Screen Connection Arrangement Using Casting Compound
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Solution Overview
Problem
Existing connection arrangements for electrically conductive contacts on vehicle screens, particularly those using lead-free solders or conductive adhesives, often result in screen damage due to mechanical stress, thermal influences, or poor adhesion, and fail to provide a strong and durable connection.
Innovation Solution
A connection arrangement where an electrically conductive compound connects the coupling element and electrical conductor, with the contact point partially or fully surrounded by a casting compound, which also adheres to the screen, forming a resilient and durable bond that withstands mechanical and thermal stresses, using curable adhesives like polyurethane or epoxy resin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If lead-free solder is used to avoid screen damage, then environmental compliance is improved, but connection strength and reliability deteriorate due to glass breakages and ceramic breakages
Solution Approach 1:
The patent introduces a casting compound as an intermediary material between the solder joint and the screen. This casting compound surrounds and protects the contact point, distributing mechanical stresses away from the screen while maintaining the electrical connection. The intermediary layer prevents direct stress transfer that causes screen damage, thus resolving the contradiction between using lead-free solder and maintaining connection reliability.
Solution Approach 2:
The patent employs a composite structure consisting of the solder joint embedded within the casting compound matrix. This composite arrangement combines the electrical conductivity of the solder with the mechanical protection and stress distribution properties of the casting compound, achieving both screen protection and reliable electrical connection simultaneously.
2Reliability
If electrically conductive adhesive with high copper or silver content is used to improve conductivity, then electrical conductivity is improved, but mechanical strength deteriorates
Solution Approach 1:
The patent creates a composite connection structure where the electrically conductive adhesive (with high copper or silver content) is embedded within the casting compound matrix. The casting compound provides the primary mechanical strength and structural support, while the conductive adhesive ensures electrical conductivity. This composite approach allows both high conductivity and high mechanical strength to coexist without compromising either property.
3Strength
If the contact point is completely encased by casting compound to withstand high mechanical stresses, then connection strength is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges multiple functions into the single casting compound material: it provides mechanical protection, distributes stresses, ensures electrical insulation where needed, and facilitates thermal management. By combining these functions into one material system, the patent achieves high connection strength without significantly increasing manufacturing complexity, as the casting process can be integrated into existing production workflows.
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 solution creates a strong, durable, and resilient connection that resists peeling forces and cyclic stresses while maintaining electrical contact, ensuring the connection's longevity and preventing screen damage, even with toughened or laminated glass.
Implementation Method 1
the casting compound surrounding the at least one contact point touches the screen... the surface of the screen forms an adhesive surface for the casting compound
Implementation Method 2
the casting compound is formed from an adhesive, preferably from a curable adhesive... The casting compound initially has a substantially fluid or viscous consistency such that at least the contact point can be overmoulded by the casting compound. As a result, it can be ensured that the contact point is completely encased or surrounded by the casting compound. By curing the adhesive, a high-strength connection between the coupling element, the electrical conductor and the screen is subsequently formed
Data Source
AI summary
The invention relates to a connection arrangement for an electrically conductive contact between at least one electrical conductor (17) provided on a screen (16), in particular for a motor vehicle, and an electrical coupling element (18), wherein at least one contact point (20) between the coupling element (18) and the electrical conductor (17) is provided on a coupling point (15) for the at least one electrical conductor (17) and wherein the electrical coupling element (18) and the electrical conductor (17) are connected to each other by means of an electrically conductive compound (19), and wherein the at least one contact point (20) of the coupling point (15) is at least partially surrounded by a casting compound (24), and a method for producing such a connection arrangement (10).