Layered Piezoelectric Film for Smoothness and Thermal Stability
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Solution Overview
Problem
Existing piezoelectric films, particularly those made of fluorine-based resins, suffer from surface waviness and reduced smoothness due to stretching or thermal poling treatments, leading to defects in lamination processes and decreased sensitivity.
Innovation Solution
A laminated piezoelectric film structure is developed, where a protective film with specific rigidity and thickness is applied to a piezoelectric film, ensuring a rigidity ratio of 1.0 to 20 times and thickness of 50 to 200 μm, enhancing thermal stability and smoothness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stretching treatment or thermal poling treatment is performed to enhance piezoelectricity, then piezoelectric sensitivity is improved, but surface smoothness deteriorates due to large waviness
Solution Approach 1:
The invention divides the piezoelectric film into multiple layers with different functions: a piezoelectric layer for sensitivity and a separate smoothness control layer to maintain surface quality. This segmentation allows each layer to optimize its specific function without compromising the other.
Solution Approach 2:
The invention applies different properties to different parts of the film structure. The piezoelectric layer undergoes stretching or thermal poling treatment to enhance local piezoelectric sensitivity, while the smoothness control layer maintains overall surface smoothness, creating local quality differentiation.
2Manufacturing precision
If protective film with high rigidity is laminated to improve smoothness, then surface smoothness is improved, but thermal stability may deteriorate due to curling
Solution Approach 1:
The invention carefully controls the rigidity parameter of the protective film within a specific range (1.0 to 20 times the rigidity of the piezoelectric film) to achieve the optimal balance between smoothness improvement and thermal stability maintenance, preventing both excessive waviness and heat-induced curling.
3Manufacturing precision
If protective film is laminated to improve smoothness, then surface quality is improved, but rigidity may be insufficient if film thickness is not properly controlled
Solution Approach 1:
The invention optimizes the thickness parameter of the protective film to be within 50-200 μm, which provides sufficient rigidity to maintain surface smoothness and prevent waviness while avoiding excessive thickness that would cause brittleness or difficulty in processing.
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 film achieves high rigidity, thermal stability, and improved smoothness, reducing defects and maintaining sensitivity.
Implementation Method 1
a rigidity B of the protective film is 1.0 times or more and 20 times or less a rigidity A of the piezoelectric film
Implementation Method 2
a method of detecting a change in charge of a piezoelectric material
Data Source
AI summary
A laminated piezoelectric film having high rigidity and excellent thermal stability and smoothness. The laminated piezoelectric film includes a piezoelectric film and a protective film laminated on one surface of the piezoelectric film, in which a rigidity of the protective film is 1.0 times or more and 20 times or less the rigidity of the piezoelectric film, and a thickness of the protective film is 50 μm or more and 200 μm or less.