Magnetic Tape Recording Head Intermittent Current Control
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Solution Overview
Problem
Conventional magnetic tape recording apparatuses face issues with high power consumption, increased load on head and circuit components, and crosstalk noise due to continuous current flow during data recording, which complicates the circuit structure and increases costs, making miniaturization difficult.
Innovation Solution
A data recording apparatus that uses a head to magnetize a magnetic layer intermittently with a recording current in an opposite direction to direct current demagnetization, reducing the overall current flow to approximately half, thereby controlling magnetic field generation and simplifying the circuit structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous recording current flows to the head to magnetize the magnetic tape in alternating directions, then data signals can be recorded on the magnetic tape, but power consumption increases
Solution Approach 1:
The patent applies periodic action by switching the recording current direction periodically rather than continuously. The recording current flows in the first direction during a first period, then switches to the second direction during a second period, creating periodic magnetization alternation. This periodic current switching enables data recording while reducing average power consumption compared to continuous current flow.
Solution Approach 2:
The patent implements dynamics by making the recording current characteristics variable rather than constant. The current magnitude and direction are dynamically adjusted based on the recording phase - using full current amplitude during magnetization transitions and reducing or stopping current during stable magnetization periods. This dynamic control reduces overall power consumption while maintaining recording functionality.
2Productivity
If continuous recording current flows to the head, then data recording operation is maintained, but load on head and circuit components increases
Solution Approach 1:
By implementing periodic current switching, the patent reduces the cumulative load on head and circuit components compared to continuous operation. The periodic nature of current flow allows components to experience intermittent stress rather than continuous stress, thereby extending component life span while maintaining continuous recording capability through repeated cycles of magnetization and demagnetization.
Solution Approach 2:
The dynamic adjustment of recording current characteristics allows the system to optimize between recording speed and component stress. During periods when data recording is prioritized, higher current may be applied; during periods when component protection is prioritized, current is reduced or interrupted. This dynamic balancing act extends component life span while maintaining operational reliability.
3Manufacturing precision
If recording current increases to improve magnetization strength, then data recording quality improves, but crosstalk noise to read head increases
Solution Approach 1:
The periodic switching of recording current direction creates alternating magnetization patterns that are confined to specific temporal windows. By synchronizing the magnetization process with the recording clock and using periodic current pulses rather than continuous current, the patent confines magnetic field effects to specific time intervals, reducing overlap and interference with the read head and thereby minimizing crosstalk noise.
Solution Approach 2:
The patent applies local quality by concentrating the magnetization effect in specific spatial and temporal regions. The recording current is applied locally to the write head, and the resulting magnetic field is confined to the immediate vicinity of the magnetic tape during the brief pulse duration. This localized approach prevents magnetic field leakage to distant components like the read head, reducing crosstalk noise while maintaining sufficient magnetization strength for data recording.
4Adaptability or versatility
If complex circuit structure is used to control recording current directions, then recording functionality is achieved, but apparatus size and cost increase
Solution Approach 1:
The patent applies universality by designing a recording control circuit that can handle multiple current direction requirements through a single integrated control mechanism. Rather than using separate circuits for each current direction control, the patent uses a unified control approach that generates appropriate current waveforms for both first and second direction magnetization, reducing overall circuit complexity while maintaining full recording functionality.
Solution Approach 2:
The patent merges the control functions for different recording phases into a single integrated control circuit. The control circuit combines current magnitude control, direction switching, and timing synchronization functions into one unified module, reducing the number of separate components and simplifying the overall circuit structure while maintaining the adaptability needed for bidirectional magnetization recording.
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 reduces power consumption, decreases load on head and circuit components, minimizes crosstalk noise, and enables miniaturization and cost reduction while maintaining data recording quality for high-density data storage.
Implementation Method 1
a head (1) that records data signals by magnetizing a magnetic layer (105) of a magnetic recording medium (100)
Implementation Method 2
magnetizing the magnetic layer (105) of a magnetic recording medium (100) in a first magnetization direction or a second magnetization direction
Data Source
AI summary
A data recording apparatus of the present invention includes a head that records data signals by magnetizing a magnetic tape 10 and a recording control portion that controls the recording operation by causing recording current to flow to the head. The recording control portion controls the operation of the head, so that in the magnetic tape 10, which is direct current demagnetized continuously in the longitudinal direction, a magnetic field is formed intermittently in an opposite direction to the magnetization direction of the direct current demagnetization. Thus, when recording data signals on the magnetic recording medium, it is possible to make the current flowing to the head small and to realize apparatus power consumption reductions, load reductions for the head and circuitry, and reduction in crosstalk noise from the head chip used for writing to the head chip used for reading.