Wristwatch Back Cover Insulation via Welding Layer
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Solution Overview
Problem
In wristwatch designs, conductive bases can electrically connect with charging terminals, rendering them ineffective for charging functions due to electrical conductivity, which hampers slimming down and weight saving efforts.
Innovation Solution
A timepiece component comprising a conductive circumferential rim base and an insulative center base with a welding layer, where the center base is made of insulative first resin and the circumferential rim base of conductive second resin, preventing electrical connection between the back cover and charging terminals while ensuring airtightness and waterproofness through integral two-color molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a conductive base is used to achieve slimming down and weight saving, then the weight is reduced, but the charging terminal becomes electrically connected to the base, rendering the charging function ineffective
Solution Approach 1:
The base is divided into two separate components: a conductive circumferential rim base and an insulative center base. This segmentation allows the base to maintain both conductivity for structural integrity and insularity to preserve charging functionality, resolving the contradiction between weight reduction and charging reliability.
Solution Approach 2:
Different regions of the base are assigned different material properties: the circumferential rim uses conductive material for structural strength, while the center portion uses insulative material to prevent electrical connection with charging terminals. This local differentiation allows simultaneous achievement of weight saving and functional reliability.
2Reliability
If the center base and circumferential rim base are separately made of different materials, then electrical insulation is achieved, but the structural integrity and waterproofing may be compromised
Solution Approach 1:
The insulative center base and conductive circumferential rim base are integrated into a single unified structure through co-molding, creating a composite base assembly that maintains both electrical insulation and structural integrity as a single waterproof unit.
Solution Approach 2:
The base assembly uses composite construction with an insulative resin center portion and conductive resin rim portion bonded together, creating a multi-material structure that simultaneously provides electrical insulation and structural strength while maintaining waterproofing.
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 configuration prevents electrical connection between the back cover and charging terminals, ensuring insulation, achieving slimming down and weight saving while maintaining the structural integrity and waterproof performance of the wristwatch.
Implementation Method 1
the center base and the circumferential rim base have a welding layer therebetween
Data Source
AI summary
A timepiece component of the present disclosure includes a back cover which is a circumferential rim base that is provided with an attachment hole and attached to a wristwatch case, a terminal attachment member which is arranged in and attached to the attachment hole of the back cover, and charging terminals which are provided in the terminal attachment member and exposed therefrom. The terminal attachment member is made of insulative first resin, the back cover is made of conductive second resin, and a welding layer lies between the terminal attachment member and the back cover. As a result, the circumferential rim base and each terminal are prevented from being electrically connected to each other.