Magnetic recording medium
AssigneeSony Corporation
InventorFutoshi Sasaki
Life of this patent
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Abstract
When it is assumed that A is an area value of an absorption spectrum of a wavelength 2940 cm−1 to 2800 cm−1 when the magnetic layer surface is measured by the attenuated total reflectance measurement method using the Fourier transform infrared spectroscopy and B is an area value of an absorption spectrum of a wavelength 2940 cm−1 to 2800 cm−1 when the magnetic layer surface without the lubricant layer is measured by the attenuated total reflectance measurement method using the Fourier transform infrared spectroscopy, a value (A−B) is in a range not less than 0.01 and not greater than 0.30. This enables to accurately evaluate a lubricant amount on the magnetic layer surface and to simultaneously obtain an excellent running durability and an excellent electro-magnetic conversion characteristic.
Claims2
A magnetic recording medium including a non-magnetic support body having a magnetic layer formed by applying a magnetic paint prepared by kneading at least a binder and a magnetic powder and a lubricant layer formed on the magnetic layer surface,
- wherein a value (A−B) is in a range not less than 0.01 and not greater than 0.30 wherein A is an area value of an absorption spectrum of a wavelength 2940 cm−1 to 2800 cm−1 when the magnetic layer surface is measured by the attenuated total reflectance measurement method using the Fourier transform infrared spectroscopy and B is an area value of an absorption spectrum of a wavelength 2940 cm−1 to 2800 cm−1 when the magnetic layer surface without the lubricant layer is measured by the attenuated total reflectance measurement method using the Fourier transform infrared spectroscopy.
Dependencies are inferred from the claim text.