Magnetic recording medium having a glass substrate and method of

Details Magnetic recording medium having a glass substrate and method of Magnetic recording medium having a glass substrate and method of

1997-09-30

2000-08-01

Resan, Stevan A.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

428 653, 428 667, 428694ST, 428694SG, 428900, G11B 582

Patent

active

060964057

ABSTRACT:
In a glass substrate for use in a magnetic recording medium, the glass substrate has a pair of principal surfaces opposite to each other and a peripheral side area contiguous to the principal surfaces. The peripheral side area has a side end wall and intermediate regions between the side end wall and the principal surfaces. In this case, at least one of the intermediate regions and the side end wall is formed by a mirror finished surface which has a surface roughness Ra not greater than 1 .mu.m or a surface roughness Rmax not greater than 4 .mu.m. With this structure, no particles are generated from the peripheral side area because the side end surface of the glass substrate is mirror finished. Consequently, reproduction is performed without reproduction errors because of no generation of a thermal asperity and a head crash can be sufficiently avoided because of no projections which might result from the particles.

REFERENCES:
patent: 5080948 (1992-01-01), Morita et al.
patent: 5128922 (1992-07-01), Inui et al.
patent: 5341606 (1994-08-01), Hirabayashi
patent: 5470694 (1995-11-01), Ohta et al.

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