Magnetic disk
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsKouichi Nakamura, Hirotsugu Kodama, Kyoji Noda
Life of this patent
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Abstract
A magnetic disk includes two kinds of texture lines formed on a substrate rendered to texturing, one kind being formed over the entire substrate and parallel with a circumference of the substrate and the other kind being formed such that a line tangent to the other texture intersects a line tangent to the one texture at an angle of 3 to 9 degrees. The other texture lines are yielded by processing the substrate with a polishing tape rocking the substrate radially thereof, and satisfying the floating characteristic of a magnetic head as being floated in a low degree, the contact-start-stop characteristic, and the attraction characteristic.
Claims3
A magnetic disk comprising:
- a substrate including two kinds of textures formed on a surface thereof, and
- at least a magnetic thin film laminated on the surface of said substrate for storing information,
- one of said two kinds of textures being formed over the entire surface of said substrate and parallel with a circumference of the substrate,
- the other of said two kinds of textures being formed on the same surface of said substrate such that a line tangent to the other texture intersects a line tangent to the one texture at an angle of 3 to 9 degrees, and
- the ratio of the other textures to the total textures ranging from 5 to 50%.
A magnetic disk comprising:
- a substrate,
- at least an intermediate layer provided on said substrate, and
- at least a magnetic thin film formed on said intermediate layer,
- said intermediate layer including two kinds of textures formed on a surface thereof, one of said two kinds of textures being formed over the entire surface of the intermediate layer and parallel with a circumference of said intermediate layer, the other of said two textures being formed such that a line tangent to the other texture intersects a line tangent to the one texture at an angle of 3 to 9 degrees, and the ratio of the other textures to the total textures ranging from 5 to 50%.
A magnetic disk comprising:
- an aluminum substrate,
- an Ni-P intermediate layer formed on said substrate,
- a Cr primary coat film formed on said intermediate layer,
- a magnetic thin film composed of a Co ferromagnetic material formed on said primary coat film for recording information thereon,
- a carbon protective film formed on said magnetic thin film for protecting said magnetic thin film, and
- a lubricating film formed on said carbon protective film,
- said intermediate layer including two kinds of textures formed on a surface thereof, one of said two kinds of textures being formed over the entire surface of the intermediate layer and parallel with a circumference of said intermediate layer, the other of said two kinds of textures being formed such that a line tangent to the other texture intersects a line tangent to the one texture at an angle of 3 to 9 degrees, and the ratio of the other textures to the total textures ranging from 5 to 50%.
Dependencies are inferred from the claim text.