PCB Retaining Apparatus With Flexible Fingers and Deflection Walls
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Solution Overview
Problem
Existing mounting techniques for printed circuit boards (PCBs) in electronic devices, such as clipping or fastening with screws, are inadequate to mitigate stresses and damage from mechanical shocks, particularly in smaller-sized devices subjected to extreme conditions like drops from heights of 20 feet or more.
Innovation Solution
A retaining apparatus with a support member, flexible finger members, and wall members that provide restoring forces to grip and retain the PCB, while the wall members restrict deflection in sensitive areas, formed as a single molded component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional clipping or screw fastening techniques are used to mount PCBs, then the PCB is securely retained, but the PCB and its components are vulnerable to damage from mechanical shocks and drops
Solution Approach 1:
The patent applies beforehand cushioning by incorporating flexible finger members that can deflect and absorb shock forces before they reach the PCB components. The finger members act as cushioning elements that deform during impact events, protecting the rigid PCB and its components from the full force of mechanical shocks and drops.
Solution Approach 2:
The patent employs parameter changes by using flexible finger members with specific material properties and geometric configurations that allow controlled deflection. The finger members are designed with varying thicknesses, lengths, and cross-sectional shapes to optimize their shock-absorbing characteristics while maintaining secure retention of the PCB under normal operating conditions.
2Object-affected harmful factors
If flexible finger members are used to retain the PCB, then shock absorption is improved, but deflection control in sensitive areas may be insufficient
Solution Approach 1:
The patent applies segmentation by dividing the support structure into multiple discrete finger members, each capable of independent deflection. This segmentation allows different regions of the PCB to have tailored support characteristics, with some areas allowing controlled deflection for shock absorption while other areas maintain stability for component protection.
Solution Approach 2:
The patent implements local quality by designing finger members with non-uniform cross-sections and varying material distributions along their lengths. This allows specific regions of the finger members to have different stiffness characteristics, providing localized shock absorption where needed while maintaining rigidity in areas requiring stable PCB support for sensitive components.
3Adaptability or versatility
If the retaining apparatus is designed with multiple components, then functionality is enhanced, but manufacturing complexity and cost increase
Solution Approach 1:
The patent applies merging by integrating multiple functional elements into a single molded support structure. The support member, finger members, and retaining features are combined into one monolithic component that can be manufactured in a single injection molding process, reducing assembly steps and manufacturing complexity while maintaining all necessary retention and shock-absorption functionalities.
Solution Approach 2:
The patent implements universality by designing the support member to perform multiple functions simultaneously: providing structural support, enabling PCB retention through integrated finger members, absorbing shock through controlled deflection, and protecting sensitive areas through strategically positioned features. This multi-functional design reduces the need for separate components and simplifies the overall assembly.
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 apparatus effectively minimizes shock-induced damage to PCBs and their components by providing robust retention and deflection control, enhancing durability in harsh conditions.
Implementation Method 1
Each of the finger members extends away from the second side of the support member and has a restoring force (e.g., a spring force) toward the center of the support member
Data Source
AI summary
A retaining apparatus for a printed circuit board (PCB) includes a support member, flexible finger members positioned proximate a periphery of the support member, and at least one wall member. The support member has a first side and a second side (e.g., a top side and an underside). Each finger member extends away from the second side of the support member and has a restoring force toward the center of the support member. Each wall member also extends away from the second side of the support member and is sized and shaped to restrict deflection of at least one area of the PCB in the event that the PCB is subjected to at least one externally applied force after being positioned between the finger members. The retaining apparatus and the PCB may together form a PCB module for use in an electronic device, such as an Internet of Things sensor.