Polygonal Piezoelectric Transducer on Circular Plate
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
When a polygonal laminated piezoelectric element is placed on a circular vibration plate, the contact area is reduced, leading to decreased sound pressures due to lower vibration power, resulting in inferior sound quality compared to similar-shaped combinations.
Innovation Solution
An electroacoustic transducer design where the polygonal laminated piezoelectric element, comprising alternately stacked piezoelectric and electrode layers, is placed on a circular vibration plate, with the total volume of effective piezoelectric layers overlapping with electrode layers satisfying the condition 0.2πR2×ts≤V≤2.0πR2×ts, ensuring sufficient deformation and sound pressure equivalence to circular laminated piezoelectric elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a polygonal laminated piezoelectric element is placed on a circular vibration plate, then manufacturing cost is reduced and material yield is improved, but the contact area between the piezoelectric element and vibration plate is reduced, leading to decreased sound pressures
Solution Approach 1:
The invention applies local quality by creating a convex portion on the vibration plate that corresponds to the polygonal shape of the piezoelectric element. This localized structural modification ensures that the contact area between the piezoelectric element and vibration plate is maximized in the effective region, thereby maintaining sound pressure levels while allowing the use of cost-effective polygonal piezoelectric elements.
2Power
If a circular laminated piezoelectric element is used, then the contact area with the circular vibration plate is maximized, but manufacturing cost increases and material yield decreases
Solution Approach 1:
Instead of requiring the entire vibration plate to be modified, the invention introduces a localized convex portion that matches the polygonal shape of the piezoelectric element. This approach maintains excellent contact area in the critical region while leaving the rest of the circular vibration plate unchanged, thus preserving sound pressure performance without requiring full circular geometry.
Solution Approach 2:
The invention resolves the shape mismatch by adding a third-dimensional feature (convex portion) to the two-dimensional vibration plate surface. This dimensional change allows the vibration plate to accommodate the polygonal piezoelectric element effectively, maximizing contact area without changing the overall circular shape of the vibration plate.
3Ease of manufacture
If a rectangular vibration plate is used with a polygonal piezoelectric element, then manufacturing cost is reduced, but the deformation consistency deteriorates and sound quality drops
Solution Approach 1:
The convex portion on the vibration plate is strategically designed to match the polygonal shape of the piezoelectric element, creating a localized region of optimized contact. This ensures that the deformation of the vibration plate remains consistent and uniform in the critical area where the piezoelectric element applies force, thereby maintaining sound quality while using cost-effective polygonal elements.
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 configuration achieves sound pressures comparable to those from circular laminated piezoelectric elements, maintaining stable sound quality and reducing the risk of electrode damage from thermal shock, while being cost-effective due to the use of polygonal piezoelectric elements.
Implementation Method 1
The laminated piezoelectric element deforms according to electrical signals, and this deformation causes the vibration plate to vibrate and the electroacoustic transducer generates audible waves
Data Source
AI summary
An electroacoustic transducer includes: a polygonal-shaped laminated piezoelectric element including alternately stacked piezoelectric layers and electrode layers, with the piezoelectric layers placed between at least one pair of electrode layers having different polarities; and a circular vibration plate on which the laminated piezoelectric element is placed. Of the piezoelectric layers sandwiched between the at least one pair of electrode layers, the total volume (V) of those effective layers that overlap the at least one pair of electrode layers as viewed from the stacking direction satisfies the condition below:0.2πR2×ts≤V≤2.0πR2×ts wherein π represents the ratio of the circumference of a circle to its diameter, R represents the radius of the vibration plate, and ts represents the thickness of the vibration plate.