Protective Sleeve Magnet Group Offset Magnetic Interference

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Solution Overview

Problem

Existing electronic product protective cases disrupt the magnetic field of electronic devices, affecting magnetic-sensitive components like compasses due to improper magnet and iron sheet connections.

Innovation Solution

The protective case employs a magnet group with opposite polarities in the rear housing and holder, ensuring that magnetic flux lines offset each other, minimizing the impact on the device's magnetic induction strength.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a magnet and iron sheet are used to connect the holder to the rear housing, then the holder function is achieved, but the magnetic field of the electronic product is disrupted affecting magnetic sensitive components

Engineering Contradiction:

Improveholder connection strengthVSAvoidmagnetic field disruption

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful magnetic field disruption into a beneficial offsetting effect by arranging magnets with opposite polarities. The first magnet group and second magnet group are positioned to generate magnetic fields that oppose each other, causing the magnetic flux lines to offset and neutralize the overall magnetic interference, thereby transforming the harmful effect into a beneficial cancellation effect

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent employs asymmetric polarity arrangement where the first magnet group and second magnet group have opposite polarities. This asymmetric configuration ensures that the magnetic fields generated by the two groups are directed in opposite directions, enabling the offsetting effect that minimizes overall magnetic interference with the electronic product's magnetic sensitive components

Inventive Principle:

Principle #4Asymmetry

2Ease of operation

If magnets are disposed in the holder and iron sheet in the rear housing, then the holder can be absorbed to the rear housing surface, but normal working of magnetic sensitive components is affected

Engineering Contradiction:

Improveholder attachment easeVSAvoidmagnetic sensitive component functionality

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent segments the magnetic connection system into two separate magnet groups with opposite polarities - the first magnet group in the rear housing and the second magnet group in the holder. This segmentation allows each group to contribute to both the attachment function and the magnetic field offsetting function, enabling the system to maintain reliability while ensuring ease of operation

Inventive Principle:

Principle #1Segmentation

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 arrangement reduces interference with magnetic-sensitive components, maintaining the normal functioning of electronic devices by minimizing the disturbance in the magnetic field.

Implementation Method 1

the first magnet group and the second magnet group have opposite polarities respectively, so that directions of magnetic lines of force around the first magnet group and the second magnet group are opposite; therefore, positive and negative magnetic flux in space around the first magnet group and the second magnet group offsets each other

Methodology Applied

Scientific EffectMagnetic field offsetting: Magnetic Field

Implementation Method 2

a first magnet group 32 is disposed in the rear housing 10, and a second magnet group 34 is disposed in the holder 20

Methodology Applied

Scientific EffectMagnetism: Magnetism

Implementation Method 3

The magnet is disposed in the holder, and the iron sheet is disposed in the rear housing. When the holder function is not used, the holder is absorbed to a surface of the rear housing

Methodology Applied

Scientific EffectMagnetic attraction: Magnetism

Data Source

PatentEP3248498B1Protective sleeve of electronic product

Publication Date: 2022.07.27 HUAWEI TECH CO LTD

Figure 1~2
Figure 3~4

AI summary

An electronic product protective case includes a rear housing (10) and a holder (20). The rear housing (10) is configured to cover a rear cover of an electronic product. The holder (20) is connected to the rear housing (10) and is configured to cooperate with the rear housing (10) to support the electronic product. The electronic product protective case further includes a magnet assembly (30), and the magnet assembly (30) includes a first magnet group (32) and a second magnet group (34). The first magnet group (32) is disposed in the rear housing (10). The second magnet group (34) is disposed in the holder (20). The first magnet group (32) includes a first magnet (322) and a third magnet (324) that have opposite polarities. The second magnet group (34) includes a second magnet (342) and a fourth magnet (344) that have opposite polarities. The first magnet (322) and the second magnet (342) have opposite polarities. The third magnet (324) and the fourth magnet (344) have opposite polarities. The first magnet (322) and the second magnet (342) are mutually absorbed, and the third magnet (324) and the fourth magnet (344) are mutually absorbed, so that the holder is absorbed to a surface of the rear housing. The electronic product protective case can reduce impact on work of a magnetic sensitive component in the electronic product.