Piezoelectric Sound Component Case Step for Stable Acoustic Pressure
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Solution Overview
Problem
Existing piezoelectric sound components face challenges in achieving stable acoustic pressure characteristics due to difficulties in forming extra-fine slits in thin diaphragms, which can lead to deformation and impairment of acoustic conversion efficiency.
Innovation Solution
A piezoelectric sound component design featuring a piezoelectric diaphragm with a middle portion and a peripheral portion, where the peripheral portion includes a first and second portion fixed and movable relative to a case with a step configuration, creating a clearance to suppress air convection without slits, ensuring structural simplicity and ease of fabrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If through-slits are formed in the diaphragm to suppress air convection, then acoustic pressure characteristics improve, but manufacturing precision deteriorates due to difficulty in forming extra-fine slits and component-to-component variations
Solution Approach 1:
The invention extracts the air convection suppression function from the diaphragm material itself and relocates it to the air chamber structure. By forming partitions in the air chambers, the patent eliminates the need for slits in the diaphragm, thereby avoiding manufacturing precision issues while maintaining acoustic pressure characteristics.
Solution Approach 2:
The invention introduces partitions as an intermediary structure in the air chambers to suppress air convection. These partitions act as a mediator that achieves the same acoustic effect as diaphragm slits but without the manufacturing difficulties, as the partitions are formed in the air chamber rather than in the thin diaphragm.
2Reliability
If through-slits are formed in the diaphragm to suppress air convection, then acoustic pressure characteristics improve, but device complexity increases due to additional formation processes
Solution Approach 1:
The invention extracts the air convection suppression function from the diaphragm manufacturing process and relocates it to the air chamber structure. This eliminates the need for complex slit formation processes in the diaphragm, thereby reducing device complexity while maintaining acoustic pressure characteristics.
3Power
If the diaphragm is made thinner to produce large displacement and high acoustic pressure, then acoustic conversion efficiency improves, but manufacturing precision deteriorates due to difficulty in forming extra-fine slits
Solution Approach 1:
The invention extracts the air convection suppression function from the thin diaphragm and relocates it to the air chamber partitions. This allows the diaphragm to be made thinner for improved acoustic conversion efficiency without the manufacturing precision issues associated with forming slits in thin materials.
4Manufacturing precision
If slits are made wider to ease manufacturing, then manufacturing precision improves, but acoustic pressure characteristics deteriorate due to reduced air convection suppression effect
Solution Approach 1:
The invention extracts the air convection suppression function from the diaphragm slits and relocates it to the air chamber partitions. This allows the partitions to be made with larger dimensions for easier manufacturing while maintaining the air convection suppression effect, as the partition structure is more effective than narrow slits.
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 maintains excellent acoustic pressure characteristics while preserving acoustic conversion efficiency by minimizing air convection and reducing component variations, thus enhancing stability and reducing production costs.
Implementation Method 1
The piezoelectric sound component includes a piezoelectric diaphragm and a case. The piezoelectric diaphragm includes a diaphragm and a piezoelectric member.
Implementation Method 2
The case includes a step that is in positional agreement with the second peripheral portion in a thickness direction of the diaphragm. Moreover, a clearance (or space) is defined between the step and the second peripheral portion.
Data Source
AI summary
A piezoelectric sound component is provided that includes a piezoelectric diaphragm and a case. The piezoelectric diaphragm is accommodated in the case. Moreover, a diaphragm 10 has a peripheral portion that includes a first peripheral portion and a second peripheral portion. The first peripheral portion is fixed to the case and the second peripheral portion is movable relative to the case. The case includes a step that is in positional agreement with the second peripheral portion in the thickness direction of the diaphragm. The step and the second peripheral portion define a clearance therebetween.