Magnetic Attraction-Fixing Assembly for Portable Devices

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Solution Overview

Problem

Conventional magnetic attraction-fixing assemblies for portable devices, such as tablet PCs, face challenges in providing effective radial positioning without increasing thickness and weight, as circular magnets are weak in radial attraction and require additional buckles or modifications like grooves and tenons, which add bulk.

Innovation Solution

The use of two magnetic units with an inner circular magnetic component and an outer annular magnetic component, where the polarities of adjacent planes are opposite, enhancing radial and axial attraction, and allowing for thinner designs without the need for additional buckles or structural modifications like grooves and tenons.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Force

If circular magnetic components are used for attraction, then magnetic attraction force is provided, but radial positioning capability is weak

Engineering Contradiction:

Improvemagnetic attraction forceVSAvoidradial positioning capability

Core Design Contradiction:

ForceVSReliability

Solution Approach 1:

The magnetic component is segmented into multiple magnetic units with different polarities (first magnetic unit with first polarity, second magnetic unit with second polarity opposite to the first). This segmentation creates differentiated magnetic fields that provide both attraction force and radial positioning capability, resolving the contradiction between providing attraction force and achieving reliable radial positioning.

Inventive Principle:

Principle #1Segmentation

2Reliability

If additional buckles or grooves and tenons are added to improve radial positioning, then radial positioning stability is enhanced, but thickness and weight increase

Engineering Contradiction:

Improveradial positioning stabilityVSAvoidweight of protective cover

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The patent replaces the mechanical system (buckles, grooves, and tenons) with a magnetic field-based system. The differentiated magnetic units create magnetic forces that provide radial positioning stability without requiring additional mechanical structures, thereby reducing weight and thickness while maintaining reliability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If additional buckles or grooves and tenons are added to improve radial positioning, then radial positioning stability is enhanced, but device complexity increases

Engineering Contradiction:

Improveradial positioning stabilityVSAvoidstructural complexity of protective cover

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent substitutes complex mechanical structures (buckles, grooves, tenons) with a simplified magnetic field system. The differentiated magnetic units inherently provide radial positioning stability through magnetic force distribution, eliminating the need for additional mechanical components and reducing overall device complexity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Force

If conventional circular magnets are used, then magnetic attraction is achieved, but lateral attraction is weak

Engineering Contradiction:

Improvemagnetic attractionVSAvoidlateral attraction strength

Core Design Contradiction:

ForceVSStrength

Solution Approach 1:

The magnetic component is divided into multiple segmented magnetic units with alternating polarities arranged in a specific pattern. This segmentation creates multiple magnetic interaction points that collectively provide strong lateral attraction force, resolving the contradiction between achieving magnetic attraction and providing sufficient lateral strength.

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 configuration provides stronger radial positioning and attraction, reducing the thickness and weight of the assembly while maintaining stability, allowing for easier detachment and reattachment of portable devices, and enabling multiple stable rotational positions.

Implementation Method 1

the polarities of the adjacent magnetic components are opposite to each other

Methodology Applied

Scientific EffectMagnetic attraction: Magnetism

Implementation Method 2

the first circular magnetic component 811 attracts the second circular magnetic component 91

Methodology Applied

Scientific EffectMagnetic field interaction: Magnetic Field

Data Source

PatentUS9799436B2Magnetic attraction-fixing assembly, two-piece apparatus, and rotating support structure for a portable device having the magnetic attraction-fixing assembly

Publication Date: 2017.10.24 LEE BING ZHANG

AI summary

A magnetic attraction-fixing assembly and a rotating support structure for a portable device are provided. The magnetic attraction-fixing assembly includes two magnetic units, the two magnetic units stacked with and attracting each other; wherein each of the magnetic units respectively comprises a circular magnetic component and at least one annular magnetic component around the circular magnetic component, a magnetic pole of the circular plane of the circular magnetic component is an unlike pole to a magnetic pole of an annular plane of the annular magnetic component that is adjacent to the circular magnetic component. The rotating support structure comprises two magnetic units and a body. Magnetic attractions in both radial and axial directions are enhanced.