Elastically Deflectable Chip Housing for Vibration Decoupling

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Solution Overview

Problem

Micromechanical sensors in vehicle electronics face significant challenges due to spurious accelerations and vibrations, leading to potential damage and malfunctions, with current solutions being costly and limiting installation flexibility.

Innovation Solution

A premold housing design incorporating a mechanical low-pass filter, where the part connected to the chip structure is elastically deflectable via a spring structure with a damping material, such as silicone, to decouple vibrations from the sensor element, allowing for reduced transmission of spurious accelerations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the housing is firmly connected to the support structure, then the housing provides stable support, but vibrations and spurious accelerations are transmitted to the chip structure

Engineering Contradiction:

Improvehousing stabilityVSAvoidvibration transmission

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The housing is divided into a first housing part connected to the chip structure and a second housing part connected to the support structure, with the spring structure separating these parts to provide vibration isolation while maintaining structural stability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The spring structure acts as an intermediary element between the first housing part and the second housing part, providing elastic connection that filters vibrations and spurious accelerations while maintaining the housing's overall stability

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If vibration-damped assembly measures are implemented for the entire assembly, then spurious acceleration influences are minimized, but the effort and cost increase significantly

Engineering Contradiction:

Improvespurious acceleration influenceVSAvoidassembly effort

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The vibration filtering function is extracted from the entire assembly and concentrated into the housing structure itself, specifically into the spring structure connecting the two housing parts, thereby reducing the need for complex assembly-wide vibration damping measures

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The housing structure provides its own vibration filtering capability through the integrated spring structure, making the system self-sufficient for vibration protection without requiring additional external vibration damping components or complex assembly procedures

Inventive Principle:

Principle #25Self-service

3Object-affected harmful factors

If the sensor is installed at locations with low spurious acceleration, then vibration damage is reduced, but installation flexibility and location options are restricted

Engineering Contradiction:

Improvevibration damage riskVSAvoidinstallation location flexibility

Core Design Contradiction:

Object-affected harmful factorsVSAdaptability or versatility

Solution Approach 1:

The spring structure converts harmful vibrations and spurious accelerations into elastic deformation, allowing the sensor to be installed in locations that would otherwise be unsuitable, thereby transforming previously harmful environments into acceptable installation locations

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

4Manufacturing precision

If the housing part connected to the chip structure is made rigid, then manufacturing precision is improved, but vibration coupling increases

Engineering Contradiction:

Improvechip structure positioning precisionVSAvoidvibration coupling

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The housing is designed with different local properties: the first housing part connected to the chip structure has localized rigidity for positioning precision, while the spring structure provides localized flexibility for vibration filtering, and the second housing part provides overall structural support

Inventive Principle:

Principle #3Local quality

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 design effectively reduces the transmission of spurious accelerations to the chip structure, enabling the use of micromechanical sensors in a wider range of automotive applications with reduced installation constraints and lower technological effort, while maintaining robustness and flexibility.

Implementation Method 1

a part (1) of the housing, which is connected to the chip structure (2), is connected in an elastically deflectable manner to a further part (3) of the housing

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

Means (5) are provided for damping the deflection of the part (1) of the housing which is connected to the chip structure (2)

Methodology Applied

Scientific EffectVibration damping: Damping

Data Source

PatentEP2019810B1Chip housing with reduced coupling-in of vibrations

Publication Date: 2012.02.22 ROBERT BOSCH GMBH

Figure 1~2

AI summary

The invention relates to a premold housing for holding a chip structure, in which a part (1) of the housing, which is connected to the chip structure (2), is connected so as to be elastically displaceable to a further part (3) of the housing which is fixed to a support structure bearing the entire housing, wherein means are available for damping (5) the displacement of the part (1) of the housing that is connected to the chip structure (2).