Vibration Sensor Limiter Structure for Higher Sensitivity
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Solution Overview
Problem
Existing vibration sensors face challenges in controlling the size and shape of the elastic element, leading to a large volume occupied by the elastic element in the acoustic cavity, which results in a small mass element and low sensitivity.
Innovation Solution
The vibration sensor is designed with a limiter that controls the size and shape of the elastic element, separating the acoustic cavity into two parts and connecting the elastic element to the mass element and limiter, allowing for increased volume of the mass element and improved sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the elastic element is designed without a limiter, then the manufacturing process is simpler, but the elastic element occupies a large volume in the acoustic cavity, resulting in a small mass element and low sensitivity
Solution Approach 1:
The patent introduces a limiter as an intermediary component between the elastic element and the acoustic cavity. The limiter has a limiting surface that contacts the elastic element to restrict its movement and define its shape, preventing the elastic element from occupying excessive space while maintaining manufacturing simplicity.
2Measurement precision
If the mass element volume is increased to improve sensitivity, then the vibration sensor sensitivity improves, but the elastic element must be reduced in size which complicates its structural design
Solution Approach 1:
The patent divides the vibration receiver into distinct functional segments: the elastic element, the mass element, and the limiter. This segmentation allows each component to be optimized independently - the mass element can be maximized for sensitivity while the elastic element is constrained by the limiter to maintain a compact design.
3Measurement precision
If the elastic element size is reduced to accommodate a larger mass element, then the sensitivity increases, but the elastic element becomes difficult to manufacture with proper shape and size
Solution Approach 1:
The limiter serves as a manufacturing aid and functional component simultaneously. During fabrication, the limiter provides a physical boundary that guides the formation of the elastic element to the correct size and shape, making it easier to manufacture precise small-scale elastic structures.
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 limiter effectively controls the elastic element's size and shape, enhancing the sensitivity of the vibration sensor by increasing the mass element's volume, making it suitable for noisy environments and applications like bone conduction microphones.
Implementation Method 1
The vibration unit may change an acoustic pressure within the first acoustic cavity in response to the vibration of the housing, such that the acoustic transducer generates an electrical signal
Data Source
AI summary
The present disclosure provides a vibration sensor. The vibration sensor may include a vibration receiver and an acoustic transducer. The vibration receiver may include a housing, a limiter and a vibration unit. The housing and the acoustic transducer may form an acoustic cavity. The vibration unit may be located in the acoustic cavity to separate the acoustic cavity into a first acoustic cavity and a second acoustic cavity. The acoustic transducer may be acoustically connected to the first acoustic cavity. The housing may be configured to generate a vibration based on an external vibration signal. The vibration unit may change an acoustic pressure within the first acoustic cavity in response to the vibration of the housing, such that the acoustic transducer generates an electrical signal. The vibration unit may include a mass element and an elastic element. A first side of the elastic element may be connected around a side wall of the mass element. A second side of the elastic element may be connected with the limiter.