Spherical MEMS Drop Test Body for Controlled Impact Detection
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Solution Overview
Problem
Existing drop test methods for MEMS sensors in chip-scale packages fail to accurately simulate impact scenarios due to chaotic and unpredictable damage to the silicon substrate, obscuring the detection of internal mechanical defects.
Innovation Solution
A spherical drop test device with a hemispherical shell is used to encase the MEMS component, allowing for controlled impact simulation while protecting the component from external damage, and a test board is integrated to simulate the circuit board environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the MEMS sensor is dropped directly onto a hard plate, then the impact force is sufficient to test mechanical robustness, but severe damage to the outer shell and silicon substrate occurs, obscuring internal mechanical defects
Solution Approach 1:
A drop body made of plastics material is introduced as an intermediary between the MEMS sensor and the hard plate. This mediator absorbs and distributes the impact force, preventing direct contact damage to the silicon substrate and outer shell while still transmitting sufficient shock to test internal mechanical robustness
Solution Approach 2:
The plastics material shell of the drop body provides pre-established cushioning protection for the MEMS sensor. This cushioning layer is designed to attenuate extreme impact forces before they reach the fragile silicon substrate, while maintaining enough force transmission to provoke damage to internal moving micromechanical structures
2Object-affected harmful factors
If the MEMS sensor is placed in a protective drop body, then external damage is prevented, but the impact force may be reduced
Solution Approach 1:
The mechanical properties of the plastics material are carefully selected to achieve optimal balance between protection and force transmission. The material's elasticity, density, and thickness are parameterized to allow sufficient shock transmission for testing while preventing catastrophic external damage
3Adaptability or versatility
If unsoldered sensors are dropped in random orientation, then realistic impact scenarios are simulated, but chaotic impact directions make defect detection inconsistent
Solution Approach 1:
The spherical shape of the drop body ensures that regardless of the impact direction, the force is distributed uniformly across the sensor. This geometric symmetry eliminates chaotic impact scenarios and ensures consistent transmission of shock to the internal structures, improving measurement precision while maintaining random orientation capability
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 device enables controlled impact simulation, minimizing external damage and providing consistent impact distribution, thereby facilitating the detection of internal mechanical defects and enabling design improvements.
Implementation Method 1
the drop test device includes a drop body (100) having a shell (110) and having an interior space (120) for receiving at least one micromechanical component (1)
Data Source
AI summary
A drop test device for a micromechanical component. The drop test device includes a drop body having a shell and having an interior space for receiving at least one micromechanical component.