Selective Electroplating of Decorated Objects Using Masked Bridges
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Solution Overview
Problem
The electroplating process cannot simultaneously metalize multiple discrete regions on an object without requiring a conducting path, leading to either unattractive product designs or increased complexity and cost through mechanical attachment of pre-metalized components.
Innovation Solution
A method involving a base piece with a recess and bridges, where a second material is moulded over the base piece to form a pattern with decorating components and bridges, allowing for selective electroplating and subsequent covering to mask the bridges while keeping the components visible, using non-conductive first materials like polycarbonate and conductive second materials like ABS copolymer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple discrete regions are metalized in a single electroplating process, then productivity is improved, but the requirement for current conducting paths increases device complexity
Solution Approach 1:
The object is divided into distinct material regions: a non-conductive base piece and a conductive overmoulded portion. This segmentation allows the electroplating process to selectively deposit metal only on the conductive regions, enabling multiple discrete metalized areas without requiring complex conducting paths across the entire object.
Solution Approach 2:
Different regions of the object are given different electrical properties: the base piece remains non-conductive while the overmoulded portion is made conductive. This local differentiation in material properties enables selective electroplating, achieving multiple discrete metalized regions through a single process without adding overall device complexity.
2Adaptability or versatility
If discrete pre-metalized components are mechanically attached to the substrate, then manufacturing flexibility is improved, but reliability deteriorates due to components becoming loose
Solution Approach 1:
The conductive portion is overmoulded directly onto the base piece, creating an integrated structure where the metalized regions become an inherent part of the object rather than separate attached components. This merging eliminates the reliability issues of mechanically attached components while maintaining design flexibility through the moulding process.
Solution Approach 2:
The object combines two materials with different properties: a non-conductive base piece material and a conductive overmoulded material. This composite structure allows selective electroplating on the conductive portion while maintaining a strong, integrated bond between materials, avoiding the reliability problems of mechanical attachment.
3Reliability
If bridges connecting decorating components are visible, then electrical conductivity is improved, but aesthetics deteriorate
Solution Approach 1:
A third material layer is introduced as an intermediary between the conductive overmoulded portion and the external environment. This intermediate layer selectively masks the bridges while allowing the metalized decorating components to remain visible, thus preserving both electrical conductivity and aesthetic appearance.
Solution Approach 2:
The intermediate layer is designed with specific optical properties that make the bridges invisible while allowing the metalized components to shine through. This optical differentiation effectively hides the conductive pathways while maintaining the visual appeal of the decorated object.
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
Enables the metalization of multiple discrete regions in a single electroplating process, maintaining product aesthetics and reducing complexity and cost by hiding the bridges under a cover layer, ensuring the components appear discrete and integrated.
Implementation Method 1
depositing a layer of metal on the pattern so as to form a metalized pattern; the step of depositing a layer of metal on the pattern comprises using a selective electroplating process on the second material
Data Source
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AI summary
A method of manufacturing a decorated object is disclosed, the method comprising the steps of providing a base piece made of a first material, moulding a second material over the base piece to form a pattern, the pattern comprising a plurality of decorating components and bridges connecting the decorating components together, depositing a layer of metal on the pattern so as to form a metalized pattern, and partially covering the metalized pattern with a cover layer so as to mask the bridges but keep the decorating components visible. In an embodiment, the step of depositing a layer of metal on the pattern comprises using a selective electroplating process on the second material. In an embodiment of the invention, the first material is selected so that the layer of metal does not get deposited on first material. In an embodiment of the invention, the second material is selected to facilitate the deposition of the layer of metal onto the second material.