Magnetic Latch Mechanism for Laptop Display Reliability

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Solution Overview

Problem

Existing mechanical latch mechanisms in laptop computers are prone to breakage and structural issues, such as misalignment and stress-induced failure, particularly with counterbalance clutches, which affect the display's ability to lock closed and open properly.

Innovation Solution

A magnetic latch mechanism using magnetic attraction to keep the display closed and magnetic repulsion to pop-up the display, employing at least one first magnetic element in the laptop body and one second magnetic element in the display, allowing the user to easily open the laptop by switching the polarity of the magnetic elements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a mechanical hook and catch latch mechanism is used to keep the display closed, then the display can be securely locked, but the mechanism is prone to breakage and structural issues

Engineering Contradiction:
Improvelatch mechanism reliabilityVSAvoidmechanical component strength
Core Design Contradiction:
ReliabilityVSStrength

Solution Approach 1:

The patent replaces the mechanical hook and catch latch mechanism with a magnetic field-based latching system. The magnetic elements generate magnetic attraction forces to hold the display closed, eliminating the need for mechanical interlocking components that are prone to breakage. This substitution of mechanical systems with magnetic fields directly resolves the contradiction by maintaining latching reliability while removing vulnerable mechanical parts.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the fundamental operating parameter from mechanical force transmission to magnetic field interaction. By using magnetic elements with specific polarities that generate controlled magnetic attraction and repulsion forces, the system achieves reliable latching without the structural weaknesses of mechanical components. This parameter change from mechanical to magnetic domain eliminates the strength-reliability tradeoff.

Inventive Principle:
Principle #35Parameter changes

2Ease of operation

If a counterbalance clutch is used to enable the display to pop-up for opening, then the display can be easily opened, but the clutch is susceptible to stress-induced failure and damage

Engineering Contradiction:
Improvedisplay opening easeVSAvoidcounterbalance clutch reliability
Core Design Contradiction:
Ease of operationVSReliability

Solution Approach 1:

The patent replaces the mechanical counterbalance clutch with a magnetic repulsion-based pop-up mechanism. Magnetic elements positioned on the display and body generate repulsive forces that automatically pop the display open when the latching magnetic elements are disengaged. This eliminates the counterbalance clutch and its associated thrust washers, Omega clips, and bands that are susceptible to stress-induced failure, while maintaining ease of operation through magnetic force generation.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The magnetic repulsion mechanism provides a cushioning effect by gradually increasing the repulsive force as magnetic elements approach each other during the closing motion. This prevents sudden impacts and stress concentrations that would damage mechanical clutches, while still providing the necessary pop-up force for easy opening. The magnetic field acts as a protective cushion against mechanical shock.

Inventive Principle:
Principle #11Beforehand cushioning (Prior cushioning)

3Ease of operation

If mechanical latch components are exposed on the display or body after opening, then the latch can be accessed for operation, but the exposed components can be broken inadvertently

Engineering Contradiction:
Improvelatch accessibilityVSAvoidrisk of inadvertent damage
Core Design Contradiction:
Ease of operationVSObject-affected harmful factors

Solution Approach 1:

By replacing the exposed mechanical latch components with embedded magnetic elements, the patent eliminates the risk of inadvertent damage to exposed parts. The magnetic elements can be positioned within recesses or integrated into the display and body structures, making them inaccessible to users while still functioning through magnetic field interaction. This resolves the contradiction by maintaining operational accessibility through magnetic actuation while removing physically exposed vulnerable components.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

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 magnetic latch mechanism provides a robust and reliable solution that reduces the risk of breakage and misalignment, ensuring consistent operation while minimizing stress on the hinge area, allowing for easy opening and closing of the laptop display.

Implementation Method 1

uses magnetic attraction to keep the display closed

Methodology Applied
Scientific EffectMagnetic attraction: Magnetism

Implementation Method 2

uses magnetic repulsion to pop-up the display for opening

Methodology Applied
Scientific EffectMagnetic repulsion: Magnetism

Data Source

PatentUS7583500B2Electronic device having magnetic latching mechanism
Publication Date: 2009.09.01 APPLE INC
  • US7583500B2 patent drawing
  • US7583500B2 patent drawing
  • US7583500B2 patent drawing

AI summary

A magnetic latch for a display of a laptop computer is disclosed. The latch uses magnetic attraction to maintain the display closed and uses magnetic repelling forces to pop-up the display when opened. The latch includes one or more magnetic elements in the body of the laptop and at least one magnetic element in the display. When the display is closed, the magnet element in the display is positioned adjacent the magnet element in the body having an opposite polarity so that the magnet elements are attracted to one another. To pop-up the display, the user moves the magnetic element in the display so that it meets the magnetic pole in the body having the same polarity. When these meet, the repelling force between them causes the display to open slightly so that a user can then readily open the display.