Watch Dial with Conductive Periphery for Static Discharge
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Solution Overview
Problem
Existing wristwatches face challenges in managing static electricity discharge, which can damage internal circuits, and the inclusion of coil springs for static electricity dissipation increases the watch's size, making it unsuitable for individuals with thin arms and complicates the design of multi-functional watches.
Innovation Solution
A watch design where the dial features a non-conductive central portion and a conductive outer peripheral portion, with the case and case back electrically coupled to the outer peripheral portion, allowing static electricity to discharge through the case without the need for internal coil springs, thereby reducing the watch's size and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coil spring is installed inside the case to electrically couple the dial and case back for static electricity dissipation, then static electricity resistance is improved, but the volume occupied inside the case increases
Solution Approach 1:
The patent extracts the coil spring from the interior of the case and relocates it to the exterior, specifically attaching it to the case back. This removes the volume occupation from inside the case while maintaining the electrical coupling function for static electricity dissipation between the dial and case back
Solution Approach 2:
The patent moves the coil spring from a three-dimensional space inside the case to a two-dimensional plane on the exterior surface of the case back. This dimensional transition eliminates the need for internal volume while preserving the electrical connection path for static electricity discharge
2Ease of operation
If the case is made smaller to accommodate thin arms, then wearability is improved, but the volume for static electricity dissipation components is reduced
Solution Approach 1:
By extracting the coil spring from the case interior and placing it externally on the case back, the patent eliminates the volume requirement inside the case. This enables the case to be made smaller for better wearability on thin arms while the static electricity dissipation function is maintained by the externally positioned coil spring
3Adaptability or versatility
If a multi-functional wristwatch is designed with many internal parts, then functionality is improved, but the case size increases making it difficult to wear
Solution Approach 1:
The patent extracts the coil spring from the limited internal space of the case and positions it externally. This frees up internal volume that can then be utilized for accommodating multiple functional components, enabling multi-functionality without increasing case size
Solution Approach 2:
The coil spring serves dual functions: it provides mechanical coupling between the dial and case back, and simultaneously serves as an electrical conductor for static electricity dissipation. This multi-functionality reduces the need for separate components, allowing more space for additional watch functions
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 effectively dissipates static electricity without occupying additional space within the watch, enabling smaller and more functional designs while protecting internal circuits from damage.
Implementation Method 1
a case electrically coupled to the outer peripheral portion and electrically coupled to a case back. In the watch, static electricity entering the dial passes through the case electrically coupled to the outer peripheral portion of the dial, and flows to the case back.
Data Source
AI summary
A watch includes a dial including, in plan view, a central portion having a non-conductive surface, and an outer peripheral portion provided at an outer periphery of the central portion and having a conductive surface, and a case electrically coupled to the outer peripheral portion and electrically coupled to a case back.