Thermally Assisted Servo Writing for Magnetic Recording Heads
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Solution Overview
Problem
Existing magnetic recording devices face challenges in improving productivity due to issues with accurately recording servo position information, leading to potential errors that require corrective actions.
Innovation Solution
A magnetic recording device and method that includes a magnetic head with a light emitting section to locally increase the temperature of the recording medium, allowing for a controller to perform a first operation to record servo position information and a second operation to correct errors by erasing and re-recording if necessary, ensuring the recording conditions are within specified ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If servo position information is recorded using conventional magnetic recording methods, then the recording process is simple, but recording accuracy is insufficient leading to errors
Solution Approach 1:
The patent combines the magnetic recording function with a light emitting section (laser) into a single magnetic head assembly. This merging allows the device to perform both magnetic field application and localized heating functions, enabling thermally assisted magnetic recording that improves servo position information recording accuracy while maintaining integration.
Solution Approach 2:
The patent changes the physical state of the magnetic recording medium by locally increasing temperature through light emission. This parameter change (temperature elevation) modifies the magnetic properties of the medium, allowing for more accurate recording of servo position information that cannot be achieved with conventional magnetic recording alone.
2Reliability
If conventional magnetic recording is used without temperature control, then the device operation is simple, but recording reliability is insufficient
Solution Approach 1:
The patent implements a feedback control system where the controller monitors recording conditions and adjusts the light emitting section's operation accordingly. The controller determines whether to activate the light emitting section based on recorded position information, creating a closed-loop system that improves reliability while automating the complexity of temperature control.
Solution Approach 2:
The system performs self-correction by automatically detecting recording errors in servo position information and triggering re-recording operations when necessary. The controller autonomously determines when re-recording is needed and executes the correction without external intervention, maintaining ease of operation while improving reliability.
3Productivity
If errors in servo position information are not corrected, then the processing time is short, but productivity is reduced due to quality issues
Solution Approach 1:
The patent performs preliminary verification of recording quality by checking servo position information immediately after recording. By detecting errors early and correcting them promptly through the light emitting section, the system prevents defective products from proceeding further, improving overall productivity despite the additional verification step.
Solution Approach 2:
The controller rapidly determines whether re-recording is necessary by evaluating recording conditions against predetermined criteria. When recording is determined to be successful, the system skips unnecessary correction operations, minimizing time loss while ensuring quality when needed.
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 approach enhances the reliability and efficiency of servo position information recording, thereby improving the overall productivity of the magnetic recording device.
Implementation Method 1
a light emitting section configured to irradiate the magnetic recording medium with a light to locally increase a temperature of the magnetic recording medium
Implementation Method 2
a first magnetic pole configured to generate a magnetic field according to a recording current supplied to the coil
Data Source
AI summary
According to one embodiment, a magnetic recording device includes a magnetic recording medium, a magnetic head configured to record information on the magnetic recording medium, and a controller configured to control the magnetic recording medium and the magnetic head. The magnetic head includes a coil, a first magnetic pole configured to generate a magnetic field according to a recording current supplied to the coil, and a light emitting section configured to irradiate the magnetic recording medium with a light to locally increase a temperature of the magnetic recording medium. The controller is configured to perform a first operation and a second operation. In the first operation, the controller is configured to record a first servo position information in a first region of the magnetic recording medium. In the second operation, the controller is configured to perform a repair operation if a first condition is not satisfied.