Selective Electroless Plating via Catalyst Inactivator
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Solution Overview
Problem
Existing methods for forming wiring patterns on molded interconnect devices (MIDs) face challenges such as electroless plating catalyst adhesion issues on non-target areas, permeation into the base material, and increased costs due to the need for specialized resins and equipment, particularly in producing large-sized or complex parts like automotive cable harness substitutes.
Innovation Solution
A method involving the application of a catalyst inactivator to the base member, followed by light or heat irradiation to selectively retain electroless plating catalyst, allowing for the formation of a plating film only at predetermined patterns, using iodine or other substances like zinc, lead, and tin as catalyst inactivators, which suppress catalytic activity on non-target areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a laser beam is used to roughen the base member surface for electroless plating, then the wiring pattern can be formed without photoresist, but the electroless plating catalyst may strongly adhere to non-target areas and cannot be removed even by washing
Solution Approach 1:
A catalyst inactivator is introduced as an intermediary substance between the laser-irradiated base member surface and the electroless plating catalyst. This inactivator selectively deactivates the catalyst on non-target areas while allowing the catalyst to remain active on laser-irradiated areas, thus preventing unwanted plating formation and enabling precise pattern definition without requiring complete catalyst removal
Solution Approach 2:
The chemical state of the base member surface is changed by applying the catalyst inactivator, which modifies the surface properties to selectively inhibit catalyst adhesion. By controlling the chemical parameters of the surface treatment, the system achieves differential catalyst retention based on laser irradiation history, enabling precise pattern formation
2Reliability
If the electroless plating catalyst permeates into the base member, then the catalyst remains on the surface, but it becomes difficult to remove the catalyst by washing
Solution Approach 1:
The catalyst inactivator serves as a protective intermediary layer that prevents the electroless plating catalyst from permeating into the base member. By blocking the catalyst's penetration path, the inactivator ensures the catalyst remains on the surface where it can be selectively controlled and removed, eliminating the difficulty of removing permeated catalyst
3Adaptability or versatility
If specialized resins and equipment are used for LDS method, then three-dimensional circuit formed parts can be produced, but the cost increases
Solution Approach 1:
The method uses conventional base members and standard electroless plating equipment, making the process universally applicable to various base materials without requiring specialized resins or expensive equipment. The catalyst inactivator approach enables three-dimensional circuit formation on ordinary materials, achieving versatility while reducing costs
Solution Approach 2:
The catalyst inactivator is used as a consumable chemical substance that can be easily applied and removed, replacing the need for expensive specialized resins and equipment. This disposable chemical approach achieves the same functional result at lower cost, making the process economically viable for mass production
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 approach effectively prevents electroless plating film formation on non-pattern areas, allowing for cost-effective and versatile production of plated parts with precise pattern formation, suitable for various base materials and complex shapes, including transparent resins and large-sized components.
Implementation Method 1
applying a catalyst inactivator to a surface of a base member; irradiating with light or heating a part of the surface of the base member to which the catalyst inactivator is applied; allowing the surface of the base member to retain an electroless plating catalyst
Implementation Method 2
irradiating with light or heating a part of the surface of the base member to which the catalyst inactivator is applied
Implementation Method 3
irradiating with light or heating a part of the surface of the base member to which the catalyst inactivator is applied
Implementation Method 4
allowing the surface of the base member to retain an electroless plating catalyst; bringing an electroless plating solution into contact with the surface of the base member retaining the electroless plating catalyst to form an electroless plating film
Data Source
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AI summary
There is provided a method for producing a plated part (plated component) wherein the method suppresses the formation of any electroless plating film at portions other than a predetermined pattern in accordance with a simple and easy production process, and the electroless plating film can be formed at only the predetermined pattern. A method for producing a plated part (plated component) includes: applying a catalyst inactivator to a surface of a base member; irradiating with light or heating a part of the surface of the base member to which the catalyst inactivator is applied; allowing the surface of the base member to retain an electroless plating catalyst; and bringing an electroless plating solution into contact with the surface of the base member retaining the electroless plating catalyst to form an electroless plating film at a light-irradiated portion or a heated portion of the surface.