PVDF Piezoelectric Sensor with Surrounding Shield Film
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Solution Overview
Problem
Conventional piezoelectric sensors using PVDF films face challenges in productivity and measurement efficiency due to complex handling processes, risk of short circuits, and incomplete utilization of film surfaces, leading to reduced sensitivity and increased costs.
Innovation Solution
A piezoelectric sensor design featuring a PVDF film with an electrode layer on one surface, a substrate with spaced electrodes, a non-conductive layer, and conductive shield films that surround the stack, eliminating the need for additional insulation and simplifying the manufacturing process, while improving signal-to-noise ratio and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If electrodes are sequentially printed on both surfaces of a cut PVDF film, then complete electrode coverage is achieved, but the number of process steps increases and productivity decreases
Solution Approach 1:
The patent merges the functions of both front and rear surface electrodes into a single electrode layer on one surface of the PVDF film. This single electrode layer works in conjunction with the conductive shield film that surrounds the stack to provide complete electrical functionality, thereby reducing the number of printing steps from two to one while maintaining electrode coverage.
Solution Approach 2:
The conductive shield film serves multiple functions: it acts as a second electrode, provides electrical connection, and surrounds the stack structure. This multi-functional component replaces the need for separate rear surface electrodes and additional insulation layers, simplifying the manufacturing process.
2Area of stationary object
If electrode patterns are printed close to the edges of the PVDF film, then film surface utilization is maximized, but the risk of short circuit increases
Solution Approach 1:
The patent introduces a non-conductive layer as an intermediary between the electrode layer and the surrounding conductive shield film. This non-conductive layer prevents direct contact between conductive elements, eliminating short circuit risk while allowing electrode patterns to extend to the edges of the PVDF film for maximum surface utilization.
Solution Approach 2:
The patent transitions from a planar two-electrode configuration to a three-dimensional structure where one electrode is on the film surface and the other is a surrounding shield. This dimensional change allows complete film surface usage while maintaining electrical isolation through the vertical arrangement and non-conductive layer.
3Reliability
If additional insulating layers are added to prevent short circuits, then reliability improves, but device complexity and manufacturing steps increase
Solution Approach 1:
The non-conductive layer serves multiple functions simultaneously: it provides electrical insulation to prevent short circuits, acts as a protective barrier, and enables the conductive shield film to function as a second electrode. This multi-functional approach eliminates the need for separate insulating layers, reducing device complexity while maintaining reliability.
4Manufacturing precision
If multiple process steps are used to form electrode layers and insulating layers on both sides, then manufacturing precision is maintained, but productivity and measurement efficiency decrease
Solution Approach 1:
The patent combines the formation of both electrode layers into a single printing process on one surface, and integrates the insulating function into the non-conductive layer that is part of the shield film structure. This merging reduces the number of sequential steps from multiple printing and coating operations to a simplified process, improving productivity while maintaining precision through controlled single-step deposition.
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
This design enhances productivity, improves sensor performance by utilizing the entire film surface, and reduces manufacturing costs by simplifying the process and increasing sensitivity through improved signal transmission.
Implementation Method 1
PVDF is a ferroelectric polymer which efficiently exhibits piezoelectric and pyroelectric characteristics
Data Source
AI summary
The present invention relates to a piezoelectric sensor using a piezoelectric polyvinylidene fluoride (PVDF) film. As an embodiment, there is proposed a piezoelectric sensor including: a PVDF film; an electrode layer which is formed on the top surface of the PVDF film; a substrate which is provided with a first electrode electrically connected to the electrode layer and a second electrode disposed at a location spaced apart from the first electrode; a non-conductive layer which covers the electrode layer; a first shield film which is electrically connected to the second electrode while being attached to the non-conductive layer; and a second shield film which is attached to the top surface of the PVDF film, and is connected to the first shield film while surrounding a stack of the PVDF film to the non-conductive layer.