Screw Boss Assemblies for Electronics Mounting
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Solution Overview
Problem
Existing mounting systems for electronics in personal devices face challenges in providing both mechanical strength and electrical grounding, especially when dealing with dissimilar metals that can lead to welding difficulties and corrosion, and require solutions that can withstand drop tests and other impact-related stress.
Innovation Solution
The system involves creating screw bosses on formable substrates using dimples and adhesives, where the screw bosses are threaded onto the dimples to provide both mechanical and electrical connections, allowing for the use of conductive materials and overcoming issues with dissimilar metals by using threads and adhesive for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welding is used to attach mounting bosses to the case, then mechanical strength is improved, but dissimilar metal corrosion and welding difficulties occur
Solution Approach 1:
The patent introduces an adhesive as an intermediary substance between the mounting boss and the case, replacing direct welding contact. This adhesive layer prevents direct interaction between dissimilar metals, eliminating galvanic corrosion while still providing strong mechanical attachment. The adhesive serves as a mediator that transfers mechanical loads without requiring metallurgical bonding between incompatible materials.
2Adaptability or versatility
If dissimilar metals are used for case and mounting bosses, then aesthetic and functional requirements are met, but welding becomes difficult or impossible
Solution Approach 1:
The patent replaces the welding process (a thermal/mechanical joining method) with an adhesive bonding process (a chemical/mechanical joining method). This substitution allows dissimilar metals to be joined without the metallurgical compatibility requirements of welding, enabling greater material selection flexibility while maintaining ease of manufacture through proven adhesive bonding techniques.
3Strength
If traditional mounting systems are used, then mechanical attachment is achieved, but electrical grounding is not provided
Solution Approach 1:
The patent merges two separate functions into a single mounting boss component: mechanical attachment and electrical grounding. The mounting boss is designed with conductive material and configured to simultaneously provide structural mounting capability and electrical connection pathway to ground, eliminating the need for separate mechanical and electrical connection systems.
4Reliability
If conductive materials are used for mounting bosses, then electrical grounding is provided, but dissimilar metal corrosion increases
Solution Approach 1:
The adhesive acts as an electrochemical intermediary that isolates the conductive mounting boss from direct contact with the case material. This prevents galvanic cell formation between dissimilar conductive metals, allowing the mounting boss to maintain its electrical conductivity for grounding purposes while the adhesive barrier prevents corrosion by blocking the electrochemical reaction pathway.
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 solution ensures reliable and durable mounting of electronics by providing both mechanical strength and electrical grounding, while avoiding the challenges of dissimilar metal corrosion and welding difficulties, and allows for the use of aesthetically pleasing materials with desired physical properties.
Implementation Method 1
a conductive adhesive is applied over a portion of the substrate proximate to the dimple. The screw boss is then threaded onto the dimple such that the base of the screw boss is attached to the substrate using the conductive adhesive
Data Source
AI summary
Systems and methods for providing screw bosses on a substrate. The substrate can be dimpled. The dimples can then be threaded to accept screw bosses. The dimples can be threaded using a threading die or can have threads cut by self-tapping screw bosses. An adhesive can be applied to the substrate, the bottom of the screw boss, or both. The screw bosses can include standoffs to determine the distance between the bottom of the screw boss and the substrate. The screw bosses can be threaded onto the dimples and can provide threads for attaching items to the substrate. A filler material can be applied to the reverse side of the substrate to fill-in the dimples and present a smooth surface. A decorative or protective layer can be applied over the filler material.