Magnetic recording medium with a specific relative speed to a magnetic head
AssigneeFuji Photo Film Co., Ltd.
InventorsNobuo Yamazaki, Shinji Saito
Life of this patent
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Abstract
A floppy disk-shaped magnetic recording medium of high recording density comprises a non-magnetic support provided on each side thereof sequentially with a substantially non-magnetic lower layer and a magnetic layer containing a ferromagnetic powder dispersed in a binder, and is used under a condition that a velocity of the medium relative to a magnetic head is at least 14 m/sec: wherein the non-magnetic lower layer has a thickness adjusted to be from five to twenty times as great as a maximum height of projections on the non-magnetic support surface, thereby achieving reduction in error rate increase.
Claims8
A floppy disk-shaped magnetic recording medium, which comprises:
- a non-magnetic support having projections on the surface thereof;
- a substantially non-magnetic lower layer including carbon black in an amount of less than 40 weight % of the substantially non-magnetic lower layer;
- and
- a magnetic layer containing a ferromagnetic powder dispersed in a binder, in this order, wherein:
- the non-magnetic lower layer and the magnetic layer are provided on each side of the non-magnetic support,
- the magnetic recording medium is configured and arranged for use under a condition that a velocity of the magnetic recording medium relative to a magnetic head is at least 14 m/sec and data can be read from the magnetic recording medium, and
- the non-magnetic lower layer has a thickness from five to twenty times as great as a maximum height of the projections on the surface of the non-magnetic support.
Dependencies are inferred from the claim text.