Colored Electrical Contacts With Protective Coatings and Low Resistance
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Solution Overview
Problem
Electronic devices face challenges with electrical contacts that are susceptible to corrosion, discoloration, and scratching, while also requiring high manufacturing efficiency and resource conservation, especially in visible locations.
Innovation Solution
The electrical contacts are coated with an electrophoretic deposition coating and plated with pillars to provide color, corrosion resistance, and scratch protection, using materials like copper, nickel, and rhodium, with randomized pillar placement to avoid visible patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contacts are coated with traditional protective layers, then corrosion protection is improved, but manufacturing complexity and resource consumption increase
Solution Approach 1:
The patent applies composite materials by combining multiple functional layers (electrophoretic deposition coating, metal plating layers, and protective coatings) to create a multi-layered structure that provides both corrosion protection and aesthetic appearance. This composite approach allows each layer to contribute specific properties, resolving the contradiction between protection and manufacturing complexity through systematic material integration.
Solution Approach 2:
The patent implements local quality by applying different materials and properties to different regions of the contact. The electrophoretic deposition coating provides uniform base protection, while selective metal plating (nickel, rhodium, gold) is applied to specific areas requiring enhanced corrosion resistance or aesthetic appearance. This localized application optimizes resource usage while maintaining comprehensive protection.
2Reliability
If contacts are made with precious materials for appearance, then aesthetic quality is improved, but resource consumption and cost increase
Solution Approach 1:
The patent applies precious materials (rhodium, gold) selectively only to visible contact areas rather than coating the entire contact structure. The electrophoretic deposition coating provides base aesthetic appearance, while thin layers of precious metals are applied only where visual quality is critical, dramatically reducing precious material consumption while maintaining aesthetic quality.
Solution Approach 2:
The patent uses thin, minimal layers of precious materials that provide aesthetic function without requiring thick, resource-intensive coatings. The electrophoretic deposition coating serves as a durable base layer that reduces the need for thick precious metal layers, effectively replacing expensive materials with more economical alternatives where appropriate.
3Ease of operation
If contacts are positioned in highly visible locations, then user visibility is improved, but susceptibility to corrosion and scratching increases
Solution Approach 1:
The patent employs composite protective layers including electrophoretic deposition coating, metal plating (nickel, rhodium, gold), and clear protective coatings to create a multi-layered shield. This composite structure maintains the visible appearance of contacts while providing comprehensive protection against corrosion and mechanical damage from scratching.
Solution Approach 2:
The patent applies protective coatings before the contacts are exposed to use, creating a pre-established barrier against harmful factors. The electrophoretic deposition coating and subsequent metal plating layers are applied in advance to form protective cushions that prevent direct contact between the metal and corrosive environments or mechanical damage sources.
4Reliability
If traditional plating methods are used, then corrosion protection is achieved, but manufacturing time and resource consumption increase
Solution Approach 1:
The patent applies electrophoretic deposition coating as a preliminary step before traditional metal plating. This preliminary coating creates a uniform base layer that improves subsequent plating adhesion and reduces the thickness of protective metal layers required, thereby reducing overall manufacturing time and material consumption while maintaining corrosion protection effectiveness.
Solution Approach 2:
The patent changes the physical and chemical parameters of the coating process by using electrophoretic deposition instead of traditional dip-coating or spray methods. This parameter change enables more uniform coating distribution, reduces material waste, and shortens drying and curing times, thereby improving manufacturing efficiency while maintaining protective functionality.
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 enhances the appearance and functionality of electrical contacts by providing low resistance, corrosion protection, and resource efficiency, while allowing for easy manufacturing and improved visibility.
Implementation Method 1
An electrophoretic deposition coating can be formed on a top surface of the contact substrate
Implementation Method 2
The contact can be plated with one or more layers of metal, such as nickel, rhodium, or other material
Data Source
AI summary
Methods of coating contacts to have various colors. The color can be selected to match a color of a portion of a device enclosure for an electronic device housing the contacts. Examples can instead provide methods of coating contacts to have a color to contrast with a color of a portion of the device enclosure. These methods can provide electrical contacts having a low contact resistance and good corrosion and scratch resistance.