Magnetic Recording Device Triangular Wave Current Stabilization
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Solution Overview
Problem
Current magnetic recording devices face challenges in increasing recording density due to fluctuations in the recording magnetic field, leading to jitter and instability, which affect on-track performance and recording density.
Innovation Solution
Incorporating a direct current (Idc) supplied by a first electrical circuit to the magnetic pole, conductive member, and first shield, along with a second electrical circuit to supply a recording current to a coil, ensuring the recording magnetic field corresponds to the recording current, with a rise time of the recording current not less than 65% of the shortest bit length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the recording current is increased to improve recording density, then the recording magnetic field strength is improved, but the jitter and fluctuations in the recording magnetic field increase, leading to instability
Solution Approach 1:
The patent applies periodic action by using a triangular wave recording current with a specifically controlled rise time that corresponds to the bit length. This periodic waveform ensures that the magnetic field transitions occur at precise intervals matching the data bit duration, thereby stabilizing the recording magnetic field while maintaining high recording density. The rise time of the triangular wave is set to match the bit length, preventing jitter and fluctuations.
Solution Approach 2:
The patent changes the parameter of recording current waveform from conventional forms to a triangular wave with a specific rise time parameter. By setting the rise time of the triangular wave to correspond to the bit length (specifically, the rise time is set to 65% or more of the bit length), the patent optimizes the magnetic field transition characteristics. This parameter change stabilizes the recording magnetic field while enabling higher recording density without increasing jitter.
2Productivity
If the rise time of recording current is shortened to increase recording speed, then the productivity is improved, but the magnetic field transitions become abrupt causing fluctuations and jitter
Solution Approach 1:
The triangular wave recording current provides controlled periodic transitions that match the bit length timing. The rise time of the triangular wave is specifically set to 65% or more of the bit length, ensuring that magnetic field transitions occur at the correct periodic intervals without abrupt changes. This maintains recording speed while preventing jitter and fluctuations through synchronized periodic action.
Solution Approach 2:
The patent optimizes the rise time parameter of the recording current waveform by setting it to 65% or more of the bit length. This parameter change balances recording speed with magnetic field stability - the rise time is sufficiently short to maintain high recording speed but sufficiently long to prevent abrupt magnetic field transitions that cause jitter. The triangular wave shape with this specific rise time parameter achieves both goals simultaneously.
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 configuration stabilizes the recording magnetic field, reduces jitter, improves on-track performance, and increases recording density by suppressing fluctuations and enhancing the rise time of the recording magnetic field, allowing for higher frequency recording and improved write operations.
Implementation Method 1
a second electrical circuit configured to supply a recording current to the coil. A recording magnetic field is generated from the magnetic pole. The recording magnetic field corresponds to the recording current.
Implementation Method 2
a magnetic head including a magnetic pole, a first shield, a conductive member electrically connecting the magnetic pole and the first shield and being provided between the magnetic pole and the first shield, and a coil
Data Source
AI summary
According to one embodiment, a magnetic recording device includes a magnetic head, a first electrical circuit, and a second electrical circuit. The magnetic head includes a magnetic pole, a first shield, a conductive member electrically connecting the magnetic pole and the first shield and being provided between the magnetic pole and the first shield, and a coil. The first electrical circuit is configured to supply a first current to the magnetic pole, the conductive member, and the first shield. The second electrical circuit is configured to supply a recording current to the coil. A recording magnetic field is generated from the magnetic pole. The recording magnetic field corresponds to the recording current. A rise time of the recording current is not less than 65% of a shortest bit length.