MEMS Speaker Elastic Suspension for Low-Frequency Sensitivity
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Solution Overview
Problem
Micro-electromechanical system (MEMS) speakers with small sizes exhibit low sensitivity in low frequencies due to reduced diaphragm size and air volume, necessitating improved low frequency performance.
Innovation Solution
Incorporation of an elastic element with enhanced regions and preprocessing regions, such as bending rings, to increase displacement and amplitude, supported by a supporting element, enhancing the vibration component's sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the speaker size is reduced to millimeter level, then the speaker becomes compact and portable, but the low frequency sensitivity deteriorates due to reduced diaphragm size and air volume
Solution Approach 1:
The elastic element is divided into distinct functional regions: an enhanced region for vibration amplification, preprocessing regions for stress management, and a fixed region for anchoring. This segmentation allows each region to optimize its specific function, enabling the small diaphragm to achieve adequate low frequency sensitivity despite the compact overall size.
Solution Approach 2:
Different regions of the elastic element are given different properties: the enhanced region has optimized thickness and material properties for maximum vibration amplitude, while the fixed region has different properties for stable anchoring. The preprocessing regions have intermediate properties for stress distribution. This local differentiation enables the small speaker to achieve both compactness and adequate low frequency performance.
2Area of moving object
If the diaphragm size is reduced, then the speaker becomes more compact, but the air volume pushed is reduced leading to low sensitivity in low frequency
Solution Approach 1:
The elastic element incorporates preprocessing regions with bending rings that can dynamically deform during vibration. These regions flex and flex back, amplifying the displacement of the enhanced region. This dynamic behavior allows the small diaphragm to generate sufficient air displacement for low frequency sensitivity despite the reduced area.
Solution Approach 2:
The thickness of the elastic element is optimized in the enhanced region to balance flexibility and strength. The preprocessing regions have different thickness parameters to manage stress distribution. By carefully controlling these geometric parameters, the small diaphragm achieves adequate vibration amplitude for low frequency performance.
3Reliability
If preprocessing regions with bending rings are added to the elastic element, then the displacement and amplitude are increased improving sensitivity, but the device complexity increases
Solution Approach 1:
The preprocessing regions are integrated directly into the elastic element structure, merging the vibration amplification function with the stress management function in a single component. The bending rings are formed as continuous structures that simultaneously provide geometric reinforcement and vibration amplification, avoiding the need for separate complex mechanisms.
Solution Approach 2:
The preprocessing regions utilize curved bending rings that leverage elastic deformation to amplify vibration. The curved geometry provides inherent stress distribution and flexibility, allowing the structure to achieve high sensitivity through geometric shape rather than complex mechanical linkages.
4Reliability
If the elastic element is designed with enhanced regions and preprocessing regions, then low frequency performance is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The elastic element is manufactured with controlled variations in thickness parameter across different regions. The enhanced region has optimized thickness for vibration amplification, while the fixed region has different thickness for anchoring stability. These parameter changes can be achieved through standard manufacturing techniques like selective bonding or layered construction, maintaining feasibility.
Solution Approach 2:
The elastic element may utilize composite construction with different materials or material layers in different regions. This allows each region to have optimized properties for its specific function while using materials that are relatively easy to manufacture. The composite structure provides clear functional differentiation without requiring extremely precise manufacturing tolerances.
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 solution improves low frequency performance and sensitivity by increasing air displacement, dispersing stress, and preventing damage to the elastic elements, thereby enhancing the speaker's reliability.
Implementation Method 1
the first preprocessing region provides the enhanced region with a first displacement along a vibration direction of the enhanced region
Implementation Method 2
the second preprocessing region provides the enhanced region with a second displacement along the vibration direction of the enhanced region
Implementation Method 3
the supporting element provides the enhanced region with a third displacement along the vibration direction of the enhanced region
Data Source
AI summary
One or more embodiments of the present disclosure relate to a vibration component, including: a mass element and an elastic element. The elastic element may include an enhanced region and a first preprocessing region. The enhanced region may be configured to support the mass element, and the first preprocessing region may provide a first displacement along a vibration direction of the mass element for the mass element.