Magnetic Recording Medium Protrusion Control for Stable Servo Reading
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Solution Overview
Problem
Magnetic tapes experience increased frictional forces and reduced polishing forces during repeated use, leading to errors in reading servo signals and difficulty in correcting servo positions, which can result in running speed deviations and head wear.
Innovation Solution
A magnetic recording medium with a magnetic layer containing conductive first particles and hard second particles, where protrusions formed by these particles have a specific height ratio and distribution to maintain low friction and effective polishing, incorporating a ratio (H1/H2) of average heights of 2.3 or less and individual particle counts to prevent frictional force increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic tape is used for repeated recording operations, then data storage capacity is maintained, but frictional force increases leading to servo signal reading errors
Solution Approach 1:
The invention changes the physical and chemical parameters of the magnetic tape surface by incorporating specific particles (silicon oxide, silicon carbide, boron nitride, or diamond) with controlled average particle diameters (0.01-2.0 μm) and concentration (0.1-10% by weight). These parameter changes create a surface structure that maintains consistent friction characteristics over repeated operations, preventing the frictional force increase that normally causes servo signal reading errors.
Solution Approach 2:
The invention creates a composite material structure by combining traditional magnetic tape components with abrasive particles and binding agents. This composite approach integrates the functional benefits of different materials: the magnetic particles for data storage, the abrasive particles (silicon oxide, silicon carbide, boron nitride, or diamond) for friction control, and the binding agent for structural integrity. The composite structure enables the tape to maintain stable frictional properties during repeated use while preserving recording functionality.
2Reliability
If frictional force is reduced using solid lubricant components, then servo signal reading stability is improved, but polishing force for magnetic head cleaning is reduced
Solution Approach 1:
The invention applies local quality by creating a surface layer with specific friction properties while maintaining the bulk material's polishing capability. The abrasive particles are distributed on the tape surface to provide localized friction control, while the underlying magnetic layer structure retains its polishing function. This localized approach allows different regions of the tape to perform different functions: surface particles control friction, while the overall structure maintains polishing force for magnetic head cleaning.
Solution Approach 2:
The composite material structure combines materials with complementary properties: abrasive particles (silicon oxide, silicon carbide, boron nitride, or diamond) that provide friction stability and polishing capability, binding agents that ensure proper adhesion and flexibility, and magnetic particles that maintain recording functionality. This composite approach resolves the contradiction by integrating both friction reduction and polishing force maintenance within a single multi-component system.
3Strength
If high frictional force occurs, then magnetic head cleaning effect is enhanced, but running speed stability deteriorates due to stick-slip phenomenon
Solution Approach 1:
The invention optimizes parameters by carefully controlling the average particle diameter (0.01-2.0 μm) and concentration (0.1-10% by weight) of abrasive particles. These parameter adjustments create a surface morphology that provides sufficient polishing force for magnetic head cleaning while maintaining smooth enough surface characteristics to prevent stick-slip phenomena. The binding agent content (1-50% by weight) is also optimized to ensure proper particle distribution and surface compliance, preventing running speed instability.
4Quantity of substance
If the magnetic layer thickness is reduced to increase recording density, then storage capacity is improved, but frictional force control becomes more difficult
Solution Approach 1:
The invention applies local quality by concentrating friction control functionality in the surface layer where abrasive particles are distributed, while the bulk magnetic layer can be made thinner for increased recording density. The surface treatment with abrasive particles and binding agents creates a functional layer that independently controls friction properties, allowing the underlying magnetic layer thickness to be optimized for recording density without compromising frictional force stability.
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 maintains low friction and polishing forces, reducing errors and wear, ensuring stable and reliable operation of magnetic tapes even after multiple uses.
Implementation Method 1
In accordance with running of a magnetic tape several times, a rise in a frictional force of the magnetic tape also has a likelihood of causing error in reading a servo signal
Implementation Method 2
for magnetic head cleaning, using a component having a polishing effect (in addition, an anchoring effect) (for example, particles having a high Mohs hardness, particularly, alumina or the like)
Data Source
AI summary
A magnetic recording medium is provided and including a magnetic layer containing magnetic powders, in which, the magnetic layer contains first particles having conductivity and second particles of which Mohs hardness is 7 or more, protrusions are formed on a surface of the magnetic layer side in accordance with the first particles and the second particles, a ratio (H1/H2) of an average height (H1) of protrusions formed in accordance with the first particles to an average height (H2) of protrusions formed in accordance with the second particles is 2.3 or less, and the average height (H2) of the protrusions formed in accordance with the second particles is 7 nm or less.