Plastic Magnet Head Arm Groove for Magnetic Stability

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Solution Overview

Problem

Conventional magnetic recording apparatuses experience changes in output characteristics and read errors due to temperature fluctuations, particularly in severe environments, and face challenges in stabilizing the magnetic head's magnetization state within limited spaces without affecting other components.

Innovation Solution

Incorporating a magnetic field applying part made of a plastic magnet to stabilize the magnetization state of the magnetic head, which includes a magnetoresistive device with a free layer and shield layers, allowing for minimal magnetic interference with other components while maintaining stable output characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a magnetic field applying part is mounted within limited space to stabilize the magnetic head, then output characteristics are suppressed, but magnetic interference with other components occurs

Engineering Contradiction:

Improveoutput characteristics stabilityVSAvoidmagnetic interference

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The magnetic field applying part is designed with localized magnetic properties, using a groove structure that confines the magnetic field application to specific regions. This allows the magnetic head to be remagnetized effectively while limiting the magnetic field's influence on other components, thus resolving the contradiction between stabilizing output characteristics and preventing magnetic interference.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The groove structure acts as an intermediary element between the magnetic field applying part and other components. It directs and confines the magnetic field to where it is needed (at the magnetic head) while preventing excessive magnetic field propagation to other sensitive components, thereby reducing magnetic interference while maintaining reliability.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If conventional magnetic recording apparatus is used in severe temperature environments, then operational stability is required, but output characteristics change and read errors occur

Engineering Contradiction:

Improveoperational stabilityVSAvoidtemperature fluctuation

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The magnetic field applying part is activated to remagnetize the magnetic head before operational issues arise due to temperature fluctuations. By applying the magnetic field in advance (when the head is unloaded), the magnetic domains are realigned to their optimal state, preventing output characteristic changes and read errors that would otherwise occur during severe temperature variations.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention changes the magnetic field parameters (applying a controlled magnetic field) to counteract the effects of temperature fluctuations. By adjusting the magnetic field strength and duration, the magnetic head's magnetization state is restored to optimal conditions, compensating for temperature-induced degradation and maintaining operational stability.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If a magnetic field applying part is used to remagnetize the magnetic head, then read errors are prevented, but device complexity increases

Engineering Contradiction:

Improveread error preventionVSAvoidapparatus structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The magnetic field applying part is integrated with existing apparatus components, such as incorporating it into the load/unload mechanism or head holder structure. This merging approach allows the remagnetization function to be added without significantly increasing overall device complexity, while still effectively preventing read errors through proper magnetic field application.

Inventive Principle:

Principle #5Merging (Combining)

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 field applying part effectively suppresses changes in output characteristics and prevents read errors by remagnetizing the magnetic head, ensuring stable operations even in extreme temperature conditions without significantly affecting other components.

Implementation Method 1

a magnetic field applying part, made of a magnetic material, for applying a magnetic field to the unloaded magnetic head

Methodology Applied

Scientific EffectMagnetic field: Magnetic Field

Implementation Method 2

the magnetic material contains a plastic magnet

Methodology Applied

Scientific EffectMagnetism: Magnetism

Implementation Method 3

a magnetic head, including a magnetoresistive device, for reading information from the magnetic recording medium

Methodology Applied

Scientific EffectMagnetoresistance: Magnetoresistance

Data Source

PatentUS7474509B2Magnetic recording apparatus with head arm holding part

Publication Date: 2009.01.06 TDK CORP

AI summary

A magnetic recording apparatus comprises a magnetic disk; a magnetic head, including a magnetoresistive device, for reading information from the magnetic disk; an arm attached to the magnetic head and swings so as to load and unload the magnetic head to or from the magnetic disk; a magnetic field applying part disposed close to the magnetic disk, made of a magnetic material, and formed with a groove for surrounding the magnetic head; and a holding part for holding the arm such that the unloaded magnetic head stays at a position surrounded by the groove; whereas the magnetic material contains a plastic magnet.