanical stress and electrical field more evenly across the electrode-piezoelectric film interface, reducing position-dependent signal variation in large-sized devices
2Reliability
If embossing is performed on the piezoelectric film surface, then contact with electrode is improved, but the production process becomes complicated and mass production is hindered
Solution Approach 1:
Instead of embossing the piezoelectric film surface to improve contact, the invention inverts the approach by providing the concave-convex pattern on the electrode surface itself. This maintains reliable electrode-piezoelectric film contact while avoiding complex processing of the piezoelectric film, thereby enabling mass production
Solution Approach 2:
The electrode surface is segmented into multiple convex portions and concave portions rather than being a continuous flat surface. This segmentation allows the electrode to maintain contact at multiple discrete points while creating spacing in between, improving reliability without requiring complex embossing of the piezoelectric film
3Manufacturing precision
If charging treatment is performed after providing concave and convex on the surface, then the electrode contact is optimized, but charge amount deviation occurs between concave and convex portions
Solution Approach 1:
The concave-convex pattern is provided on the electrode surface before the charging treatment of the piezoelectric film. This preliminary structuring ensures that when charging occurs, the electric field is uniformly distributed across the piezoelectric film surface, preventing charge amount deviation between different regions and maintaining manufacturing precision
4Ease of manufacture
If conventional coating or vapor deposition methods are used to provide conductive layer, then the conductive layer can be formed, but the piezoelectric performance deteriorates due to solvent permeation or temperature increase
Solution Approach 1:
The invention replaces chemical coating or thermal vapor deposition methods with a mechanical lamination approach. The conductive electrode is directly laminated onto the piezoelectric film surface, eliminating the need for solvents or high temperatures that would permeate or damage the piezoelectric material, thereby maintaining piezoelectric performance while achieving conductive layer formation
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 laminated piezoelectric sheet achieves consistent and high signal intensity with minimal variation, suitable for various applications, and can be produced efficiently on a large scale.
Implementation Method 1
A piezoelectric film using a resin film is known to exhibit an excellent piezoelectric effect and is widely used for vibration power generation, a sensor device, and the like
Implementation Method 2
The electret is a material with semipermanently polarized in a part of the material and is obtained by thermally or electrically treating a material which is hard to conduct electricity such as a polymer material and an inorganic material
Data Source
AI summary
Disclosed is a laminated piezoelectric sheet having an electrode laminated on at least one surface of a piezoelectric film, in which the electrode has a raised pattern on a surface on a side in contact with the piezoelectric film. It is possible to provide a laminated piezoelectric sheet that has good signal intensity and little in-plane variation of signal intensity as well as enabling mass production.