Sensor Device Vertical Spring Damper Vibration Isolation
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Solution Overview
Problem
Existing sensor devices for motor vehicle safety systems face challenges in decoupling sensor chips from external mechanical influences like vibrations, leading to measurement impairment and low fall stability due to the horizontal arrangement of components, which results in space inefficiency and increased risk of electrical short-circuits.
Innovation Solution
A vertical arrangement of the housing base part, spring/damper device, and bearer part, with the spring/damper device components on the housing base part and the bearer part above, allowing for a compact design and separate optimization of spring suspension and damping properties, and using flexible circuit boards to maintain electrical connections during deflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a horizontal arrangement of the bearer part inside a frame-shaped housing base part is used, then the chip structure can be accommodated, but the space requirement increases and the fall stability decreases
Solution Approach 1:
The patent transitions from a horizontal arrangement of the bearer part within a frame-shaped housing to a vertical arrangement where the bearer part is positioned above the housing base part. This dimensional change from horizontal to vertical space utilization reduces the lateral footprint while maintaining structural integrity and improving fall stability, as the center of gravity is lowered and the structure becomes more compact in the lateral direction.
2Reliability
If free-standing bonding wires are used for electrical contacting, then the chip structure can be electrically connected, but the risk of compression, plastic deformation, and short-circuits increases during impact
Solution Approach 1:
The patent introduces a damping element positioned between the housing base part and the bearer part that absorbs and attenuates mechanical impacts before they reach the chip structure and bonding wires. This cushioning effect prevents compression and plastic deformation of the bonding wires during impact events, maintaining electrical connection integrity without requiring more fragile protective measures.
3Measurement precision
If the bearer part is allowed to deflect relative to the housing base part for damping, then vibration isolation is achieved, but the bonding wires may be torn or detached
Solution Approach 1:
The patent introduces a damping element as an intermediary component between the housing base part and the bearer part. This intermediary absorbs mechanical energy and reduces the amplitude of relative deflections, thereby isolating the chip structure from vibrations while preventing excessive movement that could tear or detach the bonding wires. The damping element mediates between the need for vibration isolation and the need to maintain electrical connections.
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
This configuration effectively decouples sensor chips from external mechanical influences, enhances fall stability, and prevents electrical short-circuits while maintaining a compact size, ensuring precise measurements and reliable operation.
Implementation Method 1
a spring/damper device via which the housing base part and the bearer part are elastically connected to one another
Implementation Method 2
an elastic material is fashioned so that the bearer part can be elastically deflected relative to the housing base part, and a spring suspension or damping of the chip structure is enabled
Data Source
AI summary
A sensor device includes a housing base part, a bearer part, a chip structure situated on the bearer part, and a spring/damper combination via which the housing base part and the bearer part are elastically connected to one another. In the sensor device, the housing base part, the spring/damper combination and the bearer part are situated one over the other.