Magnetic disc

Details Magnetic disc Magnetic disc

1994-08-31

1996-08-27

Thibodeau, Paul J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 654, 428 655, 428141, 428694T, 428694TR, 428694TS, 428694TP, 428694ST, 428694SG, B32B 302, G11B 566, G11B 570

Patent

active

055499546

ABSTRACT:
A magnetic disc having one or multiple undercoat layers, a continuous thin film magnetic layer or continuous thin film multiple magnetic layers, a protective layer and a lubricant layer sequentially laminated on a non-magnetic disc substrate, which has surface roughness on the surface of the magnetic disc, said surface roughness being such that when the surface roughness is measured by an atomic force microscope or a scanning tunnel microscope, the maximum peak height is from 150 .ANG. to 800 .ANG. based on the height giving the highest frequency in the height distribution of the surface roughness, and the depth (D.sub.0.5) at a bearing ratio of 0.5% from the highest point is from 80 .ANG. to 450 .ANG..

REFERENCES:
patent: 4619869 (1986-10-01), Kiriyama et al.
patent: 4833001 (1989-05-01), Kijima et al.
patent: 4910068 (1990-03-01), Takagi et al.
patent: 4997696 (1991-03-01), Kamada et al.
patent: 5119258 (1992-06-01), Tsai et al.
patent: 5202810 (1993-04-01), Nakamura et al.

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