Piezoelectric Cantilever With Cross-Linked Interdigital Electrodes
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Solution Overview
Problem
Existing piezoelectric devices with cantilever structures face inefficiencies in generating electric energy due to the arrangement of electrodes, leading to suboptimal voltage induction and energy harvesting capabilities.
Innovation Solution
A piezoelectric device with a 33-mode structure featuring interdigital electrodes on both surfaces, where the polarization direction is parallel to the longitudinal direction, and a cross-link connection between electrodes to facilitate efficient electric energy generation through deformation, utilizing a piezoelectric layer with one side fixed to a supporting member and the other deformable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If interdigital electrodes are disposed on both surfaces of the piezoelectric layer, then voltage induction efficiency is improved, but device complexity increases
Solution Approach 1:
The patent applies dimensionality change by transitioning from single-surface electrode arrangement to dual-surface electrode arrangement. Interdigital electrodes are disposed on both the first and second surfaces of the piezoelectric layer, utilizing the third dimension (depth/thickness) to increase the effective electrode area. This spatial expansion enables higher voltage induction efficiency by capturing piezoelectric effects from both surfaces simultaneously during bending deformation.
Solution Approach 2:
The electrode system is segmented into multiple interdigital electrodes on each surface, with first and second electrodes on the first surface and third and fourth electrodes on the second surface. These segmented electrodes are electrically connected through conductors to form a coordinated system that enhances voltage induction while managing the complexity through modular organization.
2Power
If polarization direction is parallel to longitudinal direction (33-mode structure), then electric energy generation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies a 33-mode piezoelectric structure where the polarization direction is parallel to the longitudinal direction of the piezoelectric layer. This parameter change in polarization orientation optimizes the piezoelectric coefficient for bending applications, enabling more efficient electric energy generation when the layer undergoes longitudinal deformation during cantilever bending.
3Power
If one side is fixed to supporting member while other side is deformable, then energy harvesting capability is improved, but structural stability decreases
Solution Approach 1:
The cantilever structure implements dynamics by fixing one end of the piezoelectric layer to a supporting member while leaving the other end free to deform. This dynamic configuration allows the structure to respond to external mechanical stimuli (vibration, impact, noise) through bending motion, converting mechanical energy into electrical energy via the piezoelectric effect, while the fixed support provides necessary structural stability.
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 device achieves higher voltage induction and more efficient electric energy generation by connecting electrodes with the same polarity in a cross-link configuration, enhancing its application in energy harvesting, sensors, and actuators.
Implementation Method 1
A piezoelectric device is a device which generates electricity through deformation due to mechanical energy such as vibration, impact, or noise applied from the outside
Implementation Method 2
A piezoelectric device is a device which generates electricity through deformation due to mechanical energy such as vibration, impact, or noise applied from the outside or which deforms due to electricity applied from the outside
Data Source
AI summary
A piezoelectric device and a method of manufacturing a piezoelectric device are provided. The piezoelectric device includes first and second electrodes disposed on a first surface of a piezoelectric layer; third and fourth electrodes disposed on a second surface of the piezoelectric layer, a first conductor electrically connecting the first and fourth electrodes, and a second conductor electrically connecting the second and third electrodes, in a cross-link with the first conductor.