Magnetic Head Oscillation Frequency Evaluation via AC Field
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Solution Overview
Problem
Existing methods for evaluating the oscillation frequency of a magnetic head are inefficient and lack accuracy due to the weak high-frequency signals generated, making it difficult to stably measure the oscillation frequency with high precision.
Innovation Solution
A method and apparatus that apply an alternating-current magnetic field to a magnetic head with a current path including an oscillator, measuring electrical characteristics to derive the oscillation frequency, utilizing synchronous and asynchronous states to achieve accurate frequency measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional measurement methods are used to evaluate oscillation frequency, then the measurement process is simple, but the measurement precision is low due to weak high-frequency signals
Solution Approach 1:
The patent introduces an intermediary alternating-current magnetic field as a mediator to couple with the oscillator in the magnetic head. This external magnetic field acts as a mediator that transfers energy to the oscillator, enabling stable oscillation and accurate frequency measurement through electrical characteristic changes, thereby resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
The patent applies periodic alternating-current magnetic fields at specific frequencies (first frequency and second frequency) to the magnetic head. This periodic action causes the oscillator to resonate and produces detectable electrical characteristic changes, enabling precise frequency measurement without requiring complex measurement equipment
2Reliability
If conventional evaluation methods are used, then the evaluation process is quick, but the reliability of oscillation frequency evaluation is low
Solution Approach 1:
The patent employs feedback by measuring electrical characteristics (impedance, admittance, or S-parameters) of the current path and comparing them at different alternating-current frequencies. The oscillator's resonant frequency is identified through feedback from these measurements, ensuring reliable evaluation while maintaining efficient measurement time
Solution Approach 2:
The patent performs preliminary measurements at two different frequencies (first and second frequencies) to establish baseline electrical characteristics. This preliminary action enables accurate determination of the oscillator's resonant frequency by comparing how the electrical characteristics change with frequency, improving reliability without significant time loss
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 method allows for stable and accurate evaluation of the oscillation frequency of the magnetic head, enhancing the precision and practicality of the evaluation process.
Implementation Method 1
measuring an electrical characteristic of a current path when an alternating-current magnetic field is applied to the magnetic head
Data Source
AI summary
According to one embodiment, a method for evaluating a magnetic head is disclosed. The method can include measuring an electrical characteristic of a current path when an alternating-current magnetic field is applied to the magnetic head. The magnetic head includes the current path. The current path includes an oscillator. The method can include, based on the electrical characteristic, deriving a frequency value relating to an oscillation frequency of the oscillator.