Piezoelectric Sounding Component Bubble Management
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Solution Overview
Problem
Conventional piezoelectric sounding components face reliability issues due to the formation of bubbles in elastic adhesives during heating processes, which can cause instability and breakage of conductive adhesives, leading to potential electrical failures.
Innovation Solution
The design incorporates a recessed portion in the support structure to accommodate bubbles, preventing them from forming in the elastic adhesive and ensuring stable adhesion of conductive adhesives, with a frame-like sealing portion to maintain electrical connectivity and prevent bubble expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If elastic adhesive is coated on the support portion to join the diaphragm to the casing, then the diaphragm is securely attached to the casing, but bubbles form between the support portion and the diaphragm during the process
Solution Approach 1:
The support portion is divided into a flat portion and a recessed portion, creating distinct functional zones. The recessed portion specifically accommodates bubbles away from the adhesive coating area, while the flat portion provides a stable surface for adhesive application and diaphragm attachment.
Solution Approach 2:
The harmful bubbles are extracted from the adhesive layer by providing a dedicated recessed portion that captures and isolates them. This prevents bubbles from being trapped within the elastic adhesive and conductive adhesive layers, eliminating the source of reliability problems.
2Strength
If heating process is applied to the piezoelectric sounding component, then the adhesives are cured and bonds are strengthened, but existing bubbles expand and deform the elastic adhesive
Solution Approach 1:
The recessed portion is pre-formed in the support portion before adhesive application. This preliminary structural feature ensures that during subsequent heating and curing processes, bubbles have a predetermined accommodation space, preventing them from deforming the adhesive surfaces.
3Reliability
If conductive adhesive is coated on the elastic adhesive to establish electrical connection, then electrical connectivity is achieved, but the shape instability of elastic adhesive increases the risk of conductive adhesive breakage
Solution Approach 1:
The recessed portion acts as an intermediary structure between the support portion and the adhesive layers. It provides a stable geometric constraint that prevents elastic adhesive deformation, thereby protecting the conductive adhesive from breakage while maintaining electrical connectivity.
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 enhances the reliability of the piezoelectric sounding component by preventing bubble-induced instability in the conductive adhesives, ensuring a stable electrical connection and reducing the risk of breakage, thereby improving the overall performance and durability.
Implementation Method 1
a piezoelectric body 33 formed on the metal plate 31
Data Source
AI summary
A piezoelectric sounding component includes a diaphragm that includes a metal plate and a piezoelectric body formed on the metal plate. The diaphragm bends and vibrates according to application of voltage to the piezoelectric body. A casing includes a bottom wall, side walls which, in combination with the diaphragm define a sound chamber. The diaphragm is supported by a support portion formed in the casing such that outer peripheral edges of the diaphragm are spaced from inner surfaces of the casing. A terminal is located on the casing and is electrically connected to the diaphragm. At least two elastic adhesives join the diaphragm to the casing and respective conductive adhesives extend over its associated elastic adhesive from the diaphragm to a respective terminal. A frame-like sealing portion seals a gap between the outer peripheral edge of the diaphragm and the inner surfaces of the casing. A recessed portion is formed in a portion of the support portion facing the terminal such that the first elastic adhesive extends over the recessed portion.