Sensor Module Vibration Damping via Elastic Member Resonance
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Solution Overview
Problem
Existing sensor modules face challenges in stabilizing mechanical vibrations generated by impacts, as viscous damping elements tend to change state, making it difficult to effectively dampen vibrations and maintain sensor stability.
Innovation Solution
A sensor module design incorporating a first and second elastic member with specific resonance frequencies, where the first elastic member is in contact with the sensor substrate and the lid, and the second elastic member is in contact with the substrate on the opposite side, ensuring resonance frequencies f2 < f3 < f1 and f2 < f4 < f1, with both elastic members made of rubber and having shore A hardness between 5 and 30, to effectively dampen vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a viscous body is used as a damping element, then mechanical vibration of the sensor unit can be dampened, but the state of the viscous body tends to change making it difficult to maintain stable damping performance
Solution Approach 1:
The patent changes the material parameter from viscous body to elastic body with specific resonance frequency characteristics. The elastic body's resonance frequency is designed to be lower than the sensor unit's resonance frequency, providing stable damping performance without state changes. This parameter change resolves the contradiction by maintaining consistent mechanical properties while effectively dampening vibrations.
Solution Approach 2:
The patent utilizes the resonance frequency characteristic of the elastic body to convert potential harmful resonance into beneficial damping effect. By designing the elastic body's resonance frequency to be lower than the sensor unit's resonance frequency, the elastic body absorbs vibrational energy effectively, transforming what could be unstable state changes into reliable vibration dampening performance.
2Object-affected harmful factors
If elastic members with specific resonance frequencies are used, then vibration dampening performance is improved, but the device structure becomes more complex
Solution Approach 1:
The patent merges the damping function with the mounting structure by integrating the elastic body directly into the sensor unit assembly. The elastic body serves both as a mounting element and as a vibration damping element, eliminating the need for separate damping components. This merging reduces device complexity while maintaining effective vibration dampening through resonance frequency design.
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 ensures stable measurement of acceleration by preventing adverse resonance frequency interference, allowing the sensor module to withstand impacts and maintain accurate output without excessive vibration effects, while adjusting resonance frequencies through elastic member compression.
Implementation Method 1
a first elastic member in contact with a first main surface of the first substrate and the accommodator, and a second elastic member in contact with a second main surface of the first substrate
Implementation Method 2
the first elastic member and the second elastic member may be pressurized, the resonance frequency f3 may be the resonance frequency of the pressurized first elastic member, and the resonance frequency f4 may be the resonance frequency of the pressurized second elastic member
Data Source
AI summary
A sensor module includes a sensor, a first substrate on which the sensor is mounted, a second substrate coupled to an external connector, conductive members that couple the first substrate and the second substrate, an accommodator that accommodates the first substrate, the second substrate, and a conductive member therein, a lid that closes an opening of the accommodator, a first elastic member in contact with a first main surface of the first substrate and the accommodator, and a second elastic member in contact with a second main surface of the first substrate and the lid. A resonance frequency f1 of the sensor, a resonance frequency f2 of the conductive member, a resonance frequency f3 of the first elastic member, and a resonance frequency f4 of the second elastic member satisfy f2<f3<f1 and f2<f4≤f1.