Substrate for magnetic recording medium, manufacturing method thereof, and magnetic recording medium
AssigneeFuji Electric Co., Ltd.
InventorTakashi Shimada
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Abstract
A slowly advancing tape-shaped matrix is pressed into contact with a surface of a rapidly rotating non-magnetic substrate for a magnetic recording medium. An abrasive slurry is added to the matrix. The area contact rate between the matrix and the surface, as well as the contact pressure per unit area between the matrix and the surface are regulated to both polish and slightly roughen the surface in a single process. In the case of a glass presubstrate, the glass is chemically strengthened before being surface-treated.
Claims20
A manufacturing process for a non-magnetic substrate for a magnetic recording medium comprising:
- pressing a running matrix of a surface-treating machine into contact with part of a side of a revolving presubstrate;
- adding an abrasive suspension to said matrix;
- and
- the step of pressing including a contact rates of 15 to 25 percent by area of said side and at a pressure of 20 to 150 g/cm2.
A manufacturing process of a non-magnetic substrate for a magnetic recording medium comprising the step of:
- pressing a running matrix of a surface-treating machine into contact with part of a side of a revolving presubstrate;
- adding an abrasive suspension to said matrix;
- the step of pressing including contacting said substrate at contact rates of from about 2 to about 15 percent by area of said side;
- and
- the step of pressing further including pressing with a pressures of from about 25 to about to 800 g/cm2.
Dependencies are inferred from the claim text.