Watch Case Coil Support Structure for Stable Wireless Charging
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Solution Overview
Problem
Smartwatches with wireless charging structures face issues such as coil deformation, poor appearance, and reduced charging efficiency due to coil misalignment and structural instability, which affect yield rates and overall performance.
Innovation Solution
A watch case design incorporating a magnetic conductive sheet with an extended boundary around the coil, supported by a support portion and adhesive layers, along with bonding portions to enhance structural stability and prevent coil misalignment, ensuring efficient wireless charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the magnetic conductive sheet is extended beyond the coil boundary to improve magnetic field shielding, then charging efficiency is improved, but structural stability deteriorates due to the unsupported extended area
Solution Approach 1:
A support portion is introduced as an intermediary element between the extended magnetic conductive sheet and the groove structure. This support portion provides mechanical reinforcement to the extended area that would otherwise be unsupported, preventing structural instability while allowing the magnetic conductive sheet to extend beyond the coil boundary for improved magnetic field shielding and charging efficiency.
2Loss of energy
If the coil is tightly constrained to prevent misalignment, then charging efficiency is improved, but manufacturing precision deteriorates due to deformation risks
Solution Approach 1:
The support portion is positioned specifically at the critical area where the magnetic conductive sheet extends beyond the coil boundary, providing localized reinforcement only where needed. This localized support prevents coil misalignment and maintains charging efficiency without over-constraining the entire structure, thereby avoiding deformation risks and maintaining manufacturing precision.
3Ease of manufacture
If the watch case structure is simplified to reduce manufacturing complexity, then ease of manufacture is improved, but reliability deteriorates due to coil deformation and appearance defects
Solution Approach 1:
The support portion is integrated with the existing groove structure of the watch case, merging two functional elements into a unified design. This integration provides the necessary structural support to prevent coil deformation and appearance defects while maintaining relatively simple manufacturing processes, thus improving reliability without significantly increasing manufacturing complexity.
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 improves magnetic field shielding, prevents coil deformation, maintains charging efficiency, and enhances product yield by stabilizing the coil's position and reducing appearance defects.
Implementation Method 1
improving a shielding effect of the magnetic conductive sheet on a magnetic field of the coil
Implementation Method 2
The coil is bonded to the magnetic conductive sheet through the first adhesive layer
Data Source
AI summary
A watch case, including a first connecting member which is provided with an annular groove and connected to a second connecting member, a magnetic conductive sheet, a coil, and a support portion, wherein at least a part of the second connecting member covers an opening of the groove; the magnetic conductive sheet; the coil is disposed in an annular manner and disposed on a side that is of the magnetic conductive sheet and that is away from the bottom of the groove, an inner boundary of the magnetic conductive sheet exceeds an inner boundary of the coil, and a part that is of the magnetic conductive sheet and that exceeds the inner boundary of the coil is a first component portion; and the support portion is disposed in an annular manner and disposed between the first component portion and the second connecting member.