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US 5,496,606 AGranted
Magnetic recording medium
AssigneeVictor Company of Japan, Ltd.
InventorMakoto Mizukami
Life of this patent
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Abstract
A magnetic recording medium comprising: a precoat layer formed on a circular glass substrate to which a texturing treatment is applied in a circumferential direction; and an undercoat film and a magnetic film formed in order on said precoat layer, whereby an axis of easy magnetization is formed so as to become a circumferential direction of a medium.
Claims1
A magnetic recording medium comprising:
- a circular glass substrate;
- a textured surface on one side of said glass substrate, said textured surface comprising fine scratches extending circumferentially on said one side of said substrate so that said textured surface has a surface roughness Ra of substantially 10-100 .ANG.;
- a precoat layer on said textured surface, said precoat layer having a thickness in a range of 20 .ANG. to 1 .mu.m and comprised of a material selected from the group consisting of Zr, W, V, Mo, WC and C;
- an undercoat film on said precoat layer;
- and
- a magnetic film on said undercoat film, so that a magnetic anisotropy in a circumferential direction is formed and an axis of easy magnetization on said magnetic recording medium extends in a circumferential direction.
3 more elements
Dependencies are inferred from the claim text.