Stacked Substrate Isolation Assembly for PCB Vibration Protection
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Solution Overview
Problem
Conventional packaging techniques for electronic devices fail to effectively isolate vibration-sensitive components from mechanical vibrations transmitted through the underlying substrates, such as printed circuit boards.
Innovation Solution
A device assembly is mechanically bonded to an electronic circuit board using an elastic structure between two substrates, with a flexible interconnect electrically coupling the substrates. This configuration allows for vibration isolation of sensitive components by decoupling mechanical vibrations from the circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional packaging techniques are used to protect electronic devices, then mechanical protection is provided, but vibration-sensitive components are not effectively isolated from mechanical vibrations transmitted through substrates
Solution Approach 1:
The patent introduces an elastic structure as an intermediary element positioned between the substrate and the electronic component. This elastic structure serves as a mediator that transmits necessary mechanical support while filtering out harmful vibrations. The elastic structure bonds the component to the substrate but isolates it from high-frequency vibrations, thus resolving the contradiction between providing mechanical protection and achieving vibration isolation.
Solution Approach 2:
The patent employs composite packaging structures that combine rigid substrate materials with elastic isolation materials. The packaging assembly includes a substrate, an elastic structure with specific durometer properties, and an electronic component encapsulated within a protective housing. This composite approach allows the system to simultaneously achieve mechanical strength from the rigid substrate and vibration isolation from the elastic material.
2Strength
If rigid bonding is used to attach electronic components to substrates, then strong mechanical attachment is achieved, but vibration transmissions from the substrate directly affect the components
Solution Approach 1:
The patent changes the physical parameters of the bonding interface by using an elastic structure with specific durometer range (40-80 Shore A) instead of rigid bonding materials. This parameter change allows the bonding structure to maintain adequate mechanical attachment strength while introducing vibration-damping properties. The elastic structure's material properties are specifically selected to balance bonding strength and vibration isolation characteristics.
3Device complexity
If direct mounting of electronic components on substrates is used, then device complexity is minimized, but vibration-sensitive components are exposed to mechanical damage
Solution Approach 1:
The patent segments the packaging structure into distinct functional layers: a substrate layer, an elastic isolation structure layer, and a component housing layer. This segmentation allows each layer to perform its specific function - the substrate provides electrical and mechanical support, the elastic layer provides vibration isolation, and the housing provides protective encapsulation. Despite this segmentation, the overall structure remains integrated and manageable.
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 proposed solution effectively integrates vibration-sensitive devices onto conventional substrates while providing adequate vibration isolation, thereby protecting these components from mechanical damage and ensuring reliable operation.
Implementation Method 1
an elastic structure disposed between the first substrate and the second substrate that bonds the first substrate to the second substrate
Implementation Method 2
a flexible interconnect that electrically couples the first substrate to the second substrate. The first portion of the flexible interconnect transitions into a middle portion of the flexible interconnect that is free from the rigid portion of the first substrate. The middle portion of the flexible interconnect bends toward the second substrate
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
Vibration isolation can be provided for a vibration sensitive component to be bonded to electronic circuit boards or other surfaces by an assembly that includes two substrates with rigid portions that are electrically coupled to each other via a flexible interconnect. The rigid portions of the two substrates are bonded together via an elastic structure in a stacked arrangement with the first substrate above the second substrate. The flexible interconnect electrically couples the first substrate to the second substrate and the second substrate is configured to be bonded and electrically coupled to an electronic circuit board or other larger substrate via contacts on a surface of the rigid portion of the second substrate. The vibration sensitive component can be bonded to the rigid portion of the first substrate and couped to the flexible interconnect via the first substrate, thereby coupling it to the second substrate and the larger substrate.