Polycarbonate Timepiece Dial Coating for Adhesion and RF Transparency
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Solution Overview
Problem
Timepiece dials face challenges in achieving both excellent readability and appearance while maintaining durability, particularly due to poor adhesion between plastic and metal coatings, which affects their durability and electromagnetic wave transparency.
Innovation Solution
A timepiece dial design featuring a polycarbonate base with a silicon oxide compound layer and a zinc sulfide compound layer, optimized for thickness and refractive index differences to enhance adhesion and transparency, along with a polarizer, color layer, and diffusion layer for improved appearance and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a metal film is coated on a plastic base to improve appearance, then aesthetic appeal is improved, but adhesion is poor and durability deteriorates
Solution Approach 1:
The patent applies composite materials by creating a multi-layer structure consisting of a plastic base layer, an intermediate adhesion promotion layer, and a metal film layer. This composite structure resolves the adhesion problem between plastic and metal while maintaining the aesthetic appearance of the metal coating.
Solution Approach 2:
The patent introduces an intermediate adhesion promotion layer between the plastic base and the metal film. This intermediary layer acts as a mediator that improves bonding between the two materials, preventing coating separation and enhancing durability while allowing the metal film to maintain its aesthetic function.
2Shape
If a metal film is coated on a plastic base to improve appearance, then aesthetic appeal is improved, but electromagnetic wave transmission deteriorates
Solution Approach 1:
The patent applies parameter changes by controlling the thickness of the metal film to be in the range of 10-100 nm. This thin film thickness allows sufficient electromagnetic wave transmission for radio-controlled and solar-powered timepiece functions while maintaining the aesthetic appearance and adhesion benefits of the metal coating.
Solution Approach 2:
The multi-layer composite structure enables the metal film to be extremely thin while the intermediate layer provides the necessary adhesion. This composite approach allows the system to achieve both aesthetic appearance and electromagnetic wave transmission requirements simultaneously.
3Use of energy by moving object
If plastic is used for the timepiece dial to ensure electromagnetic wave transparency, then radio wave and light transmission is improved, but adhesion between plastic and metal coating is poor
Solution Approach 1:
The patent introduces an intermediate adhesion promotion layer between the plastic base and the metal film. This intermediary layer acts as a mediator that improves bonding between the two materials, preventing coating separation and enhancing durability while allowing the metal film to maintain its aesthetic function.
Solution Approach 2:
The patent applies composite materials by creating a multi-layer structure consisting of a plastic base layer, an intermediate adhesion promotion layer, and a metal film layer. This composite structure resolves the adhesion problem between plastic and metal while maintaining the aesthetic appearance of the metal coating.
4Use of energy by moving object
If the metal film is made thin to improve electromagnetic wave transmission, then radio wave and light transmission is improved, but appearance quality deteriorates
Solution Approach 1:
The patent applies parameter changes by controlling the thickness of the metal film to be in the range of 10-100 nm. This thin film thickness allows sufficient electromagnetic wave transmission for radio-controlled and solar-powered timepiece functions while maintaining the aesthetic appearance and adhesion benefits of the metal coating.
Solution Approach 2:
The multi-layer composite structure enables the metal film to be extremely thin while the intermediate layer provides the necessary adhesion. This composite approach allows the system to achieve both aesthetic appearance and electromagnetic wave transmission requirements simultaneously.
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 design achieves high transparency to electromagnetic waves and light, an attractive appearance, and enhanced durability, making it suitable for radio-controlled and solar-powered timepieces.
Implementation Method 1
a silicon compound layer made primarily of a silicon oxide compound, and a zinc sulfide compound layer made primarily of a zinc sulfide compound
Implementation Method 2
optimized for thickness and refractive indices
Implementation Method 3
a polarizer, color layer, and diffusion layer for enhanced transparency
Data Source
AI summary
A timepiece dial having a base member made primarily of polycarbonate, a silicon compound layer made primarily of a silicon oxide compound, and a zinc sulfide compound layer made primarily of a zinc sulfide compound and rendered on the opposite side of the silicon compound layer as the side facing the base member.