Magnetic recording medium and production of the same
First Claim
1. A magnetic recording medium comprising a substrate, a magnetic layer on the substrate and a protective layer which is formed directly on the magnetic layer, said protective layer comprising an amorphous carbonaceous layer consisting essentially of carbon, hydrogen and oxygen, in which an atomic ratio of carbon/hydrogen is in the range of 100/100 to 500/1 and an atomic ratio of carbon/oxygen is in the range of 100/100 to 1,000/1.
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Accused Products
Abstract
A magnetic recording medium which comprises a substrate, a magnetic layer on the substrate and a protective layer which is formed directly on the magnetic layer or on an undercoat layer formed on the magnetic layer, the protective layer comprising a carbonaceous material essentially consisting of carbon, hydrogen and oxygen, which has improved traveling properties and abrasion resistance.
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Citations
14 Claims
- 1. A magnetic recording medium comprising a substrate, a magnetic layer on the substrate and a protective layer which is formed directly on the magnetic layer, said protective layer comprising an amorphous carbonaceous layer consisting essentially of carbon, hydrogen and oxygen, in which an atomic ratio of carbon/hydrogen is in the range of 100/100 to 500/1 and an atomic ratio of carbon/oxygen is in the range of 100/100 to 1,000/1.
- 4. A magnetic recording medium comprising a substrate, a magnetic layer, a first protective layer made of a polymer comprising carbon, silicon and oxygen atoms formed on the magnetic layer and a second protective layer formed on the first protective layer and made of a carbonaceous material.
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6. A method for producing a magnetic recording medium which comprises a substrate, a magnetic layer, a first protective layer made of a polymer comprising carbon, silicon and oxygen atoms formed on the magnetic layer and a second protective layer formed on the first protective layer and made of a carbonaceous material, which method comprises steps of
forming a magnetic layer on a substrate, plasma polymerizing an organic compound comprising carbon, silicon and oxygen atoms to form a first protective layer made of a polymer comprising carbon, silicon and oxygen atoms on the magnetic layer, and forming a carbonaceous second protective layer on the first protective layer.
- 8. A magnetic recording medium comprising a substrate, a magnetic layer on the substrate, an undercoat layer formed on the magnetic layer and a protective layer formed on the undercoat layer, wherein the protective layer comprises an amorphous carbonaceous layer consisting essentially of carbon, hydrogen and oxygen, in which an atomic ratio of carbon/hydrogen is in the range of 100/100 to 500/1 and an atomic ratio of carbon/oxygen is in the range of 100/100 to 1,000/1.
Specification