Acoustic-Cavity Vibration Sensor Structure for Stability and Sensitivity
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Solution Overview
Problem
Current vibration sensors suffer from structural instability and low sensitivity, leading to low product yield and poor performance in noisy environments.
Innovation Solution
A vibration sensor design featuring a housing that forms an acoustic cavity, separated by a vibration unit into two cavities, with a quality element and elastic element configuration that enhances structural stability and sensitivity by increasing the connection area between the elements, using materials with specific dimensions and shapes to improve sealing and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the vibration unit structure is simplified for ease of manufacture, then manufacturing cost decreases, but structural stability deteriorates
Solution Approach 1:
The vibration unit is divided into multiple quality elements (first quality element, second quality element) with different cross-sectional areas. This segmentation allows each element to perform specific functions while maintaining overall structural stability, resolving the contradiction between simplified manufacture and structural stability.
Solution Approach 2:
Different quality elements are designed with different local properties (different cross-sectional areas). The first quality element has a smaller cross-sectional area for flexibility, while the second quality element has a larger cross-sectional area for stability. This local differentiation enables the structure to achieve both ease of manufacture and structural stability.
2Measurement precision
If the quality element cross-sectional area is increased to improve sensitivity, then sensitivity improves, but device volume increases
Solution Approach 1:
The quality element is segmented into multiple portions with different cross-sectional areas. The second quality element near the acoustic transducer has a larger cross-sectional area to improve sensitivity, while the first quality element away from the transducer has a smaller cross-sectional area to reduce overall device volume. This segmentation resolves the contradiction between sensitivity and device volume.
Solution Approach 2:
Different portions of the quality element are assigned different local properties (cross-sectional areas) based on their functional requirements. The region closer to the acoustic transducer has larger area for sensitivity, while the region farther away has smaller area for compactness, achieving both sensitivity improvement and volume reduction.
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 structural stability and sensitivity, allowing the sensor to effectively convert vibration signals into electrical signals, particularly in noisy conditions, enhancing its performance in devices like headphones and hearing aids.
Implementation Method 1
the vibration unit changes an acoustic pressure within the first acoustic cavity in response to the vibration of the housing, causing the acoustic transducer to generate an electrical signal
Implementation Method 2
the elastic element is connected around a side wall of the quality element
Data Source
AI summary
A vibration sensor (200) is provided, comprising: a vibration receiver (210) including a housing (211) and a vibration unit (212), the housing (211) forming an acoustic cavity, the vibration unit (212) being located in the acoustic cavity and separating the acoustic cavity into a first acoustic cavity (213) and a second acoustic cavity (214); and an acoustic transducer (220) acoustically connected to the first acoustic cavity (213). The housing (211) is configured to generate a vibration based on an external vibration signal, the vibration unit (212) changes an acoustic pressure within the first acoustic cavity (213) in response to the vibration of the housing (211), causing the acoustic transducer (220) to generate an electrical signal. The vibration unit (212) includes a quality element (2121) and an elastic element (2122), an area of the quality element (2121) on a side away from the acoustic transducer (220) is smaller than an area of the quality element (2121) on a side close to the acoustic transducer. The elastic element (2122) is connected around a side wall of the quality element (2121).