Magnetic disc substrate and a magnetic disc using the same
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United States of America Patent
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Dec 17, 1996
Grant Date -
N/A
app pub date -
Nov 23, 1994
filing date -
Nov 30, 1993
priority date (Note) -
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Abstract
Using a thermoplastic norbornene type plastic as a material for the magnetic disc substrate, a magnetic disc substrate having a small deformation and a high modulus of elasticity is prepared. By optimizing the thickness of the substrate, the resonance frequency of the magnetic disc can be elevated to a level higher than the servo band. As a result, a magnetic disc substrate can form a servo mark having a high positional precision, and can carry out tracking with high precision.
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