Piezoelectric Sound Component Lid Attachment Stability
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Solution Overview
Problem
Piezoelectric sound generation components face issues with attachment stability between the lid and case body, affecting the vibration characteristics due to the shape of the end portion, leading to reliability concerns.
Innovation Solution
A piezoelectric sound generation component design featuring a case body with a first top wall and circumferential wall, and a lid with a protruding portion having a curved first surface that abuts the case body's circumferential wall, providing improved contact and holding surfaces to enhance attachment stability and reduce vibration variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the protruding portion of the lid has a simple shape for easy manufacture, then manufacturing is easier, but the attachment stability between lid and case body deteriorates
Solution Approach 1:
The end portion of the protruding portion is formed with a curved surface having a radius of curvature R, replacing a sharp edge with a smooth curved transition. This curvature distributes stress evenly during attachment, preventing stress concentration while maintaining manufacturing simplicity through standard molding processes.
Solution Approach 2:
The curved surface is applied specifically at the end portion of the protruding portion where contact with the case body occurs, while other portions of the lid maintain their original geometry. This localized modification optimizes attachment stability only where needed without complicating the overall manufacturing process.
2Device complexity
If the protruding portion contacts the case body at a single point for simple structure, then device complexity is reduced, but vibration characteristics deteriorate due to unstable attachment
Solution Approach 1:
The curved end portion with radius of curvature R creates a line contact or area contact with the case body's circumferential wall, rather than point contact. This increases the effective contact area, stabilizing the attachment and ensuring consistent vibration characteristics without adding structural complexity.
3Manufacturing precision
If the end portion of the protruding portion has a sharp edge for precise positioning, then positioning precision is improved, but attachment stability deteriorates due to stress concentration
Solution Approach 1:
The curved surface with radius of curvature R replaces the sharp edge, eliminating stress concentration points while maintaining precise positioning through the geometric constraint of the curved profile fitting into the case body's circumferential wall recess.
Solution Approach 2:
The curved end portion acts as a stress-distributing element that prevents stress concentration before attachment occurs. The curvature is designed in advance to ensure even stress distribution during the attachment process, preventing potential failure points.
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 design improves attachment stability, reduces vibration variations, and enhances the reliability of the piezoelectric sound generation component by distributing stress evenly and securely holding the piezoelectric vibration plate.
Implementation Method 1
a piezoelectric vibration plate, a lid closing an opening of the case body and accommodating the piezoelectric vibration plate in an inner space formed by the case body and the lid, and a pin terminal that is provided to the lid so that the pin terminal abuts on the piezoelectric vibration plate
Data Source
AI summary
A piezoelectric sound generation component is provided that includes a piezoelectric vibration plate, a case with a case body and a lid that accommodates the piezoelectric vibration plate in an inner space formed by the case body and the lid, and a pin terminal provided to the lid so that the pin terminal is abutted on the piezoelectric vibration plate. The case body has a first top wall and a first circumferential wall. The lid has a second top wall, a second circumferential wall, and a protruding portion that contacts the first circumferential wall of the case body. The protruding portion has a first surface that is abutted on a contact surface, facing the first top wall, of the first circumferential wall and a second surface that couples the first surface to the second circumferential wall and is separated from the first circumferential wall.