Magnetic Preload Mechanism for Tape Head Guide Bearings
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Solution Overview
Problem
Tape head positioning mechanisms face reliability and performance issues due to component fatigue and unpredictable frictional forces in preload components, and struggle with stray magnetic fields that interfere with data read/write operations, especially in space-constrained environments.
Innovation Solution
A preload mechanism using a magnet and a steel member to apply a selective magnetic force to guide bearings, while generating a shielding magnetic field orthogonal to the path of travel to cancel stray fields without interfering with read/write operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If compression or leaf springs are used to preload guide bearings, then bearing preload is achieved, but reliability deteriorates due to component fatigue, wear, and unpredictable frictional forces
Solution Approach 1:
The patent replaces mechanical spring-based preload systems with a magnetic field-based system. Magnets mounted on the carriage interact with a magnetic track on the guide rail to provide consistent bearing preload without mechanical contact, eliminating fatigue, wear, and friction variability associated with compression or leaf springs.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the carriage and guide rail. Instead of direct mechanical contact through springs, the magnetic field acts as a mediator to transfer force for bearing preload, providing more reliable and repeatable performance.
2Object-affected harmful factors
If high permeability materials are placed between recording heads and voice coil motors to shield from stray magnetic fields, then stray field suppression is improved, but device complexity and mass increase
Solution Approach 1:
The patent makes the magnetic track serve multiple functions: it provides the magnetic field for bearing preload and simultaneously acts as a shield against stray magnetic fields from the voice coil motor. This eliminates the need for separate high permeability shielding materials, reducing device complexity and mass.
Solution Approach 2:
The patent combines the bearing preload mechanism and stray field shielding into a single integrated system. The magnetic track and magnets perform both functions concurrently, merging what were previously separate components into one unified solution.
3Force
If traditional spring-based preload mechanisms are used, then bearing preload can be applied, but manufacturing precision deteriorates due to unpredictable frictional forces at preload component interfaces
Solution Approach 1:
The patent replaces mechanical spring-based preload with a magnetic field-based system that provides consistent, predictable forces. The magnetic interaction between magnets and the magnetic track eliminates variable frictional forces at mechanical interfaces, improving assembly-to-assembly performance repeatability.
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 solution effectively preloads guide bearings to minimize out-of-plane movements and suppresses stray magnetic fields, enhancing the reliability and performance of tape head positioning mechanisms while maintaining data integrity and operating within space and mass constraints.
Implementation Method 1
a magnet and a steel member to apply a selective magnetic force to guide bearings
Implementation Method 2
generating a shielding magnetic field orthogonal to the path of travel to cancel stray fields
Data Source
AI summary
Apparatus is provided for a tape head actuator having a guide bearing preload mechanism, wherein the preload mechanism utilizes a magnet or magnets and an elongated steel member. These magnetic components interact to produce a force that is selectively directed to preload the guide bearings. In addition, the magnetic components produce a field used to shield the tape head from stray magnetic fields. In a useful embodiment of the invention, directed to apparatus for a tape transducer positioning mechanism, a carriage is disposed for movement along a path of travel relative to a support structure, to selectively position a tape transducer. One or more bearings are joined to the carriage, to support the carriage for movement along the path of travel. The apparatus further includes a first magnetic component joined to the support structure, and a second component joined to the carriage for cooperatively interacting with the first component, in order to produce a magnetic force that is transferred through the carriage to apply a preload force to each of the bearings.