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US 5,945,189 AGranted
Magnetic recording medium including mica substrate
AssigneeNEC Corporation
InventorMasahiro Yanagisawa
Life of this patent
Estimating the term…
Abstract
In a magnetic recording medium, a substrate is made of mica having a cleavage surface, and a magnetic recording layer is formed on the cleavage surface.
Claims12
A magnetic recording medium comprising:
- a substrate made of mica having a cleavage surface, said mica being made of a compound formed by a plurality of layers made of oxygen, silicon, hydroxyl group and aluminum, said layers being combined by potassium ions, sodium ions or calcium ions;
- and
- a magnetic recording layer formed on the cleavage surface.
A magnetic recording medium comprising:
- a substrate made of mica having first and second cleavage surfaces, said mica being made of a compound formed by a plurality of layers made of oxygen, silicon, hydroxyl group and aluminum, said layers being combined by potassium ions, sodium ions or calcium ions;
- a first magnetic recording layer formed on said first cleavage surface;
- and
- a second magnetic recording layer formed on said second cleavage surface.
1 more element
A magnetic recording medium comprising:
- a base having first and second surfaces;
- a first substrate made of mica formed on the first surface of said base and having a first cleavage surface, said mica being made of a compound formed by a plurality of layers made of oxygen, silicon, hydroxyl group and aluminum, said layers being combined by potassium ions, sodium ions or calcium ions;
- a second substrate made of mica formed on the second surface of said base and having a second cleavage surface;
- a first magnetic recording layer formed on said first cleavage surface;
- and
- a second magnetic recording layer formed on said second cleavage surface.
3 more elements
Dependencies are inferred from the claim text.