Claims
- 1. 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.
- 2. An inspection method according to claim 1, wherein the inspection gas component is a gas generated in a magnetic recording and reproducing apparatus comprising a magnetic recording medium and a magnetic head for recording data onto the medium and reproducing the data therefrom.
- 3. An inspection method according to claim 1, wherein the inspection gas component is one or more selected from among a siloxane-containing gas, an acrylic-acid-containing gas, vaporized melamine, a vaporized lubricant, a vaporized higher fatty acid, a vaporized phthalic acid ester, and vaporized dioctyl phthalate.
- 4. An inspection method according to claim 1, wherein the inspection gas component is a gas component generated from a member employed inside the magnetic recording and reproducing apparatus.
- 5. An inspection method according to claim 1, wherein the inspection solvent is one or more selected from among methanol, ethanol, isopropyl alcohol, and water.
- 6. An inspection method according to claim 1, wherein the threshold is 0.06 [μg/100 cm2] when the extracted component is melamine.
- 7. A magnetic recording medium comprising a non-magnetic substrate; a non-magnetic undercoat layer and a magnetic layer, the layers being formed on the substrate; and a protective film predominantly containing carbon, the film being formed on the magnetic layer, characterized in 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.
- 8. A magnetic recording medium according to claim 7, wherein the threshold is 0.06 [μg/100 cm2] when the extracted component is melamine.
- 9. A magnetic recording medium according to claim 7, wherein a peak of the infrared spectrum of the surface of the protective film predominantly containing carbon, the peak corresponding to a carbon-hydrogen bond, has an intensity of 0.055 or less.
- 10. A magnetic recording medium according to claim 7, wherein the ratio of nitrogen to carbon in the protective film predominantly containing carbon is 5-40 at %.
- 11. A magnetic recording medium according to claim 7, wherein Id/Ig of the surface of the protective film predominantly containing carbon is 3.5 or less.
- 12. 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.
- 13. A production process for a magnetic recording medium according to claim 12, wherein a formation process for the protective film predominantly containing carbon comprises a sputtering process in which the protective film is formed while bias is applied to the disk.
- 14. A production process for a magnetic recording medium according to claim 12, wherein a formation process for the protective film predominantly containing carbon comprises a plasma CVD process in which a reaction gas containing hydrocarbon is employed as a raw material.
- 15. A production process for a magnetic recording medium according to claim 12, wherein a formation process for the protective film predominantly containing carbon comprises a formation step including a plasma CVD process in which a reaction gas containing hydrocarbon is employed as a raw material, and a formation step including a sputtering process in which the protective film is formed while bias is applied to the disk.
- 16. A magnetic recording and reproducing apparatus comprising a magnetic recording medium and a magnetic head for recording data onto the medium and reproducing the data therefrom, characterized in that the magnetic recording medium is a magnetic recording medium as recited in any one of claims 7 through 11.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2000-231114 |
Jul 2000 |
JP |
|
Parent Case Info
[0001] This application claims benefit of earlier applications based on Patent Application No. 2000-231114 filed in Japan (Filed: Jul. 31,2000), and Provisional U.S. Patent Application No. 60/246595 (Filed: Nov. 8, 2000).
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/JP01/06580 |
7/31/2001 |
WO |
|