Back to results
US 2003/0157374 A1Published application
Magnetic recording medium, and method for producing and inspecting the same
AssigneeShowa Denko K.K.
InventorsJunya Kato, Mikio Suzuki
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeShowa Denko K.K.
InventorsJunya Kato, Mikio Suzuki
Estimating the term…
The present invention provides a method for inspecting deposition characteristics of a deposit on the surface of a protective film predominantly containing carbon of a magnetic recording medium, which medium includes a disk and the protective film formed on the disk, the disk including a non-magnetic substrate, a non-magnetic undercoat layer, and a magnetic layer, the layers being formed on the substrate, wherein the method includes comparing a predetermined threshold with the extraction amount of an inspection gas component and/or a compound component formed so as to contain the inspection gas component, the gas component and/or the compound component being extracted with an inspection solvent after the magnetic recording medium is allowed to stand in an atmosphere of the inspection gas component; a process for producing a magnetic recording medium in which the extraction amount is equal to or greater than the threshold, the extraction amount being obtained through the inspection method; and a magnetic recording medium produced through the production process.
A method for inspecting deposition characteristics of a deposit on the surface of a protective film predominantly containing carbon of a magnetic recording medium, which medium comprises a disk and the protective film formed on the disk, the disk comprising a non-magnetic substrate, a non-magnetic undercoat layer, and a magnetic layer, the layers being formed on the substrate, characterized in that the method comprises determining that the extraction amount of an inspection gas component and/or a compound component formed so as to contain the inspection gas component is equal to or greater than a predetermined threshold, the gas component and/or the compound component being extracted with an inspection solvent after the magnetic recording medium is allowed to stand in an atmosphere of the inspection gas component.
A magnetic recording medium comprising a non-magnetic substrate;
A process for producing a magnetic recording medium, which process comprises forming a protective film predominantly containing carbon on a disk comprising a non-magnetic substrate, a non-magnetic undercoat layer, and a magnetic layer, the layers being formed on the substrate, characterized in that the protective film is formed such that the extraction amount of an inspection gas component and/or a compound component formed so as to contain the inspection gas component is equal to or greater than a predetermined threshold, the gas component and/or the compound component being extracted with an inspection solvent after the magnetic recording medium is allowed to stand in an atmosphere of the inspection gas component.
Dependencies are inferred from the claim text.