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US 6,187,431 B1Granted
Magnetic recording medium
AssigneeRicoh Company, Ltd.
InventorTadao Katsuragawa
Life of this patent
Estimating the term…
Abstract
A magnetic recording medium has a transparent substrate with a plurality of grooves which extend parallel with each other at regular intervals, each of the grooves having inner side walls perpendicular to the transparent substrate and a space between adjacent side walls being constant, a magnetic material layer extending in the form of a stripe, provided on the surface of the inner side walls of each of the grooves, and a pair of dielectric multi-layers which are disposed so as to sandwich the transparent substrate therebetween.
Claims19
A magnetic recording medium comprising:
- a transparent substrate with a surface and a plurality of grooves which extend parallel with each other at regular intervals, each of said grooves having inner side walls perpendicular to said transparent substrate surface and a space between adjacent side walls being constant,
- a magnetic material layer extending in the form of a stripe, provided on the surface of said inner side walls of each of said grooves, and
- a pair of dielectric multi-layers which are disposed so as to sandwich said transparent substrate therebetween.
A magnetic recording medium comprising:
- a substrate with opposite surfaces and a plurality of grooves which extend parallel with each other at regular intervals, each of said grooves having inner side walls perpendicular to a substrate surface and a space between adjacent side walls being constant,
- a magnetic material layer extending in the form of a stripe, provided on the surface of said inner side walls of each of said grooves,
- a dielectric multi-layer which is provided on one surface of said substrate,
- a polarizing layer which is provided on said dielectric multi-layer, and
- a light reflection layer which is provided on the other surface of said substrate, opposite to said dielectric multi-layer with respect to said substrate.
2 more elements
Dependencies are inferred from the claim text.