Magnetic disc substrate and a magnetic disc using the same

Details Magnetic disc substrate and a magnetic disc using the same Magnetic disc substrate and a magnetic disc using the same

1994-11-23

1996-12-17

Wolff, John H.

Dynamic magnetic information storage or retrieval

Record medium

Disk

360137, G11B 582

Patent

active

055859895

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.

REFERENCES:
patent: 4738885 (1988-04-01), Matsumoto
patent: 5247612 (1993-12-01), Sato et al.
patent: 5296995 (1994-03-01), Yonezawa et al.
patent: 5302656 (1994-04-01), Kohara et al.
patent: 5379171 (1995-01-01), Morehouse et al.
patent: 5393584 (1995-02-01), Satoh et al.
patent: 5402278 (1995-03-01), Morita
Derwent Publications, Ltd., London, GB, No. AN 85-071721 (Database WPI, Week 8512) and JP-A-60 026 024 (Nippon Zeon Co., Ltd.), Feb. 8, 1985-abstract.
Derwent Publications, Ltd., London, GB, No. AN 93-009953 (Database WPI, Week 9302) and DE-A-41 37 427 (Hoechst AG), Jan. 14, 1993-abstract.
Derwent Publications, Ltd., London, GB, No. AN 93-380412 (Database WPI, Week 9348) and JP-A-5 282 702 (Kuraray Co.), Oct. 29, 1993-abstract.

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