Piezoelectric Component Case with Thickened Side Walls
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Solution Overview
Problem
Piezoelectric sound-generating components with insert terminals on the side wall face challenges in suppressing weld lines, which degrade durability and cause variations in sound pressure distribution, due to thinner wall thickness and complex resin flow during injection molding.
Innovation Solution
The design incorporates thick parts on the side walls where insert terminals are located, with a larger transverse width than adjacent areas, to improve resin flow and reduce weld line formation, maintaining resonance space size while enhancing strength and reducing component size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the side wall thickness is reduced to decrease component size, then the component size is reduced, but weld lines occur more frequently degrading durability
Solution Approach 1:
The side wall is designed with non-uniform thickness, featuring a thick part at the insert terminal provision position and thinner adjacent parts. This local quality variation allows the thick part to suppress weld line occurrence and maintain durability, while the overall component size remains reduced due to the thinner adjacent sections.
2Volume of moving object
If the side wall thickness is reduced to decrease component size, then the component size is reduced, but the strength of the case is degraded
Solution Approach 1:
The side wall incorporates a thick part specifically at the insert terminal provision position, providing localized strength enhancement. This allows the case to maintain sufficient strength for structural integrity and terminal support, while other areas can be thinner to reduce overall component size.
3Reliability
If the side wall thickness is increased to suppress weld lines, then durability is improved, but the resonance space size is reduced
Solution Approach 1:
The thick part is localized specifically at the insert terminal provision position where weld lines are most likely to occur. This targeted approach suppresses weld line formation and improves durability without increasing the thickness of the entire side wall, thereby preserving the resonance space volume.
4Ease of manufacture
If the side wall structure is simplified to ease manufacture, then manufacturing is easier, but weld line occurrence increases
Solution Approach 1:
The side wall features a localized thick part at the insert terminal provision position, which can be integrated into the injection molding process. This design variation is straightforward to manufacture using standard molding techniques while effectively suppressing weld line occurrence at the critical terminal area.
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 effectively reduces weld line occurrence, maintains resonance space size, and achieves high reliability with improved sound pressure distribution, achieving high sound pressure levels in a compact and durable piezoelectric sound-generating component.
Implementation Method 1
a piezoelectric body 32 that vibrates when a voltage is applied thereto
Data Source
AI summary
A piezoelectric sound-generating component case that includes a case body for housing a vibrating plate and insert terminals that are provided in the case body for applying a voltage to the vibrating plate. The case body includes a bottom or base and a side wall that projects from the peripheral edge of the bottom. The case body is provided with an opening that opens on the leading end side, in the projection direction, of the side wall. The side wall has thick parts at least on the sides where the insert terminals are provided. In a plan view of the case body, the transverse direction width of the thick parts of the side wall is larger than the transverse direction width of the parts of the side wall that are adjacent to the thick parts.